Aki Toivonen

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19962020

Research output per year

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Research Output

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Conference article in proceedings
2020

Round robin exercise of the candidate ATF cladding materials within the IAEA ACTOF project

Ševeček, M., Krejčí, J., Chalupová, A., Kabátová, J., Manoch, F., Kočí, J., Cvrček, L., Tang, C., Steinbrűck, M., Grosse, M., Penttilä, S., Autio, J. M., Lydman, J., Toivonen, A., Sartowska, B., Starosta, W., Waliś, L., Hózer, Z., Novotny, T., Perezné-Feró, E. & 5 others, Csordás, A. P., Horváth, M., Szabó, P., Giovedi, C. & Xu, P., 2020, Global/Top Fuel 2019. American Nuclear Society ANS, p. 283-290 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2018

Overview of oxidation tests results of austenitic alloys coated by CrN and NiCrAlY in high temperature steam environments

Penttilä, S., Toivonen, A., Peltonen, S. & Huang, X., 31 Dec 2018, Proceedings of 1st International Conference on Generation IV and Small Reactors. Rouben, B. (ed.). p. 1-12 12 p. 51

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2016

Effect of Shot Peening on Oxidation Resistance of Austenitic Alloys in Supercritical Water Conditions

Penttilä, S., Toivonen, A., Auerkari, P. & Metsäjoki, J., 2016, International Congress on Advances in Nuclear Power Plants (ICAPP 2016) . American Nuclear Society ANS, Vol. 2. p. 922-929

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Overview of SCWR candidate materials stress corrosion tests

Toivonen, A. & Penttilä, S., 2016, Baltica X: International Conference on Life Management and Maintenance for Power Plants. Auerkari, P. (ed.). Espoo: VTT Technical Research Centre of Finland, 15 p. (VTT Technology, Vol. 261).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
2015

Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water

Gong, M., Zhou, Z., Hu, H., Penttilä, S. & Toivonen, A., 2015, Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland, 9 p. 2059. (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

European Project "Supercritical Water Reactor: Fuel Qualification Test" (SCWR-FQT): Results of SCC susceptibility tests

Novotny, R., Janík, P., Toivonen, A., Ruiz, A., Szaraz, Z., Siegl, J., Hausild, P. & Penttilä, S., 2015, Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). USB stick ed. VTT Technical Research Centre of Finland, 15 p. 2078. (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

European Project "Supercritical Water Reactor - Fuel Qualification Test" (SCWR-FQT): Overview, Results, Lessons Learnt and Future Outlook

Ruzickova, M., Vojacek, A., Schulenberg, T., Visser, D., Novotny, R., Kiss, A., Maraczy, C. & Toivonen, A., 2015, Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland, 17 p. 1092. (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

Oxidation model for construction materials in supercritical water: estimation of kinetic and transport parameters

Penttilä, S., Betova, I., Bojinov, M., Kinnunen, P. & Toivonen, A., 2015, Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). USB stick ed. VTT Technical Research Centre of Finland, 13 p. 2064. (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

SCC tests in SCW at 550°C on two heats of 316L

Toivonen, A., Penttilä, S. & Novotny, R., 2015, Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015). VTT Technical Research Centre of Finland, 10 p. 2005. (VTT Technology; No. 216).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access
2013

General corrosion and SCC tests on ODS steels in supercritical water

Toivonen, A. & Penttilä, S., 2013, Baltica IX. International Conference on Life Management and Maintenance for Power Plants. Auerkari, P. & Veivo, J. (eds.). Espoo: VTT Technical Research Centre of Finland, p. 174-193 (VTT Technology; No. 106).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
2012

Characterization of high performance austenitic and ODS alloys for SCWR conditions

Penttilä, S., Toivonen, A., Auerkari, P. & Novotny, R., 2012, Proceedings of the 2012 International Congress on Advances in Nuclear Power Plants, ICAPP 2012. American Nuclear Society ANS, p. 2563-2575

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)
2011

Corrosion and creep studies of candidate in-core materials for Generation IV supercritical water reactor

Penttilä, S., Rissanen, L., Saario, T. & Toivonen, A., 2011, Proceedings: 2nd International Conference on Advances in Nuclear Materials, ANM 2011. Mumbai, India

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Deformation microstructures of 30 dpa AISI 304 stainless steel after monotonic tensile and constant load autoclave testing

Karlsen, W., Pakarinen, J., Toivonen, A. & Ehrnstén, U., 2011, 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors. Busby, J. T., Ilevbare, G. & Andresen, P. L. (eds.). Wiley, p. 1352-1366

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

7 Citations (Scopus)

Effect of coating and surface modification on the corrosion resistance of selected alloys in supercritical water

Jian, L., Zheng, W., Cook, W., Toivonen, A., Penttilä, S., Guzonas, D., Woo, O. T., Liu, P. & Bibby, D., 2011, Proceedings : 32nd Annual CNS Conference. Ontario, Canada, p. 872-878

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

4 Citations (Scopus)

Effect of Hot Cracks on EAC Crack initiation and Growth in Nickel-Base Alloy Weld Metals

Hänninen, H., Toivonen, A., Brederholm, A., Saukkonen, T., Karlsen, W., Ehrnstén, U. & Aaltonen, P., 2011, Proceedings of the 15th international Conference on Environmental Degradation of Materials in Nuclear power Systems - Water reactors. Ilevbare, G., Busby, J. & Andersen, P. (eds.). Springer, p. 197-224 26 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Effect of surface modification on the corrosion resistivity in supercritical water

Penttilä, S., Horvath, A., Toivonen, A. & Zolnai, Z., 2011, Proceedings: 5th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-5. 17 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

2010

Candidate materials performance under Supercritical Water Reactor (SCWR) conditions

Toivonen, A., Penttilä, S. & Rissanen, L., 2010, Baltica VIII: Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland, Vol. 1. p. 351-371 (VTT Symposium; No. 264).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

Characterization of Candidate Materials in SCWR Conditions: Estimation of Kinetic Parameters of Individual Corrosion Layer Constituents

Penttilä, S., Betova, I., Bojinov, M., Kinnunen, P. & Toivonen, A., 2010, Proceedings of the International Congress on Advances in Nuclear Power Plants (ICAPP 2010), June 13-17, 2010, San Diego, California, USA: Embedded International Topical Meeting at the 2010 ANS Annual Meeting. American Nuclear Society ANS, Vol. 3. p. 2013-2023

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Corrosion products behavior and source term reduction: Guidelines and feedback for EDF PWRs, concerning the B/Li coordinations and steam generators replacement

Wintergerst, M., Taunier, S., De Bouvier, O., Pokor, C., Toivonen, A., Ranchoux, G., Bretelle, J-L. & Carrette, F., 2010, Nuclear Plant Chemistry Conference 2010 (NPC 2010) : International Conference on Water Chemistry of Nuclear Reactor Systems and 8th International Radiolysis, Electrochemistry and Materials Performance Workshop : Quebec City, Quebec, Canada, 3-7 October 2010. Toronto, 18 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Determination of the time to failure curve as a function of stress for a highly irradiated AISI 304 stainless steel after constant load tests in simulated PWR water environment

Pokor, C., Massoud, J-P., Wintergerst, M., Toivonen, A., Ehrnstén, U. & Karlsen, W., 2010, Fontevraud 7: Contribution of Materials Investigation to Improve the Safety and Performance of LWRs, Avignon, France, 26-30.9.2010. 18 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Environment-assisted cracking and hot cracking of Ni-base alloy dissimilar metal welds

Aaltonen, P., Hänninen, H., Brederholm, A., Toivonen, A. & Ehrnsten, U., 2010, Baltica VIII: Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland, Vol. 1. p. 384-400 (VTT Symposium; No. 264).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access

Oxidation performance of high temperature steels and coatings for future supercritical power plants

Auerkari, P., Salonen, J., Toivonen, A., Penttilä, S., Häkkilä, J., Aguero, A., Gutiérrez, M., Muelas, R. & Fry, T., 2010, Materials for advanced power engineering 2010: Proceedings of the 9th Liege Conference on Materials for Advanced Power Engineering, September 27-29th, 2010, Liège, Belgium. Lecomte-Beckers, J., Contrepois, Q., Beck, T. & Kuhn, B. (eds.). p. 1044-1051 (Schriften des Forschungszentrums Jülich: Reihe Energie & Umwelt/Energy & Environment, Vol. 94).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2009

EAC Crack Initiation in Ni-based Dissimilar metal Welds using Doped Steam Test

Hänninen, H., Toivonen, A., Saukkonen, T., Brederholm, A., Aaltonen, P. & Ehrnstén, U., 2009, Proceedings of the 14th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors. American Nuclear Society ANS, Vol. 1. p. 333-344

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Recent results of research on supercritical water-cooled reactors in Europe

Starflinger, J., Koehly, C., Schulenberg, T., Maraczy, C., Toivonen, A., Penttilä, S., Chandra, L., Lycklama, A. & Nijeholt, J. A., 2009, Proceedings: Canadian Nuclear Society - 30th Annual Canadian Nuclear Society Conference and 33rd CNS/CNA Student Conference 2009. Toronto, p. 1338-1349

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)
2008

Corrosion Studies of Candidate Materials for European HPLWR

Penttilä, S., Toivonen, A., Heikinheimo, L. & Novotny, R., 2008, Proceedings: International Conference on Advances in Nuclear Power Plants, ICAPP 2008. American Nuclear Society ANS, p. 2163-2174

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

7 Citations (Scopus)
2007

Environment-assisted cracking and hot cracking of Ni-base alloy dissimilar metal welds

Hänninen, H., Toivonen, A., Brederholm, A., Saukkonen, T., Ehrnstén, U. & Aaltonen, P., 2007, Proceedings: 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems, 2007. Vol. 2. p. 1161-1178

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

9 Citations (Scopus)

Generation IV material issues

Heikinheimo, L., Aaltonen, P. & Toivonen, A., 2007, BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 1. Espoo: VTT Technical Research Centre of Finland, p. 212-223 (VTT Symposium; No. 246).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access
2006

Post-irradiation SCC investigations on highly-irradiated core internals component materials

Toivonen, A., Aaltonen, P., Karlsen, W., Ehrnstén, U., Massoud, J-P. & Boursier, J-M., 2006, 6th International Symposium on Contribution of Materials Investigations to Improve the Safety and Performance of LWRs: Proceedings. Vol. 1. p. 567-579

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

SCC growth rate quantification in CW 316L stainless steel in PWR primary water using reduced size compact tension specimens

Duisabeau, L., Fournier, L., Toivonen, A. & Aaltonen, P., 2006, 6th International Symposium on Contribution of Materials Investigations to Improve the Safety and Performance of LWRs: Proceedings. Vol. 1. p. 137-145

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2005

Dynamic Strain Ageing And Eac Of Deformed Nitrogen-Alloyed AISI 316 Stainless Steels

Ehrnstén, U., Ivanchenko, M., Nevdacha, V., Yagozinskyy, Y., Toivonen, A. & Hänninen, H., 2005, 12th International Conference on Environmental Degradation of Materials in Nuclear Systems - Water Reactors. August 14-18, 2005, Snowbird Resort, Salt Lake City, Utah, USA. Minerals, Metals and Materials Society, TMS, p. 1475-1482

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
9 Citations (Scopus)

Fractographic observations on a highly irradiated AISI 304 steel after constant load tests in simulated PWR water and argon and after supplementary tensile and impact tests

Toivonen, A., Ehrnstén, U., Karlsen, W., Aaltonen, P., Massoud, J-P. & Boursier, J-M., 2005, Proceedings of the 12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors. Minerals, Metals and Materials Society, TMS, p. 327-336

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

11 Citations (Scopus)
2004

Comparison of the Electric Properties and ESCA Result of Oxide Films Formed on AISI 316L Steel in Simulated BWR Conditions during SSRT

Takeda, Y., Bojinov, M., Hänninen, H., Kinnunen, P., Laitinen, T., Mäkelä, K., Saario, T., Sakaguchi, K., Shoji, T., Sirkiä, P. & Toivonen, A., 2004, Advances in fracture and failure prevention. Trans Tech Publications, p. 925-930 (Key Engineering Materials, Vol. 261-263).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

7 Citations (Scopus)

Dynamic strain ageing of deformed nitrogen-alloyed AISI 316 stainless steels

Ehrnstén, U., Ivanchenko, M., Nevdacha, V., Yagozinskyy, Y., Toivonen, A. & Hänninen, H., 2004, Long term prediction & modelling of corrosion: Proceedings EUROCORR 2004. CEFRACOR, 10 p. (EFC Event; No. 266).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

4 Citations (Scopus)
2003

Effect of strain and strain rate on the electronic properties of the oxide film growing on an austenitic stainless steel in simulated BWR conditions

Takeda, Y., Bojinov, M., Hänninen, H., Kinnunen, P., Mäkelä, K., Saario, T., Sakaguchi, K., Shoji, T., Toivonen, A. & Sirkiä, P., 2003, The 47th Japan Congress on Materials Research.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Effect of strain on electric properties of oxide films growing on AISI 316L NG steel in simulated BWR conditions

Takeda, Y., Bojinov, M., Hänninen, H., Kinnunen, P., Laitinen, T., Mäkelä, K., Saario, T., Sakaguchi, K., Shoji, T., Sirkiä, P. & Toivonen, A., 2003, Eleventh International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors. American Nuclear Society ANS, 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Effects of water chemistry transients on crack growth rate of nickel-based weld metals

Toivonen, A., Moilanen, P., Aaltonen, P., Taivalaho, L. & Muttilainen, E., 2003, Plant Life Management: Progress for structural integrity. Espoo: VTT Technical Research Centre of Finland, p. 223-239 (VTT Symposium; No. 227).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access
2 Citations (Scopus)

Properties and IASCC susceptibility of austenitic stainless steel 08X18H10T

Toivonen, A., Aaltonen, P., Nenonen, P., Ehrnsten, U., Käki, A. & Hietanen, O., 2003, Plant Life Management: Progress for structural integrity. Espoo: VTT Technical Research Centre of Finland, p. 277-308 (VTT Symposium; No. 227).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Open Access
1 Citation (Scopus)
2002

Influence of sulphate ions on the composition and structure of the oxide films on stainless steel and nickel alloys in simulated BWR crack conditions

Bojinov, M., Campbell, J. M., Helin, M., Johansson, L-S., Kinnunen, P., Laitinen, T., Muttilainen, E., Mäkelä, K., Ollonqvist, T., Reinvall, A., Saario, T., Sirkiä, P., Toivonen, A. & Väyrynen, J., 2002, Proceedings Chimie 2002: International Conference Water Chemistry in Nuclear Reactor Systems. Operation Optimisation and New Developments. 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

2001

Effects of water chemistry transients on crack growth rate of nickel-based weld metals

Toivonen, A., Aaltonen, P., Taivalaho, L., Moilanen, P. & Muttilainen, E., 2001, Proceedings of the 10th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors. 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Evaluation of test techniques for stress corrosion cracking of dissimilar metal weldments

Tice, D., Toivonen, A., Rosborg, B., Atkinson, J. D., Dietzel, W., Swan, D., Lapena, J. & McAllister, S., 2001, Proceedings of the 10th International Conference on Environmental Degradation of Materials in Nuclear Power Systems Water Reactors. 10 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Irradiation assisted stress corrosion cracking of core components

Toivonen, A., Aaltonen, P., Nenonen, P., Ehrnsten, U., Käki, A., Valo, M., Kukkonen, A. & Hietanen, O., 2001, Plant Life Management: Midterm status of a R&D project. Espoo: VTT Technical Research Centre of Finland, p. 241-255 (VTT Symposium; No. 218).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
1 Citation (Scopus)

Protectiveness of oxide films in simulated BWR crack conditions, SO42- enrichment and cracking susceptibility

Bojinov, M., Laitinen, T., Mäkelä, K., Saario, T., Sirkiä, P. & Toivonen, A., 2001, Plant Life Management: Midterm status of a R&D project. Espoo: VTT Technical Research Centre of Finland, p. 169-178 (VTT Symposium; No. 218).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
2000

Correlations between the stability of oxide films in simulated BWR crack conditions, SO42 - enrichment and cracking susceptibility

Balachov, I., Bojinov, M., Laitinen, T., Muttilainen, E., Mäkelä, K., Reinvall, A., Saario, T., Sirkiä, P. & Toivonen, A., 2000, Water Chemistry of Nuclear Reactor Systems 8: proceedings of the international conference. London: Thomas Telford, Vol. 1. p. 170 - 172

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1998

Method development for studies of environmentally assisted cracking (EAC)

Karjalainen-Roikonen, P., Moilanen, P., Toivonen, A. & Aaltonen, P., 1998, RATU2: The Finnish Research Programme on the Structural Integrity of Nuclear Power Plants: Synthesis of achievements 1995-1998. Espoo: VTT Technical Research Centre of Finland, p. 105-124 (VTT Symposium; No. 190).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
1997

The feasibility of small size specimens for testing of environmentally assisted cracking of irradiated materials and of materials under irradiation in reactor core

Toivonen, A., Moilanen, P., Pyykkönen, M., Tähtinen, S., Rintamaa, R. & Saario, T., 1997, 23. MPA seminar: Safety and reliability of plant technology with special emphasis on nuclear technology. Stuttgart: Materials Testing Institute University of Stuttgart MPA, Vol. 1. 9 p. 17

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

1996

The use of small fracture mechanical specimens in research of environmentally assisted cracking in simulated light water reactor environments

Karjalainen-Roikonen, P., Toivonen, A. & Moilanen, P., 1996, Enlarged Halden Programme Group Meeting on High Burn-up Fuel Performance, Safety and Reliability and Degradation of In-Core Materials and Water Chemistry Effects and Man-Machine Systems Research. Halden, Vol. 2. 5 p. (OECD Halden Reactor Project; No. HPR-347).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific