Aki Toivonen

  • Phone+358505941587
19962020

Research output per year

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Research Output

2020

Analysis of mechanisms inducing corrosion cracking of irradiated austenitic steels and development of a model for prediction of crack initiation

Margolin, B., Sorokin, A., Pirogova, N., Toivonen, A., Sefta, F. & Pokor, C., Jan 2020, In : Engineering Failure Analysis. 107, 104235.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

International Round-Robin on Stress Corrosion Crack Initiation of Alloy 600 Material in Pressurized Water Reactor Primary Water

Meadows, P. J., Andresen, P. L., Toloczko, M. B., Kuang, W-J., Ritter, S., Burman, M., Zhang, L., Ernestova, M., Toivonen, A., Perosanz-Lopez, F., Stairmand, J. W. & Mottershead, K. J., Aug 2020, In : Corrosion. 76, 8, p. 719-733

Research output: Contribution to journalArticleScientificpeer-review

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

Steam Oxidation of Aluminide-Coated and Uncoated TP347HFG Stainless Steel under Atmospheric and Ultra-Supercritical Steam Conditions at 700 °C

Agüero, A., Baráibar, I., Gutiérrez, M., Tuurna, S., Toivonen, A., Penttilä, S. & Auerkari, P., 28 Aug 2020, In : Coatings. 10, 9, 20 p., 839.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
5 Downloads (Pure)

Stress corrosion crack initiation testing with tapered specimens in high-temperature water–results of a collaborative research project

Bosch, R. W., Ritter, S., Herbst, M., Kilian, R., Burke, M. G., Duff, J., Scenini, F., Gu, Y., Dinu, A., Ehrnstén, U., Toivonen, A., Novotny, R., Martin, O., Perosanz, F. J., Legat, A. & Zajec, B., 8 Sep 2020, In : Corrosion Engineering Science and Technology. 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2019

Effect of lead and applied potential on corrosion of carbon steel in steam generator crevice solutions

Bojinov, M., Jäppinen, E., Saario, T., Sipilä, K. & Toivonen, A., 1 Oct 2019, In : Corrosion Science. 159, 108117.

Research output: Contribution to journalArticleScientificpeer-review

2018
Open Access
1 Citation (Scopus)

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

Review of the Aaltonen-mechanism

Huotilainen, C., Saario, T. & Toivonen, A., Nov 2018, Svensk Kärnbränslehantering AB (SKB). 31 p. (SKB rapport; No. SKB R-18-03).

Research output: Book/ReportReport

Open Access
2017

EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam

Toivonen, A. & Hänninen, H., 2017.

Research output: Contribution to conferenceConference AbstractScientific

Environmentally assisted cracking crack initiation in nickel-based alloy dissimilar metal welds in doped and pure steam and pressurized water reactor water

Toivonen, A., Hänninen, H., Saukkonen, T. & Aaltonen, P., 1 Jul 2017, In : Corrosion. 73, 7, p. 808-821 14 p.

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Materials and Water Chemistry for Supercritical Water-cooled Reactors

Guzonas, D., Novotny, R., Penttilä, S., Toivonen, A. & Zheng, W., 31 Oct 2017, Woodhead Publishing. 278 p.

Research output: Book/ReportBook (author)

1 Citation (Scopus)

Safety of new reactor technologies (GENXFIN)

Penttilä, S., Kolehmainen, J., Toivonen, A., Jäppinen, T., Nevasmaa, P., Tulkki, V., Rantakaulio, A. & Niemi, M., 2017, SAFIR2018 - The Finnish Research Programme on Nuclear Power Plant Safety 2015-2018: Interim Report. VTT Technical Research Centre of Finland, p. 135-142 (VTT Technology, Vol. 294).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Open Access

Thermal ageing and EAC research for plant life management (THELMA)

Ehrnstén, U., Ahonen, M., Autio, J-M., Ivanchenko, M., Hurley, C., Toivonen, A., Mouginot, R., Ilola, R. & Hänninen, H., 2017, SAFIR2018 - The Finnish Research Programme on Nuclear Power Plant Safety 2015-2018: Interim Report. VTT Technical Research Centre of Finland, p. 319-330 (VTT Technology, Vol. 294).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Open Access
2016

ATF cladding testing capacity development at VTT

Toivonen, A., Penttilä, S., Huotilainen, S. & Peltonen, S., 2016, VTT Technical Research Centre of Finland. 12 p. (VTT Research Report, Vol. VTT-R-00783-16).

Research output: Book/ReportReport

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)

European project "supercritical water reactor-fuel qualification test": Summary of general corrosion tests

Novotný, R., Janík, P., Toivonen, A., Ruiz, A., Szaraz, Z., Zhang, L., Siegl, J., Haušild, P., Penttilä, S. & Macák, J., 1 Jul 2016, In : Journal of Nuclear Engineering and Radiation Science. 2, 3, 031007.

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

European Project "Supercritical Water Reactor-Fuel Qualification Test": Overview, Results, Lessons Learned, and Future Outlook

Ruzickova, M., Vojacek, A., Schulenberg, T., Visser, D. C., Novotny, R., Kiss, A., Maraczy, C. & Toivonen, A., 2016, In : Journal of Nuclear Engineering and Radiation Science. 2, 1, 10 p., 011002.

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (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

Oxidation parameters of oxide dispersion-strengthened steels in supercritical water

Penttilä, S., Betova, I., Bojinov, M., Kinnunen, P. & Toivonen, A., 2016, In : Journal of Nuclear Engineering and Radiation Science. 2, 1, 8 p., 011017.

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

SAFIR 2018 GENXFIN 2016: Review report on SMR material issues

Toivonen, A., Penttilä, S., Jäppinen, T. & Nevasmaa, P., 2016, VTT Technical Research Centre of Finland. 14 p. (VTT Research Report, Vol. VTT-R-05779-16).

Research output: Book/ReportReport

SAFIR 2018 THELMA 2016: ICGEAC Inconel 600 Round Robin progress at VTT in 2016

Toivonen, A. & Autio, J-M., 2016, VTT Technical Research Centre of Finland. 17 p. (VTT Research Report, Vol. VTT-R-05170-16).

Research output: Book/ReportReport

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

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, In : Corrosion Science. 100, p. 36-46

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

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
2014

Overview and progress in the European project: "Supercritical Water Reactor - Fuel Qualification Test"

Ruzickova, M., Schulenberg, T., Visser, D. C., Novotny, R., Kiss, A., Maraczy, C. & Toivonen, A., 2014, In : Progress in Nuclear Energy. 77, p. 381-389 8 p.

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Structural integrity of Ni-base alloy welds

Hänninen, H., Brederholm, A., Sarikka, T., Mouginot, R., Holmström, P., Saukkonen, T., Toivonen, A., Karjalainen-Roikonen, P., Nevasmaa, P., Keinänen, H., Leskelä, E., Ahonen, M., Ehrnsten, U. & Aaltonen, P., 2014, Espoo: VTT Technical Research Centre of Finland. 264 p. (VTT Technology, Vol. 175).

Research output: Book/ReportReport

Open Access
2013

BWR SCC test acceleration by testing in SCW

Toivonen, A., 2013, VTT Technical Research Centre of Finland. 37 p. (VTT Research Report; No. VTT-R-07971-13).

Research output: Book/ReportReport

Effect of surface modification on the corrosion resistance of austenitic stainless steel 316L in supercritical water conditions

Penttilä, S., Toivonen, A., Li, J., Zheng, W. & Novotny, R., 2013, In : Journal of Supercritical Fluids. 81, p. 157-163 6 p.

Research output: Contribution to journalArticleScientificpeer-review

50 Citations (Scopus)

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

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 - Abstracts. Auerkari, P. & Veivo, J. (eds.). Espoo: VTT Technical Research Centre of Finland, p. 28 (VTT Technology; No. 107).

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

Open Access

Investigation of coatings, applied by PVD, for the corrosion protection of materials in supercritical water

Van Nieuwenhove, R., Balak, J., Toivonen, A., Penttilä, S. & Ehrnstén, U., 2013. 12 p.

Research output: Contribution to conferenceConference articleScientific

Oxidation and SCC behaviour of austenitic and ODS steels in supercritical water

Penttilä, S. & Toivonen, A., 2013. 14 p.

Research output: Contribution to conferenceConference articleScientific

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)

Materials Studies in Academy of Finland Project New Type Nuclear Reactors (NETNUC)

Penttilä, S., Toivonen, A. & Rissanen, L., 2012, New Type Nuclear Reactors (NETNUC) 2008-2011: Final Report. Suikkanen, H. (ed.). Lappeenranta: Lappeenranta University of Technology, p. 103-116 (Lappeenranta University of Technology: Energy. Research report; No. 23).

Research output: Chapter in Book/Report/Conference proceedingOther book partProfessional

Open Access
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

Environment-assisted cracking and hot cracking susceptibility of nickel-base alloy weld metals

Hänninen, H., Brederholm, A., Saukkonen, T., Ivanchenko, M., Toivonen, A., Karlsen, W., Ehrnstén, U. & Aaltonen, P., 2011, Espoo: VTT Technical Research Centre of Finland. 157 p. (VTT Tiedotteita - Research Notes; No. 2582).

Research output: Book/ReportReport

Open Access
2 Citations (Scopus)

Estimation of kinetic parameters of the corrosion layer constituents on steels in supercritical water coolant conditions

Penttilä, S., Betova, I., Bojinov, M., Kinnunen, P. & Toivonen, A., 2011, In : Corrosion Science. 53, 12, p. 4193-4203 11 p.

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

European supercritical water cooled reactor

Schulenberg, T., Starflinger, J., Marsault, P., Bittermann, D., Maráczy, C., Laurien, E., Lycklama à Nijeholt, J. A., Anglart, H., Andreani, M., Ruzickova, M. & Toivonen, A., 2011, In : Nuclear Engineering and Design. 241, 9, p. 3505-3513 9 p.

Research output: Contribution to journalArticleScientificpeer-review

56 Citations (Scopus)

High Cr ODS steels performance under supercritical water environment

Novotny, R., Penttilä, S., Janik, P., Hähner, P. & Toivonen, A., 2011.

Research output: Contribution to conferenceConference articleScientificpeer-review

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