Ulla Ehrnstén

Principle Scientist

  • Phone+358405354057
1989 …2020

Research output per year

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Research Output

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Article
2020

Effect of thermal ageing at 400 °C on the microstructure of ferrite-austenite interface of nickel-base alloy narrow-gap dissimilar metal weld

Ahonen, M., Mouginot, R., Sarikka, T., Lindqvist, S., Que, Z., Ehrnstén, U., Virkkunen, I. & Hänninen, H., Mar 2020, In : Metals. 10, 3, 421.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

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

Electrochemical investigation of in-service thermal aging in two CF8M cast stainless steels

Huotilainen, C., Ivanchenko, M., Efsing, P. & Ehrnsten, U., Jul 2019, In : Journal of Nuclear Materials. 520, p. 34-40 7 p.

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Nanoindentation study of short-range ordering

Mouginot, R., Sarikka, T., Ehrnstén, U. & Hänninen, H., 25 Jan 2019, In : Materials Research Express. 6, 4, 8 p., 045052.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
1 Citation (Scopus)
2017

Effect of mechanical mismatch on fracture mechanical behavior of SA 508 - Alloy 52 narrow gap dissimilar metal weld

Sarikka, T., Ahonen, M., Mouginot, R., Nevasmaa, P., Karjalainen-Roikonen, P., Ehrnstén, U. & Hänninen, H., 1 Nov 2017, In : International Journal of Pressure Vessels and Piping. 157, p. 30-42 13 p.

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

On flux effects in a low alloy steel from a Swedish reactor pressure vessel

Boåsen, M., Efsing, P. & Ehrnstén, U., 2017, In : Journal of Nuclear Materials. 484, p. 110-119 10 p.

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Thermal ageing and short-range ordering of Alloy 690 between 350 and 550 °C

Mouginot, R., Sarikka, T., Heikkilä, M., Ivanchenko, M., Ehrnstén, U., Kim, Y. S., Kimsung, S. & Hänninen, H., 1 Mar 2017, In : Journal of Nuclear Materials. 485, p. 56-66 11 p.

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)
2016

Microstructural, mechanical, and fracture mechanical characterization of SA 508-Alloy 182 dissimilar metal weld in view of mismatch state

Sarikka, T., Ahonen, M., Mouginot, R., Nevasmaa, P., Karjalainen-Roikonen, P., Ehrnsten, U. & Hänninen, H., 2016, In : International Journal of Pressure Vessels and Piping. 145, p. 13-22

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Multiaxial creep testing device for nuclear fuel claddings

Pohja, R., Moilanen, P., Rantala, J., Huotilainen, S., Tulkki, V., Ehrnstén, U. & Holmström, S., 2016, In : Athens Journal of Sciences. 3, 3, p. 227-240

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2014

Investigations of a Type 316L Steam Dryer Plate Material Suffering from IGSCC After a Few Years in BWR Conditions

Autio, J-M., Ehrnstén, U., Mouginot, R., Pakarinen, J. & Cocco, M., 2014, In : Microscopy and Microanalysis. 20, S3, p. 1870-1871

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
2013

Investigations on core basket bolts from a VVER 440 power plant

Ehrnsten, U., Pakarinen, J., Karlsen, W. & Keinänen, H., 2013, In : Engineering Failure Analysis. 33, p. 55-65 11 p.

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
2009

Microstructural manifestation of dynamic strain aging in AISI 316 stainless steel

Karlsen, W., Ivanchenko, M., Ehrnstén, U., Yagodzinskyy, Y. & Hänninen, H., 2009, In : Journal of Nuclear Materials. 395, 1-3, p. 156-161 6 p.

Research output: Contribution to journalArticleScientificpeer-review

52 Citations (Scopus)
2007

Characteristics relevant to ductile failure of bimetallic welds and evaluation of transferability of fracture properties

Laukkanen, A., Nevasmaa, P., Ehrnstén, U. & Rintamaa, R., 2007, In : Nuclear Engineering and Design. 237, 1, p. 1-15

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)
2004

Dependence of re-embrittlement rate after annealing on the copper, nickel and phosphorus contents in model alloys

Valo, M., Ehrnstén, U., Kohopää, J., Debarberis, L., Krykukov, A. & Rintamaa, R., 2004, In : Journal of ASTM International. 1, 4, p. 164 - 178 15 p.

Research output: Contribution to journalArticleScientificpeer-review

2002

Elektronimikroskopia - oiva tekniikka metallitutkimuksessa

Varis, P., Ehrnsten, U. & Nenonen, P., 2002, In : Kunnossapito. 3, p. 58-60

Research output: Contribution to journalArticleProfessional

2001
1997

Improvement of a-C:H film adhesion by intermediate layers and sputter cleaning procedures on stainless steel, alumina and cemented carbide

Ronkainen, H., Vihersalo, J., Varjus, S., Zilliacus, R., Ehrnsten, U. & Nenonen, P., 1997, In : Surface and Coatings Technology. 90, 3, p. 190 - 196 7 p.

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)
1996

Studying localized corrosion in stainless steels with surface-sensitive methods

Ehrnsten, U., Likonen, J., Carpen, L. & Varjonen, O., 1996, In : Materials Characterization. 36, 4-5, p. 279-289

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
1994

Mechanical and corrosion properties of super Duplex stainless steel weldments

Vilpas, M., Ruusila, J. & Ehrnsten, U., 1994, In : International Journal for the Joining of Materials. 6, 1, p. 39-43

Research output: Contribution to journalArticleScientific

3 Citations (Scopus)
1993

Cyclic crack growth evaluation of a 20MnMoNi55 piping steel in high-oxygen reactor water

Aaltonen, P., Rintamaa, R., Hänninen, H., Ehrnsten, U. & Arilahti, E., 1993, In : Nuclear Engineering and Design. 144, 1, p. 111 - 122 12 p.

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Porosity of thin diamond-like carbon films deposited by an arc discharge method

Koskinen, J., Ehrnsten, U., Mahiout, A., Lahtinen, R., Hirvonen, J-P. & Hannula, S-P., 1993, In : Surface and Coatings Technology. 62, 1-3, p. 356 - 360 5 p.

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)
1992

Investigation on the origin and nature of the microstructural features related to corrosion initiation in titanium-aluminium nitride coated steel

Ronkainen, H., Ehrnsten, U., Zilliacus, R., Saarilahti, J., Mahiout, A. & Hannula, S-P., 1992, In : Thin Solid Films. 220, 1-2, p. 160-165 6 p.

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Static and cyclic crack growth of low alloy steels in high-oxygen water simulating HDR test conditions

Hänninen, H., Aaltonen, P., Rintamaa, R., Arilahti, E. & Ehrnsten, U., 1992, In : Nuclear Engineering and Design. 137, 3, p. 291-304 14 p.

Research output: Contribution to journalArticleScientificpeer-review