Ulla Ehrnstén

Principle Scientist

1989 …2019
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Personal profile

Research interests

I am a Principal Scientist at VTT with more than 35 years of experience in nuclear materials. My main expertiese is behaviour of materials in nuclear environments and failure analyses. I am familiar with SEM, EDS, hardness, optical microscopy and other analyses techniques.

Nuclear materials, failure analysis, microstructure, ageing, aging

Ydinvoimalaitosmateriaalit, vauriotutkimus, mikrorakenne, SEM, EDS, vanheneminen

Education/Academic qualification

Manufacturing and processing, Master, Helsinki University of Technology

Keywords

  • TA Engineering (General). Civil engineering (General)
  • nuclear materials
  • failure analysis
  • SEM
  • ageing

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Welds Engineering & Materials Science
Dissimilar metals Engineering & Materials Science
Stainless steel Engineering & Materials Science
Stress corrosion cracking Engineering & Materials Science
Thermal aging Engineering & Materials Science
Crack propagation Engineering & Materials Science
Austenitic stainless steel Engineering & Materials Science
Crack initiation Engineering & Materials Science

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Research Output 1989 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

Thermal aging
Stainless Steel
casts
stainless steels
Stainless steel

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
Nanoindentation
Hardness
Lead alloys
Thermal aging
Metallography

Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing

Mouginot, R., Sarikka, T., Heikkilä, M., Ivanchenko, M., Tapper, U., Ehrnstén, U. & Hänninen, H., 1 Jan 2018, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Paraventi, D., Wright, M. & Jackson, J. H. (eds.). Springer, p. 321-334 14 p. (Minerals, Metals and Materials Series, Vol. Part F9).

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

Thermal aging
Carbides
Stress corrosion cracking
Aging of materials
Water

Effect of thermal aging on fracture mechanical and microstructural properties of Alloy 52 narrow-gap safe-end dissimilar metal weld

Ahonen, M., Sarikka, T., Mouginot, R., Lindqvist, S., Lydman, J., Ehrnsten, U., Nevasmaa, P. & Hänninen, H., 15 Sep 2018, (Accepted/In press) Proceedings of “Fontevraud 9 - Contribution of Materials Investigation and Operating Experience to Light Water NPPs Safety, Performance and Reliability”, Avignon, 17-20 September 2018. France, 2018.. 13 p.

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

Effect of thermal aging on fracture mechanical properties and crack propagation behavior of alloy 52 narrow-gap dissimilar metal weld

Ahonen, M., Lindqvist, S., Sarikka, T., Lydman, J., Mouginot, R., Ehrnstén, U., Nevasmaa, P. & Hänninen, H., 1 Jan 2018, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Jackson, J. H., Paraventi, D. & Wright, M. (eds.). Springer, Vol. 2. p. 733-747 15 p. (Minerals, Metals and Materials Series; No. Part F11).

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

Dissimilar metals
Thermal aging
Crack propagation
Welds
Fracture toughness