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


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

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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
Cracks Engineering & Materials Science

Network Recent external collaboration on country level. Dive into details by clicking on the dots.

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
stainless steels
Stainless steel

Microstructural characterization of thermally aged Barsebäck RPV head weld metal

Lydman, J., Hytönen, N., Que, Z., Ehrnstén, U. & Nevasmaa, P., 11 Aug 2019, VTT Technical Research Centre of Finland. 36 p. (VTT Research Report; No. VTT-R-01003-19).

Research output: Book/ReportReport

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
Lead alloys
Thermal aging

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
Stress corrosion cracking
Aging of materials

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., 2018, 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