Ulla Ehrnstén

Principle Scientist

  • Phone+358405354057
1989 …2019

Research output per year

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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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Research Output

Determination of T0 with Miniature C(T) Specimens for a High-Ni Weld Metal used in a Boiling Water Reactor Pressure Vessel

Sirkiä, L., Lydman, J., Ehrnstén, U. & Lindqvist, S., 2019, Baltica XI: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, 10 p.

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

Open Access

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 journalArticle

  • 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 journalArticle

    Open Access