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  • Liquid metal embrittlement (LME) susceptibility of the low activation martensitic steels LA7TaLN, LA12TaLN, LA12TaLC, LA13Ta and their simulated welded structures in liquid Pb-17Li


This paper describes the results of uniaxial tensile tests on four tantalum containing, low activation steels LA7TaLN, LA12TaLN, LA12TaLC and LA13Ta. The tests were performed under vacuum and in liquid Pb-17Li at temperatures of 250 and 400 C at a constant displacement rate of 0.1 mm/min which corresponded to an initial strain rate of 1.1 x 1.0 E-4/s. The results obtained showed that none of the steels exhibited a liquid metal embrittlement (LME) susceptibility in the tempered fully martensitic state. However, a LME was exhibited by the heat affected zone specimens of all the steels tested at 250 C in Pb-17Li, with LA13Ta and LA12TaLN showing the most severe embrittlement. Increasing the testing temperature to 400 C led to the recovery in the ductility of all the steels except LA13Ta which still exhibited an embrittlement in Pb-17Li. The effect of a post weld heat treatment (PWHT) of 750 C/1 h was investigated on the heat affected zone (HAZ) specimens of each steel. Although the PWHT was sufficient to completely recover the properties of the LA7TaLN steel, both LA12TaLC and LA12TaLN exhibited a few percent lower ductility for the PWHT specimens compared to the tempered state. PWHT specimens of LA13Ta only recovered approximately half the ductility exhibited by the tempered martensitic specimens.

Additional information

Authors: SAMPLE T, JRC Ispra (IT);KOLBE H, JRC Ispra (IT);ORECCHIA L, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 17th Symposium on Fusion Technology, Roma (IT), September 14-18, 1992
Availability: Available from (1) as Paper EN 37095 ORA
Record Number: 199310937 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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