Abstract
Solidification crack susceptibility in weld metal of SUS329J2L steel of which ferrite content was varied in the range of about 0 to 100% was evaluated by Trans-Varestraint cracking test. The susceptibility was partly confirmed by self-restraint cracking test. Microsegregation of such detrimental impurities as P and S was studied in relation to the susceptibility. Main conclusions obtained are as follows:(1) Solidification crack susceptibility was minimum at ferrite level from 5 to 20%, and high not only near full austenite region but also in the level more than 40% ferrite region. (2) The cause of this tendency was inferred from the dependency of the microsegregation behavior of S and P on the ferrite content. That seemed to be because the degree of such interdendritic microsegregation is enhanced in high ferrite level compared with 5 to 20% ferrite level, (3) It was shown that such microsegregation behaivor resulted in making the solidification temperature range wider.
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