二相ステンレス鋼溶接金属の凝固割れ感受性に及ぼすフェライト量とミクロ偏析の検討 : 二相ステンレス鋼の溶接割れ感受性に関する研究(第1報)(昭和62年度秋季全国大会論文発表講演論文)

概要

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Solidification crack susceptibility in weld metal of SUS329J_2L 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 behaivor 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.
1987-08-05