安定形オーステナイトステンレス鋼における炭化物の挙動とナイフラインアタック現象(第 2 報) : ナイフラインアタック現象の機構の解明 (1)

概要

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In previous report, the influence of welding heat inputs and heat treatment conditions after welding on knife line attack phenomenon in stabilized austenitic stainless steels was investigated and it was suggested that there was the intimate relation between the cause of the above phenomenon and the microstructure in knife line attacked region. In this report, electron microscopic investigations in HAZ were conducted and the behaviour of carbides was studied in order to make clear the cause and the mechanism of knife line attack phenomenon. The experimental results obtained in this study are as follows; (1) MC type carbides in HAZ dissolved partially or almost perfectly during welding. (2) Under sensitizing heat treatment, M_<23>C_6 type carbide precipitated at austenite grain boundaries. (3) According to the fact that the net work of M_<23>C_6 around the austenite grain boundaries causes intercrystalline corrosion, M_<23>C_6 type carbide precipitated in HAZ near the weld interface was considered to be the cause of knife line attack phenomenon.
社団法人溶接学会の論文
1975-09-05