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 6 報) : 溶接熱影響部における炭化物の析出現象

概要

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Up to this report, it was made clear that M_<23>C_6 precipitated at γ grain boundaries and δ ferrite in which M_<23>C_6 had precipitated, caused knife line attack phenomena in SUS 321 and SUS 347. In this report, the quantitative investigation on the precipitating behaviours of carbides in HAZ was carried out in order to make clear the mechanism of knife line attack phenomenon in detail. Besides, the results obtained in this report were considered to be useful to confirm the mechanism of knife line attack phenomenon reported already. The experimental results obtained in this report are as follows; 1) Precipitation curves of M_<23>C_6 in synthetic HAZ of SUS 321 and SUS 347 shift to lower temperature and longer ageing time side than that in SUS 304. 2) The quantities of M_<23>C_6 and MC type carbides in synthetic HAZ of SUS 321 and SUS 347 during sensitizing heat treatment from 550℃ to 850℃ were quantitatively examined. 3) It was made clear that M_<23>C_6 precipitated in all the knife line attacked region during sensitizing heat treatment from 550℃ to 850℃. This fact strongly supports the mechanism which have been already reported.
社団法人溶接学会の論文
1977-08-05