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 7 報) : 希土類元素の添加によるナイフラインアタック感受性の改善

概要

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The mechanism of knife line attack phenomena in SUS 321 and SUS 347 were already investigated in detail up to this report. In this report, effects of addition of rare earth metals (REM) on the improvement of knife line attack sensitivities in SUS 321 and SUS 347 were studied based on the results obtained in the previous reports. At the same time, the mechanical properties and the corrosion resistances of REM bearing SUS 321 and SUS 347 were examined. The results obtained in this reports are as follows; 1) The knife line attack sensitivities of SUS 321 and SUS 347 were improved by addition of REM. The optimum quantities of REM were about 0.15% in SUS 321 and about 0.11% in SUS 347. 2) By addition of REM, the quantities of M_<23>C_6 precipitated in HAZ of both SUS 321 and SUS 347 decreased. This fact was considered to be the cause of improvement of knife line attack sensitivities in these steels. 3) Tensile properties at elevated temperature of REM bearing steels were almost same as ones in base steels, and corrosion resistances of REM bearing steels were slightly improved.
社団法人溶接学会の論文
1977-09-05