SUS304オーステナイトステンレス鋼溶接金属の低サイクル疲労特性

概要

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Completely reversed strain controlled low cycle fatigue properties at room temperature are investigated for SUS304 austenitic stainless steel and weld metals. The metal specimens deposited by shield metal arc welding (SMAW) and gas metal arc welding (GMAW) were taken from multi-pass weld metal such that gage length consisted entirely of the weld metal. The results indicate that there is a trend toward reductions in the low cycle fatigue life of weld metals as compared with the base metals in the range of 3×10^2<N_f<6×10^4. They are explained in terms of lack of ductility by the deformation-induced martensitic transformation in SUS304. The martensite transformation is hardly induced in weld metals with 3~11% delta ferrite and the fatigue properties of weld metals are clearly different from the base metal (SUS304). This study leads to the conclusion that fairly accurate estimates of the low cycle fatigue life of weld metal can be obtained and the life estimation of SUS304 is impossible using Manson's universal slope method.
社団法人日本機械学会の論文
1988-06-25