深冷処理したSUS301鋼の応力腐食割れ感受性(<小特集>腐食防食小特集)

概要

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The susceptibility of subzero treated SUS 301 stainless steel to stress corrosion cracking (SCC) was studied in boiling 35% MgCl_2 solution at 200MPa. The specimens were prepared by subzero cooling to 77 K for 28.8ks after 0〜45% prestraining at 195 K or 373 K, and they were successively SCC-tested. The content of α'-martensite formed by subzero cooling was found to be maximum at about 5% prestrain at 373 K. Above this prestrain, however, the mechanical stabilization of retained austenite occurred as a result of gradual decrease in α'-martensite content. On the other hand, the SCC susceptibility of the subzero treated specimens decreased with increasing α'-martensite content, which seems to be caused by promotion of general corrosion and thus prevention of crack initiation during SCC-tests. The transgranular fracture occurring along the {111} plane for the subzero treated specimens was characterized by the plate-like pattern. In this case, it seemed that ε-martensite contributed to the susceptible path for hydrogen cracking. Based on the above results, the role of thermally transformed martensite during SCC of metastable austenitic stainless steel was discussed.
社団法人日本材料学会の論文
1983-11-15