冷間加工された SUS 304 鋼の鋭敏化と応力腐食割れ

概要

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The effect of sensitization on stress corrosion cracking (SCC) of prior cold-worked SUS 304 steel was investigated in boiling 35%MgCl_2 solution, and the results were compared with the behavior of intergranular corrosion obtained by Strauss test. The mechanical properties of cold-worked specimens were affected markedly by annealing temperature as compared with annealing time. The cold-worked specimen showed the maximum mechanical strength by annealing at 637K, above which the strength gradually decreased with in-creasing annealing temperature. The region of sensitization in T-T-S curves shifted to the lower temperature side with increasing prestrain. The susceptibility to intergranular corrosion became maximum at 20% prestrain, but it decreased at 40% prestrain. The susceptibility to SCC of the prestrained specimens increased with increasing annealing temperature and time, and this tendency was consistent with that in the above-mentioned mechanical strength. The susceptibility to inter-granular cracking in boiling 35%MgCl_2 Solution decreased for the specimens treated in the region of sensitization, and this result was not consistent with that of intergranular corrosion behavior in Strauss test solution.
社団法人日本材料学会の論文
1987-06-15