18-8 ステンレス鋼線の応力腐食割れにおよぼす冷間引抜加工とアルミニウムめつきの影響

概要

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A study was made of the effects of cold drawing and hot dip aluminizing on stress corrosion cracking (SCC) of 18-8 stainless steel wire. SCC tests were carried out in boiling 42% MgCl_2 solution. The main results are summarized as follows : (1) The effect of cold drawing before annealing on the SCC susceptibility was almost negligible. (2) The effect of cold drawing after annealing on the SCC susceptibility varied with the applied stresses. When applied stress was lower than 10 kg/mm^2, increased susceptibility was observed in a specific range of cold drawing. The maximum susceptibility appeared at 16% in cold drawing. (3) The increased susceptibility was accompanied by the formation of ε′ martensite, whereas greater cold drawing beyond the susceptible range induced the formation of α′ martensite. The observed facts suggest the different effect of ε′ and α′ martensite on the development of SCC. (4) When susceptibility was increased by cold drawing, cracks propagated transgranularly to certain depth and then converted to intergranularlyl. (5) Hot dip aluminizing was beneficial in preventing austenitic stainless steel wire from SCC.
社団法人日本鉄鋼協会の論文
1975-05-01