SUS 304 綱の応力腐食割れ感受性に及ぼす冷間加工と熱処理の影響(<小特集>腐食防食小特集)

概要

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The effects of cold working and heat treatment on the stress corrosion cracking (SCC) susceptibility of SUS 304 stainless steel in boiling 35% M_gCl_2 solution at 398K were studied by the constant loading method. The SCC susceptibility of specimens subjected to cold working depends on the amount of α'-martensite ; especially when a large amount of α'-martensite is formed by prestraining at low temperature, the susceptibility shows a marked increase. In this case, the fracture surface morphology is closely related to the presence of strain-induced martensite ( ε, α'), which contributes considerably to the susceptible path for cracking. On the other hand, the SCC susceptibility of specimens subjected to a prior cold working and subsequent heat treatment also depends on the degree of α'→γ reverse transformation, and thus on the amount of residual α'-martensite. By sensitizing the specimens containing a large amount of α'-martensite, the susceptibility to intergranular corrosion by Strauss test decreases. Consequently, this susceptibility does not necessarily agree with that to intergranular cracking in the SCC test solution. Based on the above results, the role of strain-induced martensite in SCC behaviour of metastable austenitic stainless steel was discussed.
社団法人日本材料学会の論文
1981-10-15