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对经9%预变形、在不同低温条件下拉伸变形后的深冷容器用应变强化S30408奥氏体不锈钢进行一系列的微观组织结构表征,研究了变形温度对其组织结构演变的影响。结果表明:9%预变形后在1.0×10-3/s应变速率下在-60℃和-196℃的拉伸变形促进了S30408不锈钢发生从g奥氏体向α′-马氏体的转变,拉伸温度越低转变量越多、板条越细;同时,随着拉伸温度的降低S30408不锈钢的显微硬度值升高。低温拉伸形变诱发S30408奥氏体不锈钢马氏体相变,其α′-马氏体与基体g奥氏体的位向关系为{111}g∥{011}α′,<101>g∥<111>α′,符合K-S关系。
The strain hardening S30408 austenitic stainless steel was subjected to a series of microstructural characterizations under 9% pre-deformation and cryogenic temperature after tensile deformation at different low temperatures. The effect of deformation temperature on the microstructure evolution was also studied. The results show that the tensile deformation at -60 ℃ and -196 ℃ under 9% pre-deformation at a strain rate of 1.0 × 10-3 / s accelerates the transformation from austenite to α-martensite in S30408 stainless steel , The lower the drawing temperature the more the amount of change, the thinner the slab; the same time, with the reduction of the drawing temperature S30408 stainless steel increased the microhardness value. The martensite transformation of S30408 austenitic stainless steel induced by low-temperature tensile deformation has the orientation relationship of α’-martensite and austenite of {gb} {011} g // {011} <111> α ’, in line with the KS relationship.