深冷温区应变强化S30408奥氏体不锈钢马氏体相变研究

发布时间：2018-09-07 21:57

【摘要】：对S30408奥氏体不锈钢进行室温应变强化,在深冷温区(77K~4.2K)进一步时效处理,利用金相显微镜、X射线衍射仪(XRD)和透射电子显微镜(TEM)研究了应变诱发和热诱发马氏体相变的微观特征,探讨了马氏体相变的微观机理。结果表明:马氏体相变的含量、微观形貌、形核特征和位错组态随着预应变量的增加和温度的降低而改变,且应变强化比温度对相变的影响要大。诱发马氏体与母相奥氏体的位相关系符合K-S关系,其相变的微观机理为γ(fcc)→ε(hcp)、γ(fcc)→α'(bcc)、γ(fcc)→ε(hcp)→α'(bcc)、γ(fcc)→形变孪晶→α'(bcc)。
[Abstract]:S30408 austenitic stainless steel was strengthened by strain at room temperature. The microcosmic characteristics of strain induced and thermally induced martensite transformation were studied by means of metallographic microscope X-ray diffractometer (XRD) and transmission electron microscope (TEM). The microscopic mechanism of martensitic transformation was discussed. The results show that the content, morphology, nucleation characteristics and dislocation configuration of martensitic transformation change with the increase of prestrain variables and the decrease of temperature, and the effect of strain strengthening temperature is greater than that of temperature. The phase relationship between induced martensite and parent austenite accords with K-S relation. The microscopic mechanism of the phase transformation is 纬 (fcc) 蔚 (hcp), 纬 (fcc) 伪'(bcc), 纬 (fcc) 蔚 (hcp) 伪'(bcc), 纬 (fcc) Twin 伪'(bcc).
【作者单位】：合肥工业大学材料科学与工程学院;合肥通用机械研究院国家压力容器与管道安全工程技术研究中心安徽省压力容器与管道安全技术重点实验室;
【基金】：安徽省自然科学基金项目(1308085ME69) 安徽省重大科学仪器设备开发专项(1310115194) 合肥通用机械研究院青年科技基金(2013010646)
【分类号】：TG142.71

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