ZG06Cr13Ni4Mo马氏体不锈钢中TRIP效应的同步辐射高能X射线原位研究

发布时间：2018-03-23 08:08

本文选题：马氏体不锈钢　切入点：同步辐射高能X射线　出处：《金属学报》2015年11期 　论文类型：期刊论文

【摘要】：利用自制的小型拉伸装置对淬火+回火热处理后的ZG06Cr13Ni4Mo马氏体不锈钢试样进行单轴拉伸变形,使用同步辐射高能X射线衍射技术对钢中逆变奥氏体力学稳定性和相变诱导塑性(transformation induced plastic,TRIP)进行原位研究.结果表明,随着拉伸应力的增加,逆变奥氏体衍射峰积分强度逐渐减弱,逆变奥氏体在变形过程中逐步发生了形变诱导马氏体相变.利用Rietveld全谱精修拟合方法对不同应力状态下的逆变奥氏体相分数进行定量分析,发现逆变奥氏体的形变诱导马氏体相变开始于材料的宏观弹性阶段,并持续至整个塑性变形阶段.通过比较分析不同热处理工艺下逆变奥氏体的形变诱导相变过程和材料的加工硬化行为发现,逆变奥氏体的形变诱导相变的出现增加了马氏体基体的位错密度,导致材料加工硬化指数的提高,有效提高了材料的塑性.
[Abstract]:The ZG06Cr13Ni4Mo martensite stainless steel specimen after quenching and tempering was deformed by uniaxial tensile deformation with a self-made small drawing device. The mechanical stability of inverting austenite and transformation induced plastic transformation (induced) in steel are studied in situ by synchrotron radiation high energy X-ray diffraction technique. The results show that the intensity of diffraction peak integral decreases with the increase of tensile stress. Deformation-induced martensite transformation occurs gradually in the process of deformation of inverting austenite. The phase fraction of inverting austenite under different stress states is quantitatively analyzed by Rietveld full-spectrum refinement fitting method. It is found that the deformation-induced martensite transformation of inverting austenite begins at the macroscopic elastic stage of the material. The deformation induced transformation process of inverting austenite and the work hardening behavior of the materials under different heat treatment processes were compared and analyzed. The appearance of deformation-induced transformation of inverting austenite increases the dislocation density of martensite matrix, increases the work hardening index of the material, and effectively improves the plasticity of the material.
【作者单位】：中国科学院金属研究所材料科学国家(联合)实验室;
【基金】：国家自然科学基金资助项目51201167~~
【分类号】：TG142.71

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