论文部分内容阅读
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.
Using a small self-made tensile device of the quenching + tempering heat treatment of the ZG06Cr13Ni4Mo martensitic stainless steel specimens uniaxial tensile deformation, the use of synchrotron radiation high-energy X-ray diffraction of austenite in the mechanical stability of steel and phase The transformation induced plastic (TRIP) was investigated in situ.The results show that with the increase of tensile stress, the integral strength of the inverted austenite diffraction peak gradually decreases, and the transformation of austenite gradually takes place in the deformation process Deformation-induced martensitic transformation.The quantitative analysis of the transformed austenite phase fraction under different stress states was carried out by Rietveld full spectrum fitting fitting method. It was found that the deformation-induced martensitic transformation of the transformed austenite began Material macro-elastic stage, and continued until the entire plastic deformation stage.Through comparative analysis of different heat treatment process of transformation austenite deformation induced phase transformation process and material hardening behavior found that the deformation induced transformation of austenite phase transition Appears to increase the dislocation density of the martensite matrix, resulting in an increase of the work hardening index of the material and effectively improving the plasticity of the material.