锻压技术

压缩变形温度对车用贝氏体钢动力学及组织演变的影响

英文标题：Influence of compression deformation temperature on dynamics and microstructure evolution of bainitic steel for vehicle

作者：张俊峰邓璘

单位：重庆电子工程职业学院

关键词：压缩变形温度贝氏体相变动力学显微组织解析模型

分类号：TG142.1

出版年,卷(期):页码：2019,44(3):164-168

摘要：

利用热模拟实验机研究不同压缩变形温度下车用贝氏体钢的相变规律，并分析其相变动力学及组织演变。研究结果表明：经过中、低温变形处理的试样曲线表现为抛物线上升。经过300与500 ℃变形处理后，贝氏体的相变速率增大，形成了更多铁素体；在700与850 ℃下，试样中贝氏体含有的铁素体比例比未进行变形处理的试样更低。经过变形处理的试样中贝氏体的形核位置包括晶内的剪切带(SB)、奥氏体晶界(AGB)、贝氏体板条晶棱(GE)；经回复处理后，晶内剪切带的缺陷数量也明显减少，降低了晶内贝氏体板条含量；经过低温变形处理可以使晶内的剪切带数量增加。试样进行等温处理生成了板条状贝氏体组织。经过低温变形的试样生成短粗状的贝氏体板条，当随变形温度升高后，铁素体板条的厚度不断减小。

The phase transition law of bainitic steel at different compression deformation temperatures was studied by the thermal simulation test machine, and its phase transition dynamics and tissue evolution were analyzed. The results show that the curves of the samples after deformation treatment at medium and low temperatures display rising trend of parabola. After dealing with the deformation at 300 and 500 ℃, the bainite transformation rate increases to form more ferrite, and the ratio of ferrite in bainite at 700 and 850 ℃ is lower than that in the sample without deformation treatment. The nucleation of bainite after deformation treatment includes shear band (SB), austenite grain boundary (AGB) and grain edge of bainite (GE). After restoration, the number of defects in shear bands is reduced, and the bainite contents are reduced. However, the number of shear bands can be improved by low temperature deformation. The lath bainite is formed by isothermal treatment of the sample.Thus, short and coarser bainite lath is formed in the specimen deformed at low temperature, and the thickness of ferrite lath decreases with the increase of deformed temperature.

基金项目：

重庆市2017科学技术研究课题（KJ1729412）；重庆市教委科学技术研究项目（KJ1503005）

张俊峰（1980-），男，硕士，副教授，E-mail：5476210@qq.com

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