55CrMo钢的奥氏体化相变动力学  

Phase-transformation kinetics of austenization for 55CrMo steel

作　　者：贺连芳[1] 李辉平[1] 盖康 张春芝[1] 李木森[2] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590 [2]山东大学材料科学与工程学院,山东济南250061

出　　处：《材料热处理学报》2015年第10期255-260,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51175302;51575324);国家科技重大专项(2011ZX04014-031);教育部"新世纪优秀人才支持计划"(NCET-12-0342)

摘　　要：为了利用数值模拟技术计算感应加热过程中丝杠的奥氏体化情况,利用Gleeble1500D热模拟试验机,测试了55CrMo钢试样在升温速率为0.05^-50 K/s时的膨胀曲线,得到了它的奥氏体化温度与加热速率的关系。根据相变膨胀曲线,利用杠杆定律得到了奥氏体转变量与温度的关系,并对非等温相变Johnson-Mehl-Avrami(JMA)方程中的动力学参数进行了线性回归分析,得到了JMA相变动力学模型。利用数值模拟技术,计算了丝杠在感应加热时的奥氏体化情况和淬火后的硬度曲线,并与实验结果进行对比。结果表明,模拟结果与实验结果吻合得较好,所得到的JMA方程能较好地描述55CrMo钢的奥氏体化过程。In order to calculate the volume fraction of austenite using numerical simulation method in the induction heating process,the dilatometric curves of 55 Cr Mo steel were measured on a Gleeble-1500 D thermal-mechanical simulator at the heating rates of 0. 05-50 K / s,and the relationship curves between austenization temperature and heating rate were obtained. According to the dilatometric curves,the relationship between the volume fraction of austenite and temperature was attained by the lever law. The Johnson-Mehl-Avrami（ JMA）equation of austenization was given by linear regression analysis of the experimental results. The volume fraction of austenite in the induction heating and the hardness curves after quenching were attained using the numerical simulation method,and the calculation results were compared with the experiment results. It shows that the calculation data are well consistent with the experiment data,the JMA equation obtained by the linear regression can well describe the austenization of 55 Cr Mo steel.

关 键 词：相变动力学 JMA方程 数值模拟 感应淬火 

分 类 号：TG156.3[金属学及工艺—热处理]