Numerical Simulation of Microstructure Distribution in Tooth of 42CrMo Steel Gear during Step Quenching
-
摘要: 建立42CrMo钢齿轮模型，采用Sysweld软件模拟了在分级淬火过程中轮齿的组织分布，并进行了试验验证。结果表明：在硝盐溶液中冷却至表面温度约为175℃时，轮齿组织中的贝氏体含量随着距表面距离的增大而增加，次表层的马氏体含量最高（90%，面积分数，下同），其次为心部的（66%），表面的（58%）最低；在分级淬火冷却结束时，轮齿表面组织由90%马氏体和10%残余奥氏体组成，心部组织为66%马氏体和34%贝氏体；试验测得淬火后轮齿表面的残余奥氏体含量约为7.5%，心部马氏体和贝氏体的含量分别约为69%，31%，试验结果与模拟结果较为吻合。Abstract: 42CrMo steel gear model was established, and then the microstructure distribution in the gear tooth during step quenching was simulated with Sysweld software and verified by experiments. The results show that after being cooled in the nitrate solution until the surface temperature was about 175℃, the bainite content in structure of the gear tooth increased with the distance from the surface increasing; the martensite content in the subsurface layer was the highest (90%, area fraction, the same as below), followed by that in the core (66%), and that in the surface layer was the lowest (58%). After step quenching, the surface microstructure of the gear tooth consisted of 90% martensite and 10% retained austenite, and the core microstructure was composed of 66% martensite and 34% bainite. The retained austensite content at surface of gear tooth after quenching, measured by experiments, was 7.5%, the martensite and bainite content in core was about 69% and 31%, respectively. The experimental results were consistent with the simulation.
-
Keywords:
- 42CrMo steel /
- gear tooth /
- step quenching /
- microstructure distribution /
- numerical simulation
-
-
[1] 黄群超, 卢文壮, 李鹏程,等. 18CrNiMo7-6齿轮钢淬火精确数值模拟[J]. 金属热处理, 2014,39(2):125-128. [2] 朱琳, 申世坤. 合金钢气体渗碳淬火过程的计算机模拟[J]. 铸造技术, 2016, 37(11):2349-2352. [3] 孙重瑞, 郭京浩, 梁新宇. 齿轮钢渗碳过程数学模型及计算机仿真[J]. 热处理技术与装备, 2016, 37(5):43-45. [4] 周志方. 顾剑锋, 王晓燕. 渗碳对后续淬火过程影响的数值模拟与分析[J]. 热加工工艺, 2011, 40(6):158-160. [5] 袁美玲, 张立娟, 刘毅,等. 42CrMo钢热处理过程数值模拟研究[J]. 热加工工艺, 2013, 42(2):182-184. [6] 朱丽. 空心圆柱体铸钢淬火过程的模拟分析[J]. 铸造技术, 2014, 35(1):63-65. [7] 高金柱, 王爱香. 常用高合金齿轮渗碳钢渗层淬透性对比研究[J]. 热加工工艺, 2010, 39(15):40-42. [8] GUPTA G S, CHAUDHURI A, KUMAR P V. Modeling, simulation, and graphical user interface for industrial gas carburizing process[J]. Materials Science and Technology, 2002, 18(10):1188-1194.
[9] 陈金明. 齿轮淬火过程的温度场、热应力与热变形的有限元分析[J]. 热加工工艺, 2011, 40(6):181-184. [10] 吉燕荣, 黄群超. 20CrMnTi齿轮渗碳淬火的计算机模拟与验证[J]. 铸造技术, 2017, 38(5):1047-1050. [11] MUKAI R, MATSUMOTO T, JU D Y, et al. Modeling of numerical simulation and experimental verification for carburizing-nitriding quenching process[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(S2):566-571.
计量
- 文章访问数: 3
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
