20CrMnTi钢真空低压渗碳过程数值模拟  

Numerical simulation of low pressure carburizing process for 20CrMnTi steel

作　　者：邓小虎[1] 宋汶娟 凡园园 郭晶玉 王会珍 周乐育 徐跃明 巨东英 Deng Xiaohu;Song Wenjuan;Fan Yuanyuan;Guo Jingyu;Wang Huizhen;Zhou Leyu;Xu Yueming;Ju Dongying(School of Mechanical Engineering,Tianjin Polytechnic Normal University,Tianjin 300222,China;Ningbo Tianan(Group)Co.,Ltd.,Ningbo Zhejiang 315700,China;Beijing Research Institute of Mechanical and Electrical Technology Co.,Ltd.,CAM,Beijing 100083,China;Saitama Technical University,Japan,Valley 369-0293,Japan)

机构地区：[1]天津职业技术师范大学机械工程学院,天津300222 [2]宁波天安(集团)股份有限公司,浙江宁波315700 [3]中国机械总院集团北京机电研究所有限公司,北京100083 [4]日本埼玉工业大学,深谷369-0293

出　　处：《金属热处理》2024年第8期220-224,共5页Heat Treatment of Metals

基　　金：国家重点研发计划(2018YFE0207000);江苏省产学研合作项目(BY2022834)。

摘　　要：依据温度、扩散、相变与应力等多重因素相互作用的原理,利用有限元仿真技术,对20CrMnTi钢在真空低压环境下的渗碳过程进行了模拟与分析。模拟过程充分考虑真空低压渗碳过程强渗和扩散交替进行的边界条件特点,分别对强渗和强渗+扩散进行了模拟计算,得到了碳浓度、马氏体体积分数和硬度分布。结果表明,随着扩散时间的延长,试样表面碳浓度降低,渗碳层深度增大。真空低压渗碳后的碳浓度分布模拟结果与试验结果吻合程度较高,说明模拟准确度较高。模拟得到了强渗+扩散工艺下真空低压渗碳后渗层马氏体体积分数和硬度,二者的分布一致。对比强渗+扩散工艺下真空低压渗碳后试样硬度的模拟结果和试验结果,测量值略高于模拟值,这是因为模拟结果为较大区域的计算平均值。Based on the principle of multiple factors such as temperature,diffusion,phase transformation and stress,finite element simulation technology was used to simulate and analyze the carburizing process of 20CrMnTi steel under low pressure environment.The simulation process fully considered the boundary condition characteristics of the alternating strong infiltration and diffusion in the low pressure carburizing process,and the strong infiltration and strong infiltration+diffusion were simulated separately,the carbon concentration,martensite volume fraction and hardness distribution were obtained.The results indicate that as the diffusion time increases,the surface carbon concentration of the specimen decreases and the depth of the carburized layer increases.The simulation results of carbon concentration distribution after carburizing are in good agreement with the experimental results,indicating high simulation accuracy.The volume fraction of martensite and hardness of the carburized layer after low pressure carburizing under strong infiltration+diffusion process are simulated,and the distribution of the two is consistent.Comparing the simulation and experimental results of hardness of the specimen after low pressure carburizing under strong infiltration+diffusion process,the measured value is slightly higher than the simulated value,because the simulation result is the calculated average of a larger area.

关 键 词：真空低压渗碳 20CRMNTI钢 数值模拟 

分 类 号：TG156.95[金属学及工艺—热处理]