曲轴用42CrMo钢激光重熔数值模拟与试验验证  

Numerical Simulation and Experimental Verification of Laser Remelting of 42CrMo Steel for Crankshaft

作　　者：李新凯[1] 孙佳泉 胡露瑶 钟盛 廖茜 吕汝金[1] 魏德强[1] LI Xinkai;SUN Jiaquan;HU Luyao;ZHONG Sheng;LIAO Qian;LÜRujin;WEI Deqiang(Guilin University of Electronic Technology,Guilin 541004,China;Guilin Tourism University,Guilin 541004,China;Guangxi Yuchai Machinery Group Company,Yulin 537000,China)

机构地区：[1]桂林电子科技大学,桂林541004 [2]桂林旅游学院,桂林541004 [3]广西玉柴机器股份有限公司,玉林537000

出　　处：《航空制造技术》2023年第20期86-92,共7页Aeronautical Manufacturing Technology

基　　金：广西自然科学基金(2020GXNSFBA297079、2022GXNSFAA035585);桂林市重点研发计划(20211B032068)。

摘　　要：为探究曲轴用42CrMo钢在激光重熔处理过程中熔池流动和形貌演变规律,建立高度拟合原始形貌的二维仿真模型,利用有限元法对不同激光功率下试样表面进行仿真分析,并结合试验对比分析表面粗糙度和显微硬度变化规律。结果表明,利用熔池流动模型可良好预测42CrMo钢表面熔池流动和表面微起伏变化;熔池内部流速呈现先增大后减小趋势,通过调控激光功率可在实现表面重熔的同时提升试样表面质量;经激光重熔处理后42CrMo钢表面硬度显著提升,达到曲轴工况需求;仿真模型对表面粗糙度和熔池深度预测结果与试验结果基本吻合。In order to explore the evolution law of molten pool flow and morphology of 42CrMo steel for crankshaft during laser remelting treatment,a two-dimensional simulation model with high fitting to the original morphology was established,and the surface of the sample was simulated and analyzed by finite element method under different laser powers,and the variation law of surface roughness and microhardness was compared and analyzed by experiments.The results show that the molten pool flow model can well predict the surface molten pool flow and surface micro-fluctuation of 42CrMo steel.The flow velocity in the molten pool increases first and then decreases.By adjusting the laser power,the surface remelting can be realized and the surface smoothness of the sample can be improved.After laser remelting treatment,the surface hardness of 42CrMo steel is significantly improved,which meets the requirements of crankshaft working conditions.The prediction results of surface roughness and weld pool depth by simulation model are basically consistent with the experimental results.

关 键 词：激光重熔 熔池流动 数值模拟 曲轴 42CRMO钢 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TG665[金属学及工艺—金属切削加工及机床]