35CrMo钢表面宽带激光熔凝过程数值模拟及分析
首发时间:2008-01-18
摘要:本文利用有限元分析软件SYSWELD,建立了三维有限元模型,考虑相变潜热及材料热物性参数随温度变化等因素的影响,对35CrMo钢平板试样进行了激光宽带熔凝过程的数值模拟,分析了激光熔凝过程中组织,硬度和残余应力的变化,及激光功率对组织,硬度和残余应力变化的影响。对激光熔凝后的试样进行了组织、硬度分析,结果表明,计算值和测量值相吻合。通过优化激光参数,可以获得以马氏体为主的熔凝组织,熔凝层厚度为1.7mm,最高硬度达到768HV0.2,其残余应力为压应力。
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FEM Simulation and Analysis of Broad-band Laser Remelting Process on 35CrMo steel surface
Abstract:Based on the laser wide band melting process, a three-dimensional finite element model has been developed and latent heat and thermal physical parameters dependent on temperature have been taken into account to simulate the laser melting process of 35CrMo steel using the FEM of SYSWELD. The variation of microstructure and micro-hardness in laser remelting process were analyzed, and effect of the laser parameter on them were also analyzed. After laser remelting, metallographic analysis of the microstructure and measure the hardness of remelting zone were done. The results show that the values calculated were close to the values measured. A major microstructure of martensite and pressure stresss in laser remelting layer with depth and highest micro-hardness of 1.7mm and 768HV0.2 respectively can be obtained through optimizing the laser parameters.
Keywords: broad-band laser remelting, FEM, microstructure, residual stress
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No.1820118798212006****
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