Analysis and Prediction of Workpiece Size Effects in Laser Surface Melting Process

作者：Yi, Peng; Liu, Yancong^*; Shi, Yongjun; Jang, Hao; Lun, Guande

来源：Advanced Science Letters, 2011, 4(4-5): 1312-1317.

DOI：10.1166/asl.2011.1456

• Laser Surface Melting
• Size Effects
• Numerical Simulation
• Thermo-Mechanical Analysis

In process of laser surface melting (LSM), the effects of varied workpiece size on the thermal and mechanical properties of modified metal layers play important roles in obtaining the desired machining goals and reliable service performances. To this end, a three-dimensional transient model for the LSM process is developed using finite element method, the thermo-mechanical parameters depend on temperature are taken into account and the complex physical essences are integrated into calculations. Based on this proposed model, the transient temperature fields and residual stress distributions on workpieces with different three-dimensional size are investigated. The results suggest that the size effects are significantly performed on the values and distribution regions of residual thermal stress. In experimental verification, the LSM on mild steel Q235 is carried on by a continuous CO2 laser and the results are in good agreement with the experimental measurements.

• 出版日期2011-5
• 单位中国石油大学（北京）