Numerical Simulation of the Temperature Field in Multi-layer Powder-feeding Laser Cladding Forming
The numerically simulation of temperature field was carried out by the ANSYS software in multi-layer powder-feeding laser cladding forming.3-D finite element model was found,which nonlinear characteristics of the material thermal properties and the boundary conditions of the convective transfer heat was considered; The process of powder falling into the substrate and cladding element growing was accomplished by Element Birth and Death technology in the process of numerical simulation.The result shown that the primarily solidified cladding layer to the following cladding layer has a preheating function in the process of multi-layer laser cladding forming,the initial temperature of following cladding layer is higher than primarily melted cladding layer; The thermal cycling curves of the molten pool nodes takes on periodic variation and basic similar in every layer cladding; The end effect problem is apt to happen in cladding layer,which the phenomenon of edge collapsing or partially burnt is formed; The temperature gradient distribution is divided into two parts,the temperature gradient level distribution along the laser scanning direction in the top and perpendicular distribution in the bottom,The temperature gradient appearances mutation and maximum value in the junction of the substrate and cladding layer,which the crack is apt to be caused in this region.
Laser Cladding Forming Numerically Simulation Temperature Field Element Birth and Death Temperature Gradient
Zhang Jun Song Jian Li Li Yong Tang Chen Fei
School of Materials Science and Engineering, Taiyuan University of Science and Technology,Taiyuan, 030024, China
国际会议
香港
英文
1418-1423
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）