Effect of processing parameters on thermal phenomena in direct laser metallic powder deposition
(0) Direct laser metallic powder deposition technique is widely used in manufacturing, part repairing and metallic rapid prototyping. The ability to predict geometrical accuracy and residual stress requires an understanding of temperature distribution during the deposition process. This study presents a numerical model of three-dimensional transient heat transfer in a finite model heated by a moving laser beam and thermal phenomena in the process are investigated. The complex solid-liquid problem and latent heat of fusion are treated by means of equivalent thermal conductivity and modified specific heat, respectively. Using method of birth and death of elements, the growth of additive layers and the shape of melt pool are obtained. The effect of processing parameters such as absorbed power, travel speed, and preheated temperature on melt pool sizes and cross-section of deposited layer profile are studied. The results obtained show the trend of the melt pool size and cross section profile during depositing the sample of 304 stainless steel and they are generally in a good agreement with experiments in published literature.
laser direct deposition melt pool cross-section profile thermal field simulation
HU Weiwei KANG Jinwu HUANG Tianyou
Key Laboratory for Advanced Materials Processing Technology Ministry of Education,Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China
国际会议
北京
英文
395-400
2008-11-06（万方平台首次上网日期，不代表论文的发表时间）