摘要
针对压片预置式激光熔覆温度场数值模拟,在建立粉末片模型时提出单独建立粉末片冶金化模型和气孔模型。同时,为了比较真实地模拟压片预置式激光熔覆的物理冶金过程,考虑了粉末片组织形态、接触热阻和厚度的变化对温度场的影响。在数值模拟过程中进行不同组织形态的粉末片物性参数折算、不同接触形式的接触热阻计算以及不同工艺参数下的激光吸收率的选取。通过两组实验对基材熔池的宽度和深度进行验证,表明使用该模型计算出的温度场能较精确地反映激光熔覆过程的温度场。
In this paper, metallurgy squashing model and cell model are suggested respectively for numerical simulation of temperature field of squash presetting laser cladding when the squashing model is constructed. In order to simulate the process of laser cladding truly, the change of the organization format of the squashing, contact resistance and height of the squashing is considered. In the process of simulation, the conversion of physical parameters of different structure organization, contact resistance of different contacting format and the laser absorptivity of different process parameters is done. Two experiments are used to verify the temperature field in the way of width and depth of molten pool of the substrate. The result shows the temperature filed obtained by this model is accurately accorded with the temperature field of laser cladding in reality.
出处
《应用激光》
CSCD
北大核心
2010年第3期183-188,共6页
Applied Laser
基金
南京航空航天大学研究生创新基地(实验室)开放基金资助(项目编号:200902011)
南京航空航天大学"十一五"研究生人才培养建设项目(项目编号:KCJS0806)
关键词
压片预置式
温度场
激光熔覆
数值模拟
squash presetting
temperature field
laser cladding
numerical simulation
