Numerical simulation of the effects of preheating on nickel-based alloy wide-band laser cladding
A 3-D finite element model for the numerical simulation of wide band laser cladding was established by means of a finite element code—SYSWELD, in which the change of thermal mechanical parameters with temperature was considered and the 3-D wide-band volumetric heat source was adopted. The influence of preheating on the distribution of temperature field, and stress field were predicted. The results shows that the peak temperature of cladding layer reaches to 1915.37℃. The preheating could improve the peak temperature of thermal cycle and prolong the t8/5，which could reduce the cooling rate. The microstructure of cladding layer is cast structure and the grain size of fusion zone is coarse. The microstructure of heat affect zone(HAZ) is martensite and bainite. The tensile stress exists in the cladding layer while the compressive stress appears in the HAZ of the substrate. The larger Von-Mises residual stresses are distributing along the longitudinal direction horizontal direction and section direction which may lead to crack. The preheating could reduce the value of Von-Mises residual stress and reduce the tendency to crack.
Laser cladding Wide-band heat source Numerical simulation Preheating
Bin Han Zhe Zhang Yong Wang Sheng Wan
College of Mechanical and Electronic Engineering, China University of Petroleum, 66 Changjiang West Road, Qingdao, 266580, China
国际会议
济南
英文
1-9
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）