激光束空域形态对激光定向能量沉积316L不锈钢热输运影响的数值模拟

任松, 吴家柱, 张屹, 张大斌, 曹阳, 尹存宏

Numerical Simulation on Effects of Spatial Laser Beam Profiles on Heat Transport During Laser Directed Energy Deposition of 316L Stainless Steel

REN Song, WU Jiazhu, ZHANG Yi, ZHANG Dabin, CAO Yang, YIN Cunhong

表1 传热模型的参数值

Table 1 Parameter values of the thermal transfer model

Physical parameter Value Unit Ref. Solidus temperature Tsol 1648 K Liquidus temperature Tliq 1673 K Solid specific heat csol 604 J·kg-1·K-1 Liquid specific heat cliq 824 J·kg-1·K-1 Solid thermal conductivity ksol 25 W·m-1·K-1 Liquid thermal conductivity kliq 36 W·m-1·K-1 Room temperature Tref 293.15 K Solid density ρsol 8000 kg·m-3 Liquid density ρliq 6893 kg·m-3 Emissivity ε 0.7 [26] Laser absorptivity η 0.38 Latent heat of fusion L 2.5 × 105 J·kg-1 [29] Convective heat transfer coefficient hcon 80 W·m-2·K-1 [30] Thermal expansion coefficients αexp 5.85 × 10-5 K-1 [31] Dynamic viscosity μ 6 × 10-3 kg·m-1·s-1 [32] Permittivity of vacuum σ' 5.67 × 10-8 W·m-2·K-4