In718合金激光粉末床熔融悬垂结构成形数值模拟与实验研究

王材桦,来旭辉,杨欢庆,魏正英

Numerical simulation and experimental study on forming of overhang structure by laser power bed fusion of In718 alloy

Cai-hua WANG,Xu-hui LAI,Huan-qing YANG,Zheng-ying WEI

表 1 In718镍基高温合金数值仿真的初始输入参数

Tab.1 Initial input parameters for numerical simulation of In718 nickel-based superalloy

参数 数值 In718固相线Ts/K 1 533 In718液相线Tl/K 1 609 In718汽化温度Tv/K 3 188 熔化潜热Lsl/( J·kg−1) 2.27×105 蒸发潜热Lv/( J·kg−1) 7.34×105 M/( kg·mol−1) 0.059 75 激光吸收率系数α 0.3 环境温度Te/K 293.15 光斑半径ω/μm 40 表面辐射系数εr 0.36 Stefan-Boltzmann常数 σs/(W·m−2·K−4) 5.67×105 对流系数hc/(W·m−2·K−1) 10 环境压力p0/Pa 1.013×105 摩尔气体常数R/(J·mol−1·K−1) 8.314 表面张力系数σ/(N·m−1) 1.882 温度敏感系数( $ \text{dσ}·\text{d}{T}^{-1} $)/ (N·m−1·K−1) −0.1×10−3