DD6高温合金定向凝固枝晶生长的数值模拟研究*

张航, 许庆彦, 史振学, 柳百成

NUMERICAL SIMULATION OF DENDRITE GRAIN GROWTH OF DD6 SUPERALLOY DURING DIRECTIONAL SOLIDIFICATION PROCESS

ZHANG Hang, XU Qingyan, SHI Zhenxue, LIU Baicheng

表1 DD6合金的模拟用参数

Table 1 Simulating parameters of DD6 superalloy

Parameter Unit Value Liquidus K 1672[42] Solidus K 1615[42] Thermal conductivity kJ/(m·s·K) 0.0332[42] Specific heat kJ/(kg·K) 0.773[42] Density kg/m3 8780[42] Latent heat kJ/kg 99[42] Mass fraction % 39.006* Partition 0.788* Liquidus slope ℃/% -3.95* Diffusion coefficient in liquid (DL) m2/s 3.6×10-9 Diffusion coefficient in solid (DS) m2/s 1.0×10-12 Gibbs -Thomson coefficient (G) k·m 3.65×10-7[17] Anisotropy intensity coefficient (g) 0.04