激光增材修复单晶高温合金的热裂纹形成机制

卢楠楠, 郭以沫, 杨树林, 梁静静, 周亦胄, 孙晓峰, 李金国

Formation Mechanisms of Hot Cracks in Laser Additive Repairing Single Crystal Superalloys

LU Nannan, GUO Yimo, YANG Shulin, LIANG Jingjing, ZHOU Yizhou, SUN Xiaofeng, LI Jinguo

表1 计算枝晶凝并过冷及晶界能所需的热物理参数[29~31]

Table 1 Physical parameters used to calculate the undercooling ΔTb and grain boundary energy γgb[29-31]

Physical parameter Value Unit Ref. Shear modulus G 86.3 GPa [29] Burgers vector b 3.578 × 10-10 m [30] Solid/liquid interfacial energy γsl 310 mJ·m-2 [31] Poisson ratio ν 0.467 - [29]