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

图9 晶界角与枝晶凝并温度及晶界能之间的关系

Fig.9 Relationships between GB angle (θ) and the dendrite coalescence temperature and GB energy (γ_gb) (T—temperature, θ_c—critical transition angle, θ_m—the angle corresponding to the maximum GB energy, $T_{b, m i n}^{r}$ —the minimum dendrite coalescence temperature for a repulsive boundary, $T_{b}^{a}$ —the dendrite coalescence temperature for an attractive boundary, ΔT_b—dendrite coalescence undercooling ΔT_b,marx—the max dendrite coalescence undercooling)