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6 裂纹源区域局部放大组织及取向特征

Fig.6 Localized amplified microstructure and orientation characteristics in the crack source region (HAGB—high-angle grain boundary, LAGB—low-angle grain boundary) (a) BSE image of the crack initiation region (b) enlargement of the selected area in Fig.6a (c-e) IPFs along the X (c), Y (d), and Z (e) directions, respectively (f) KAM map of the selected area in Fig.6a