增材制造难变形高温合金GH4975的裂纹形成及其愈合机制

叶献文, 姚志浩, 王洪瑛, 王子成, 张砻耀, 董建新

Crack Formation and Healing Mechanisms in Additively Manufactured Hard-Deformed Ni-Based Superalloy GH4975

YE Xianwen, YAO Zhihao, WANG Hongying, WANG Zicheng, ZHANG Longyao, DONG Jianxin

图12 热等静压过程中裂纹愈合过程示意图

Fig.12 Schematics showing the mechanisms of crack healing during HIP (Blue indicates the enrichment level of Al and Ti elements, red point highlights represent the primary factors influencing the change in this step, gray point highlights denote non-primary factors) (a) crack morphology and element diffusion trend (b) crack healing caused by heat and pressure, elements gather at the crack due to oxygen induction (c) crack healing is completed (d) elements diffuse back to the matrix caused by heat