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2 GH4975不同工艺参数下打印后样品的OM像

Fig.2 OM images of as-build GH4975 samples under laser powers of 160 W (a1-e1), 180 W (a2-e2), 200 W (a3-e3), 220 W (a4-e4), 240 W (b5-e5) and scan rates of 400 mm/s (a1-a4), 500 mm/s (b1-b5), 600 mm/s (c1-c5), 700 mm/s (d1-d5), 800 mm/s (e1-e5) (BD—building direction. Printing was terminated due to severe warping at laser power 240 W and scan rate 400 mm/s)