选区激光熔化 γ' 相强化镍基高温合金裂纹形成机理与抗裂纹设计研究进展

祝国梁, 孔德成, 周文哲, 贺戬, 董安平, 疏达, 孙宝德

Research Progress on the Crack Formation Mechanism and Cracking-Free Design of γ' Phase Strengthened Nickel-Based Superalloys Fabricated by Selective Laser Melting

ZHU Guoliang, KONG Decheng, ZHOU Wenzhe, HE Jian, DONG Anping, SHU Da, SUN Baode

图4 不同析出相类型镍基高温合金热处理开裂的温度与时间关系[41]，选区激光熔化CM247LC合金不同温度热处理2 h后裂纹密度统计，晶界处高温失塑裂纹与应变时效裂纹形貌[42]

Fig.4 Temperature and time relationship of heat treatment cracking of nickel-based superalloys with different precipitate types (t—time) (a)[41], statistics of crack density after 2 h heat-treatment at different temperatures for selective laser melted CM247LC alloy (b)[42], high temperature plasticizing crack at grain boundary (c)[42], and strain-aged crack (d)[42]