激光熔融沉积成形GH4169裂纹扩展性能研究  

Study on the Crack Propagation Performance of GH4169 Formed by Laser Metal Deposition

作　　者：韩中宝 陈龙庆[2] 刘璞 Han Zhongbao;Chen Longqing;Liu Pu

机构地区：[1]中国航发航空科技股份有限公司,四川成都610500 [2]四川大学原子核科学技术研究所,辐射物理与技术教育部重点实验室,四川成都610064 [3]钢研纳克检测技术股份有限公司,北京100000

出　　处：《大型铸锻件》2023年第1期1-4,13,共5页Heavy Casting and Forging

基　　金：四川省科技计划国际合作项目(No.2021YFH0174)。

摘　　要：采用激光熔融沉积(LMD)技术采用标准热处理工艺制度获得了高致密GH4169合金试块,并对不同沉积方向的试样进行了疲劳裂纹扩展趋势及机理研究。通过数据处理与分析,揭示LMD-GH4169的疲劳裂纹扩展规律。研究结果表明,在试验条件下,LMD-GH4169合金抵抗裂纹扩展能力存在各向异性,在相同裂纹扩展参数、设定载荷下,激光扫描路径方向沉积试样抵抗裂纹扩展的能力明显弱于沿沉积高度方向试样,其微观结构是构成疲劳裂纹扩展行为的差异的主要原因。High density GH4169 alloy specimens have been obtained by laser melting deposition(LMD)technology combined with standard heat treatment process,and the trend and mechanism of fatigue crack propagation of specimens within different deposition directions has been studied.Through data processing and analysis,the fatigue crack propagation law of LMD-GH4169 has been revealed.The results show that under this working test condition,the ability of LMD-GH4169 alloy to resist crack propagation is anisotropic.Under the same crack propagation parameters and load set,the ability of the specimen deposited along the laser scanning path to resist crack propagation is significantly weaker than that along the deposition height direction.The microstructure is the main reason for the difference in fatigue crack propagation behavior.

关 键 词：激光熔融沉积 GH4169合金 疲劳裂纹扩展性能 各向异性 

分 类 号：TG132.3[一般工业技术—材料科学与工程]