热处理消除激光选区熔化GH4169高温合金微观组织及高温拉伸性能各向异性  

Heat treatment to eliminate anisotropy of microstructure and high-temperature tensile properties of GH4169 superalloy by selective laser melting

作　　者：赵海生 房立家 刘欢 窦开沁 ZHAO Haisheng;FANG Lijia;LIU Huan;DOU Kaiqin(Welding and Plastic Forming Division,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Technical Department,HFYC(Zhenjiang)Additive Manufacturing Co.,Ltd.,Zhenjiang 212132,Jiangsu,China)

机构地区：[1]中国航发北京航空材料研究院焊接与塑性成形研究所,北京100095 [2]航发优材(镇江)增材制造有限公司技术部,江苏镇江212132

出　　处：《材料工程》2025年第3期54-62,共9页Journal of Materials Engineering

基　　金：国家重点研发计划项目(2023YFB4604900)。

摘　　要：激光选区熔化GH4169高温合金具有明显的定向柱状枝晶凝固组织,会引起严重的力学性能各向异性,增加服役风险。本工作以激光选区熔化(SLM)技术制备的GH4169高温合金为研究对象,设计两种不同的热处理制度:热等静压+标准固溶+双时效和热等静压+均匀化热处理+标准固溶+双时效对所制备合金进行后热处理,探究两种热处理制度对激光选区熔化GH4169高温合金微观组织及高温拉伸性能各向异性的影响。结果表明:均匀化热处理消除了Laves相,沉积态GH4169合金的柱状晶组织向等轴晶组织转变。高温拉伸结果显示,未经均匀化处理GH4169合金横向与纵向的高温抗拉强度比和塑性比分别为1.10(1145/1040)和0.83(10.2/12.2),均匀化热处理态GH4169合金横向与纵向的高温抗拉强度比和塑性比分别为1.00(1041/1038)和1.00(8.6/8.6)。激光选区熔化GH4169合金微观组织与力学性能各向异性被消除。The selective laser melted(SLM)GH4169 superalloy has a significant directional columnar dendritic solidification microstructure,which can cause severe mechanical property anisotropy and increase service risk.The GH4169 superalloy prepared by laser selective melting(SLM)technology is taken as the research object,and two different heat treatment processes are designed:hot isostatic pressing+standard solid solution+double aging and hot isostatic pressing+homogenization heat treatment+standard solid solution+double aging for post-heat treatment of the prepared alloy.The effect of two heat treatment processes on the anisotropy of microstructure and high-temperature tensile properties of GH4169 superalloy prepared by laser selective melting is investigated.The results show that the homogenization heat treatment eliminates the Laves phase,and the columnar crystal structure of the as-built GH4169 alloy transforms into an equiaxed crystal structure.The high-temperature tensile results show that the hightemperature tensile strength ratio and plasticity ratio of GH4169 alloy in the transverse and longitudinal directions without homogenization treatment are 1.10(1145/1040)and 0.83(10.2/12.2),respectively.The high-temperature tensile strength ratio and plasticity ratio of GH4169 alloy in the transverse and longitudinal directions after homogenization heat treatment are 1.00(1041/1038)and 1.00(8.6/8.6),respectively.The anisotropy of microstructure and mechanical properties of GH4169 alloy prepared by laser selective melting is eliminated.

关 键 词：激光选区熔化 GH4169高温合金 均匀化热处理 各向异性 微观组织 高温拉伸性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TB31[金属学及工艺—合金]