热处理对SLM成形GH4099高温合金组织及性能的影响  

Effects of Heat Treatment on Microstructure and Properties of GH4099 High Temperature Alloy Formed by SLM

作　　者：柴尚森 辛吉 韩思雨 刘海龙 王志敏[2] 陈磊[2] 宋金彪 CHAI Shangsen;XIN Ji;HAN Siyu;LIU Hailong;WANG Zhimin;CHEN Lei;SONG Jinbiao(Unit 93160 of the Chinese People’s Liberation Army,Beijing 100071,China;Beijing Hangxing Machinery Manufacture Limited Corporation,Beijing 100013,China)

机构地区：[1]中国人民解放军93160部队,北京100071 [2]北京航星机器制造有限公司,北京100013

出　　处：《新技术新工艺》2025年第2期73-80,共8页New Technology & New Process

摘　　要：针对激光选区熔化(Selective Laser Melting,SLM)制备的沉积态GH4099高温合金力学性能不足的问题,利用扫描电子显微镜(Scanning Electron Microscopy,SEM)、电子背散射衍射(Electron Backscattered Diffraction,EBSD)和拉伸测试研究了热处理对GH4099高温合金微观组织和力学性能的影响。研究结果表明,固溶时效和直接时效均能显著改善沉积态GH4099的力学性能,其中直接时效对于室温屈服强度的改善更为显著。其主要原因是直接时效可显著抑制热处理过程中晶粒的长大,延续了沉积态细小胞状组织和高密度位错;同时,直接时效也会使GH4099合金内部析出更为弥散和细小的γ′强化相,γ′强化相平均尺寸为14.60 nm,含量为20.4%。这也证明直接时效工艺应用于SLM成形GH4099合金是可行的,该工艺可缩短性能调控周期,具有重要的工程应用价值。In response to the insufficient mechanical properties of the deposited GH4099 high-temperature alloy prepared by selective laser melting(SLM),it was investigated that the effect of heat treatment on the microstructure and mechanical properties of GH4099 high-temperature alloy by using scanning electron microscopy(SEM),electron backscattering diffraction(EBSD),and tensile testing.The research results indicated that both solid solution aging and direct aging could significantly improve the mechanical properties of deposited GH4099,and the direct aging had a more significant effect on the yield strength at room temperature.The main reason was that direct aging could significantly inhibit the growth of grains during the heat treatment process,which continued the deposited fine cellular structure and high-density dislocations.At the same time,the direct aging could also cause the precipitation of more dispersed and fineγ′strengthening phases inside GH4099 alloy.The average size of theγ′strengthening phase was 14.60 nm,with a content of 20.4%.This also proved that the direct aging process was feasible for SLM forming GH4099 alloy,which could shorten the performance control cycle and had important engineering application value.

关 键 词：SLM GH4099 固溶时效 直接时效 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金] TH162[金属学及工艺—金属学] TP206.1[机械工程—机械制造及自动化]