热处理工艺对FGH96合金惯性摩擦焊组织与显微硬度的影响  

Effect of heat treatment on microstructure and microhardness of FGH96 inertia friction welding

作　　者：张春波[1,2] 梁武 周军 乌彦全[1,2] 张友昭 李相伟 ZHANG Chunbo;LIANG Wu;ZHOU Jun;WU Yanquan;ZHANG Youzhao;LI Xiangwei(Harbin Welding Institute Limited Company,Harbin,150028,China;Heilongjiang Provincial Key Laboratory of Advanced Friction Welding Technology and Equipment,Harbin,150028,China;Centre of Excellence for Advanced Materials,Dongguan,523808,China)

机构地区：[1]中国机械总院集团哈尔滨焊接研究所有限公司,哈尔滨150028 [2]黑龙江省先进摩擦焊接技术与装备重点实验室,哈尔滨150028 [3]东莞材料基因高等理工研究院,东莞523808

出　　处：《焊接学报》2023年第8期57-62,I0006,I0007,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(52005139);国家重点研发计划(2022YFB3404901).

摘　　要：采用惯性摩擦焊接方法进行了FGH96高温合金焊接,借助光学显微镜、扫描电子显微镜、显微硬度仪对焊态和热处理态FGH96惯性摩擦焊接头组织和显微硬度进行了研究.结果表明,焊缝中心区内发生完全动态再结晶,再结晶晶粒细小,晶粒尺寸为4.6μm±0.3μm,且二次γ′相完全溶解,导致硬度低于母材组织.随着远离焊缝,二次γ′相含量逐渐增加,距焊缝1.5 mm后γ′相体积分数基本保持不变,但γ′相形貌由球形逐渐向立方体转变,导致硬度逐渐增加.经热处理后,焊缝区域内二次γ′相的含量与形貌变化规律与焊态相似,但热处理后基材晶粒尺寸从11.4μm±0.3μm增大至13.5μm±1.0μm,是导致热处理后基材硬度较焊态较低的原因;另外热处理后三次γ′相的析出是导致热处理态焊缝硬度高于焊态的原因.Using the inertial friction welding method,FGH96 high-temperature alloy was welded.The microstructure and properties of the welded and heat-treated FGH96 joint were studied by means of optical microscope,scanning electron microscope and microhardness tester.The results show that complete dynamic recrystallization occurs in the central area of the weld,the recrystallized grains are fine,the grain size is 4.6μm±0.3μm,and the secondaryγ′phase is completely dissolved,resulting in a lower hardness than the parent material organization.With the distance from the weld,the secondaryγ′phase content gradually increased,and the volume fraction ofγ′phase remained basically unchanged after 1.5 mm from the weld,but theγ′phase morphology gradually changed from spherical to cubic,leading to a gradual increase in hardness.After heat treatment,the content and morphology of the secondaryγ′phase in the weld area changed similarly to the weld state,but the grain size of the base material increased from 11.4μm±0.3μm to 13.5μm±1.0μm after heat treatment,which is the reason for the lower hardness of the base material after heat treatment compared with the weld state.In addition,the precipitation of threeγ′phases after heat treatment is the reason for the higher hardness of the weld in the heat-treated state than in the welded state.

关 键 词：FGH96合金 惯性摩擦焊 晶粒尺寸 γ′析出相 硬度 

分 类 号：TG401[金属学及工艺—焊接]