激光成形修复K418高温合金的微观组织与硬度  

Microstructure and Microhardness of Laser Forming Repaired K418 Superalloy

作　　者：刘建睿[1,2] 王猛 林鑫[1,2] 卢鹏辉[2] 黄卫东 Liu Jianrui;Wang Meng;Lin Xin;Lu Penghui;Huang Weidong(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University;MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,Northwestern Polytechnical University)

机构地区：[1]西北工业大学凝固技术国家重点实验室 [2]西北工业大学金属高性能增材制造与创新设计工信部重点实验室

出　　处：《特种铸造及有色合金》2019年第11期1187-1192,共6页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划基金资助项目(2018YFB1105900)

摘　　要：采用激光立体成形技术对K418合金进行了成形修复,研究了其微观组织与硬度。结果表明,修复K418合金由基体区、热影响区与激光修复区组成,分别由形貌、大小及数量不同的γ-FeCr0.29Ni0.16C0.06基体相、γ′-Ni3Al相及碳化物相组成;铸造基体区与修复区呈紧密的冶金结合,修复区组织呈沉积方向外延生长的柱状晶及连续的层带状结构。在同一沉积层中由于存在粗大树枝晶区与细小树枝晶区而具有不同的硬度。铸造基体区、热影响区与激光修复区的平均硬度值(HV)分别为432.4、499.4、490.6。The microstructure and microhardness of laser forming repaired(LFRed) K418 superalloy were investigated.The results reveal that the LFRed sample can be divided into cast substrate zone(CSZ),heat-affected zone(HAZ)and laser repaired zone(LRZ).The microstructures with different morphology,size and number are composed ofγ-FeCr0.29Ni0.16C0.06matrix phases,γ′-Ni3Al phases and MC carbides phases.The LFRed sample presents a compact metallurgical bonding between CZS and LRZ.The LRZ presents columnar dendrites which grew epitaxially along the direction of deposition and a consecutive layer structure.There are difference in microhardness because of difference in grains size at the same deposition layer.The average microhardness of CSZ,HZA and LRZ reach 432.4,499.4 and 490.6HV,respectively.

关 键 词：激光成形修复 激光增材制造 K418高温合金 微观组织 显微硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]