激光直接沉积成形Ni_(3)Al合金的微观组织及热处理研究  

Research on Microstructure and Heat Treatment of Ni_(3)Al Alloy Formed by Laser Direct Deposition

作　　者：岳锦涛 庞建明[1] 赵琳[1] 朱逸超 梁耀健 YUE Jintao;PANG Jianming;ZHAO Lin;ZHU Yichao;LIANG Yaojian(Central Iron and Steel Research InstituteGroup,Beijing 100081,China;School ofMaterials,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]钢铁研究总院,北京100081 [2]北京理工大学材料学院,北京100081

出　　处：《热加工工艺》2024年第17期89-93,共5页Hot Working Technology

基　　金：国家重点研发计划资助项目(2020YFE0200900)。

摘　　要：研究了激光直接沉积成形高硼Ni_(3)Al合金的微观组织及热处理对合金的影响。结果表明,激光沉积Ni_(3)Al合金组织主要由γ+γ'共晶相、γ'相和硼化物组成。固溶处理时,形状不规则的γ'相和硼化物发生固溶,但随着固溶温度的升高,合金组织中会有β-NiAl相析出;时效过程中,γ'相和硼化物会从基体相中重新析出,新生γ'相和硼化物更加细小、弥散。经过1080℃×4 h,AC+900℃×10 h,AC固溶时效处理后,合金不仅获得了细小弥散的γ'相和硼化物强化组织,且有效抑制了β-NiAl相析出,使得合金力学性能得到了很好的改善。The microstructure of high-boron Ni_(3)Al alloy formed by laser direct deposition and the effect of heat treatment on the alloy were studied.The results show that the microstructure of laser-deposited Ni_(3)Al alloy is mainly composed ofγ+γ'eutectic phases,γ'phase and boride.During the solution treatment,the irregularly shapedγ'phase and the boride are dissolved,but as the solution temperature increases,theβ-NiAl phase is precipitated in the alloy structure.During the aging process,theγ'phase and the boride are precipitated.It is re-precipitate from the matrix phase,and the newγ'phase and boride are finer and more dispersed.After 1080℃×4 h,AC+900℃×10 h,AC solution aging treatment,the alloy not only obtains fine dispersedγ'phase and boride reinforced structure,but also effectively inhibits theβ-NiAl phase precipitation,which improves the mechanical properties of the alloy.

关 键 词：Ni_(3)Al 激光直接沉积 硼化物 微观组织 热处理 

分 类 号：TG156.9[金属学及工艺—热处理]