热等静压及后续热处理对K477合金组织及力学性能的影响  

Eff ects of Hot Isostatic Pressing and Subsequent Heat Treatment on Microstructure and Mechanical Properties of K477 Alloy

作　　者：杨经雨 苏捷 黄岚[1] 喻石亚 易出山 刘锋[1] Yang Jingyu;Su Jie;Huang Lan;Yu Shiya;Yi Chushan;Liu Feng(Central South University National Key Laboratory of Powder Metal lurgy,Hu'nan,410083;AECC South Industry Company Limited,Hu'nan,412002)

机构地区：[1]中南大学粉末冶金研究院,湖南410083 [2]中国航发南方工业有限公司,湖南412002

出　　处：《当代化工研究》2024年第16期37-39,共3页Modern Chemical Research

基　　金：湖南省十大技术攻关“航空发动机异形构件精密铸造技术”(项目编号:2022GK1050)。

摘　　要：K477合金是沉淀硬化型高温合金,具有良好的高温性能,但在铸造过程中易存在孔隙缺陷。本文研究了不同热等静压温度对合金铸造孔隙闭合影响,探究直接时效与固溶时效对材料组织及性能的影响规律。结果表明,在1180℃/140 MPa的环境下热等静压2 h能有效闭合K477合金铸件内部孔隙,细化γ′强化相。热等静压后,直接时效工艺后γ′相平均尺寸为0.144μm,形貌为球形;固溶时效处理后,γ′相演变为蝶形,其平均尺寸为0.565μm,在合金内部出现了少量固溶微孔。热等静压后固溶时效处理有助于提升合金室温拉伸性能,直接时效处理可增强合金高温力学性能。K477 alloy is a precipitation hardening superalloy with good high temperature performance,but it is prone to pore defects in the casting process.In this paper,the effects of different hot isostatic pressing(HIP)temperatures on the pore closure of alloy casting were studied,and the effects of direct aging and solid solution aging on the microstructure and properties of materials were investigated.The results show that HIP for 2h at 1180℃/140 MPa can effectively close the internal pores of K477 alloy castings and refine theγ′strengthening phase.After HIP,the average size ofγ′phase after direct aging process is 0.144μm,and the morphology is spherical.After solution and aging treatment,theγ′phase evolved into a butterfly shape with an average size of 0.565μm,and a small amount of solid solution micropores appeared inside the alloy.The solution aging treatment after HIP is helpful to improve the tensile properties of the alloy at room temperature,and the direct aging treatment can enhance the high temperature mechanical properties of the alloy.

关 键 词：K477合金 热等静压 热处理 γ′相 

分 类 号：TG132.32[一般工业技术—材料科学与工程]