摘要
传统铸造工艺制备TiAl合金存在成分偏析、组织不均匀及易开裂等问题,限制了其进一步应用。本文采用粉末热等静压法制备TiAl合金,结合数值模拟和试验,研究了TiAl合金粉末体在热等静压过程中致密度变化规律,以及合金显微组织与力学性能的关系。结果表明:在热等静压工艺1280℃/170 MPa/4 h条件下,TiAl合金锭无裂纹、孔洞等缺陷,主要由细小α_(2)和γ晶粒组成,呈近γ组织特征。粉末体芯部和边角区域致密度变化滞后于边部。结合简单热处理工艺可调控出双态和片层组织特征,合金显微硬度由初始态329.5HV最高提升至482.5HV。
The traditional casting process for preparing TiAl alloys has problems such as compositional segregation,uneven microstructure,and susceptibility to cracking,which limit their further application.This article uses powder hot isostatic pressing method to prepare TiAl alloy,and combines numerical simulation and experiment to study the density change law of TiAl alloy powder during hot isostatic pressing process,as well as the relationship between alloy microstructure and mechanical properties.The results show that under the conditions of 1280 C/170 MPa/4 h,TiAl alloy ingots has no defects such as cracks and pores,mainly composes of smallα_(2)andγgrains,exhibiting nearγmicrostructure characteristics.The density changes in the core and corner regions of the powder body lag behind those in the edges.By combining a simple heat treatment process,the dual state and lamellar microstructure characteristics can be controlled,and the microhardness of the alloy can be increased from an initial state of 329.5HV to a maximum of 482.5HV.
作者
高文强
楚玉东
郭亚山
周东妍
刘艳
冯菁铭
王艺超
GAO Wenqiang;CHU Yudong;GUO Yashan;ZHOU Dongyan;LIU Yan;FENG Jingming;WANG Yichao(Innovation Center NPU Chongqing,Chongqing 401135,China;Sanhang Advanced Materials Research Institute Co.Ltd.,Chongqing 401135,China;Ningbo Branch of China Academy of Ordnance Sciences,Ningbo 315103,China;Inner Mongolia Metal Material Research Institute,Baotou 014030,China)
出处
《兵器材料科学与工程》
北大核心
2025年第4期1-5,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金(52401174)
内蒙古自治区自然科学基金(2024SHZR2827)。
关键词
粉末热等静压
TIAL合金
热处理
显微组织
显微硬度
powder hot isostatic pressing
TiAl alloy
heat-treatment
microstructure
micro-hardness
作者简介
第一作者:高文强,男,硕士,高级工程师。E-mail:15353736564@163.com;通信作者:王艺超,男,博士,助理研究员。E-mail:glory.way@mail.nwpu.edu.cn。
