[1]李会霞,车倩颖,贺卫卫,等.热处理对电子束选区熔化成形Ti2 AlNb 合金组织与性能的影响[J].中国材料进展,2023,42(06):499-505.[doi:10.7502/j.issn.1674-3962.202203024]
　LI Huixia,CHE Qianying,HE Weiwei,et al.Effect of Heat Treatment on Microstructure and Properties of Ti2 AlNb Alloy Fabricated by Selective Electron Beam Melting[J].MATERIALS CHINA,2023,42(06):499-505.[doi:10.7502/j.issn.1674-3962.202203024]
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热处理对电子束选区熔化成形Ti2 AlNb 合金组织与性能的影响()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
42
期数:
2023年第06期
页码:
499-505
栏目:
出版日期:
2023-06-30

文章信息/Info

Title:
Effect of Heat Treatment on Microstructure and Properties of Ti2 AlNb Alloy Fabricated by Selective Electron Beam Melting
文章编号:
1674-3962(2023)06-0499-07
作者:
李会霞1;  车倩颖1;  贺卫卫1; 2;  向长淑1; 2;  程康康1;  王　宇1
1. 西安赛隆增材技术股份有限公司, 陕西 西安 710018 2. 西北有色金属研究院 金属多孔材料国家重点实验室, 陕西 西安 710016
Author(s):
LI Huixia1;  CHE Qianying1;  HE Weiwei1; 2;  XIANG Changshu1; 2; CHENG Kangkang1;  WANG Yu1
1. Xi‘an Sailong AM Technologies Co. , Ltd. , Xi‘an 710018, China 2. State Key Laboratory of Porous Metals Materials, Northwest Institute for Nonferrous Metal Research,Xi’an 710016, China
关键词:
Ti2 AlNb 合金;  增材制造;  电子束选区熔化;  显微组织;  力学性能
Keywords:
Ti2AlNb alloy;  additive manufacturing;  selective electron beam melting; microstructure;  mechanical properties
分类号:
TG156; TG146. 23
DOI:
10.7502/j.issn.1674-3962.202203024
文献标志码:
A
摘要:
采用电子束选区熔化(selective electron beam melting, SEBM)成形技术制备了高致密的Ti2 AlNb 合金试样, 并以此Ti2 AlNb 合金试样为对象, 系统研究了它在不同热处理制度下的显微组织及物相组成, 并对其硬度、室温及650 ℃ 拉伸性能以及断口形貌进行了分析表征。结果表明, 电子束选区熔化成形Ti2 AlNb 合金热处理态试样的微观组织主要由B2 基体相、晶粒尺寸较大的板条状初生O/ α2 相和细小的次生针状O 相组成, 950 ℃ 固溶+700 ℃ 时效试样的次生针状O 相和α2 相含量较高, 950 ℃固溶+800 ℃时效试样的初生O/ α2 板条更为粗大。700 和800 ℃时效热处理制度下Ti2 AlNb 合金试样的显微硬度值接近, 为3190~3210 MPa。950 ℃固溶+700 ℃ 时效处理试样的室温和650 ℃ 抗拉强度最高, 分别为(1068±12. 22) MPa 和(843±39. 72)MPa; 而950 ℃固溶+800 ℃ 时效处理试样的室温和650 ℃ 下的延伸率更高, 分别为(7. 30±0. 58)%和(8. 50±0. 50)%。950 ℃固溶+700 ℃时效试样的室温拉伸断口观察到较大尺寸的裂纹, 时效温度提高到800℃ 后, 裂纹消失, 高温拉伸断口呈现出韧性断裂特征。
Abstract:
In this paper, Ti2AlNb alloy samples fabricated by selective electron beam melting (SEBM) technology were treated with different heat treatment systems. The microstructure and phase composition of heat-treated samples were analyzed,the microhardness, tensile properties at room temperature and 650℃ and fracture morphology of the samples were evaluated.The results indicate that the microstructure of the heat-treated samples is mainly composed of B2 matrix phase,lath-like primary O/ α2 phase with large grain size and fine secondary needle O phase. Ti2AlNb alloy samples after 950 ℃ solution treatment and 700 ℃ aging treatment exhibit more needle-like O phase and α2 phase. The lath O/ α2 phase of samples after 800 ℃ aging treatment is coarsened to some extent. The heat-treated samples exhibit a microhardness of 3190 ~ 3210 MPa. After aging treatment at 700 ℃, the samples show a higher ultimate tensile strength of (1068±12. 22) MPa and (843±39. 72) MPa at room temperature and 650 ℃ respectively. After aging treatment at 800 ℃, the samples show better tensile elongation of (7. 30±0. 58)% and (8. 50±0.50)% at room temperature and 650 ℃ respectively. After aging treatment at 700 ℃, the tensile fracture of the samples at room temperature exists cracks with large size. From the tensile fracture of samples after aging treatment at 800 ℃, no crack is found. Tensile fracture at high temperature shows a large number of dimples, exhibiting ductile fracture characteristics.

备注/Memo

备注/Memo:
收稿日期: 2022-03-29　　修回日期: 2022-07-11 基金项目: 国家重点研发计划项目(2021YFB3700500); 陕西省科技重大专项(2019zdzx01-04-03); 等离子体动力学重点实验室基金项目(614220220200202) 第一作者: 李会霞, 女, 1990 年生, 工程师 通讯作者: 贺卫卫, 男, 1980 年生, 教授级高级工程师, 博士生导师, Email: hewi126@ 126. com
更新日期/Last Update: 2023-07-26