摘要
为揭示TC4ELI合金随热处理温度的不同,显微组织、力学性能及相组成的变化规律,研究了TC4ELI钛合金经700~1000℃热处理并空冷的组织演变,进行了室温力学性能测试与XRD分析。结果表明:800℃热处理后,合金实现了再结晶,α相均匀等轴化,体积含量达到最大值。XRD图谱未出现β相的衍射峰,均为α相的衍射峰。700~800℃热处理时可以获得良好的综合性能,满足相关标准要求。850~950℃温度范围内,TC4ELI合金有二次针状α相析出,属于双态组织。随着温度的升高,由于合金中β相的晶粒粗化与含量增加,使得强度与弹性模量下降。1000℃热处理后,立方马氏体α’相具有较强的(002)α’、(101)α’衍射峰,其它晶面的衍射峰能量很弱,合金的弹性模量达最大值110 GPa。通过显微组织观察,推断TC4ELI合金α+β→β转变的开始温度处于850~870℃,终了温度处于950~970℃。
In order to reveal the microstructure evolution,mechanical properties and phase composition of TC4ELI alloy with different heat treatment temperatures,the microstructure of TC4ELI alloy heat treated at 700-1000 ℃ with air-cooling conditions was studied,and the room temperature mechanical properties and XRD of the samples were tested. The results show that the alloy achieves crystallization when heat treated at 800 ℃.The α phase is homogeneous and equiaxial,and its volume fraction reaches the maximum. There are all diffraction peaks of the α phase in the XRD pattern but for the β phase. In the range of 700-800 ℃,the alloy can obtain the good comprehensive performance,and meet the requirement of related standards. In the temperature range of 850-950 ℃,the TC4 ELI alloy is the bimodal microstructure with the precipitation of the secondary needle-like α phase. As the temperature increases,the strength and elastic modulus decrease due to the increase of grain size and volume fraction of the β phase in the alloy. After heat treated at 1000 ℃,the cubic martensite phase has strong (002)_α’ and(101)_α ’diffraction peaks,and the diffraction peak energy of other lattice orientations is very weak,and the elastic modulus of the alloy reaches a maximum of 110 GPa. Through microstructure observation,the start temperature of α + β → β transformation is in the range of 850-870 ℃,and the finish temperature of that is in the range of 950-970 ℃.
作者
毛江虹
杨晓康
罗斌莉
魏芬绒
Mao Jianghong;Yang Xiaokang;Luo Binli;Wei Fenrong(Northwest Institute for Nonferrous Metal Research,Xi’an Saite Simai Titanium Industry Co.,Ltd.,Xi'an Shaanxi 710200,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第2期166-174,共9页
Heat Treatment of Metals
基金
陕西省科技计划项目(2018ZDXM-GY-138)。
关键词
钛合金
TC4ELI
热处理
显微组织
力学性能
弹性模量
相组成
titanium alloy
TC4ELI
heat treatment
microstructure
mechanical properties
elastic modulus
phase composition
作者简介
毛江虹(1974-),高级工程师,硕士,主要研究方向为钛相关技术与工艺,联系电话:029-86962225,E-mail:mjh2323@126.com。
