热处理温度对TC4ELI合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.02.032

摘要/Abstract

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 ℃。

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

Abstract:

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 TC4ELI 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 ℃.

Key words: titanium alloy, TC4ELI, heat treatment, microstructure, mechanical properties, elastic modulus, phase composition

中图分类号:

TG146.2⁺3

毛江虹, 杨晓康, 罗斌莉, 魏芬绒. 热处理温度对TC4ELI合金组织与性能的影响[J]. 金属热处理, 2020, 45(2): 166-174.

Mao Jianghong, Yang Xiaokang, Luo Binli, Wei Fenrong. Effect of heat treatment temperature on microstructure and mechanical properties of TC4ELI alloy[J]. HTM, 2020, 45(2): 166-174.

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