冷轧Ti-3.5Al-5Mo-4V合金板材再结晶晶粒长大行为及其对时效行为的影响

doi:10.13251/j.issn.0254-6051.2024.07.010

摘要/Abstract

摘要： 采用X射线衍射仪、光学显微镜、扫描电镜等研究了冷轧Ti-3.5Al-5Mo-4V合金板材在800~1020 ℃退火15 min时的再结晶晶粒长大行为,同时分析了晶粒尺寸对力学性能及时效析出的影响。结果表明:随着退火温度升高,晶粒快速长大,合金室温抗拉强度和延伸率均降低;晶粒长大的激活能为84.949 kJ/mol,晶粒尺寸与温度之间的关系为D=400 312exp(-84 949/RT)。冷轧板材经800 ℃退火+500 ℃时效8 h后的组织为细小等轴β晶粒上均匀分布着针状次生α相,抗拉强度达到1530.0 MPa的同时,延伸率保持在5.5%。

关键词: Ti-3.5Al-5Mo-4V合金, 热处理, 晶粒长大, 时效, 力学性能

Abstract: Recrystallized grain growth behavior of the cold-rolled Ti-3.5Al-5Mo-4V alloy after annealing at 800-1020 ℃ for 15 min was studied by means of X-ray diffractometer, optical microscope and scanning electron microscope. The effects of grain size on mechanical properties and aging precipitation were also investigated. The results show that with the increase of annealing temperature, the grains grow rapidly, and the tensile strength and elongation of the alloy at room temperature decrease. The activation energy of grain growth is 84.949 kJ/mol, and the relationship between grain size and temperature is D=400 312exp(-84 949/RT). After annealing at 800 ℃ and aging at 500 ℃ for 8 h, the microstructure of the cold-rolled sheet is fine equiaxed β grains uniformly distributed with needle-like secondary α phase. The tensile strength of the alloy reaches 1530.0 MPa, while the elongation remains 5.5%.

Key words: Ti-3.5Al-5Mo-4V alloy, heat treatment, grain growth, aging, mechanical properties

中图分类号:

TG156.92

冀宣名. 冷轧Ti-3.5Al-5Mo-4V合金板材再结晶晶粒长大行为及其对时效行为的影响[J]. 金属热处理, 2024, 49(7): 63-69.

Ji Xuanming. Recrystallized grain growth behavior and its effect on aging behavior of cold-rolled Ti-3.5Al-5Mo-4V alloy sheet[J]. Heat Treatment of Metals, 2024, 49(7): 63-69.

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