热处理工艺对TC4钛合金冲击磨损性能的影响

doi:10.13251/j.issn.0254-6051.2020.06.002

摘要/Abstract

摘要： 研究了退火和固溶时效处理对热轧态TC4钛合金的力学性能和组织的影响,并考察了其冲击磨损性能。结果表明:退火处理后试样组织中转变β相增加,强度、塑性和韧性均较热轧态有所提升;而固溶时效处理后试样组织的晶粒细化且尺寸更为均匀,同时具有最高的强度,而塑性和韧性则较热轧态有所降低。经过10 h的冲击磨损试验后,退火态试样的磨损率最低,而固溶时效态试样的磨损率最高。通过磨损断口观察发现退火态试样表面冲刷犁沟较短,且终点处存在合金的塑性堆积,同时磨损面组织发生塑性变形,晶粒延展拉长。退火态试样较高的塑性和韧性有助于吸收冲击能量,因此表现出较好的耐冲击磨损性能。

关键词: TC4钛合金, 热处理, 冲击磨损, 塑性变形

Abstract: Hot rolled TC4 titanium alloy was annealed and solution treated+aged, respectively, the influence of different heat treatment processes on the mechanical properties and microstructure, as well as the impact wear resistance was studied. The results show that transformed β phase increases, and all of the strength, elongation and toughness are improved after annealing. As for the solution treated+aged specimen, the grain becomes finer and more homogeneous due to recrystallization, its strength is the highest but its elongation and toughness are lower than that of the hot rolled one. The annealed specimen has the lowest wear rate while the solution treated+aged specimen has the highest after 10 h impact wear experiment. Viewing from the fractography, the microcutting length on the annealed specimen is shorter, plastic stacking is observed at the end of microcutting, and the microstructure near wear surface is stretched plasticly. The better impact wear resistance of the annealed specimen can be attributed to its higher plasticity and toughness, which can absorb higher impact energy.

Key words: TC4 titanium alloy, heat treatment, impact wear, plastic deformation

中图分类号:

TG142

尉文超, 李云坤, 薛彦均, 孙挺, 时捷. 热处理工艺对TC4钛合金冲击磨损性能的影响[J]. 金属热处理, 2020, 45(6): 7-11.

Yu Wenchao, Li Yunkun, Xue Yanjun, Sun Ting, Shi Jie. Influence of heat treatment on impact wear resistance of TC4 titanium alloy[J]. Heat Treatment of Metals, 2020, 45(6): 7-11.

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