Effect of cold rolling pretreatment on microstructure of TC4 alloy nitrided at 540 ℃

doi:10.13251/j.issn.0254-6051.2020.08.039

Abstract

Abstract: TC4 titanium alloy was solution treated at 820 ℃ and cold rolled at room temperature to obtain specimens with different deformation of 10%, 20%, 30%, 40%, 50%, and then nitrided and aged simultaneously at 540 ℃ for 8 h. The change of nitrided microstructure and aged microstructure with different deformation amounts and the change of phase structure and morphology of the nitrided specimen surface were analyzed by means of metallographic microscope, X-ray diffractometer, scanning electron microscope (SEM). The results show that after nitriding treatment, high-hardness nitride particles such as TiN and Ti₂N are formed on the surface of TC4 alloy, and the larger the amount of deformation, the more nitride particles with larger size are formed on the specimen surface. After solution treatment, the microstructure of the TC4 alloy is α phase+metastable β phase. After nitriding, the metastable β phase decomposes into α phase, while α phase transforms into β phase, and the larger the amount of deformation, the more β phase precipitates, but this phenomenon is not as obvious as that only aged.

Key words: TC4 alloy, cold rolling deformation, aging, nitriding, microstructure

CLC Number:

TG156.82

Leng Ke, Feng Xiaoxue, Yan Feng, Fu Yudong. Effect of cold rolling pretreatment on microstructure of TC4 alloy nitrided at 540 ℃[J]. Heat Treatment of Metals, 2020, 45(8): 199-202.

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