Effect of cold rolling and aging on microstructure and properties of novel β-titanium alloys

doi:10.13251/j.issn.0254-6051.2022.11.011

Abstract

Abstract: Microstructure and properties of two new types β-titanium alloys after cold rolling with different deformation and aging at 650 ℃ for different time were studied. The experimental results show that a lot of dislocations, twins and stress-induced martensite transformation are produced and the hardness increases with the increase of reduction of cold rolling. When aged at 650 ℃ for 9 h, the hardness and strength of the β-titanium alloys cold rolled with reduction of 30% and 40% reach the maximum values, which result from a lot of finely dispersed secondary α phase providing effective precipitation strengthening. When aged at 650 ℃ for 6 h and 3 h, respectively, Ti-3573 and Ti-3873 alloys cold rolled with reduction of 50% have more crystal defects due to increased deformation, secondary α phases preferentially nucleate at defects, and the hardness and strength reach the peak values. The mechanical properties of Ti-3873 alloy which is enriched in β-stabilizing elements are better than those of the Ti-3573 alloy.

Key words: β-titanium alloys, cold rolling, aging, secondary α phase, hardness

CLC Number:

TG166.5

Li Jian, Zhuang Yusheng, Li Chunhui, Li Zhuang, Cai Wenhao, Lü Kunqi, Zhang Li. Effect of cold rolling and aging on microstructure and properties of novel β-titanium alloys[J]. Heat Treatment of Metals, 2022, 47(11): 70-75.

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