Effect of electropulse shocking treatment on microstructure and properties of TC11 titanium alloy

doi:10.13251/j.issn.0254-6051.2020.12.006

Abstract

Abstract: Effect of electropulse shocking treatment(EST) on microstructure and mechanical properties of TC11 titanium alloy was studied by means of metallographic microscope, scanning electron microscope, X-ray diffractometer, universal material testing machine and microhardness tester. The results show that the ratio of α phase in the microstructure of TC11 titanium alloy, the lath size of β transformation structure and residual compressive stress are significantly affected by different pulse numbers. With the increase of EST pulse number, the content of α phase and the content of secondary α phase in lath like β transformation structure increase firstly and then decrease. After treated by the ETC with the best process parameters (900 A, 50 Hz, 25 pulses), the α phase in the TC11 titanium alloy is fine and uniform, and the length, thickness and spacing of β transformation lath are reduced by 51.9%, 58.0% and 36.8%, respectively, compared with those before treatment. At this time, the mechanical properties of TC11 titanium alloy are improved most obviously: elongation increased by 12.7%, microhardness increased by 4.7%, and residual compressive stress increased by 48.4%.

Key words: electropulse-shocking, TC11 titanium alloy, microstructure, mechanical properties

CLC Number:

TG166.5

Wang Zhongqi, Song Yanli, Hua Lin, Yu Yongqing. Effect of electropulse shocking treatment on microstructure and properties of TC11 titanium alloy[J]. Heat Treatment of Metals, 2020, 45(12): 29-35.

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