Effect of solution cooling method on microstructure and mechanical properties of TB15 titanium alloy

doi:10.13251/j.issn.0254-6051.2022.10.026

Abstract

Abstract: Mechanical properties, fracture morphology and microstructure of TB15 titanium alloy after solution treatment at 900 ℃ for 2 h with different cooling methods and aging at 530 ℃ for 8 h were studied by means of scanning electron microscopy, tensile and fracture toughness tests. The results show that cooling method of solution treatment significantly affects the strength and ductility of TB15 titanium alloy, but the effect on fracture toughness is not obvious. When using 0.1 MPa argon vacuum quenching, the comprehensive mechanical properties of the TB15 titanium alloy after solution and aging is the best, as the tensile strength is 1391 MPa, the elongation is 7.0%, the percentage reduction of area is 13.6%, and the fracture toughness is 70.3 MPa·m^1/2. With the increase of solution cooling rate, the fracture toughness of the TB15 titanium alloy gradually decreases, but its varied range is not large. Under different solution cooling methods, the number, thickness and lamellar spacing of secondary α phase in TB15 titanium alloy after solution and aging are different. Compared with air cooling, the number and thickness of the lamellar secondary α phase increase when using 0.1 MPa argon vacuum quenching.

Key words: solid solution, cooling method, TB15 titanium alloy, mechanical properties, microstructure

CLC Number:

TG146.22

Hu Shengshuang, Xiao Jun, Zhao Hu, Jiang Yi, Wu Haifeng, Zhang Bingxian, Yan Jiawei. Effect of solution cooling method on microstructure and mechanical properties of TB15 titanium alloy[J]. Heat Treatment of Metals, 2022, 47(10): 160-163.

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