Effect of grading aging on mechanical properties and  microstructure of TB9 titanium alloy core rod

doi:10.13251/j.issn.0254-6051.2023.12.011

Abstract

Abstract: Mechanical properties and microstructure of a certain type of aerospace TB9 titanium alloy core rod after stepped aging were studied. The results show that the tensile strength and hardness of the TB9 alloy decrease with the increase of aging temperature after single-stage aging at 480-530 ℃ for 6-10 h, and the grain size tends to grow when the aging temperature exceeds 530 ℃. With the increase of aging time, the tensile strength shows an increasing trend at 480 ℃, and the maximum value reaches 1698 MPa. At 530 ℃, the strength shows an obvious downward trend, decreasing by nearly 200 MPa. Short time high temperature treatment before single-stage aging can effectively eliminate or inhibit the formation of brittle phase and uniform structure. At the same time, the tensile force and fracture toughness of the TB9 titanium alloy core rod are improved, so that the comprehensive properties can meet the requirements of high properties β alloy fasteners.

Key words: TB9 titanium alloy, graded aging, core rod, mechanical properties, microstructure

CLC Number:

TG146.2⁺3

Liu Tong, Qi Yue, Gao Wei, Zhou Ying, Sun Hongye. Effect of grading aging on mechanical properties and microstructure of TB9 titanium alloy core rod[J]. Heat Treatment of Metals, 2023, 48(12): 74-78.

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Effect of grading aging on mechanical properties and microstructure of TB9 titanium alloy core rod

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