Effect of Heat Treatment Temperature and Cooling Methods on Microstructure and Tensile Properties of TA15 Titanium Alloy AITranslate

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Chinese Library Classification Number:TG156.1[金属学及工艺]

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TA15 titanium alloy was selected as the experimental material,and the alloy was heat treated at different temperatures and cooled in different ways.The effects of heat treatment temperature and cooling methods on the microstructure and tensile properties of the alloy were studied.The results show that when the heat treatment temperature is 970℃(inα+βtwo-phase zone),the microstructure presents T-type texture,the alloy after water cooling or air cooling treatment is(α+β)two-phase structure,and there is a finer needle-likeαphase in the microstructure after water cooling.When the heat treatment temperature is 1000℃(inβzone),the microstructure shows R-type texture.This microstructure shows fine lamellar morphology after water cooling or air cooling treatment,and the primaryαphase disappears completely.α'phase is formed in the microstructure after water cooling treatment,whileαphase is formed in the microstructure after air cooling treatment.Regardless of the heat treatment temperature range,the strength of the alloy after water cooling is higher than that after air cooling.When the cooling methods are the same,compared with the(α+β)zone,the strength of the alloy is improved when the heat treatment temperature is inβzone,but the plasticity is significantly reduced.Regardless of the cooling method,the tensile fracture morphology of the alloy after heat treatment at the(α+β)zone temperature is composed of dimples.The tensile fracture after heat treatment at theβzone temperature is mainly coarse rock morphology,along with tear ridges and small shallow dimples.