采用XRD, SEM和TEM研究了TC16钛合金在700-900℃固溶后淬火的显微组织和相组成, 以及淬火温度对拉伸性能的影响. 结果表明, 在700和750℃淬火, TC16钛合金由初生α相、亚稳β相和微量ω相组成; 随着淬火温度的升高, 合金出现了β→α''的马氏体相变; 从β单相区淬火,合金由α''马氏体组成. 拉伸实验表明, 拉伸过程中亚稳组织试样出现应力诱发α''马氏体相转变, 导致屈服强度降低.
The evolution of microstructure and phase transformation in TC16 titanium alloy after solution and then quenching from 700 ℃ to 900℃ were investigated by XRD, SEM and TEM, and the corresponding tensile properties were also measured. The results reveal that TC16 titanium alloy consists of primary α phase, metastable β phase and small amount of ω phase when quenching at 700 and 750 ℃. With quenching temperature increasing, the phase transformation of β → α'' happens. The alloy is completely composed of α'' martensite when quenching from single β phase field. Tensile test shows the yield strength of metastable microstructure samples is lowered due to stress induced α'' martensitic transformation.
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