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研究了不同热处理制度对TB2钛合金板材的显微组织及力学性能的影响,探究能够达到合金强度及塑性综合匹配较好的热处理制度。结果表明:双时效处理后合金晶粒粗大,次生相细小,弥散分布在晶内及晶界处;固溶时效处理后合金晶粒细小,晶内弥散分布着大量纵横交错的针状次生相。室温拉伸结果表明,双时效处理后合金的强度较高,塑性较差,且随时效温度的降低,合金强度提高,塑性降低。固溶时效处理后具有较好的强度与塑性匹配,其中以750℃固溶+510℃时效处理为最优热处理制度。最优条件下,强度达到1125 MPa,伸长率达到15%。双时效处理后室温拉伸断口呈撕裂状脆性断口,固溶时效处理后断口呈韧窝状。
The effects of different heat treatment regimes on the microstructure and mechanical properties of TB2 titanium alloy sheet were investigated. The heat treatment system that could achieve the better matching of alloy strength and plasticity was explored. The results show that after aging treatment, the alloy grains are coarse and the secondary phases are fine and dispersed in the grain boundaries and the grain boundaries. The grain size of the alloys after the solution aging treatment is fine, and the interstitial interstitial grains phase. The results of tensile tests at room temperature show that the alloy has higher strength and poor ductility after double aging treatment. With the decrease of aging temperature, the strength of the alloy increases and the ductility decreases. After solution treatment, the better strength and plasticity match, among them 750 ℃ solution + 510 ℃ aging treatment is the best heat treatment system. Under the optimal conditions, the strength reaches 1125 MPa and the elongation reaches 15%. After double-aging treatment, the tensile fracture at room temperature was tearing fracture, brittle fracture after solution aging treatment.