变形温度对TC18钛合金棒材组织及性能影响

Effect of different deformation temperature on microstructure and properties of TC18 titanium alloy bars

本文对比分析了不同变形温度对TC18钛合金棒材低倍组织、显微组织、室温拉伸及断裂韧性的影响。结果表明,在T_((α-β))-5℃至T_((α-β))+15℃温度范围内加热锻造,可以得到网篮组织的TC18钛合金棒材,随着变形温度降低,晶内存在等轴α相,同时晶界α消失。随着变形温度降低,棒材断裂韧性随变形温度降低而降低,纵、横向室温力学性能在865℃时获得最优匹配。

In this paper,the effects of different deformation temperatures on the macrostructure,microstructure,tensile structure and fracture toughness of TC18 titanium alloy bars were compared and analyzed.The results show that TC18 titanium alloy bars with basket structure can be obtained by heating and forging in the temperature range of T_((α-β))-5℃ to T_((α-β))+15℃,and with the decrease of deformation temperature,equiaxed α phases appear in the crystal,and the grain boundary α disappears.With the decrease of deformation temperature,the fracture toughness of the bar decreases with the decrease of deformation temperature,and the mechanical properties of longitudinal and transverse rooms are optimally matched at 865℃.