变形量对TA18钛合金微观组织和性能的影响

Effect of compression deformation on the microstructure and properties of TA18 titanium alloy

针对经精锻和热轧两种工艺加工后的近α型TA18钛合金棒材进行了压缩变形量为10%、20%、30%、50%和70%的压缩试验,之后进行了510℃×2 h/AC的退火处理,利用金相显微镜观察并分析了压缩变形量对TA18钛合金微观组织和力学性能的影响。结果表明,经过精锻和热轧后的TA18钛合金棒材分别经过压缩变形量为10%、20%和30%的压缩试验后均可以得到均匀的显微组织,且精锻棒材的力学性能与热轧棒基本一致,在压缩变形量为30%时压缩强度达到最大。退火处理后,压缩后的棒材的晶粒尺寸和分布仍相对均匀,且经过退火处理后的精锻棒材其微观组织更为均匀。

In the present study,the compression experiments with compression deformation of 10%,20%,30%,50%and 70%were carried out for the nearlyαtype TA18 titanium alloy bars after radial precision forging and hot rolling.The bars were subsequently annealed for 2 hours at 510℃.The influence of compression deformation on the microstructure and mechanical properties was investigated by metallographic microscopy.It is found that the radial precision forged and hot rolled TA18 alloy bars can achieve uniform microstructure after compress experiments with compression deformation of 10%,20%,30%.The mechanical properties of the alloy bars after radial precision forging and hot rolling keep basically consistent and the compressive strength gets a maximum value at the compression deformation of 30%.The grain size and distribution of the compressed alloy bars are still relatively uniform after annealing at 510℃for 2 hours.After annealing,the microstructure of the compressed radial precision forging bar is more uniform.