热处理温度对TA15钛合金板材组织及性能的影响

Effect of Heat Treatment on Microstructure and Mechanical Properties of TA15 Titanium Alloy Sheets

本研究对冷加工态TA15钛合金板材进行了750℃、800℃、850℃和900℃四种温度的热处理,并深入探讨了处理后的显微组织、室温拉伸性能、弯曲性能、洛氏硬度和高温性能。结果显示,在750℃时,板材的横向为等轴组织,纵向含有少量拉长组织;而在800℃至900℃范围内,板材的横向和纵向均形成了均匀细小的等轴组织。随着热处理温度从750℃升至850℃,板材的拉伸强度逐渐降低,而伸长率、弯曲角度则有所增加,洛氏硬度逐渐下降。值得注意的是,800℃至850℃热处理的板材显示出优异的综合性能,特别是850℃热处理的板材已完全再结晶。因此,建议TA15钛合金冷轧板材在这个温度范围内进行热处理,以获得最佳的显微结构和力学性能。

In this study,cold-worked TA15 titanium alloy sheets were heat-treated at four temperatures:750℃,800℃,850℃,and 900℃,and the microstructure,room temperature tensile properties,bending properties,Rockwell hardness,and high-temperature performance after treatment were explored in depth.The results showed that at 750℃,the crosssection of the sheet exhibited an equiaxial structure,while the longitudinal section contained a small amount of elongated structure;however,within the temperature range of 800℃to 900℃,both the cross-section and longitudinal section of the sheet formed a uniform and fine equiaxial structure.As the heat treatment temperature increased from 750℃to 850℃,the tensile strength of the sheet gradually decreased,while the elongation and bending angle increased,and the Rockwell hardness gradually decreased.It's worth noting that the sheets heat-treated at 800℃to 850℃exhibited excellent overall performance,especially those heat-treated at 850℃which had completely recrystallized.Therefore,it is recommended that TA15 titanium alloy cold-rolled sheets be heat-treated within this temperature range to achieve the best microstructure and mechanical properties.