Q值对Gr.9钛合金冷轧管材组织及性能的影响

Effect of Q Parameter on Microstructure and Properties of the Cold-rolled Gr.9 Titanium Alloy Tubes

通过调整冷轧过程中的工艺参数,研究了不同Q值对小规格Gr.9钛合金管材组织和力学性能的影响。结果表明：轧制Q值对管材组织及性能的影响较大,通过合理控制轧制Q值可获得综合性能良好的Gr.9管材。对于小规格Gr.9管材,Q值越大,晶粒破碎越充分、均匀,晶粒纤维化和取向性越明显,当Q值在1.86~2.62范围内时,冷轧态管材强、塑性较好,退火后晶粒尺寸较小;当Q值在1.86~2.24范围内时,管材扩口性能优越,Q值过大或过小均不利于小规格管材扩口。此外,Q值会影响冷加工过程中晶粒的均匀度及织构分布,可通过将Q值控制在1.54~2.46使得CSR在1.3~2.5范围内,从而得到综合性能良好的Gr.9钛合金管材。

The effect of Q parameter on the microstructure and mechanical properties of small size Gr. 9 titanium alloy tubes was investigated by adjusting the parameters among cold rolling process. The results show that Q parameter has a great effect on the microstructure and properties of small size Gr. 9 tubes. The higher Q parameter, the more fully and uniform grain breaks, the more obvious the grain fibrosis and orientation. The stength-ductility for cold-rolled tubes is better and the grain size after annealing is smaller when the Q parameter controlled in 1.86 - 2.62. It is not conductive to the expanding of the tubes when the Q parameter is too large or too small, the expangding performs more superior as the Q is in range of 1.86 -2.24. The Q parameter influences the grains uniformity and texture distribution. By adjusting Q parameter in the range of 1.54 - 2. 46 with the purpose of making CSR in the range of 1.3 - 2. 5, we can obtain Gr. 9 titanium alloy tubes with excellent comprehensive properties.