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无缝TA18钛合金管材的制备通常要经历大变形量的冷轧工艺,不可避免地引入残余应力。本实验利用X射线残余应力测试技术,对不同工艺条件制备的TA18(Ti-3Al-2.5V)合金多种规格冷轧管材外表面的残余应力进行了测试,并对比了管材切向残余应力的差别,针对其差别讨论了可能产生的原因。结果表明,工艺不当会导致钛合金管材在切向呈现拉应力,而适宜的工艺则在钛合金管材的切向形成压应力。残余拉应力显著地降低材料的应力腐蚀抗力和疲劳抗力,而残余压应力却可以不同程度地提高材料的疲劳寿命。因此,对比实验数据可以得出,TA18管材需要稳定制备工艺,从而达到残余压应力的应力状态,才能拥有更好的服役性能。
The preparation of seamless TA18 titanium alloy pipe usually undergoes a large amount of cold rolling process and inevitably introduces residual stress. In this experiment, the residual stress of the external surface of a variety of cold-rolled pipe of TA18 (Ti-3Al-2.5V) alloy prepared under different process conditions was tested by X-ray residual stress testing technology, and compared with the tangential residual stress of the pipe Differences, in view of the differences discussed the possible causes. The results show that improper technology will lead to tensile stress in the tangential direction of the titanium alloy pipe, and the suitable process will form the compressive stress in the tangential direction of the titanium alloy pipe. Residual tensile stress significantly reduces the material’s stress corrosion resistance and fatigue resistance, while the residual compressive stress can improve the fatigue life of the material to varying degrees. Therefore, comparing the experimental data can be drawn, TA18 pipe need stable preparation process, so as to achieve the residual compressive stress state, in order to have better service performance.