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通过试制不同规格的TA18实验管材,研究Q值、累积变形率以及退火温度对成品管的显微组织和力学性能的影响。结果表明:当变形率不大于55%,且Q值控制在0.53～1.14时,管材可顺利实现两辊轧制而不出现裂纹。随着变形率的增大,实验管材加工态的强度逐渐升高,塑性下降,但较小的变形率对塑性影响不大。随着退火温度的升高,管材的强度降低,塑性改善,加工硬化效应逐渐消除。另外,过小的变形率会造成管材的再结晶晶粒尺寸分布不均,进而导致塑性较低。经工艺优化,TA18实验管材的力学性能可达:UTS=920MPa,YS=755MPa,El=14%。
Through the trial production of TA18 experimental pipe with different specifications, the effects of Q value, cumulative deformation rate and annealing temperature on the microstructure and mechanical properties of the finished pipe were studied. The results show that when the deformation rate is less than 55% and the Q value is controlled at 0.53 ~ 1.14, the pipe can be rolled smoothly without cracking. With the increase of deformation rate, the strength of experimental pipe processing state gradually increased, the plasticity decreased, but the small deformation rate had little effect on plasticity. As the annealing temperature increases, the strength of the pipe decreases, the plasticity improves, and the work hardening effect is gradually eliminated. In addition, too small a deformation rate will cause the pipe recrystallization grain size distribution unevenness, which in turn leads to lower plasticity. The process optimization, TA18 experimental pipe up to mechanical properties: UTS = 920MPa, YS = 755MPa, El = 14%.