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选择同样规格管坯进行了:①变形量ε分别为15%,28%,34%,40%的冷轧变形实验;②Q值为0.86,1.15,2.62的冷轧变形实验;③加热温度分别为680,715,730,820℃,均保温1h的中间退火实验;④5种热处理工艺制度实验;⑤冷轧和拉拔2种不同加工方式实验。实验后用10%HF+30%HNO3+60%H2O酸洗液对管材表面进行处理,之后测试管材的力学性能。结果表明,该合金的变形量(ε)应选在30%～35%之间,Q值控制在2以下;中间退火温度应选在相变点以上,此时可获得最高的合金塑性,具有优良的冷加工性能;最终热处理应先在750℃固溶处理,然后再在510℃时效处理4h可以得到塑性和强度匹配良好的管材。另外,采用轧制方法生产出的管材强度较高,塑性较低,表质量好,而采用拉拔方法生产出的管材塑性较高,强度略低,表面光洁度差。
Select the same specifications of the tube were: ① deformation ε were 15%, 28%, 34%, 40% of the cold rolling deformation experiment; ② Q value of 0.86,1.15,2.62 cold rolling deformation experiments; ③ heating temperature 680,715,730,820 ℃, were incubated for 1h intermediate annealing experiments; ④ 5 kinds of heat treatment process system experiments; ⑤ cold-drawn and drawn two different processing methods experiments. After the experiment, the pipe surface was treated with 10% HF + 30% HNO3 + 60% H2O pickling solution, and then the mechanical properties of the pipe were tested. The results show that the deformation (ε) should be between 30% and 35%, the Q value should be below 2, the intermediate annealing temperature should be above the transformation point, and the highest plasticity of the alloy can be obtained. Good cold workability; the final heat treatment should be first solution treatment at 750 ℃, and then aging at 510 ℃ for 4h can be plastic and strength matched well pipe. In addition, the use of rolling method to produce a higher strength pipe, low plasticity, table quality is good, and the use of drawing pipe produced by the higher plasticity, strength slightly lower, poor surface finish.