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通过选择不同的挤压温度、挤压比和挤压速度,研究了挤压温度、挤压比和挤压速度对Gr.38钛合金管材组织和性能的影响。结果表明,当挤压温度、挤压比或挤压速度提高时,α相的含量降低,初生α相再结晶更充分,从扭曲拉长的形态逐步转变为球状,同时合金的强度均略微下降,塑性则略微上升。这是因为合金内部聚集的变形热和变形储能越来越多,发生了动态回复和再结晶。获得了Gr.38钛合金的优化挤压工艺参数:挤压温度为900~930℃,挤压比为14~18,挤压速度为70~80mm/s。
By selecting different extrusion temperature, extrusion ratio and extrusion speed, the effects of extrusion temperature, extrusion ratio and extrusion speed on the microstructure and properties of Gr. 38 titanium alloy pipe were studied. The results show that when the extrusion temperature, extrusion ratio or extrusion speed increase, the content of α phase decreases, the recrystallization of primary α phase becomes more fully, and the morphology gradually changes from distorted to spherical, and the strength of the alloy decreases slightly Plasticity is slightly higher. This is because the alloy internal deformation heat and deformation energy storage more and more dynamic recovery and recrystallization. The optimized extrusion process parameters of Gr. 38 titanium alloy were obtained: extrusion temperature of 900 ~ 930 ℃, extrusion ratio of 14 ~ 18 and extrusion speed of 70 ~ 80mm / s.