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对变形镁合金ZK60管材挤压成形进行了试验研究,分析了工艺参数对其微观组织的影响规律。结果表明,ZK60镁合金管材热挤压时的合理工艺参数范围是凹模锥半角为70°,坯料温度为300～360℃,模具预热温度为270～330℃,挤压速度为1.5mm/s,润滑剂采用动物油。增大挤压速度和降低挤压温度都有利于管材件的晶粒细化,但挤压力随之增大。在坯料温度相同的情况下,等温挤压的挤压力比差温挤压降低20%左右。当坯料温度在300～360℃时,ZK60镁合金发生了动态再结晶,晶粒较小且组织均匀,晶粒尺寸比原始组织细化了约40%。
The deformation and deformation of magnesium alloy ZK60 pipe extrusion was studied, the influence of process parameters on the microstructure was analyzed. The results show that the reasonable processing parameters of ZK60 magnesium alloy pipe during hot extrusion are: 70 ° for the die cone, 300-360 ° C for the billet, 270-330 ° C for the die, and 1.5 mm / s, lubricants using animal oil. Increase the extrusion speed and reduce the extrusion temperature are conducive to the pipe grain refinement, but the extrusion pressure increases. In the case of the same billet temperature, extrusion pressure isothermal extrusion is about 20% lower than the differential temperature extrusion. When the billet temperature is in the range of 300 ~ 360 ℃, the dynamic recrystallization of ZK60 magnesium alloy occurs. The grain size is small and uniform, and the grain size is 40% smaller than the original structure.