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对Mg-3Sn合金棒材的挤压工艺进行了数值模拟,通过改变挤压比、挤压温度和挤压速度的方法优化了挤压工艺,并在优化工艺参数下进行了Mg-3Sn合金棒材的挤压加工。结果表明,Mg-3Sn合金棒材的最佳挤压比为21,挤压温度为380℃,挤压速度为3 mm/s。优化工艺下的挤压棒材晶粒组织已经得到细化,且有变形挛晶和等轴晶产生,组织较为致密,未见孔洞、挤压变形层等缺陷,棒材的抗拉强度和屈服强度都有较大幅度的提高,而断后伸长率略有降低或者基本不变。Mg-3Sn合金棒材的挤压工艺数值模拟结果与试验结果较为一致。
The extrusion process of Mg-3Sn alloy bar was numerically simulated. The extrusion process was optimized by changing the extrusion ratio, extrusion temperature and extrusion speed. The optimum conditions of Mg-3Sn alloy bar Material extrusion processing. The results show that the optimum extrusion ratio of Mg-3Sn alloy bar is 21, the extrusion temperature is 380 ℃ and the extrusion speed is 3 mm / s. The grain structure of the extruded bar under the optimized process has been refined, and the deformed tetrapods and equiaxed grains are produced. The microstructure is relatively compact with no defects such as holes and extrusion deformation layers. The tensile strength and yielding of the bar The strength has a more substantial increase, while the elongation after the break slightly reduced or basically unchanged. Mg-3Sn alloy bar extrusion process numerical simulation results and the test results are more consistent.