含钛高强镁合金Mg-8Gd-1.5Y-0.8Ti的锻造成形工艺分析

Analysis of Forging Forming Process for High Strength Magnesium Alloys Mg-8Gd-1.5Y-1M Containing Ti

采用不同的始锻温度、终锻温度和锻造速度对汽车用含钛高强镁合金Mg-8Gd-1.5Y-0.8Ti试样进行了锻造成型试验,并进行了力学性能的测试与分析。结果表明:适当地提高始锻温度、终锻温度和锻造速度有助于力学性能的提升。汽车用含钛高强镁合金Mg-8Gd-1.5Y-0.8Ti在440℃始锻温度、350℃终锻温度、12 mm/min锻造速度下的抗拉强度和屈服强度最高,试样的韧窝尺寸最小、深度最深,且断口表现为穿晶断裂,韧性最好,力学性能最佳,较380℃始锻锻造时各提高了51、53 MPa;较290℃终锻锻造时各提高了46、49 MPa;较4 mm/min速度锻造时各提高了39、37 MPa。汽车用含钛高强镁合金Mg-8Gd-1.5Y-0.8Ti试样的锻造工艺参数优选为:440℃始锻温度、350℃终锻温度、12 mm/min锻造速度。

The forging tests of Mg-8 Gd-1.5 Y-0.8 Ti high-strength magnesium alloy samples containing Ti were carried out with different initial forging temperature,final forging temperature and forging speed.The mechanical properties of obtained alloys were tested and analyzed.The results show that proper increasing of the initial forging temperature,final forging temperature and forging speed contribute to the improvement of mechanical properties.Mg-8 Gd-1.5 Y-0.8 Ti magnesium alloy containing Ti has the highest tensile strength and yield strength at initial forging temperature of 440℃,final forging temperature of 350℃and forging speed of 12 mm/min.The tensile strength and yield strength were respectively increased by 51 MPa and 53 MPa compared with those forged at the initial forging temperature of 380℃,increased by 46 MPa and 49 MPa respectively at final forging temperature of 290℃,and increased by 39 MPa and 37 MPa compared with those forged at 4 mm/min.Thus it is proposed that the best forging process parameters of the Mg-8 Gd-1.5 Y-0.8 Ti high-strength magnesium alloy samples containing Ti are as following:initial forging temperature of 440℃,final forging temperature of 350℃,and forging speed of 12 mm/min.