浇注温度对汽车用含锰高强镁合金铸态性能的影响
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摘要
采用不同的浇注温度对汽车用Mg-8Al-1. 5Mn-0. 3Ce含锰高强镁合金进行了铸造试验,观察了铸造试样的显微组织,测试了其力学性能。结果表明:随浇注温度从630℃提高至730℃,试样的显微组织改善和力学性能均先提高后下降。与630℃相比,采用690℃浇注试样的平均晶粒尺寸减小40%,抗拉强度和屈服强度分别增大18%和22%,伸长率减小12%。Mg-8Al-1. 5Mn-0. 3Ce合金铸件的浇注温度优选为690℃。
The casting test of Mg-8 Al-1. 5 Mn-0. 3 Ce high-strength manganese-containing magnesium alloy was carried out with different pouring temperatures. The microstructure was analyzed and the mechanical properties were tested for casting samples. The results show that with the pouring temperature increasing from 630℃ to 730℃,the microstructure and mechanical properties of the samples increase first and then decrease. Compared with the sample cast at 630℃,the average grain size of the sample obtained by casting at 690℃ decreases by 40%,the tensile strength and yield strength increase by 18% and 22%,respectively,and the post-fracture elongation decreases by 12%. The pouring temperature of Mg-8 Al-1. 5 Mn-0. 3 Ce alloy is preferably at 690℃.
The casting test of Mg-8 Al-1. 5 Mn-0. 3 Ce high-strength manganese-containing magnesium alloy was carried out with different pouring temperatures. The microstructure was analyzed and the mechanical properties were tested for casting samples. The results show that with the pouring temperature increasing from 630℃ to 730℃,the microstructure and mechanical properties of the samples increase first and then decrease. Compared with the sample cast at 630℃,the average grain size of the sample obtained by casting at 690℃ decreases by 40%,the tensile strength and yield strength increase by 18% and 22%,respectively,and the post-fracture elongation decreases by 12%. The pouring temperature of Mg-8 Al-1. 5 Mn-0. 3 Ce alloy is preferably at 690℃.
引文
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[9]穆桐,孙镇,邓子玉等. Mn对Mg-5Sn-2Al-Zn合金组织及力学性能的影响[J].沈阳理工大学学报,2017,36(3):27-31,110.
[2]金霄,汤梓铭.车用镁合金性能对汽车轻量化发展的影响[J].新技术新工艺,2015(11):100-103.
[3]柳百成,熊守美.汽车工业镁合金压铸成形技术及模拟仿真[J].汽车安全与节能学报,2011,02(1):1-11.
[4]刘倩,单忠德.镁合金在汽车工业中的应用现状与发展趋势[J].铸造技术,2007,28(12):1668-1671.
[5]罗爱华,ANIL K Sachdev,BOB R Powell,等.汽车轻量化先进铸造技术[J].铸造,2011,60(2):113-119.
[6]殷银银,杨永顺,郭俊卿.镁合金轮毂的塑性成形技术[J].热加工工艺,2010(7):77-79.
[7]郑菲,项俊锋.高强镁合金的纳米金属改性研究[J].功能材料,2015(8):8108-8112.
[8]杨玲. Mg-Zn-RE准晶中间合金的制备及挤压铸造准晶增强镁基复合材料研究[D].太原:中北大学,2014.
[9]穆桐,孙镇,邓子玉等. Mn对Mg-5Sn-2Al-Zn合金组织及力学性能的影响[J].沈阳理工大学学报,2017,36(3):27-31,110.