双级时效工艺对低压铸造A356合金轮毂力学性能的影响  

Research of new heat treatment technology for motor high properties aluminum alloy cast wheel

作　　者：陈旷[1] 关绍康[1] 胡保健 马力[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002 [2]三门峡戴卡轮毂制造有限公司,河南三门峡472000

出　　处：《轻合金加工技术》2006年第4期44-47,共4页Light Alloy Fabrication Technology

摘　　要：研究了双级时效工艺对A356铝合金低压铸造轮毂力学性能的影响。结果表明,预时效温度100℃~120℃,预时效时间12 h^14 h使合金的抗拉强度由原来的280 N/mm2提高到308 N/mm2,提高幅度10%;屈服强度由180N/mm2提高到248 N/mm2,提高幅度38%;伸长率在8%以上,最高达到13.5%。该性能达到了ASTM锻造6061-T6合金轮毂的标准,与ZL107液态模锻铝合金轮毂的力学性能相当,接近或达到普通锻件力学性能的要求。研究认为,双级时效工艺引起合金-αAl的晶格常数增大,Si相和Mg2Si相析出量增加是合金强度增加的主要原因。The effects of double aging on mechanical properties of low pressure casting aluminum alloy wheel were studied. It was found that, the pre-aging temperature at 100℃ - 120℃ and the time kept on 12 h- 14 h could make the tensile strength increased from former 280 N/mm^2 to 308 N/mm^2, the increasing ratio was 10%, the yield strength from 180 N/mm^2 to 248 N/mm^2, the increasing ratio was 38%; the elongation was over 8%, the highest reaches to 13.5%, the new mechanical properties meet to the ASFM standard of forging aluminum alloy wheel of 6061 with T6 heattreatment and are almost as the same as the level of liquid forging aluminum alloy wheel of ZL107 with T6 heattreatment, it is closed to or ,reaches the mechanical properties of traditional forging. The research thinks that the double aging increases the α-Al crystal lattiee parameters of A356, the increasing amount Si and Mg2Si separated from α-Al is the main reason which contributes to the increasing of mechanical properties.

关 键 词：双级时效 A356铝合金 轮毂 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]