热处理工艺对汽车轮辋性能的影响
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摘要
为了提高A356铝合金汽车轮辋的力学性能和耐腐蚀性能,本文采用不同的工艺对A356铝合金汽车轮辋进行了热处理,并进行了拉伸、冲击和腐蚀试验。结果表明:与常规热处理相比,采用分级淬火或者分级时效,尤其是复合使用分级淬火和分级时效可显著提高汽车轮辋的力学性能和耐腐蚀性能;采用分级淬火+分级时效轮辋的抗拉强度增加54 MPa、屈服强度增加74 MPa,断后伸长率增加7.8%,冲击韧性增加16.9 J/cm~2,腐蚀电位正移407 mV。
In order to improve the mechanical properties and corrosion resistance of A356 aluminum alloy automobile wheel rim, heat treatment of A356 aluminum alloy automobile wheel rim was carried out by different process. Tensile, impact and corrosion test were carried out. The results show that compared with conventional heat treatment, the mechanical properties and corrosion resistance of the automobile wheel rim can be significantly improved by using step quenching or step aging, especially step quenching + step aging; using step quenching +step aging the tensile strength, yield strength, elongation and impact toughness of the wheel rim increase by 54 MPa, 74 MPa, 7.8% and 16.9 J/cm~2, respectively, and the corrosion potential shifts positively by 407 mV.
In order to improve the mechanical properties and corrosion resistance of A356 aluminum alloy automobile wheel rim, heat treatment of A356 aluminum alloy automobile wheel rim was carried out by different process. Tensile, impact and corrosion test were carried out. The results show that compared with conventional heat treatment, the mechanical properties and corrosion resistance of the automobile wheel rim can be significantly improved by using step quenching or step aging, especially step quenching + step aging; using step quenching +step aging the tensile strength, yield strength, elongation and impact toughness of the wheel rim increase by 54 MPa, 74 MPa, 7.8% and 16.9 J/cm~2, respectively, and the corrosion potential shifts positively by 407 mV.
引文
[1]张亮,王志峰,贾晓飞,等.A356.2铝合金轮毂轮辋的缩松分析及性能研究[J].热加工工艺,2010,39(23):84-87.
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[6]张峦,王爱香,顾敏,等.17 Cr Ni Mo6钢渗碳齿轮的盐浴分级淬火与油淬工艺[J].金属热处理,2016(2):146-149.
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[9]柳瑞清,刘凯,谢水生,等.分级时效对热轧态C194合金性能的影响[J].稀有金属,2006,30(z2):155-157.
[2]田建松,李建国,史子木,等.A356铝合金轮毂中轮辋缩松的形成机理及防止措施[J].特种铸造及有色合金,2005(z1):11-12.
[3]王慧玲,于忠奇,李淑慧,等.轮辋辊压成形过程的有限元模拟[J].机械设计与研究,2008,24(6):85-88.
[4]米国发,刘彦磊,张斌,等.夹杂物对轮辋裂纹萌生的影响[J].铁道学报,2010,32(4):108-113.
[5]张立娟.热旋压对铝车轮轮辋性能影响的试验研究[J].制造技术与机床,2012(7):84-87.
[6]张峦,王爱香,顾敏,等.17 Cr Ni Mo6钢渗碳齿轮的盐浴分级淬火与油淬工艺[J].金属热处理,2016(2):146-149.
[7]许以阳,邓洁,葛涵清,等.分级淬火热处理双相钢在拉伸变形时的应变分配[J].机械工程材料,2015,39(6):40-47.
[8]陈希原,曾国屏.分级淬火油用于齿轮碳氮共渗的淬火[J].热处理技术与装备,2010,31(6):18-22.
[9]柳瑞清,刘凯,谢水生,等.分级时效对热轧态C194合金性能的影响[J].稀有金属,2006,30(z2):155-157.