Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第2期    总第47期    2002年4月

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文章编号:1004-0609(2002)02-0264-05
4XXX系铝合金的锻造性能
林哲民,陈永吉吉

(1. Department of Metallurgical Engineering, 
Chonbuk University, 664-14 ducjin-dong ducjin-ku,
chn-ju 561-756, Korea;
2. Department of Metallurgical Engineering,
Chonbuk National University, 664-14 ducjin-dong
ducjin-ku,Chon-ju 561-756, Research Institute of
Advanced Materials Development, Korea
)

摘 要: 对添加微量Sb元素的4XXX系列铝合金的铸造、挤压及锻造显微组织进行了观察。结果表明:铸造状态下的树枝状组织在挤压预热过程中形成了带有方向性的小结晶,之后再成长为显微结晶,观察到了变化为球状的结晶粒。锻造后,α相基体中除了共晶组成(11%~12.6%Si)外,还存在多角形初晶Si和Al4Cu9相。正是这些相的存在,提高了合金的高温强度。在凝固过程中,由于Mg的部分偏析,认为能析出Mg2Si,有助于提高材料的耐热性能,并判断Al4Cu9相起维持高温强度的重要作用。用该材料制造的汽车连杆的平均硬度为Hv133,大体上能够满足实际需要(Hv137)。随着锻造温度的增加,变形抗力和加工应力减小,合金的成形性能得到提高。

 

关键字: 成形性能;挤压;连杆;锻造

Forgeability of 4XXX series
Al alloys
Chul-Min Lim1, Young-cheol Jin2

1. Department of Metallurgical Engineering, 
Chonbuk University, 664-14 ducjin-dong ducjin-ku,
chn-ju 561-756, Korea;
2. Department of Metallurgical Engineering,
Chonbuk National University, 664-14 ducjin-dong
ducjin-ku,Chon-ju 561-756, Research Institute of
Advanced Materials Development, Korea

Abstract:The microstructures of as-cast, extruded and forged 4XXX series Al alloy with addition of Sb were observed. The results show that dendrites in casting are converted into directional micro-crystals, and then recrystallize and grow into spheroidizing grains. After forging, in α-phase, polygonal proeutectic Si and Al4Cu9 are observed in addition to eutectic s(11%~12.6% Si). It is thought that proeutectic Si will improve the heat-resistance by forming Mg2Si with Mg, and that Al4Cu9 will play an important role in maintaining the high temperature strength of the alloy. The average hardness of connecting-rod prepared by this material is Hv133, that almost satisfies the requirement. With the increase of forging temperature, the deformation resistance and stress for working are decreased, which brings about the improvement of formability.

 

Key words: formability; extrusion; connecting-rod; forging

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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