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24卷    第2期    总第179期    2014年2月

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文章编号:1004-0609(2014)02-0325-10
铸锻复合一体化成形6061铝合金的组织和力学性能
彭 勇1, 2,王顺成1,郑开宏1,戚文军1,周海涛2

(1. 广东省工业技术研究院(广州有色金属研究院) 金属加工与成型技术研究所,广州 510650;
2. 中南大学 材料科学与工程学院,长沙 410083
)

摘 要: 采用铸锻复合一体化成形6061铝合金,研究启锻时间对6061铝合金的凝固、补缩、显微组织和力学性能的影响。结果表明:靠近锻压冲头面6061铝合金为流线变形组织,中间部位晶粒则被压扁压实,靠近下模部分的合金晶粒在模具激冷作用下得到细化。当启锻时间为3~4 s时,锻压作用能够对合金进行强制性补缩和压实组织,并产生塑性变形,避免了缩孔、裂纹和组织疏松等缺陷出现。随着启锻时间的延长,热处理前后铸锻件的抗拉强度和伸长率先增大再趋于平缓和减小,当启锻时间为4 s时,6061铝合金铸锻件的拉伸力学性能达到最高,未热处理的抗拉强度和伸长率分别为211.1 MPa和17.6%,热处理后的抗拉强度和伸长率分别为368.9 MPa和11.5%。

 

关键字: 6061变形铝合金;铸锻复合一体化成形;启锻时间;强制补缩

Microstructure and mechanical properties of 6061 aluminum alloy prepared by casting-forging integrated technology
PENG Yong1, 2, WANG Shun-cheng1, ZHENG Kai-hong1, QI Wen-jun1, ZHOU Hai-tao2

1. Institute of Materials Processing and forming technology, Guangdong General Research Institute of Industrial Technology (Guangzhou Research Institute of Non-ferrous Metals), Guangzhou 510650, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China.

Abstract:The casting-forging integrated technology was adopted to prepare 6061 aluminum alloy. The effects of forging start-up time on solidification, feeding, microstructure and mechanical properties of 6061 aluminum alloy were investigated. The results show that the microstructure of 6061 aluminum alloy closed to forging punch surface is deformation microstructure. The grains of 6061 aluminum alloy in the middle part are crushed and compacted. The grains of 6061 aluminum alloy closed to the lower mold are refined due to the chilling effect by the mold. When the forging start-up time is 3-4 s, the shrinkage, cracks and loose tissue can be avoided, because the forging force can effectively carry out pressure feeding, and make structure compacted through the forced feeding and plastic deformation. With the increase of forging start-up time, the tensile strength and elongation of 6061 aluminum alloy with and without T6 heat treatment first increase and then decrease. The maximal mechanical properties of the 6061 aluminum alloy parts can be obtained when the forging start-up time is 4 s. The tensile strength and elongation of 6061 aluminum alloy without T6 heat treatment is 211.1 MPa and 17.6%, respectively. The tensile strength and elongation of 6061 aluminum alloy with T6 heat treatment is 368.9 MPa and 11.5%, respectively.

 

Key words: 6061 wrought aluminum alloy; casting-forging integrated technology; forging start-up time; forced feeding

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

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

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