Effect of hot rolling coiling temperature on microstructure and hemming performance of 6014 aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.11.027

Abstract

Abstract: Effect of hot rolling coiling temperature on the microstructure and hemming property of final state 6014 aluminum alloy was investigated. The causes of bending cracking of the final state 6014 aluminum alloy were analyzed by means of metallography, EBSD, XRD, SEM and TEM. The results show that the grains of the final state 6014 alloy with hot rolling coiling temperatures at 310 ℃ and 360 ℃ have been recrystallized and the ratio of grain length width is large, the grain size distribution of the specimens coiled at 310 ℃ is uneven, the grain size at the surface layer is larger than that at the center layer, which is easy to form stress concentration and deformation disharmony, and AlSiCu phase with the size of 20 nm to 40 nm is continuously precipitated on the grain boundary. The surface roughness and slip band density of the specimen with hot rolling coiling temperature at 310 ℃ are greater than that at 360 ℃, the probability of strain localization is higher. The grain size coiled at 360 ℃ is relatively uniform. The proportion of 2.5°- 5° low angle grain boundary is higher than that coiled at 310 ℃, the grain boundary is relatively clean, and the hemming performance is relatively good. When coiled at 310 ℃, there are many iron containing phases with large size in the crack of the bent specimens, which will be broken by the slip band, leading to bending cracking; However, no coarse iron containing phase is found in the crack of the bent specimens coiled at 360 ℃, besides a few dimples.

Key words: 6014 aluminum alloy, hot rolling coiling temperature, slip band, hemming, bending cracking

CLC Number:

TG146.2

Li Tao, Chi Rui, Xu Zhiyuan, Yang Limin, Ma Huilin. Effect of hot rolling coiling temperature on microstructure and hemming performance of 6014 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(11): 173-179.

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