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Abstract：
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For the hemming crack problem of 6016 aluminum alloy sheet in the actual production, the reasons for the hemming crack were explored, and the structure evolution in the process of hemming crack was analyzed by metallographic microscope and scanning electron microscope. The results show that in the undeformed area, the grains are all recrystallized grains, and the grain distribution on the surface is relatively uniform, the grain size in the surface layer of cross and longitudinal sections is larger than that in the core, and there are abnormally grown grains to adversely affect the hemming performance. At the hemming cracks, the cracks are initiated at the outer tensile surface and the inner compression area, there are also coarse slip zones in the area mainly caused by the localized high strain, and the existence of microcracks is the result of grain boundary debonding. Furthermore, a large number of dimples are found on the surface of cracks, and there is a coarse second phase at the cracks which is the iron-rich phase by the energy spectrum analysis. Since the formation and propagation of cracks are related to the iron-rich phase, refining the iron-rich phase is beneficial to improve the hemming performance.
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Funds：
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AuthorIntro：
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迟蕊（1992-），女，硕士，工程师，E-mail：chirui@nanshan.com.cn
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Reference：
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