Numerical simulation and experimental verification of AZ91 magnesium alloy in strip rolling with different heating methods
MEI Rui-bin1,2, SHI Xian-li2, BAO Li2, ZHANG Bi-hui3, HOU Jun-qing3, LI Chang-sheng1
1. State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819, Liaoning, China; 2. School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei, China; 3. Iron and Steel Research Institute, Shenkan Qinhuangdao General Engineering Design and Research Institute Co., MCC., Qinhuangdao 066010, Hebei, China
Abstract：The thermal-mechanical behavior of AZ91 magnesium alloy in HSR-HR(Hot Strip Rolling with Heated Roll),NSR-HR(Normal Strip Rolling with Heated Roll)and HSR-NR(Hot Strip Rolling with Normal Roll)processes was studied by FEM. Meanwhile, microstructure and properties of AZ91 alloy were investigated after a large reduction with NSR-HR rolling. The results indicated that the order of stress triaxiality from low to high was HSR-HR,NSR-HR and HSR-NR, but soft coefficient of stress state at B point was presented in reverse order. Therefore,NSR-HR was helpful to improvement of plastic limit and crack healing of magnesium alloy in large plastic deformation. The plastic deformation and annealing were realized synchronously through the heat transfer from roll surface to strip in rolling with heated roll resulted in significant improvement of deformability and homogeneity. The macro-morphology of strip after three passes rolling was better and dynamic recrystallization was completed in the microstructure when roll surface temperature was higher than 300 ℃, which was improved the plasticity and strength of AZ91 at room temperature efficiently. The tensile strength and elongation of strip after three passes rolling with roll surface temperature of 350 ℃ and reduction of 67% were 312 MPa and 32.3%,respectively.
梅瑞斌, 史现利, 包立, 张碧辉, 侯俊卿, 李长生. 不同加热轧制AZ91镁合金带材数值模拟及试验验证[J]. 中国冶金, 2022, 32(1): 112-120.
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