Transactions of Materials and Heat Treatment

Title：Finite element numerical simulation analysis and experimental research on forging-bending repeated deformation for magnesium alloys

Authors： Li Minhao1 Lu Liwei1 2 Zhang Jialong1 Fan Yutian2 Che Bo2 Ma Min2

Unit： Hunan University of Science and Technology

KeyWords： AZ31 magnesium alloy forging-bending repeated deformation equivalent strain microstructure hardness

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2023,48(2):52-61

Abstract：

In order to improve the limitation of size parameters in the actual operation of traditional large plastic deformation technology, intensify the grain refinement effect of AZ31 magnesium alloy and strengthen its comprehensive mechanical properties, the deformation behavior and microstructure of AZ31 magnesium alloy plate were studied by DEFORM-3D finite element numerical simulation and four-pass forging-bending repeated deformation process experiment at 300 ℃. The simulation results show that the more the deformation passes are, the greater the equivalent strain value is. During the one-pass deformation, the equivalent strain presents an interval distribution, but after four-pass deformation, the high-strain region diffuses to the low-strain region, and the equivalent strain distribution tends to be uniform. At the same time, there is shear force in the deformation process, and the bending shear action and forging action are coupled with each other, which can promote grain refinement and open non-base slip and is helpful to intensify the microstructure and mechanical properties of AZ31 magnesium alloy. The experimental results show that the more the deformation passes are, the better the grain refinement effect is, the average grain size can be significantly refined to 7.1 μm, and at the same time, the microstructure uniformity is continuously improved. After four-pass deformation, the texture orientation distribution of the plate in different regions has little difference, and the hardness value distribution is relatively uniform with an average hardness value of 62.8 HV.

Funds：

国家自然科学基金资助项目(52174362，51975207)；湖南省自然科学基金资助项目(2021JJ30257，2020JJ5181)；湖南省教育厅资助项目(19C0773)

作者简介：李旻昊(1997-)，男，硕士研究生，E-mail：969426949@qq.com；通信作者：卢立伟(1983-)，男，博士，教授，E-mail：cqulqyz@126.com

Reference：

[1]代晓军, 杨西荣, 荆磊, 等. 等通道挤压变形技术制备超细晶镁合金的研究进展[J]. 稀有金属, 2020, 44(12): 1325-1332.

Dai X J, Yang X R, Jing L, et. al. Research progress in ultrafine grain magnesium alloy by equal channel angular pressing[J]. Chinese Journal of Rare Metals, 2020, 44(12): 1325-1332.

[2]陈振华. 镁合金[M]. 北京: 化学工业出版社, 2004.

Chen Z H. Magnesium Alloy[M]. Beijing: Chemical Industry Press, 2004.

[3]黎文献. 镁及镁合金[M]. 长沙: 中南大学出版社, 2005.

Li W X. Magnesium & Magnesium Alloy[M]. Changsha: Zhongnan University Press, 2005.

[4]李权. Mg-Al-Zn系镁合金热模拟挤压组织研究[D]. 重庆: 重庆大学, 2008.

Li Q. Investigation of Affecting Factors on Microstructure of Hot Extruded Mg-Al-Zn Alloys[D]. Chongqing: Chongqing University, 2008.

[5]崔忠圻, 覃耀春. 金属学与热处理[M].2版.北京: 机械工业出版社, 2007.

Cui Z Q, Qin Y C. Metallography & Heat Treatment [M]. 2nd Edition. Beijing: China Machine Press, 2007.

[6]王文柯. ZK60镁合金板材降温轧制及织构对其成形性影响研究[D]. 哈尔滨: 哈尔滨工业大学, 2019.

Wang W K. Research on Lowered Temperature Rolling of ZK60 Plates and the Effect of Texture on Formability[D]. Harbin: Harbin Institute of Technology, 2019.

[7]Kang W, Lu L W, Feng L B, et al. Effects of pre-aging on microstructure evolution and deformation mechanisms of hot extruded Mg-6Zn-1Gd-1Er Mg alloys[EB/OL]. https://doi.org/10.1016/j.jma.2021.05.019，2021-07-24.

[8]Wu H R, Du W B, Li S B, et al. Microstructure and mechanical properties of AZ31 magnesium alloy reinforced by I-phase[J]. Rare Metals, 2019, 38(8): 733-738.

[9]Sheng K, Lu L W, Xiang Y, et al. Crack behavior in Mg/Al alloy thin sheet during hot compound extrusion[J]. Journal of Magnesium and Alloys, 2019, 7(4): 717-724.

[10]白晓青. 挤压-转角挤压AZ31镁合金板组织及力学性能研究[D]. 太原: 太原理工大学, 2020.

Bai X Q. Study on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Sheet Fabricated by Extrusion-angle Extrusion[D]. Taiyuan: Taiyuan University of Technology, 2020.

[11]胡红军, 胡刚, 谢黛薇, 等. 新型镁合金管材挤压-剪切-弯曲连续成形的研究与验证[J]. 中国有色金属学报, 2022,32(4):921-929.

Hu H J, Hu G, Xie D W, et al. Researches and validation on new type continuous forming for extrusion-shear-bending of magnesium alloy thin-walled tube[J]. The Chinese Journal of Nonferrous Metals, 2022,32(4):921-929.

[12]Guan D K, Gao J H, Sharp J，et al. Enhancing ductility and strength of nanostructured Mg alloy by in-situ powder casting during spark plasma sintering[J]. Journal of Alloys and Compounds, 2018,769: 71-77.

[13]Zhang W G,Ye Y C,He L J,et al. Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates[J]. Journal of Alloys and Compounds, 2017，696: 1067-1079.

[14]齐艳阳, 刘江林, 王涛, 等. 基于FEM分析轧制预变形对AZ31B镁合金热轧板材边部损伤的影响规律[J]. 稀有金属, 2022,46(7):873-881.

Qi Y Y, Liu J L, Wang T, et al. Edge damage of hot rolled AZ31B magnesium alloy sheets with pre-rolling based on FEM[J]. Chinese Journal of Rare Metals,2022，46(7)：873-881.

[15]Tian J, Huang H L, Pan Z Q, et al.Effect of flow velocity on corrosion behavior of AZ91D magnesium alloy at elbow of loop system[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(11): 2857-2867.

[16]Hibbeler R C. Mechanics of Materials [M].6th Edition. New York:Pearson College Div, 2004.

[17]Wang W K, Zhang W C, Chen W Z,et al. Homogeneity improvement of friction stir welded ZK61 alloy sheets in microstructure and mechanical properties by multi-pass lowered-temperature rolling[J]. Materials Science & Engineering:A, 2017,703: 17-26.

[18]Litzy Lina Choquechambi Catorceno, Hamilton Ferreira Gomesde de Abreu, Angelo Fernando Padilha. Effects of cold and warm cross-rolling on microstructure and texture evolution of AZ31B magnesium alloy sheet[J]. Journal of Magnesium and Alloys, 2018, 6(2): 121-133.

[19]Kim S H, You B S, Yim C D, et al. Texture and microstructure changes in asymmetrically hot rolled AZ31 magnesium alloy sheets[J]. Materials Letters, 2005, 59(29-30): 3876-3880.

[20]邵爽. 深冷处理对 Mg-1.5Zn-0.15Gd 合金显微组织与力学性能的影响[D]. 南昌: 南昌大学, 2014.

Shao S. The Effect of Cryogenic Treatment on the Microstructure and Mechanical Properties of Mg-1.5Zn-0.15Gd Alloy[D]. Nanchang: Nanchang University, 2014.

[21]吴卓阳. 室温多向锻造及时效对AZ80镁合金组织与性能的影响[D]. 太原: 中北大学, 2021.

Wu Z Y. Effect of Room Temperature Multidirectional Forging and Aging on Microstructure and Properties of AZ80 Magnesium Alloy[D]. Taiyuan: North University of China, 2021.

[22]Liu Y, Shao S, Xu C S, et al. Effect of cryogenic treatment on the microstructure and mechanical properties of Mg-1.5Zn-0.15Gd magnesium alloy[J]. Materials Science and Engineering: A, 2013, 588: 76-81.

[23]Yin D D, Boehlert C J, Long L J, et al. Tension-compression asymmetry and the underlying slip/twinning activity in extruded Mg-Y sheets[J], International Journal of Plasticity，2021，136: 102878.

[24]Wang Y, Li F, Bian N, et al. Coordinated control of preferred orientation and uniformity of AZ31 in accumulative alternating back extrusion[J]. Materials Science and Engineering:A, 2021,818: 141366.

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