半连续铸态镁合金AZ31动态再结晶模型建立与验证
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摘要
通过Gleeble-3500热变形模拟机对半连续铸态镁合金AZ31进行热压缩,变形温度为300~450℃,应变速率为0.01~1.00 s-1,得出应力-应变曲线后进行线性回归处理,建立了动态再结晶动力学模型,而后通过对热压缩中的动态再结晶过程进行有限元分析,将模拟的再结晶结果与实验结果进行比较验证。结果表明,随着变形温度的升高或者应变速率的降低,动态再结晶分数增加。同时,变形温度越低,应变速率越高,再结晶晶粒尺寸越细小。预测的晶粒尺寸、分布与试验结果一致。
Hot compression tests for semi-continuous casting AZ31 magnesium alloy were conducted on Gleeble-3500 thermal simulator. The stress-strain curves were obtained at temperatures of 300~450 ℃ with strain rates of 0.01~1.00 s-1.The empirical dynamic recrystallization models were established based on the linear regression of the stress-strain curves.The dynamic recrystallization evolution during the hot compression was simulated by finite element analysis with the models, and the simulated results were also validated by experiment measurements. The results show that the dynamic recrystallization fraction increases with the increase of deformation temperature or the decrease of strain rate. Furthermore,the lower the deformation temperature or the higher the strain rate, the smaller the recrystallized grain size. The predicted gain sizes and distributions are in good agreement with the experimental ones.
Hot compression tests for semi-continuous casting AZ31 magnesium alloy were conducted on Gleeble-3500 thermal simulator. The stress-strain curves were obtained at temperatures of 300~450 ℃ with strain rates of 0.01~1.00 s-1.The empirical dynamic recrystallization models were established based on the linear regression of the stress-strain curves.The dynamic recrystallization evolution during the hot compression was simulated by finite element analysis with the models, and the simulated results were also validated by experiment measurements. The results show that the dynamic recrystallization fraction increases with the increase of deformation temperature or the decrease of strain rate. Furthermore,the lower the deformation temperature or the higher the strain rate, the smaller the recrystallized grain size. The predicted gain sizes and distributions are in good agreement with the experimental ones.
引文
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[20]Li H Z,Wang H J,Li Z,et al.Flow behavior and processing map of as-cast Mg-10Gd-4.8Y-2Zn-0.6Zr alloy[J].Mat Sci Eng A-Struct,2010,528:154-160.
[21]Li Luo-xing,Lou Yan.Ram speed profile design for isothermal extrusion of AZ31 magnesium alloy by using FEM simulation[J].Transactions of Nonferrous Metals Society of China,2008,18(s1):252-256.
[2]刘洪涛,王若超,周吉学,等.AZ31B镁合金焊接头显微组织及织构演化研究[J].铸造技术,2017,38(4):906-909.
[3]朱亚哲,李保成,张治民,等.镁合金的特点及其塑性加工技术研究进展[J].热加工工艺,2012,41(1):88-91.
[4]Lee Sung Yun,Ko Dae Cheol,Lee Sang Kon,et al.Porthole Extrusion Process Design for Magnesium-Alloy Bumper Back Beam by Using FE Analysis and Extrusion Limit Diagram[J].Advances in Mechanical Engineering,2014,6(1):120745-120745.
[5]Lee In Kyu,Lee Sung Yun,Lee Sang Kon,et al.Porthole Extrusion Process Design for Magnesium Alloy Bumper Back Beam[J].International Journal of Precision Engineering&Manufacturing,2015,16(7):1423-1428.
[6]姜炳春,王淑萍,刘方方,等.有限元分析宽厚比对镁合金变通道挤压的影响[J].铸造技术,2016,37(10):2160-2134.
[7]何运斌,潘清林,覃银江,等.ZK60镁合金热变形过程中的动态再结晶动力学[J].中国有色金属学报,2011(6):1205-1213.
[8]张诗昌,杨倩,田甜,等.拉伸条件下AZ31镁合金动态再结晶的研究[J].热加工工艺,2013,42(10):63-66.
[9]王忠堂,张士宏,齐广霞,等.AZ31镁合金热变形本构方程[J].中国有色金属学报,2008(11):1977-1982.
[10]金朝阳,殷凯,史伟伟,等.变形温度对镁合金等通道转角挤压晶粒尺寸演变影响的有限元模拟[J].精密成形工程,2017(3):19-24.
[11]蔡志伟,陈拂晓,郭俊卿,等.AZ41M镁合金动态再结晶组织演变模拟[J].材料热处理学报,2016(4):216-221.
[12]Suresh K,Rao K P,Prasad Y V R K,et al.Effect of calcium addition on the hot working behavior of as-cast AZ31 magnesium alloy[J].Materials Science&Engineering A,2013,588(3):272-279.
[13]李落星,何凤亿,刘筱,等.AM80-0.2Sr-1.5Ca镁合金高温压缩过程动态再结晶模拟[J].湖南大学学报(自然科学版),2011,38(12):46-51.
[14]贾玉鑫,黄金亮,冯剑.Mg-8Li-2Al-1Zn合金的热变形行为[J].材料热处理学报,2014,35(9):210-214.
[15]徐庆军,张治民,张星,等.变形镁合金塑形成形过程晶粒变化模拟研究[J].热加工工艺,2012,41(1):80-82.
[16]Liu Juan,Cui Z,Ruan L.A new kinetics model of dynamic recrystallization for magnesium alloy AZ31B[J].Materials Science&Engineering A,2011,529(1):300-310.
[17]朱雄,夏华,胡冬,等.镁合金AZ40M再结晶晶粒尺寸与硬度模型研究[J].精密成形工程,2014(5):76-79.
[18]李永新,惠小健,吴桂敏,等.AZ31合金的挤压工艺数值模拟及参数优化[J].铸造技术,2017,38(3):705-710.
[19]Ji G,Li F,Li,Q.et al.Research on the dynamic recrystallization kinetics of Aermet100 steel[J].Mat Sci Eng A-Struct,2010,527:2350-2355.
[20]Li H Z,Wang H J,Li Z,et al.Flow behavior and processing map of as-cast Mg-10Gd-4.8Y-2Zn-0.6Zr alloy[J].Mat Sci Eng A-Struct,2010,528:154-160.
[21]Li Luo-xing,Lou Yan.Ram speed profile design for isothermal extrusion of AZ31 magnesium alloy by using FEM simulation[J].Transactions of Nonferrous Metals Society of China,2008,18(s1):252-256.