帮助 关于我们

返回检索结果

AZ31镁合金连续强流变轧制成形过程温度场模拟与优化
SIMULATION AND OPTIMIZATION OF THERMAL FIELD DURING CONTINUOUS CONSTRAINED RHEOROLLING OF AZ31 ALLOY

查看参考文献18篇

文摘 采用数值模拟与实验相结合,对AZ31镁合金连续强流变轧制成形过程温度场进行了模拟与优化.结果表明,在倾斜板表面,合金温度从浇注口到出口逐渐趋于线性降低;在横断面上,接触倾斜板一侧合金温度比上侧低,当浇注温度大于690℃时,熔体在倾斜板出口温度高于AZ31合金液相线温度,容易发生制品断裂.在轧制变形区后滑区,主要发生半固态金属变形,合金从孔型入口到出口温度逐渐降低,半固态区间随着浇注温度的升高而增长,温度等值线发生两次弯曲,表层合金温度等值线向孔型出口凸出,而中心合金温度等值线向孔型入口凸出,其弯曲程度从中性面到孔型入口越来越明显;在轧制变形区的前滑区,主要发生固态金属的变形,温度等值线发生一次弯曲,且向孔型出口凸出.在本实验条件下,较合理的浇注温度范围在670—690℃之间。
其他语种文摘 Semisolid metal processing(SSP) is recognized as a new near-shape forming technology, which combines the merits of both the liquid and the solid metal processing.Compared with the traditional rolling process, this technology has the features of low energy consumption, low cost equipment and high yield.Perhaps inevitably, a problem is the solid and liquid phases tend to separate with each other during rheo-rolling process, especially when the semisolid slurry has a low solid fraction.This problem causes macrosegregation and reduces the quality of the strip.Using rectangular groove roller may solve this problem.In this paper, numerical simulation method and experiment were combined for simulation and optimization of thermal field during continuous constrained rheo-rolling of AZ31 alloy.The results show that on the sloping plate surface, alloy temperature decreases gradually from the casting mouth to the exit with a linear pattern, the alloy temperature near the sloping plate surface is lower than that on the above surface, when the casting temperature is higher than 690℃, the melt temperature at the exit of the plate is higher than the liquidus of AZ31 alloy, which will cause product fracture.In the backward slip zone, semisolid metal deformation mainly happens, alloy temperature decreases gradually from the entrance to the exit of the roll gap, semisolid zone length increases with the casting temperature, isothermal lines have twice buckling, the buckling direction on the surface of the alloy is toward the exit of the roll gap, while the buckling direction in the center is toward the entrance of the roll gap, and their bending degree increases gradually from neutral flow plane to the entrance of the roll gap.In the forward slip zone, solid metal deformation mainly takes place, isothermal lines have once buckling, and the buckling direction is toward the exit of the gap.Under the current experimental conditions, the proper casting temperature between 670 and 690℃is suggested.
来源 金属学报 ,2011,47(9):1167-1173 【核心库】
DOI 10.3724/sp.j.1037.2011.00272
关键词 AZ31镁合金 ; 半固态 ; 强流变轧制 ; 数值模拟 ; 温度
地址

东北大学材料与冶金学院, 沈阳, 110819

语种 中文
文献类型 研究性论文
ISSN 0412-1961
学科 金属学与金属工艺
基金 国家自然科学基金项目 ;  国家973计划
文献收藏号 CSCD:4390392

参考文献 共 18 共1页

1.  管仁国. 金属半固态成形理论与技术,2005:11 被引 1 次    
2.  Flemings M C. Metall Trans,1991,22:957 被引 454 次    
3.  谢丰广. 波浪型倾斜板振动过程中晶粒直接球状长大行为. 东北大学学报(自然科学版),2009,30:377 被引 3 次    
4.  黄红乾. 半固态合金强流变轧制单位轧制压力分布的数学模型和理论研究. 金属学报,2011,47:291 被引 2 次    
5.  张莹. 半固态AZ31流变铸轧温度场数值模拟. 热加工工艺,2010,39:55 被引 5 次    
6.  胡勇. 镁基复合材料半固态压铸过程的数值模拟. 中国有色金属学报,2010,20:1260 被引 4 次    
7.  Kund N K. Trans Nonferrous Met Soc China,2010,20(suppl.3):898 被引 9 次    
8.  Koeune R. J Comput Appl Math,2010,234:2287 被引 5 次    
9.  Kim H H. Numerical simulation and experimental study for rheo-forged component using direct and indirect die system. Trans Nonferrous Met Soc China,2010,20:1799 被引 4 次    
10.  Chen X Y. Foundry,2000,49:106 被引 1 次    
11.  张景新. 电磁搅拌制备半固态材料非枝晶组织的形成机制. 中国有色金属学报,2000,10:511 被引 41 次    
12.  谢水生. 半固态镁合金连续铸轧过程的数值模拟. 塑性工程学报,2007,14:80 被引 5 次    
13.  Haga T. J Mater Process Technol,2003,140:610 被引 5 次    
14.  段文义. 流体力学,2001:132 被引 1 次    
15.  周建兴. 凝固过程数值模拟中的潜热处理方法. 铸造,2001,50:404 被引 26 次    
16.  Scheil E. Z Metallk,1942,34:70 被引 2 次    
17.  Luo S J. Rheology of Semi-Solid Metal,2011:10 被引 1 次    
18.  Chen W F. Chin J Theor Appl Mech,1983,1:16 被引 1 次    
引证文献 5 篇

1 姚志浩 GH738高温合金热变形过程显微组织控制与预测Ⅱ.组织演化模型验证与应用 金属学报,2011,47(12):1591-1599
被引 10 次

2 张力文 倾转浇注法制备半固态浆料的数值模拟 特种铸造及有色合金,2016,36(2):161-164
被引 1 次

显示所有5篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护：中国科学院文献情报中心
地址：北京中关村北四环西路33号 邮政编码：100190 联系电话：(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号