Accessible Requires Authentication Published by De Gruyter August 18, 2021

Evaluation of chilled casting and extrusion-shear forming technology based on numerical simulation and experiments

H. J. Hu, S. L. Gan, Y. Tian, D. F. Zhang, J. K. Feng and Z. W. Ou
From the journal Materials Testing

Abstract

Magnesium alloys on the surface of billets might be refined by chilled casting process, but the grains of the center of billets are coarse, and there are a lot of void defects in the center of billets. These defects can be eliminated by hot extrusion, while fibrous microstructures and strong basal textures might be formed. This paper presents a new short process technology which includes chilled casting and extrusion-shear (CCES). It is crucial to understand the effects of die structures on the deformation behaviors, strain distribution and load requirements. Three selections of processes and die structures were done by simulations and experiments which include CCES process with 4 times consecutive shearings plastic deformation, CCES process by lateral extrusion with 90° shearing angle, and combined CCES process mode. The research results show the third selection is recommended. Three-dimensional (3D) geometric models with different channel angles (30°, 45°) for the third selection CCES dies were designed. The heterogeneities of plastic deformation by CCES dies with different channel angles were analyzed from the simulation results. The simulation results show strains decrease with rising of channel angles. The lower channel angles improve the deformation heterogeneity of magnesium alloy billets. Smaller channel angles obtain higher strains and produce tinier sub-grains. The forces of the CCES process decrease with rising of channel angles. The analysis results showed that finer and uniform microstructures can be obtained if channel angles in the CCES dies are appropriate.


Prof. Dr. Hongjun Hu Materials Science and Engineering College Chongqing University of Technology No.69 Hongguang Road, Banan District Chongqing 400050, China

Acknowledgement

This work was supported by the National Science Foundation of China (52071042, 51771038 and 51571040), and Chongqing Talent Project (cqyc202003047), as well as Chongqing Natural Science Foundation Project of cstc2018jcyjAX0249 and cstc-2018jcyjAX0653.

References

1 Z. D. Zhao, Q. Chen, H. Y. Chao, S. H. Huang: Microstructural evolution and tensile mechanical properties of thixoforged ZK60-Y magnesium alloys produced by two different routes, Materials and Design 31 (2010), pp. 1906-1916 DOI:10.1016/j.matdes.2009.10.056 Search in Google Scholar

2 Q. Chen, Z. D. Zhao, Z. X. Zhao, C. K. Hu, D. Y. Shu: Microstructure development and thixoextrusion of magnesium alloy prepared by repetitive upsetting-extrusion, Journal of Alloys & Compounds 509 (2011), pp. 7303-7315 DOI:10.1016/j.jallcom.2011.04.113 Search in Google Scholar

3 Q. Chen, Z. D. Zhao, G. Chen, B. Wang: Effect of accumulative plastic deformation on generation of spheroidal structure, thixoformability and mechanical properties of large-size AM60 magnesium alloy, Journal of Alloys & Compounds 632 (2015), pp. 190-200 DOI:10.1016/j.jallcom.2015.01.185 Search in Google Scholar

4 Q. Chen, D. Y. Shu, J. Lin, Y. Wu, X. S Xia, S. H. Huang, Z. D. Zhao, O. V. Mishin, G. L.Wu: Evolution of microstructure and texture in copper during repetitive extrusion-upsetting and subsequent annealing, Journal of Materials Science & Technology 33 (2017), pp. 690-697 DOI:10.1016/j.jmst.2017.03.003 Search in Google Scholar

5 H. Hu, Y. Ying, D. Zhang: Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61, Materials Testing 62 (2020), pp. 395-399 DOI:10.3139/120.111155 Search in Google Scholar

6 J. Liu, H. Hu, Y. Liu, D. Zhang, Y Zhi: Mechanical properties and wear-corrosion resistance of a new compound extrusion process for magnesium alloy AZ61, Materials Testing 60 (2018), pp. 325-332 DOI:10.3139/120.111476 Search in Google Scholar

7 Y. Yang, J. Fu, T. Luo, B. Wang, X. Feng, W. Tong, Y. Li : Grain refinement of magnesium alloy by low pressure pulse magnetic field, Transactions of Nonferrous Metals Society of China 21 (2011), pp. 2639-2649 DOI:0.1007/s12598-011-0191-y Search in Google Scholar

8 S. W. Xu,K. Oh-ishi, S. Kamado, H. Takahashi, T. Homma: Effects of different cooling rates during two casting processes on the microstructures and mechanical properties of extruded Mg-Al-Ca-Mn alloy, Materials Science & Engineering A 542 (2012), pp. 71-78 DOI:10.1016/j.msea.2012.02.034 Search in Google Scholar

9 Q. Wang, G. Wu, Z. Hou, B. Chen, Y. Zheng, W. Ding: A comparative study of Mg-Gd-Y-Zr alloy cast by metal mould and sand mould, China Foundry 7 (2010), pp. 6-12 DOI:10.11890/1006-7191-101-72 Search in Google Scholar

10 R. Guan, Z. Zhao, H. Zhang, C. Lian, C. Lee, C. Liu: Microstructure evolution and properties of Mg-3Sn-1Mn (wt.%) alloy strip processed by semisolid rheo-rolling, Journal of Materials Processing Technology 212 (2012), pp. 1430-1436 DOI:10.1016/j.jmatprotec.2012.02.001 Search in Google Scholar

11 Z. Shao, Q. Le, Z. Zhang, J. Cui: Numerical simulation of acoustic pressure field for ultrasonic grain refinement of AZ80 magnesium alloy, Transactions of Nonferrous Metals Society of China 21(2011), pp. 2476-2483 DOI:10.1016/S1003-6326(11)61039-X Search in Google Scholar

12 K. Yu, X. Xue, D. Mao, J. Li, Y. Hu, S. Li: The influence of ultrasonic casting on the microstructure and properties of AZ31 magnesium alloy ingot and hot rolled plate, Journal of Central South University 42 (2011), pp. 1918-1923 DOI:1672−7207(2011)07−1918−05 Search in Google Scholar

13 Z. Zhang, Q. Lei, J. Cui, H. Liu: Solidification structure of Mg-4Al-1Si alloy under ultrasonic field, rare metal materials and engineering 42 (2013), pp. 574-578 DOI:10.3365/KJMM.2013.51.3.245 Search in Google Scholar

14 H. Hao, D. Maijer, M. Wells, A. Phillion, S. Cockcroft: Modeling the stress-strain behavior and hot tearing during direct chill casting of an AZ31 magnesium billet, Metallurgical and Materials Transactions A 41(2010), pp. 2067-2077 DOI:10.1007/s11661-010-0216-4 Search in Google Scholar

15 E. Caron, M. Wells: Secondary cooling in the direct-chill casting of magnesium alloy AZ31, Metallurgical and Materials Transactions B 40 (2009), pp. 585-595 DOI:10.1007/s11663-009-9254-y Search in Google Scholar

16 J. Jiang, Y. Wang, Y. Li, W. Shan, S. Luo: Microstructure and mechanical properties of the motorcycle cylinder body of AM60B magnesium alloy formed by combining die casting and forging, Materials and Design 37 (2012), pp. 202-210 DOI:10.1016/j.matdes.2012.01.012 Search in Google Scholar

17 Q. Chen, B. Yuan, G. Zhao, D. Shu, C. Hu, Z. Zhao, Z. Zhao: Microstructural evolution during reheating and tensile mechanical properties of thixoforged AZ91D-RE magnesium alloy prepared by squeeze casting–solid extrusion, Materials Science and Engineering A 537 (2012), pp. 25-38 DOI:10.1016/j.msea.2012.01.002 Search in Google Scholar

18 Y. Zhang, G. Wu, W. Liu, L. Zhang, P. Song, Y. Wang, W. Ding: Effects of processing parameters and Ca content on microstructure and mechanical properties of squeeze casting AZ91-Ca alloys, Materials Science and Engineering A 595 (2014), pp. 109-117 DOI:10.1016/j.msea.2013.12.014 Search in Google Scholar

19 X. Su, G. Xu, D.Jiang: Abatement of segregation with the electro and static magnetic field during twin-roll casting of 7075 alloy sheet, Materials Science and Engineering A 599 (2014), pp. 279-285 DOI: j.msea.2014.01.042 Search in Google Scholar

20 G. Wang, H. Di, F. Huang: Preparation of AZ31 magnesium alloy strips using vertical twin-roll caster, Transactions of Nonferrous Metals Society of China 20 (2010), pp. 973-979 DOI:10.1016/S1003-6326(09)60244-2 Search in Google Scholar

21 W. Kim, B. Lee: Retardation of grain growth in Mg-3Al-1Zn alloy processed by strip-casting method, Journal of Alloys and Compounds 482 (2009), pp. 106-109 DOI:10.1016/j.jallcom.2009.04.039 Search in Google Scholar

22 H. Hu, Y. Ying, D. Zhang: Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61, Materials Testing 60 (2018), pp. 325-332 DOI:10.3139/120.111155 Search in Google Scholar

23 H. Hu ,Y. Ying, Z. Ou, X. Wang: Influences of extrusion temperatures on the wear behavior of magnesium alloy az31 fabricated by the extrusion shear process, Materials Testing 59 (2017), pp. 41-46 DOI:10.3139/120.110962 Search in Google Scholar

Published Online: 2021-08-18
Published in Print: 2021-08-31

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