锻压技术

纯铜反复锻造工艺

英文标题：Repetitive forging process for pure copper

作者：张健伟石凤健叶思珍张浩然

单位：江苏科技大学

分类号：TG316.3

出版年,卷(期):页码：2020,45(4):21-27

摘要：

采用DEFORM软件分析了纯铜反复锻造时的变形行为、速度场、载荷、等效应变以及工艺路线对等效应变的影响。结果表明：高宽比为1的试样，采用楔形凸模在第1次锻造的变形初期，试样存在转动现象，然后，试样左、右两侧沿纵向发生剪切，最后充满型腔；采用平端面凸模第1次反向锻造时，材料首先沿水平方向流动，然后，试样左、右两侧沿纵向发生剪切，最后充满型腔。上述变形过程会导致试样变形不均匀。按照A路线反复锻造后，试样上、下表面的等效应变较高，两侧较低；按照B路线锻造，可以在提高应变水平的同时提高变形均匀性。实验研究表明，经B路线4道次反复锻造后，试样获得了超细晶组织。

Deformation behavior, velocity field, load, effective strain and the effect of process route on effective strain during repetitive forging (RF) of pure copper were investigated by using DEFORM software. The results show that the rotation of sample whose ratio of height to width is one occurs at the initial stage during the first forging with inclined punch. Then the shear deformation along longitudinal direction is produced between the left and right sides of sample. Finally, the cavity is filled.While, the material initially flows along the horizontal direction during the first reverse forging with flat punch. Then the shear deformation along longitudinal direction is produced between the left and right sides of sample. Finally, the cavity is filled. The above deformation processes would lead to inhomogeneous deformation in the sample. The higher effective strain is located at the top and bottom surfaces of sample and the lower effective strain is at the both sides during RF with route A. The effective strain level and deformation homogeneity can be improved during RF with route B. The experimental studies show that ultra-fine grains can be obtained by four passes RF with route B.

基金项目：

江苏省高等学校大学生实践创新训练计划项目（201910289061Y）

张健伟（1998-），男，本科生 E-mail：3490364303@qq.com 通讯作者：石凤健（1977-），男，博士，副教授 E-mail：shifengjian@126.com

参考文献：

[1]Ruslan Z Valiev, Terence G Langdon. Principles of equalchannel angular pressing as a processing tool for grain refinement [J]. Progress in Materials Science, 2006, 51(7): 881-981.

[2]Peter Cengeri, Michael B Kerber, Erhard Schafler, et al. Strengthening during heat treatment of HPT processed copper and nickel [J]. Materials Science & Engineering A, 2019, 742: 124-131.

[3]张翔，王晓溪，张德坤，等. ECAP挤压道次对6061铝合金力学性能及耐磨性的影响[J]. 锻压技术，2019，44(2)：61-66.

Zhang X, Wang X X, Zhang D K, et al. Influences of ECAP pass on mechanical properties and wear resistance of 6061 aluminum alloy [J]. Forging & Stamping Technology，2019, 44(2):61-66.

[4]Ahmed Wagih, Mohamed Shaat. The dependence of accumulative roll bonded copper mechanical properties on grain subdivision, stacking faults, and lattice strains [J]. Materials Science & Engineering A, 2019, 756: 190-197.

[5]Yao Y, Huang Z H, Li Q, et al. Refining the microstructure, modifying the texture and enhancing the toughness of AZ31B alloy rod by the extrusion and upsetting [J]. Journal of Alloys and Compounds, 2018, 764: 202-209.

[6]Soheil Amani, Ghader Faraji. Recrystallization and mechanical properties of WE43 magnesium alloy processed via cyclic expansion extrusion [J]. International Journal of Minerals, Metallurgy and Materials, 2018, 25(6): 672-681.

[7]Babaei A, Faraji G, Mashhadi M M, et al. Repetitive forging (RF) using inclined punches as a new bulk severe plastic deformation method[J]. Materials Science & Engineering A, 2012, 558:150-157.

[8]石凤健，王雷刚，黄忠富．工艺路线对等径角挤压变形均匀性影响的研究[J]．热加工工艺，2009，38（23）：134-137.

Shi F J, Wang L G, Huang Z F. Influence of process routes on strain homogeneity during equal channel angular pressing[J]. Hot Working Technology, 2009, 38(23): 134-137.

[9]Alexei Vinogradov, Yuri Estrin. Analytical and numerical approaches to modelling severe plastic deformation [J]. Progress in Materials Science, 2018, 95: 172-242.

[10]Estrin Y,Tóth L S. Molinari A, et al. A dislocation-based model for all hardening stages in large strain deformation[J]. Acta Materialia, 1998, 46(15):5509-5522.

[11]占栋，申小平，李大乔. 多向挤压对工业纯铜组织和性能的影响[J]. 有色金属工程，2016，6（3）：8-12，25.

Zhan D, Shen X P, Li D Q. Effect of multidirectional extrusion on microstructure and mechanical properties of pure copper[J]. Nonferrous Metals Engineering, 2016, 6(3): 8-12, 25.

[12]石凤健，王雷刚，许涛，等. 反复镦压工艺制备超细晶铜的组织与性能[J]．材料热处理学报，2011，32（12）：89-93．

Shi F J, Wang L G, Xu T, et al. Microstructure and property of ultra-fine grained copper produced by cyclic channel die compression process [J]. Transactions of Materials and Heat Treatment, 2011, 32(12): 89-93.

服务与反馈：

【文章下载】【加入收藏】