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Abstract：
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For comparison of extrusion effect made by two kinds of dies, the extrusion processes of two-pass single-channel ECAP and one-pass parallel double-channel ECAP were simulated respectively by Deform-3D. The load-stroke curves of extrusion punch and equivalent stress and strain of samples were analyzed. The results show that shear deformation takes place in 45°angular district, and small area and high-strain sections on sample edges expand constantly until the new plane strain sections emerge with the extrusion. Even though the effects of parallel double-channel extrusion and two-pass single-channel extrusion are the same in theory, the former is improved six times in axial strain deformation than the latter, and correspondingly the total effective strain increases about 35%. Therefore, a better strain hardening effect is obtained. Meanwhile, load of punch increases twice up to 255 kN, whicch results in a higher requirement on die material strength.
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Funds：
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地区科学基金项目资助（51665028）
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AuthorIntro：
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作者简介：段红燕（1978-），女，博士，副教授
E-mail：duanhy@lut.cn
通讯作者：杨勐（1992-），男，硕士研究生
E-mail：1712417179@qq.com
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Reference：
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［1］ 韩飞，彭大暑，林高用.304奥氏体不锈钢加工硬化及退火软化的研究
［D］.长沙：中南大学，2004.
Han F，Peng D S，Lin G Y. Work Hardening and Anneal Softening Investigation on 304 Austenitic Stainless Steel
［D］.Changsha: Central South University,2004.
［2］ Segal V M, Reznikov V I, Drobyshevskii A E, et al. Plastic metal working by simple shear
［J］. Izvestia Akademii nauk SSSR Metally, 1981, (1):115-123.
［3］ 郭廷彪，丁雨田，胡勇，等.等通道转角挤压（ECAP）工艺的研究进展
［J］.兰州理工大学学报，2008，34（6）：19-24.
Guo T B，Ding Y T，Hu Y，et al. Research progressing of technology of equal-channel angular pressing (ECAP)
［J］.Journal of Lanzhou University of Technology，2008，34（6）：19-24.
［4］ 雷力明，黄旭，段锐，等.等通道转角挤压工艺的研究进展
［J］.材料工程，2009，（5）：76-80.
Lei L M, Huang X, Duan R, et al. Progress in equal channel angular extrusion process
［J］. Journal of Materials Engineering，2009，（5）：76-80.
［5］ 郑志军.ECAP制备的块体纳米晶304不锈钢的组织演变、力学性能与腐蚀性为
［D］.广州：华南理工大学，2012.
Zheng Z J. Microstructure Evolution, Mechanical Property and Corrosion Behaviour of Bulk Nanocrystalline 304 Stainless Steel by Equal-channel Angular Pressing
［D］.Guangzhou: South China University of Technology,2012.
［6］ 郑志军，高岩.304不锈钢在ECAP过程中形变诱发马氏体的定量计算
［J］.材料工程，2008，（10）：137-141.
Zheng Z J, Gao Y. Quantitative measurement of deformation-induced martensite during ECAP of 304 stainless steel
［J］.Journal of Materials Engineering，2008，（10）：137-141.
［7］ 陈国星，高岩.等径角挤压法(ECAP)制备块体超细晶奥氏体不锈钢的工艺及性能
［D］.广州：华南理工大学，2010.
Chen G X, Gao Y. Investigation on the Process and Performance of Bulk Ultrafine Grained Austenitic Stainless Steel by Equal Channel Angular Pressing
［D］.Guangzhou: South China University of Technology,2010.
［8］ 谢贤龙，王经涛，王荣山.等径角变形优化奥氏体不锈钢性能的研究
［D］.南京：南京理工大学，2013.
Xie X L, Wang J T, Wang R S. Investigation on Improvement of Properties of an Austenitic Stainless Steel by Equal Channel Angular Pressing
［D］.Nanjing: Nanjing University of Science & Technology,2013.
［9］Iwahashi Y, Horita Z, Nemoto M, et al. The process of grain refinement in equal-channel angular pressing
［J］. Acta Materialia, 1998, 46(9):3317-3331.
［10］ Djavanroodi F, Omranpour B, Ebrahimi M, et al. Designing of ECAP parameters based on strain distribution uniformity
［J］.Progress in Natural Science: Materials International,2012, 22（5）:452-460.
［11］张豪，夏琴香，方铭，等. 201不锈钢形变诱发马氏体相变特性
［J］.锻压技术，2017，42（1）：105-110.
Zhang H，Xia Q X，Fang M，et al. Research on the properties of transformation induced by martensite deformation of stainless steel 20
［J］.Forging & Stamping Technology，2017，42（1）：105-110.
［12］王克平，赵西城.ECAP模具结构改进与设计
［J］.金属铸锻焊技术，2009，38（1）：144-149.
Wang K P, Zhao X C. Design and improvement of die for ECAP
［J］. Casting Forging Welding Hot Working Technology，2009，38（1）：144-149.
［13］李贝，柴跃生.AZ31镁合金变通道转角挤压数值模拟
［D］.太原：太原科技大学，2012.
Li B, Chai Y S. Numerical Simulation on AZ31 Magnesium Alloy by Changing Channel Angular Press
［D］.Taiyuan: Taiyuan University of Science & Technology,2012.
［14］ 王裕，梁伟.等通道转角挤压的有限元模拟及应用
［D］.太原：太原科技大学，2012.
Wang Y, Liang W. Finite Element Simulation and Application of Equal Channel Angular Extrusion
［D］.Taiyuan: Taiyuan University of Science & Technology, 2012.
［15］ 陈文杰，周清，邓竹君，等.基于Normalized C &L准则的ECAP裂纹萌生趋势的数值模拟
［J］.锻压技术，2010,35（5）：159-163.
Chen W J,Zhou Q,Deng Z J,et al. Numerical simulation of crack initiation trends during ECAP based on Normalized Cockcroft & Latham ductile fracture criterion
［J］.Forging & Stamping Technology，2010,35（5）：159-163.
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