Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30184
Influence of Outer Corner Radius in Equal Channel Angular Pressing

Authors: Basavaraj V. Patil, Uday Chakkingal, T. S. Prasanna Kumar

Abstract:

Equal Channel Angular Pressing (ECAP) is currently being widely investigated because of its potential to produce ultrafine grained microstructures in metals and alloys. A sound knowledge of the plastic deformation and strain distribution is necessary for understanding the relationships between strain inhomogeneity and die geometry. Considerable research has been reported on finite element analysis of this process, assuming threedimensional plane strain condition. However, the two-dimensional models are not suitable due to the geometry of the dies, especially in cylindrical ones. In the present work, three-dimensional simulation of ECAP process was carried out for six outer corner radii (sharp to 10 mm in steps of 2 mm), with channel angle 105¶Çü▒, for strain hardening aluminium alloy (AA 6101) using ABAQUS/Standard software. Strain inhomogeneity is presented and discussed for all cases. Pattern of strain variation along selected radial lines in the body of the workpiece is presented. It is found from the results that the outer corner has a significant influence on the strain distribution in the body of work-piece. Based on inhomogeneity and average strain criteria, there is an optimum outer corner radius.

Keywords: Equal Channel Angular Pressing, Finite Element Analysis, strain inhomogeneity, plastic equivalent strain, ultra fine grain size, aluminium alloy 6101.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075040

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1857

References:


[1] V. M. Segal, "Material Processing by simple shear", Mater. Sci. Eng. A 197 (1995) 157-164.
[2] V. M. Segal, "Equal channel angular extrusion: from macromechanics to structure formation", Mater. Sci. Eng. A 271 (1999) 322-333.
[3] Y. Iwahashi, J. Wang, Z. Horita, M. Nemoto, T. G. Langdon, "Principles of equal channel angular pressing of ultra-fine grained materials", Scripta Mater. 35 (2) (1996) 143.
[4] Yi-Lang, Shyong Lee, "Finite element analysis of strain conditions after equal channel angular extrusion", J. Mater. Tech. 140 (2003) 583-587.
[5] S. Li, M. A. M. Bourke, I. J. Beyerlein, D. J. Alexander, B. Clausen, "Finite element analysis of the plastic deformation zone and working load in equal channel angular extrusion", J. Mater. Eng. A 382 (2004) 217-236.
[6] Hl-Heon Son, Jeong-Ho Lee, Yong-Taek Im, "Finite element investigation of equal channel angular extrusion with back pressure", J. Mater. Process. Technol. 171 (2006) 480-487.
[7] C. J. Luis-Perez, R. Luri-Irigoyen, D. Gaston-Ochao, "Finite element modeling of an Al-Mn alloy by equal channel angular extrusion", J. Mater. Process. Tech. 153-154 (2004) 846-852.
[8] Raghavan Srinivasan, "Computer simulation of the equal channel angular extrusion (ECAE) process", Scripta Mater. 44 (2001) 91-96.
[9] H. S. Kim, "Finite element analysis of equal channel angular pressing using a round corner die", Mater. Sci. Eng. A 315 (2001) 122-128.
[10] A. V. Nagasekhar and Yip Tick-Hon, "Optimal tool angles for equal channel angular extrusion of strain hardening materials by finite element analysis", Comp. Mater. Sci. 30(3-4) (2004) 489-495
[11] H. S. Kim, M. H. Seo and S. I. Hong, "Finite element analysis of equal channel angular pressing of strain rate sensitive metals", J. Mater. Process. Tech. 130-131 (2002) 497-503
[12] A. V. Nagasekhar, Y. Tick-Hon, S. Li and H. P. Seow, "Effect of acute tool-angles on equal channel angular extrusion/pressing", Mater. Sci. Eng. A 410-411 (2005) 269-272.
[13] Fuqian Yang, Aditi Saran, K. Okazaki, "Finite element simulation of equal channel angular extrusion", J. Mater. Process. Tech. 166 (2005) 71-78.
[14] S. C. Yoon, P. Quang, S. I. Hong, H. S. Kim, "Die design for homogeneous plastic deformation during equal channel angular pressing", J. Mater. Process. Tech. 187-188 (2007) 46-50
[15] C. W. Su, L. Lu and M. O. Lai, "3D finite element analysis on strain uniformity during ECAP process", Mater. Sci. Tech. 23-6 (2007) 27- 735.
[16] Hong Jiang, Zhiguo Fan, Chaoying Xie, "3D finite element simulation of deformation behavior of CP-Ti and working load during multi-pass equal channel angular extrusion", Mater. Sci. Eng. A (2007).
[17] Tao Suo, Yulong Li, Qiong Deng, "Yuanyong Liu, Optimal pressing route for continued equal channel angular pressing by finite element analysis", Mater. Sci. Eng. A 466 (2007) 166-171.
[18] J. K. Kim, W. J. Kim, "Analysis of deformation behavior in 3D during equal channel angular extrusion", J. Mater. Process. Tech. 176 (2006) 260-267.
[19] ABAQUS User-s Manual, Version 6.5.1, Hibbitt, Karisson & Sorensen 2006.
[20] C. Xu, K. Xia and T. G. Langdon, "The role of back pressure in the processing of pure aluminum by equal-channel angular pressing", Acta Mater., 55 (2007) 2351-2360
[21] D. Nagarajan, "Processing of an aluminium alloy by ECAE prior to cold extrusion", M.S. Thesis, Indian Institute of Technology Madras, India, 2005, 47.
[22] Patil Basavaraj V. Uday Chakkingal, T.S. Prasanna Kumar, "Study of channel angle influence on material flow and strain inhomogeneity in equal channel angular pressing using 3D finite element simulation", Jl. of Mater. Process. Tech. 209 (2009) 89-95.