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Korean Journal of Metals and Materials > Volume 55(10); 2017 > Article
Korean Journal of Metals and Materials 2017;55(10): 710-715. doi: https://doi.org/10.3365/KJMM.2017.55.10.710
Inhomogeneous Deformation of Interstitial Free Steel during the High Pressure Torsion Process
Yuepeng Song1, Miaomiao Chen1, Wenke Wang1, Baoyan Xu1, Dongsheng Gao2, Shuai Zhang1, Hyoung Seop Kim3
1Mechanical and Electronic Engineering College, Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Shandong Agricultural University, Tai’an 271000, China
2College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271000, China
3Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
Correspondence  Yuepeng Song ,Tel: +82-55-772-1667, Email: uptonsong@163.com
Hyoung Seop Kim ,Tel: +82-55-772-1667, Email: hskim@postech.ac.kr
Received: 30 December 2016;  Accepted: 2 July 2017.  Published online: 28 September 2017.
ABSTRACT
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation in the HPT-processed IF steel disk was inhomogeneous, producing low hardness in the center and high hardness in the edge region. The experimental results, including the hardness and microstructure distributions, indicated that the severe deformation zone proceeds gradually from the center to the edge of the HPT disks in the early torsion stage, and also confirmed verify that the deformation on the upper surface of the disks lags behind that on the bottom surface. Simulation results from a finite element method analysis strongly supported the experimental conclusions.
Keywords: high pressure torsion, early torsion stage, IF steel, deformation, finite element analysis
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