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Chinese Journal of Mechanical Engineering
Published in: Chinese Journal of Mechanical Engineering 2/2017

17-03-2017 | Original Article

Work Hardening Behavior of 1020 Steel During Cold-Beating Simulation

Authors: Fengkui CUI, Yuanfei LING, Jinxue XUE, Jia LIU, Yuhui LIU, Yan LI

Published in: Chinese Journal of Mechanical Engineering | Issue 2/2017

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Abstract

The present research of cold-beating formation mainly focused on roller design and manufacture, kinematics, constitutive relation, metal flow law, thermo-mechanical coupling, surface micro-topography and microstructure evolution. However, the research on surface quality and performance of workpieces in the process of cold-beating is rare. Cold-beating simulation experiment of 1020 steel is conducted at room temperature and strain rates ranging from 2000 to 4000 s−1 base on the law of plastic forming. According to the experimental data, the model of strain hardening of 1020 steel is established, Scanning Electron Microscopy(SEM) is conducted, the mechanism of the work hardening of 1020 steel is clarified by analyzing microstructure variation of 1020 steel. It is found that the strain rate hardening effect of 1020 steel is stronger than the softening effect induced by increasing temperatures, the process of simulation cold-beating cause the grain shape of 1020 steel significant change and microstructure elongate significantly to form a fibrous tissue parallel to the direction of deformation, the higher strain rate, the more obvious grain refinement and the more hardening effect. Additionally, the change law of the work hardening rate is investigated, the relationship between dislocation density and strain, the relationship between work hardening rate and dislocation density is obtained. Results show that the change trend of the work hardening rate of 1020 steel is divided into two stages, the work hardening rate decreases dramatically in the first stage and slowly decreases in the second stage, finally tending toward zero. Dislocation density increases with increasing strain and strain rate, work hardening rate decreases with increasing dislocation density. The research results provide the basis for solving the problem of improving the surface quality and performance of workpieces under cold-beating formation of 1020 steel.
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Metadata
Title
Work Hardening Behavior of 1020 Steel During Cold-Beating Simulation
Authors
Fengkui CUI
Yuanfei LING
Jinxue XUE
Jia LIU
Yuhui LIU
Yan LI
Publication date
17-03-2017
Publisher
Chinese Mechanical Engineering Society
Published in
Chinese Journal of Mechanical Engineering / Issue 2/2017
Print ISSN: 1000-9345
Electronic ISSN: 2192-8258
DOI
https://doi.org/10.1007/s10033-017-0086-4

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