Constitutive analysis for hot deformation behaviour of novel bimetal consisting of pearlitic steel and low carbon steel

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:595

Article

Gao, X. J.^1,2  Jiang, Z. Y.¹  Wei, D. B.^1,3  Li, H. J.¹  Jiao, S. H.⁴  Xu, J.⁵  Zhang, X. M.⁵  Han, J. T.⁶  Chen, D. F.² 

[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[3] Univ Technol Sydney, Sch Elect Mech & Mechatron Syst, Sydney, NSW 2007, Australia

[4] Baoshan Iron & Steel Co Ltd, Baosteel Res Inst, Shanghai 200941, Peoples R China

[5] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110004, Peoples R China

[6] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

关键词: Constitutive equation;    Pearlitic steel;    Bimetal;    Prediction of flow stress;   

DOI  :  10.1016/j.msea.2013.10.096

来源: Elsevier

【 摘 要 】

To understand the high temperature flow behaviour of a novel pearlitic steel (PS) and low carbon steel (LCS) bimetal, hot compression tests in a wide range of temperature and strain rate were conducted on a Gleeble 3500 thermo mechanical simulator, and the constitutive model was developed based on the experimental data. The measured true stress-strain curves exhibited three types of variation patterns, which are (i) a plateau type, (ii) single peak type and (iii) multi peaks type. These patterns well displayed the effects of the deformation temperature, strain rate and plastic strain on the flow behaviour of the bimetal. By incorporating the Zener-Hollomon parameter and material parameter functions of alpha(epsilon), n(epsilon), Q(epsilon) and A(epsilon) into Arrhenius-type constitutive equation, the flow stress values predicted by the proposed model show a good agreement with experimental results by the evidence of reproducing true stress-strain curves accurately, high value of correlation coefficient (R=0.9873) and low value of average absolute relative error (AARE=4.81%). The proposed constitutive equation can be used to realise numerical simulation and determine processing parameters during hot-working of the PS/LCS bimetal. (C) 2013 Elsevier B.V. All rights reserved.

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