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Title of Journal: J of Materi Eng and Perform

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Abbravation: Journal of Materials Engineering and Performance

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Springer US

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DOI

10.1002/spe.4380010201

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1544-1024

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A New Constitutive Model for the HighTemperature

Authors: BaoSheng Xie QingWu Cai Yu Wei LiXiong Xu Ning Zhen
Publish Date: 2016/10/13
Volume: 25, Issue: 12, Pages: 5127-5137
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Abstract

The compressive deformation behavior of 95CrMo steel one of the worldwide used hollow steels was investigated on a Gleeble3500 thermosimulation machine within temperature range of 10731323 K and strain rate range of 0110 s−1 Considering the influence of workhardening dynamic recovery and dynamic recrystallization a new constitutive model for hightemperature flow stress was established in this paper The calculated values predicted by the new constitutive model lie fairly close to the experimental values with a correlation coefficient R of generally above 099 and an average absolute relative error of 300 proving a good predictability of the new constitutive model Also a modified SellarsTegartGarofalo model STG model was introduced to verify the precision of the new constitutive model Compared to the modified STG model the new constitutive model has a higher accuracy which implies it is a reliable tool for predicting flow stress at high temperatures not only under equilibrium state but also under transient deformation conditions Besides the new constitutive model was proved still viable in the initial stage of plastic deformation where plastic strain is lower than 005The authors would like to acknowledge the found supported by the National Science Technology Pillar Program during the Twelfth Fiveyear Plan Period Grant Nos 2012BAE03B01 The authors would like to thank Mr YanJun Yin and Mrs Jin Guo for their great help in Gleeble experiments


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