Journal
HIGH TEMPERATURE MATERIALS AND PROCESSES
Volume 37, Issue 2, Pages 163-172Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/htmp-2016-0096
Keywords
Aermet 100; constitutive model; modified Johnson Cook model
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Funding
- National Natural Science Foundation of China [51504037, 51605387]
- National key research and development program [2016YFB1100103]
- Natural Science Foundation of Shaanxi Province [2014JQ6210]
- Special Fund for Basic Scientific Research of Central Colleges, Chang'an University [2014G1311090, 310831161023]
- Special Fund for Innovation Team Research of Central Colleges [310831163401]
- fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201646]
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The predicted flow behaviors of Aermet 100 steel were analyzed within a wide range of temperatures of 1,073 K-1,473 K and strain rates of 0.01 s(-1)-50 s(-1) based on isothermal compression tests. Using the original Johnson Cook (JC) model and a modified Johnson Cook (MJC) model, the constitutive equations were constructed in the case of elevated temperatures. For both the JC and MJC, and the previously studied (Arrhenius-type model and double-multivariate nonlinear regression (DMNR)) models, their respective predictability levels were evaluated by contrasting both the correlation coefficient R and the average absolute relative error (AARE). The results showed that the prediction from the three models meet the accuracy requirement based on the experimental data, the only exception being the JC model. By comparing the predictability and numbers of material constants involved, the modified Johnson Cook model is regarded as an excellent choice for predicting the flow behaviors of Aermet 100 steel within the range being studied.
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