Entropy modeling on serrated flows in carburized steels

Jamieson Brechtl, Bilin Chen, Xie Xie, Yang Ren, Jimmy D. Venable, Peter K. Liaw, Steven J. Zinkle

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Samples comprised of carburized steel alloys, 4615, 4720, and 10B22, were tension tested at room temperature and at a strain rate of 2 × 10−4 s−1. The serrated-flow behavior was modeled and analyzed, using the refined composite multiscale entropy (RCMSE) method. High energy X-ray diffraction revealed the body-centered-cubic (BCC) structure of the three alloys in the as-received condition. Moreover, Vickers-hardness experiments were performed, which showed an increase in the hardness of the alloy that corresponded to increasing impurity concentrations. Here the diffusion coefficient of carbon in the three alloys were estimated, respectively, to be 2.5 × 10−11 m2/s, 5.1 × 10−11 m2/s, and 2.8 × 10−11 m2/s for alloys, 10B22, 4615, and 4720, respectively, which agree with the values found in the literature for α-iron. Moreover, the sample entropy, on average, increased with respect to the heating time, and, consequently, the amount of carbon that had diffused into the alloy. The above results show that the complexity of the serration behavior in the alloys studied increases with respect to the amount of carbon that has diffused into the material.

Original languageEnglish
Pages (from-to)135-145
Number of pages11
JournalMaterials Science and Engineering: A
Volume753
DOIs
StatePublished - Apr 10 2019
Externally publishedYes

Funding

Funding: The authors are grateful to the financial supports from the Columbus McKinnon Corporation, Lab-Directed Research and Development (LDRD) at the Oak Ridge National Laboratory, and the Center for Materials Processing at The University of Tennessee. X. X. and P. K. L. are extremely thankful for the gracious funding from the U.S. Department of Energy (DOE) Office of Fossil Energy, the National Science Foundation (DMR-1611180, and DMR-1809640), and the National Energy Technology Laboratory (NETL) (DE-FE0008855, DE-FE-0024054, and DE-FE-0011194), with program managers Drs. D. Farkas, V. Cedro, S. Markovich, G. Shiflet, J. Mullen, and R. Dunts. B. C. and P. K. L. would like to acknowledge the financial support of Columbus McKinnon. The current project utilized resources available at the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Funding : The authors are grateful to the financial supports from the Columbus McKinnon Corporation , Lab-Directed Research and Development (LDRD) at the Oak Ridge National Laboratory , and the Center for Materials Processing at The University of Tennessee . X. X. and P. K. L. are extremely thankful for the gracious funding from the U.S. Department of Energy (DOE) Office of Fossil Energy , the National Science Foundation ( DMR-1611180 , and DMR-1809640 ), and the National Energy Technology Laboratory (NETL) ( DE-FE0008855 , DE-FE-0024054 , and DE-FE-0011194 ), with program managers Drs. D. Farkas, V. Cedro, S. Markovich, G. Shiflet, J. Mullen, and R. Dunts. B. C. and P. K. L. would like to acknowledge the financial support of Columbus McKinnon . The current project utilized resources available at the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357 .

Keywords

  • Hardness
  • Iron alloys
  • Modeling/simulations
  • Plasticity
  • Stress/strain measurements

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