Modeling and experiment on microstructure evolutions and mechanical properties in grade 600 MPa reinforcing steel rebar subjected to TempCore process

Kaushik Bandyopadhyay, Joonho Lee, Jae Hyeok Shim, Byoungchul Hwang, Myoung Gyu Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, finite element (FE) modeling of the microstructure evolutions and resultant mechanical properties in the grade 600 MPa steel bar subjected to the TempCore process, a thermo-mechanically controlled process involving quenching and self-tempering, and related experiments are presented. The phase transformation kinetics based on the Johnson–Mehl–Avrami–Kolmogorov (JMAK) and Koistinen–Marburger equations were implemented in the user-defined subroutine of FE software to consider diffusional and martensitic transformations, respectively. Moreover, a robust simulation approach for solving complex thermo-mechanical problems induced by the quenching (i.e., external water cooling), internally generated heat due to phase transformations, and heat transfers between core and surface were addressed. The developed model can also simulate deformations associated with temperature change, phase transformations, and mechanical plasticity. The developed model was validated by estimating evolutions of various phase fractions and hardness in steel bars produced by both TempCore and normal air-cooling, which were compared with corresponding experimental results. Finally, prediction of flow stress curves and their experimental validation were also performed.

Original languageEnglish
Pages (from-to)39-52
Number of pages14
JournalMaterials Science and Engineering A
Volume745
DOIs
Publication statusPublished - 2019 Feb 4

Keywords

  • JMAK model, Finite element model
  • Non-isothermal phase transformation
  • TempCore process
  • Thermal analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Modeling and experiment on microstructure evolutions and mechanical properties in grade 600 MPa reinforcing steel rebar subjected to TempCore process'. Together they form a unique fingerprint.

  • Cite this