Synchrotron x-ray diffraction and crystal plasticity modeling study of martensitic transformation, texture development, and stress partitioning in deep-drawn TRIP steels

  • Peijun Hou
  • , Yuan Li
  • , Wei Zhang
  • , Dongchul Chae
  • , Jun Sang Park
  • , Yang Ren
  • , Yanfei Gao
  • , Hahn Choo

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The micromechanics of the formability of a lean duplex TRIP steel was investigated using Synchrotron X-Ray Diffraction (S-XRD) measurements and Crystal Plasticity Finite Element Modeling (CPFEM). Specifically, the effect of the ferrite phase on the reduction of stress concentrations in the martensite phase and the influence of the austenite texture on the distribution of the martensite phase in the deep-drawn duplex TRIP steel were studied in comparison to a TRIP steel case. A series of deep-drawing processes were carried out to examine the sheet formability at ambient temperature, followed by S-XRD evaluations of the phase fraction, texture, and the residual-stress distributions in the deep-drawn cups. The macroscopic residual stress and its partitioning among constituent phases were studied using both S-XRD and CPFEM. In the deep-drawn TRIP steel, large tensile hoop residual stresses concentrated in the strain-induced α’ martensite phase, correlating well with the cracking phenomenon observed. Furthermore, the initial austenite texture influenced the martensite transformation kinetics during the deep-drawing process, resulting in a heterogeneous distribution of the martensite phase fractions around the circumference of the deep-drawn cups, which, in turn, caused an orientation-dependent cracking behavior. In the deep-drawn duplex TRIP steel, the tensile hoop residual stresses in the α’ martensite phase were significantly reduced due to a favorable load partitioning to the ferrite phase, resulting in a better formability.

Original languageEnglish
Article number101162
JournalMaterialia
Volume18
DOIs
StatePublished - Aug 2021
Externally publishedYes

Funding

This research was partially funded by the U.S. National Science Foundation (NSF) Metals and Metallic Nanostructures (MMN) program under contract DMR-1308548 and DMR-1809640. This research was also supported in part by POSCO Corp. South Korea. P. Hou and H. Choo acknowledge funding from the State of Tennessee and Tennessee Higher Education Commission (THEC) through their support of the Center for Materials Processing at the University of Tennessee (UT). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This work is a part of the Ph.D. dissertation of P. Hou under the supervision of Prof. H. Choo at UT. This research was partially funded by the U.S. National Science Foundation (NSF) Metals and Metallic Nanostructures (MMN) program under contract DMR-1308548 and DMR-1809640 . This research was also supported in part by POSCO Corp., South Korea. P. Hou and H. Choo acknowledge funding from the State of Tennessee and Tennessee Higher Education Commission (THEC) through their support of the Center for Materials Processing at the University of Tennessee (UT). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357 . This work is a part of the Ph.D. dissertation of P. Hou under the supervision of Prof. H. Choo at UT.

Keywords

  • Crystal plasticity finite element model
  • Duplex TRIP steel
  • Residual stress
  • Synchrotron x-ray diffraction
  • Texture

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