Abstract
Real-time in situ neutron diffraction was used to investigate the loading-direction dependence of phase-specific load sharing in a cold-rolled TRIP 780 sheet steel under tension at room temperature. A slightly lower yield stress and relatively faster initial strain hardening were observed for the tension along the rolling direction (RD) than those along the transverse direction (TD) and the diagonal direction (DD). In all three loading directions, the redistribution of inter-phase and inter-granular load sharing occurs upon the yields of the body centered cubic (BCC) matrix and the face centered cubic (FCC) phase. The FCC phase is found to yield earlier along the RD than those along the TD and DD. The quantitative evolution of phase-specific stress indicates a rapid strain hardening in the FCC phase after yielding during the RD tension. Possible mechanisms of the direction-dependent phase-specific load sharing are discussed in association with the different initial textures in the RD, DD and TD.
| Original language | English |
|---|---|
| Pages (from-to) | 1576-1586 |
| Number of pages | 11 |
| Journal | JOM |
| Volume | 70 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 1 2018 |
Funding
The neutron scattering experiment was carried out at the Spallation Neutron Source (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences. D.Y. thanks the support of the ORNL-UTK SWC IAP program. The authors thank Mr. M.J. Frost from SNS for the technical support. L.H. and P.K. would like to thank the United States Steel Corporation for the permission to publish the data in this paper. The material in this paper is intended for general information only. Any use of this material in relation to any specific application should be based on independent examination and verification of its unrestricted availability for such use and a determination of suitability for the application by professionally qualified personnel. No license under any patents or other proprietary interests is implied by the publication of this paper. Those making use of or relying upon the material assume all risks and liability arising from such use or reliance.
| Funders | Funder number |
|---|---|
| Office of Basic Energy Sciences | |
| Scientific User Facilities Division | |
| United States Steel Corporation | |
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | |
| Status of Women Canada |