The lattice strain tensor evolution for single bulk grains of austenite and ferrite in a duplex stainless steel during tensile loading to 0.02 applied strain has been investigated using in situ high-energy X-ray measurements and finite-element modeling. Single-grain X-ray diffraction lattice strain data for the eight austenite and seven ferrite grains measured show a large variation of residual lattice strains, which evolves upon deformation to the point where some grains with comparable crystallographic orientations have lattice strains different by 1.5 × 10-3, corresponding to a stress of ∼300 MPa. The finite-element simulations of the 15 measured grains in three different spatial arrangements confirmed the complex deformation constraint and importance of local grain environment.
Bibliographical noteFunding Information:
The Metals4D group at Risø National Laboratory is gratefully acknowledged for useful discussions and support with software. The work was financially supported by the Swedish Research Council and Outokumpu Research Foundation. Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Tong-Seok Han’s work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) KRF-2008-331-D00006 , in which parallel finite element calculations were performed by using the supercomputing resource of the Korean Institute of Science and Technology information (KISTI).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys