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Tensile Deformation Behavior of Duplex Stainless Steel Studied by In-Situ Time-of-Flight Neutron Diffraction
Northeastern University.
Linköping University, Department of Management and Engineering, Engineering Materials . Linköping University, The Institute of Technology.
Los Alamos National Laboratory.
Los Alamos National Laboratory.
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2008 (English)In: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN 1073-5623, Vol. 39A, no 13, 3134-3140 p.Article in journal (Refereed) Published
Abstract [en]

For a duplex alloy being subjected to deformation, the different mechanical behaviors of its constituent phases may lead to a nonuniform partition of stresses between phases. In addition, the grain-orientation-dependent elastic/plastic anisotropy in each phase may cause grain-to-grain interactions, which further modify the microscopic load partitioning between phases. In the current work, neutron diffraction experiments on the spectrometer for materials research at temperature and stress (SMARTS) were performed on an austenite-ferrite stainless steel for tracing the evolution of various microstresses during tensile loading, with particular emphasis on the load sharing among grains with different crystallographic orientations. The anisotropic elastic/plastic properties of the duplex steel were simulated using a visco-plastic self-consistent (VPSC) model that can predict the phase stress and the grain-orientation-dependent stress. Material parameters used for describing the constitutive laws of each phase were determined from the measured lattice strain distributions for different diffraction {hkl} planes as well as the laboratorial macroscopic stress-strain curve of the duplex steel. The present investigations provide in-depth understanding of the anisotropic micromechanical behavior of the duplex steel during tensile deformation.

Place, publisher, year, edition, pages
2008. Vol. 39A, no 13, 3134-3140 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-16130DOI: 10.1007/s11661-008-9675-2OAI: diva2:133215
Available from: 2009-01-08 Created: 2009-01-07 Last updated: 2010-12-02

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Peng, Ru
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Engineering Materials The Institute of Technology
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