Authors: Z H Cong N Jia X Sun Y Ren J Almer Y D Wang
Publish Date: 2009/04/08
Volume: 40, Issue: 6, Pages: 1383-1387
Abstract
The direct measurement of the stress or strain partitioning during deformation in the materials consisting of two phases with the same crystallographic structure and different microstructures is still difficult so far This is due to the fact that no effective characterization tool is available with the ability to distinguish the local strain and stress at microscale level In this article we studied the micromechanical behavior of ferrite/martensite dualphase DP alloys using the insitu highenergy Xray diffraction HEXRD technique We established a new method to separate the stress and strain in the ferrite and martensite during loading Although the ferrite and martensite exhibit the same crystal structure with similar lattice parameters the dependence of 200 lattice strains on the applied stress is obviously different for each phase A viscoplastic selfconsistent VPSC model which can simulate the micromechanical behavior of twophase materials was used to construct the respective constitutive laws for both phases from the experimental lattice strains and to fit the macrostressstrain curve The material parameters for each phase extracted from our experiments and simulations could be used for designing other DP alloys and optimizing some complex industrial processesPacific Northwest National Laboratory is operated by the Battelle Memorial Institute for the United States Department of Energy under Contract No DEAC0576RL01830 This work was funded by the Department of Energy Office of FreedomCAR and Vehicle Technologies under the Automotive Lightweighting Materials Program managed by Dr Joseph Carpenter and the National Natural Science Foundation of China Grant Nos 50671022 and 50725102 Use of the APS was supported by the United States Department of Energy Office of Science Laboratory under Contract No DEAC0206CH11357
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