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Analysis of the Residual Stress in Zirconium Subjected to Surface Severe Plastic Deformation
Yaomian Wang,Huanping Yang,Conghui Zhang,Fei Yu 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2
The residual stress of commercially pure zirconium specimens subjected to surface mechanical attritiontreatment (SMAT) for different durations is measured with X-ray diffraction (XRD). XRD peak broadeninganalysis is conducted to obtain the distributions of the crystallite size, microstrain and dislocation densityas functions of the depth from the processed surface. Finite element modeling is performed to revealthe characteristics of the residual stress distribution. Microstructure observation using optical and electronmicroscopy are also carried out in order to elucidate the residual stress development. The correlationsbetween the microstructure features and the residual stress distribution in zirconium are examined. Theresults indicate that a more pronounced compressive residual stress field can be generated by the SMATprocess compared to that obtained by conventional shot peening, and that the compressive residual stressdistributions exhibit nonlinear variation with the distributions of the full width at the half maximum of theXRD profiles and the dislocation densities.
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