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Effect of Strain Localization on the Mechanical Properties from Nonuniform Grain Size Distribution of Ultralow Carbon Steel
The effect of the bimodal grain size distribution in the range of several tens of micrometers is studied to investigate the mechanical properties of metallic materials with single-phase ferritic microstructure. The previous studies on the bimodal distribution of grain size have been performed on materials with nanocrystalline, ultrafine, or multiphase microstructures, and have generally reported that the mixed structure of fine and coarse grains improves the ductility of the material, because the coarser grains preferentially accommodate deformation. However, herein, the coarse grains do not accept the deformation well during plastic deformation and cause nonuniform deformation, which lowers the work hardening coefficient and accelerates necking of sheet. The influence of the bimodal grain size distribution on the mechanical properties is evaluated using tensile and various formability tests. Microstructural changes before and after deformation are tracked by electron backscatter diffraction.
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Steel Research InternationalVolume
94Publisher DOI
ISSN
1611-3683eISSN
1869-344XLanguage
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
2Publisher
WILEY-V C H VERLAG GMBHUsage metrics
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Keywords
Science & TechnologyTechnologyMetallurgy & Metallurgical Engineeringabnormal grain growthbimodal distributionsmicrostructuresneckingstrain localizationTEXTURETIMaterials Engineering not elsewhere classifiedResources Engineering and Extractive Metallurgy not elsewhere classifiedManufacturing Engineering not elsewhere classified
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