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Mechanical behavior and microstructural development of low-carbon steel and microcomposite steel reinforcement bars deformed under quasi-static and dynamic shear loading
Reinforcement bars of microcomposite (MC) steel, composed of lath martensite and minor amounts of retained austenite, possess improved strength and corrosion characteristics over low-carbon (LC) steel rebar; however, their performance under shear loading has not previously been investigated at the microstructural level. In this study, LC and MC steel cylinders were compression tested, and specimens machined into a forced-shear geometry were subjected to quasi-static and dynamic shear loading to determine their shear behavior as a function of the strain and strain rate. The as-received and sheared microstructures were examined using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). Higher-resolution microstructural examinations were performed using transmission electron microscopy (TEM). The influence of the starting microstructure on the shear behavior was found to depend strongly on the strain rate; the MC steel exhibited not only greater strainrate sensitivity than the LC steel but also a greater resistance to shear localization with load. In both steels, despite differences in the starting microstructure, post-mortem observations were consistent with a continuous mechanism operating within adiabatic shear bands (ASBs), in which subgrains rotated into highly misoriented grains containing a high density of dislocations.
Mechanical behavior and microstructural development of low-carbon steel and microcomposite steel reinforcement bars deformed under quasi-static and dynamic shear loading
Reinforcement bars of microcomposite (MC) steel, composed of lath martensite and minor amounts of retained austenite, possess improved strength and corrosion characteristics over low-carbon (LC) steel rebar; however, their performance under shear loading has not previously been investigated at the microstructural level. In this study, LC and MC steel cylinders were compression tested, and specimens machined into a forced-shear geometry were subjected to quasi-static and dynamic shear loading to determine their shear behavior as a function of the strain and strain rate. The as-received and sheared microstructures were examined using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). Higher-resolution microstructural examinations were performed using transmission electron microscopy (TEM). The influence of the starting microstructure on the shear behavior was found to depend strongly on the strain rate; the MC steel exhibited not only greater strainrate sensitivity than the LC steel but also a greater resistance to shear localization with load. In both steels, despite differences in the starting microstructure, post-mortem observations were consistent with a continuous mechanism operating within adiabatic shear bands (ASBs), in which subgrains rotated into highly misoriented grains containing a high density of dislocations.
Mechanical behavior and microstructural development of low-carbon steel and microcomposite steel reinforcement bars deformed under quasi-static and dynamic shear loading
Dougherty, L.M. (author) / Cerreta, E.K. (author) / Gray, G.T. III (author) / Trujillo, C.P. (author) / Lopez, M.F. (author) / Vecchio, K.S. (author) / Kusinski, G.J. (author)
2009
16 Seiten, 17 Bilder, 1 Tabelle, 44 Quellen
Article (Journal)
English
adiabatische Bedingung , Bewehrungsstahl , Chromzusatz , Dehnungsgeschwindigkeit , dynamische Beanspruchung , Festigkeitserhöhung , kohlenstoffarmer Stahl , martensitische Phase , martensitische Umwandlung , Mikrostruktur , optische Mikroskopie , Rasterelektronenmikroskopie , Restaustenit , Scherbeanspruchung , Scherfestigkeit , Stab , Strukturanalyse , Transmissionselektronenmikroskopie , Zylinder (Körper)
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