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- Title
Mechanical Behavior and Microstructural Development of Low-Carbon Steel and Microcomposite Steel Reinforcement Bars Deformed under Quasi-Static and Dynamic Shear Loading.
- Authors
Dougherty, L. M.; Cerreta, E. K.; Gray, G. T.; Trujillo, C. P.; Lopez, M. F.; Vecchio, K. S.; Kusinski, G. J.
- Abstract
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 strain-rate 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.
- Subjects
MECHANICAL behavior of materials; MICROSTRUCTURE; DEFORMATION of surfaces; CARBON steel; STEEL bars; COMPOSITE materials; MARTENSITE; MICROSCOPY; GEOMETRY
- Publication
Metallurgical & Materials Transactions. Part A, 2009, Vol 40, Issue 8, p1835
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-009-9869-2