Journal
MATERIALS CHARACTERIZATION
Volume 164, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110316
Keywords
High-Mn lightweight steel; Serration; Dynamic strain aging (DSA); kappa-Carbide; Activation energy
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Funding
- materials and component technology development program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [10048157]
- Engineering Research Center (ERC) program - Ministry of Education, Science and Technology (MEST, Korea) [2011-0030058]
- fundamental R&D program (Development of technologies for commercial manufacturing of light-weight steels for power plant components) of Korea Institute of Materials Science (KIMS) [PNK6220]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK6220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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High-Mn lightweight steel, Fe-0.9C-30Mn-8Al, was subjected to systematic examination to investigate the effects of aging heat-treatment on mechanical properties and tensile behavior as a function of test temperature from 25 to 425 degrees C and strain rate of 3.33 x 10(-4), 3.33 x 10(-3) and 3.33 x 10(-2) s(-1). Peak in the flow stress, plateau of yield strength and ultimate tensile strength as well as negative strain rate sensitivity (SRS) were observed in the steel during tensile test, which are obvious evidences of dynamic strain aging (DSA) behavior. The dislocation line bent by the dislocation-solute interaction in the as-quenched and the aged specimens was also observed by transmission election microscopy (TEM). kappa-carbide precipitated within grain and on grain boundary during aging heat-treatment improved yield strength and ultimate tensile strength and reduced percentage elongation to fracture; however, the precipitated kappa-carbide reduced the stress difference (Delta sigma) with strain interval (Delta epsilon) in stress-strain curves when DSA occurred in the steel. The activation energy for solute migration was calculated with McCormick's equation to measuring the critical strain for the onset of serration as a function of test temperature and strain rate.
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