Journal
METALS
Volume 11, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/met11010024
Keywords
twinning-induced plasticity (TWIP); transformation-induced plasticity (TRIP); twinning; dynamic strain aging; serrations; dislocation glide
Funding
- National Agency for Research and Development (ANID)/Scholarship Program/DOCTORADO BECAS CHILE/2019 [21190016]
- DICYT, Direccion de Investigaciones Cientificas y Tecnologicas from Universidad de Santiago de Chile [052014MG]
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This article focuses on the mechanical behavior and microstructural changes observed in two high-manganese steels with different carbon contents, impacting the TWIP and TRIP effects. Tensile tests revealed distinct fracture micro-mechanisms in the two steels.
This article is focused on the mechanical behavior and its relationship with the microstructural changes observed in two high-manganese steels presenting twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP), namely Steel B and Steel C, respectively. Chemical compositions were similar in manganese, but carbon content of Steel B approximately doubles Steel C, which directly impacted on the stacking fault energy (SFE), microstructure and mechanical response of each alloy. Characterization of as-cast condition by optical microscope revealed a fully austenitic microstructure in Steel B and a mixed microstructure in Steel C consisting of austenite grains and thermal-induced (epsilon(t)) martensite platelets. Same phases were observed after the thermo-mechanical treatment and tensile tests, corroborated by means of X-Ray Diffraction (XRD), which confirms no phase transformation in Steel B and TRIP effect in Steel C, due to the strain-induced gamma(FCC)->epsilon(HCP) transformation that results in an increase in the epsilon-martensite volume fraction. Higher values of ultimate tensile strength, yield stress, ductility and impact toughness were obtained for Steel B. Significant microstructural changes were revealed in tensile specimens as a consequence of the operating hardening mechanisms. Scanning Electron Microscopy (SEM) observations on the tensile and impact test specimens showed differences in fracture micro-mechanisms.
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