Abstract
We propose that high strain-hardening in face-centered cubic (FCC) crystals containing interstitial atoms could be achieved through the formation of nanoscale hexagonal close-packed (HCP) martensite with severe lattice distortions. Our experimental results showed that carbon atoms could more effectively prevent the HCP martensite from thickening and result in the formation of nano-HCP martensite. This caused a higher strain-hardening rate in FeMnSiC steel with heavy carbon than in FeMnSiCrNi steel with trace carbon though the HCP martensite transformation kinetics was almost the same in these two steels.
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