Journal
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
Volume 109, Issue 11, Pages 927-933Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/tetsutohagane.TETSU-2023-050
Keywords
steel; pure iron; electrical resistivity; lattice defects; vacancy concentration; in-situ
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The change in lattice defects density in bcc pure iron due to tensile deformation was quantified using electrical resistivity measurements and X-ray diffraction. The results showed that the dislocation density saturated and the electrical resistivity increased with increasing plastic strain. Additionally, the migration of carbon atoms from grain interior to grain boundary via dislocation might occur at the initial stage of plastic deformation in ULCS.
Change in lattice defects density in bcc pure iron due to tensile deformation was quantified by using both electrical resistivity measurements and X-ray diffraction (XRD). As bcc pure irons, ultra-low carbon steel (ULCS) and interstitial free (IF) steel are used as the model specimen. Dislocation density evaluated using Williamson Hall method with XRD shows the saturation with the value of around 3.7x10(15) m(-1) for ULCS and around 1.4x10(15) m(-1) for IF steel after plastic strain after similar to 5%. Increase in electrical resistivity was observed with increasing plastic strain. Consequently, increase in vacancy concentration occurs with increasing plastic strain of around 0.3, such as, 2.6x10(-5) for ULCS and 3.4x10(-5) for IF steel. Additionally, the migration of carbon atoms from grain interior to grain boundary via dislocation might occur at the initial stage of plastic deformation in ULCS.
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