Construction and Steel Structure

Biography

Biography: Dinesh Kumar

Abstract

High manganese steels are widely used in automobile industry and structural applications because of having outstanding mechanical properties. In high manganese category, TWIP Steel with high manganese content offers excellent strength ductility combination for automobile industry while High manganese TRIP steel and Hadfield steel offers higher strength with lower elongation as compared with TWIP steel. In this work different compositions of high manganese steels with carbon range (0.15-0.5 wt %) has been selected and subjected to quenching test and tensile test. Microstructure analysis has been done through optical microscopy and Scanning electron microscopy. XRD analysis has been done for identification and phase fraction calculation of austenite and martensite phases during quenching and tensile test. Stacking fault energy and stacking fault probability was calculated to show the effect of it on different phase formations. Formation of Twinning was observed in high carbon steel (TWIP) during tensile test while ε and α' martensite was found to be formed in low carbon high manganese steel during quenching test and tensile test. Stacking faults and stacking fault probability increases with increase in grain size without large variation. Mechanical properties of the steels were varying with the presence of twinning and martensite. Twinning offers a tensile strength of 940MPa and 62% elongation in steel with carbon 0.5 wt % while presence of martensite in low carbon steels (0.15-0.35 wt%) steels offers a tensile strength of 620 to 808 MPa and elongation of 22 to 42%.