Findings of Grain Coarsening Temperature and Grain Growth of Light Weight Steel Used in Automotive Industry

Abstract

Efforts havebeen made in this researchworktoobserve the grain coarsening temperature (GCT) by keeping in view the formation of second phase particles. Threesteels having different chemical compositions were heat treatedat seriesof temperatures i-e 850°C, 925°C,1000°C, 1100°Cand 1175°C with holding time of 1 hour and 2 hours respectively. After revealing the microstructure grainsize distribution at each temperature was calculated by using matrox inspector and the result was plotted with origin data analysis software. It was found that presence of second phase particlescan affect the grain growth phenomena in the experimental steels and also grain growth have consequences on grain coarsening temperature on the steel under investigation.Steel A(Nb-Al) showed the finest grain structure, Grain size of steel B(Nb) was slightly higherthan that of steel A. In steel C(Al), AlN particles did not exist. The only particlespresent were of TiN. Hence, the mean grain size of steel Cwas higher than that of steel Aand steel B.