MICROSTRUCTURAL CHARACTERIZATION OF Fe-Mn-C TERNARY ALLOY UNDER NEAR-RAPID SOLIDIFICATION

摘要

This paper focus on the influence of carbon content and cooling rate on the microstructure and phase formation of Fe-Mn-C alloys under near-rapid solidification. When manganese content is about llwt.%, more e-martensite can be obtained with cooling rate increasing when carbon content is 0.14wt.%, the formed phase changed from a phase to y phase when 0.74wt.% carbon is added to the samples, and when carbon content up to 2.1 wt.%, carbide can be obtained in the sample. A host of stacking fault, which attributes to the strain-induced martensite, can be observed in the sample. The microhardness increased with cooling rate increasing, and under the same cooling rate, the microhardness of samples with 0.14wt.% carbon is highest.