|About this Abstract
||Materials Science & Technology 2012
||Steel Product Metallurgy and Applications
||Effect of Alloying Elements on Reverse Austenite Grain Size from Martensitic Microstructure of Low Alloy Carbon Steel
||Ueda Yukimasa, Arai Yuji, Kondo Kunio
|On-Site Speaker (Planned)
The microstructure reheated from martensitic microstructure of low alloy steels is investigated in order to clarify the effect of carbon content on reverse austenite grain size. Fe-Mn-Cr-Nb alloys with varying C content specimens are quenched and then reheated slowly to various temperatures in order to clarify reverse transformation behavior. The increase of carbon content leads to the reduction of reverse austenite grain size. In the case of 0.05%C steel, coarse grain is produced due to the coalescence of acicular reverse austenite formed at lath boundaries. This acicular reverse austenite has the same crystal orientation as that of parent austenite. In the case of 0.25%C steel, fine grain is produced due to the growth of granular reverse austenite formed at prior austenite grain boundaries. This granular reverse austenite has several crystal orientations. It is concluded that the decrease in grain size can be attributed to the growth of granular reverse austenite.
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