Abstract
The growth of grain boundary carbides (GBC) has been followed after heating to 920 °C and cooling at 40 and 150 °C/min. In pearlite free steel at single Mn. level, on cooling to room temperature all the carbon in solution in ferrite is able to precipitate as carbides at the boundaries and the grain boundary carbides thickness depends on the number of nucleation sites for precipitation. Increasing cooling rate increased these sites and reduced the carbide thickness.
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