Effect of Distribution of TiN Precipitate Particles on the Austenite Grain Size of Low Carbon Low Alloy Steels

Th e effect of TiN p articles ill low carbon low allo)' steels 011 the austellite graill size was studied in relation to tlte dissolutioll , coalescence and reprecipitation.Nlain results were as follows.(I) Ostwald ripening was observed in the process of coalescence of TiN jJarticles.( 2) Thg main factors COli trolling tlte austellite grain size (R ) w ere th e volume fraction (j) and th e meall size of TiN particles (r) sllch that R = K .(rlf) , where the (r ff ) is tlte mean distance of Ti N particles.(3) This experimental/;, obtained relatiol/ship was th eoretically substantiated by a simple model that takes both the effect of distribution of T iN precijJilate !Jarticles and th e lIatllre of the particles into considera tion.