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Synopsis: The effects of niobium in steels on austenite grain size and its coarsening behaviour were investigated in relation to the precipitation of niobium carbonitride. The main results may be summarized as follows: 1) The grain refining effect of niobium in steels is mainly atributable to the retardening effect of Nb (CN) precipitates on the growth of the initial austenite grains formed just after ƒ¿-ƒÁ, transformation. 2) Onisothermal treatment, the coagulation of Nb (CN) precipitates causes the abnormal grain

Effect of Niobium Addition on Austenite Grain Size in Steels