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Research on Carbide Precipitation in Nb-Microalloyed 9310 Steel
Author(s): 
Pages: 106-109
Year: Issue:  4
Journal: Hot Working Technology

Keyword:  Nb micro-alloying9310 steelprecipitated phasegrain coarsening;
Abstract: By theoretical calculation of volume fraction and particle radius of precipitates phase in 9310 steel with different content of Nb, by the observation of the microstructure of test steel, the carbide precipitation regularity in Nb-microalloyed 9310 steel was studied. The results show that, with the heating temperature increasing, the amount of dissolved Nb in steel gradually increases, the amount of undissolved Nb and the volume fraction of precipitation NbC phase decrease gradually, and Oswald ripening happens at the same time; when the temperature is 1050 ℃, the particles precipitate radius of steel containing Nb is not less than 50 nm, when the temperature is higher than 1150 ℃, the content of 0.047% Nb in steel can dissolve completely. The grain boundary is pinned by NbC particles in Nb-microalloyed 9310 steel, and the austenite grain coarsening is effectively prevented. The grain coarsening temperature increases from 1000 ℃ into 1150 ℃.
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