Nucleation and three-dimensional morphology of intragranular ferrite in a vanadium microalloyed steel

Kaiming Wu and Xinlai He Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China. Lab of Three-dimensional Analysis and Characterization of Materials Microstructure; Hubei Province Key Laboratory for Refractory and Ceramics-Ministry-Province Jointly-constructed Cultivation Base for State Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China

摘 要：<正>The formation of intragranular ferrite at inclusions was analyzed by SEM-EDX in a vanadium microalloyed steel with an excess amount of sulfur. The precipitation of MnS at aluminum oxides may result in Mn depletion, which, in turn, promotes the formation of intragranular ferrite. The morphology of intragranular ferrite changed with undercooling. At higher temperatures intragranular ferrite is nearly equiaxed whereas it is plate-like at lower temperatures.

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