ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Regular Article
Anomalous Segregation Kinetics of Phosphorus and Carbon Governed by Carbide Reactions in 2.25Cr-1.5W Heat-resistant Steel
Hyun Je SungNam Hoe HeoYoon-Uk HeoSung-Joon Kim
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2014 Volume 54 Issue 11 Pages 2643-2648

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Abstract

In a 2.25Cr-1.5W heat-resistant steel containing V and Nb, the formation sequence of carbides are detailed. Such carbide reactions determine directly the anomalous segregation kinetics of phosphorus and carbon at the grain boundary/carbide interface. The anomalous segregation kinetics of phosphorus consists of two maximum segregation peaks and one minimum peak corresponding to the high segregation concentration of carbon. The roles of the carbide reactions on the anomalous segregation kinetics of the solutes are fully understood from the viewpoint of the dissolution of unstable carbides into the matrix for forming the stable carbides, the active segregation of the dissolved carbon into the newly formed carbide interface for the growth and the resultant repulsive segregation between carbon and phosphorus.

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© 2014 by The Iron and Steel Institute of Japan
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