ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of Surface Mechanical Attrition Treatment on Microstructure and Oxidation Behavior in T91 Steel at High Temperature
Zhi-xin XiaChi ZhangWen-bo LiuZhi-gang Yang
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2014 Volume 54 Issue 8 Pages 1935-1942

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Abstract

Traditional techniques and methods can not resolve the contradictions of the microstructure requirement between creep resistance and oxidation resistance in T91 steel at high temperature. In the present work, oxidation resistance of T91 steel were successfully improved by surface mechanical attrition treatment (SMAT). The variations of ferrite grains and precipitation behavior in the surface layer at different tempering temperature were also observed to investigate thermal stability. A FeCr2O4 spinel inner layer with higher Cr content could rapidly form and protect the material from further oxidation in T91 steel due to the nanocrystalline surface layer.

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© 2014 by The Iron and Steel Institute of Japan
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