ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Grain Boundary Engineering of 10% Cr Ferritic-Martensitic Steel SUH3
Kyosuke HirayamaYonosuke YoshiiYasuhiro MorizonoSadahiro TsurekawaYasuyosi Hidaka
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2015 Volume 55 Issue 9 Pages 1973-1979

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Abstract

Thermomechanical treatments for manipulating grain boundary microstructure in 10 wt%Cr ferritic-martensitic steel SUH3 have been studied. Material with a high fraction of coincidence site lattice (CSL) boundaries was successfully produced and subjected to steam oxidation tests to demonstrate the utility of grain boundary engineering. Introducing a high fraction of twin boundaries in austenite resulted in a significant increase in the number of CSL boundaries along the prior austenite grain boundaries in martensite. In addition, grain boundary engineering introduced a high density of subblock structures in martensite, which resulted in a homogeneous distribution of fine precipitates in tempered martensite. Steam oxidation tests demonstrated that grain boundary engineering for SUH3 steel can achieve enhanced oxidation resistance.

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© 2015 by The Iron and Steel Institute of Japan
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