ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Influence of Tempering Temperature on Low Cycle Fatigue of High Strength Steel
Hyuksun KwonFrédéric BarlatMyounggyu LeeYounil ChungSangho Uhm
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2014 Volume 54 Issue 4 Pages 979-984

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Abstract

In this study, the mechanical and low cycle fatigue properties for a heat-treatment steel subjected to quenching and tempering (QT) were evaluated. The steel had a modified chemical composition with respect to a conventional material and was subjected to tempering at various temperatures. It was shown that the material tempered at 250°C exhibited superior fatigue properties in the short life regions. Carbon atom clusters in concentration of 18 at% in martensite were observed using atom probe tomography (APT) for the steel tempered at 250°C. It is believed that these clusters contribute to the improvement of fatigue properties by hindering the motion of dislocations.

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© 2014 by The Iron and Steel Institute of Japan
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