What is it about?

It is well established that 18 % nickel maraging steel, while exhibiting an excellent combination of strength and fracture toughness, suffers from a low fatigue strength. The present study is an attempt to increase the fatigue strength of the steel through driving the austenite reversion reaction to a controlled extent. The study covers investigation of effect of up to 12 % volume fraction of reverted austenite on the fatigue strength of 18 % nickel maraging steel. The findings show that reverted austenite with a volume fraction of 2-3 % leads to substantial improvement in fatigue life.

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Why is it important?

The use of 18 % Ni maraging steel has hitherto been restricted, when it comes to applications involving fatigue type of loading. Version of the steel with improved fatigue life make the steel much more versatile in terms of the uses to which it can be put to. For applications demanding combination of high strength under both monotonic and fatigue type of loading, the designer can now look to this version of the steel.


This work is an outcome of the doctoral research carried out by Mr. Rohit Benjamin under my supervision. The steel studied is 18Ni250 (C18Ni1700) grade maraging steel. It is the most used steel in terms of volumes among the different grades of the family of 18 % nickel maraging steels. Findings of this study are expected to find a more wide - ranging spectrum of applications for the steel, particularly in strategic industries.

Nageswara Rao Muktinutalapati

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This page is a summary of: Influence of reverted austenite on fatigue life of 18 % nickel maraging steel, Materialwissenschaft und Werkstofftechnik, October 2023, Wiley,
DOI: 10.1002/mawe.202200183.
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