Influence of thermomechanical fatigue loading conditions on the nanostructure of secondary hardening steels

Matthias Hofinger, Benjamin Seisenbacher, Andreas Landefeld, Miloslav Ognianov, Christoph Turk, Harald Leitner, Ronald Schnitzer

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Dual hardening steels reach their well-balanced mechanical properties in terms of strength and toughness through the combination of secondary hardening carbide and intermetallic particle precipitation. This characteristic profile makes them well suited for hot-work applications. In this study, out-of-phase thermomechanical fatigue tests, recreating operating conditions present during hot-work applications, were performed on a dual hardening steel and a 5% Cr martensitic hot-work tool steel. Via high resolution analysis utilizing atom probe tomography and transmission electron microscopy, the behaviour of the different precipitate populations under combined thermal and mechanical loading conditions were compared. Coarsening of the different precipitates and partial dissolution of the intermetallic compounds was observed. It could be shown that with rising maximum fatigue test temperature, the dual hardening steel reaches an increased lifetime caused by its higher tempering resistance.

Original languageEnglish
Article number140672
Number of pages11
JournalMaterials science and engineering: A, Structural materials: properties, microstructure and processing
Issue number20 January
Publication statusPublished - 20 Jan 2021

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