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

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:802

Article

Hofinger, Matthias¹  Seisenbacher, Benjamin²  Landefeld, Andreas¹  Ognianov, Miloslav³  Turk, Christoph³  Leitner, Harald³  Schnitzer, Ronald¹ 

[1] Univ Leoben, Dept Mat Sci, Franz Josef Str 18, A-8700 Leoben, Austria

[2] Univ Leoben, Dept Mech Engn, Franz Josef Str 18, A-8700 Leoben, Austria

[3] Voestalpine BOHLER Edelstahl GmbH & Co KG, Mariazellerstr 25, A-8605 Kapfenberg, Austria

关键词: Thermomechanical fatigue;    Atom probe tomography;    Dual hardening steel;    Hot-work tool steel;   

DOI  :  10.1016/j.msea.2020.140672

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free