TY - JOUR

T1 - Influence of thermomechanical fatigue loading conditions on the nanostructure of secondary hardening steels

AU - Hofinger, Matthias

AU - Seisenbacher, Benjamin

AU - Landefeld, Andreas

AU - Ognianov, Miloslav

AU - Turk, Christoph

AU - Leitner, Harald

AU - Schnitzer, Ronald

N1 - Publisher Copyright: © 2020 The Author(s)

PY - 2021/1/20

Y1 - 2021/1/20

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85097758669&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2020.140672

DO - 10.1016/j.msea.2020.140672

M3 - Article

VL - 802.2021

JO - Materials science and engineering: A, Structural materials: properties, microstructure and processing

JF - Materials science and engineering: A, Structural materials: properties, microstructure and processing

SN - 0921-5093

IS - 20 January

M1 - 140672

ER -