Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel

Amin Khayatzadeh; Jan Sippel; Stefan Guth; Karl-Heinz Lang; Eberhard Kerscher

doi:10.3390/met12020204

Metals (Jan 2022)

Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel

Amin Khayatzadeh,
Jan Sippel,
Stefan Guth,
Karl-Heinz Lang,
Eberhard Kerscher

Affiliations

Amin Khayatzadeh: Institute for Applied Materials (IAM-WK), Department of Mechanical Engineering, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
Jan Sippel: Materials Testing, Department of Mechanical and Process Engineering, University of Kaiserslautern, Gottlieb-Daimler-Str., 67663 Kaiserslautern, Germany
Stefan Guth: Institute for Applied Materials (IAM-WK), Department of Mechanical Engineering, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
Karl-Heinz Lang: Institute for Applied Materials (IAM-WK), Department of Mechanical Engineering, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
Eberhard Kerscher: Materials Testing, Department of Mechanical and Process Engineering, University of Kaiserslautern, Gottlieb-Daimler-Str., 67663 Kaiserslautern, Germany

DOI: https://doi.org/10.3390/met12020204
Journal volume & issue: Vol. 12, no. 2
p. 204

Abstract

Read online

A thermo-mechanical treatment (TMT) at the temperature of maximum dynamic strain aging has been optimized and performed on quenched and tempered steel SAE4140H (German designation: 42CrMo4) in order to improve the fatigue limit in the high cycle fatigue (HCF) and and very high cycle fatigue (VHCF) regimes. Fatigue tests, with ultimate cycle numbers of 107 and 109, have shown that the TMT can increase both the fatigue lifetime and the fatigue limit in the HCF and VHCF regimes. The increased stress intensity factors of the critical inclusions after the TMT indicate that the effect can be attributed to a stabilized microstructure around critical crack-initiating inclusions through the locking of edge dislocations by carbon atoms during the TMT.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

About the journal

Abstract

Keywords