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Volume 12
Issue 2
10.3390/met12020204
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Article

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

by
Amin Khayatzadeh
1,
Jan Sippel
2,
Stefan Guth
1,
Karl-Heinz Lang
1 and
Eberhard Kerscher
2,*
1
Institute for Applied Materials (IAM-WK), Department of Mechanical Engineering, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
2
Materials Testing, Department of Mechanical and Process Engineering, University of Kaiserslautern, Gottlieb-Daimler-Str., 67663 Kaiserslautern, Germany
*
Author to whom correspondence should be addressed.
Metals 2022, 12(2), 204; https://doi.org/10.3390/met12020204
Submission received: 9 December 2021 / Revised: 13 January 2022 / Accepted: 17 January 2022 / Published: 22 January 2022
(This article belongs to the Special Issue Thermomechanical Treatment of Metals and Alloys)
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Abstract

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.
Keywords: high-strength steel; thermo-mechanical treatment (TMT); dynamic strain aging (DSA); high cycle fatigue (HCF); very high cycle fatigue (VHCF); fine granular area (FGA); crack initiation; inclusion high-strength steel; thermo-mechanical treatment (TMT); dynamic strain aging (DSA); high cycle fatigue (HCF); very high cycle fatigue (VHCF); fine granular area (FGA); crack initiation; inclusion

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MDPI and ACS Style

Khayatzadeh, A.; Sippel, J.; Guth, S.; Lang, K.-H.; Kerscher, E. Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel. Metals 2022, 12, 204. https://doi.org/10.3390/met12020204

AMA Style

Khayatzadeh A, Sippel J, Guth S, Lang K-H, Kerscher E. Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel. Metals. 2022; 12(2):204. https://doi.org/10.3390/met12020204

Chicago/Turabian Style

Khayatzadeh, Amin, Jan Sippel, Stefan Guth, Karl-Heinz Lang, and Eberhard Kerscher. 2022. "Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel" Metals 12, no. 2: 204. https://doi.org/10.3390/met12020204

APA Style

Khayatzadeh, A., Sippel, J., Guth, S., Lang, K.-H., & Kerscher, E. (2022). Influence of a Thermo-Mechanical Treatment on the Fatigue Lifetime and Crack Initiation Behavior of a Quenched and Tempered Steel. Metals, 12(2), 204. https://doi.org/10.3390/met12020204

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