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Open AccessArticle

On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4

1
Centre for Engineering Materials (MPA-IfW), Technical University of Darmstadt, Grafenstraße 2, 64283 Darmstadt, Germany
2
Institute of Materials Design and Structural Integrity, Osnabrück University of Applied Sciences, Albrechtstraße 30, 49009 Osnabrück, Germany
3
IEHK Steel Institute, RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany
*
Author to whom correspondence should be addressed.
Metals 2020, 10(11), 1458; https://doi.org/10.3390/met10111458
Received: 5 October 2020 / Revised: 26 October 2020 / Accepted: 27 October 2020 / Published: 30 October 2020
(This article belongs to the Special Issue Fatigue and Fracture of Traditional and Advanced Structural Alloys)
In this study, we investigate the influence of control type and strain rate on the lifetime of specimens manufactured from 50CrMo4. This influence is described by a strain rate dependent method that uses cyclic stress strain curves to correct displacement-controlled cyclic test results. The objective of this correction is to eliminate the stress related differences between displacement-controlled cyclic test results and force-controlled cyclic test results. The method is applied to the results of ultrasonic fatigue tests of six different combinations of heat treatment, specimen geometry (notch factor) and atmosphere. In a statistical analysis, the corrected results show an improved agreement with test results obtained on conventional fatigue testing equipment with similar specimens: the standard deviation in combined data sets is significantly reduced (p = 4.1%). We discuss the literature on intrinsic and extrinsic strain rate effects in carbon steels. View Full-Text
Keywords: ultrasonic cyclic testing; frequency effect; control type effect; strain rate effect; 50CrMo4; SAE 4150; high cycle fatigue; very high cycle fatigue; statistical analyses ultrasonic cyclic testing; frequency effect; control type effect; strain rate effect; 50CrMo4; SAE 4150; high cycle fatigue; very high cycle fatigue; statistical analyses
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MDPI and ACS Style

Geilen, M.B.; Schönherr, J.A.; Klein, M.; Leininger, D.S.; Giertler, A.; Krupp, U.; Oechsner, M. On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4. Metals 2020, 10, 1458.

AMA Style

Geilen MB, Schönherr JA, Klein M, Leininger DS, Giertler A, Krupp U, Oechsner M. On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4. Metals. 2020; 10(11):1458.

Chicago/Turabian Style

Geilen, Max B.; Schönherr, Josef A.; Klein, Marcus; Leininger, Dominik S.; Giertler, Alexander; Krupp, Ulrich; Oechsner, Matthias. 2020. "On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4" Metals 10, no. 11: 1458.

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