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Crack initiation in the very high cycle fatigue regime of nitrided 42CrMo4 steel

Published online by Cambridge University Press:  07 August 2017

Anja Weidner ,
Tim Lippmann  and
Horst Biermann
Anja Weidner*
Affiliation:
Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg 09599, Germany
Tim Lippmann
Affiliation:
Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg 09599, Germany
Horst Biermann
Affiliation:
Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg 09599, Germany
*
a) Address all correspondence to this author. e-mail: weidner@ww.tu-freiberg.de
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Abstract

Surface treatments such as shot peening, deep rolling, or nitriding are known to be very effective for the protection of a surface against fatigue crack initiation, due to surface hardening and residual compressive stresses introduced below the surface. Thus, crack initiation of cyclically loaded materials occurs predominantly at internal nonmetallic inclusions (NMIs). Two different plasma-nitriding treatments were performed on a quenched and tempered 42CrMo4 cast steel. Ultrasonic fatigue tests were performed up to 109 cycles. Resonant frequency and the nonlinearity parameter were recorded in situ during the fatigue tests. Fractographic analyses were performed by means of scanning electron microscopy in combination with energy-dispersive X-ray spectroscopy. The results showed that nitriding, as expected, led to improvements in both fatigue life and rates of internal crack initiation at NMIs. However, the analysis of in situ parameters revealed that internal crack initiation occurred at stress amplitude levels well below the failure stress amplitude even for repeated loading until the run-out limit of 109 cycles.

Keywords

very high cycle fatigueplasma-nitridingfisheye fracturenon-metallic inclusion
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 23: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART A , 14 December 2017 , pp. 4305 - 4316
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Gary L. Messing

References

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