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| Main Authors: | , , , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2025
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| Subjects: | |
| Online Access: | https://onlinelibrary.wiley.com/doi/10.1111/ffe.14521 |
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Table of Contents:
- Fatigue Behavior and Inclusion‐Based Lifetime Prediction of 42CrMo4 Steel Thomas Kirste Alexander Schmiedel Roman Morgenstern Anja Weidner Horst Biermann Fatigue & Fracture of Engineering Materials & Structures ABSTRACT Three variants of 42CrMo4 steel were investigated regarding the fatigue life at two test frequencies of 90 Hz and 20 kHz and temperatures up to 500°C. The materials varied in different levels of sulfur and oxygen content and steel cleanliness in terms of nonmetallic inclusions. The steels had a tempered martensitic microstructure with a hardness of 300 HV. A frequency dependence was observed only for the medium‐sulfur steel, whereas for low‐ and high‐sulfur levels, both test frequencies yielded in a common S‐N curve. The fracture surface analysis of the fatigue specimens was compared with the inclusion rating done on unloaded samples. A correlation of both methods was observed by introducing a size factor. Based on the distribution functions and by using Murakami's approach of a projected area of an inclusion, a method was developed to predict the S‐N curve. This offers the opportunity for an inclusion‐based lifetime prediction. 10.1111/ffe.14521 http://onlinelibrary.wiley.com/termsAndConditions#vor