| Issue |
MATEC Web Conf.
Volume 349, 2021
6th International Conference of Engineering Against Failure (ICEAF-VI 2021)
|
|
|---|---|---|
| Article Number | 04007 | |
| Number of page(s) | 8 | |
| Section | Mechanical Characterization and Numerical Analysis of Components and Structural Elements | |
| DOI | https://doi.org/10.1051/matecconf/202134904007 | |
| Published online | 15 November 2021 | |
On the effects of heat and surface treatment on the fatigue performance of high-strength leaf springs
1 Aristotle University of Thessaloniki, Laboratory of Machine Elements and Machine Design, 54124 University Campus Building D, Thessaloniki, Greece
2 SOGEFI suspensions heavy duty Italy SRL, 25080 Via Natonale 7, Puegnago sul Garda, Frazione Raffa, Italy
3 Hochschule Bochum, 44801, Lennerhofstraße 140, Bochum, Germany
4 Aristotle University of Thessaloniki, Physical Metallurgy Laboratory, 54124 University Campus Building D, Thessaloniki, Greece
* Corresponding author: mmalikou@auth.gr
Leaf springs constitute the most effective suspension way of commercial vehicle axles from the cost and maintainability point of view. Especially in case of front axles, they overtake both the guidance and suspension functions, which consequently designates them as safety components, whose pre-mature failure is explicitly prohibited. The present paper deals with the fatigue performance of downsized parabolic leaf specimens made of the high-strength spring steel 51CrV4 under serial manufacturing conditions. It focuses on the influence of the major manufacturing steps, i.e. the heat treatment and the subsequently applied stress shot peening. The effectiveness of the applied heat treatment on the microstructure transformation and the extent of surface decarburization is determined by means of optical microscopy and corresponding microstructural analyses. Comprehensive series of constant amplitude fatigue tests are executed before and after the applied stress shot peening to quantify its effectiveness on the fatigue performance. The tests cover two characteristic stress ratios of operational significance with the complete range of interest being experimentally investigated. Additionally, surface residual stresses measurements together with micro- and macro-hardness and roughness values before and after stress shot peening are executed to expose the influence of each individual technological effect on the overall fatigue performance.
© The Authors, published by EDP Sciences, 2021
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