Research Topic

Short Title	Fatigue Strength Nitrided Gears
Start of Project	Q1/2025
Funding	FVA-Nr. 615/IV, IGF-Nr. 01IF23516N / FE 2 Federal Ministry for Economic Affairs and Climate Action, BMWK
Project Partner	Leibniz-Institut für Werkstofforientierte Technologien, IWT
Contact	Dr.-Ing. T. Tobie

Project Description

The fatigue strength design of highly stressed components is becoming increasingly important in terms of resource efficiency and lightweight construction. Even today, numerous practical applications are not designed according to the endurance limit, but are designed for their service life in order to leverage the corresponding potential of power density and to save weight. Thermochemical surface layer heat treatment processes, such as nitriding, significantly improve the performance properties of gears compared to the hardened and tempered base material.

However, results from previous projects [1, 2] confirm an increased overload sensitivity of nitrided gears in the area of fatigue strength known from the literature [3-5]. This overload sensitivity occurred both with the usual nitriding depth and with increased nitriding depth (NHD).

In the proposed research project, the fatigue strength of nitrided gears is therefore to be investigated in order to increase it with knowledge of the underlying material-technical mechanisms through specific heat treatment measures.

 

Literatur

[1] Hoja, S. and A. Sitzmann, FVA-Nr. 615 III - Ermittlung und Steigerung der Tragfähigkeit von tiefnitrierten Zahnrädern. 2023, Forschungsvereinigung Antriebstechnik e.V.: Frankfurt.

[2] Sommer, M. and A. Sitzmann, FVA-Nr. 386 III - Verbindungsschichtdesign für tragfähigkeitsoptimierte Zahnflanken. 2023, Forschungsvereinigung Antriebstechnik e.V.: Frankfurt.

[3] Albertin, L., et al. Load carrying capacity of nitrided steel gears. in 94FTM4 American Gear Manufacturers Association. 1994. St. Louis.

[4] Kunst, H., P. Oster, and M. Elstorpff. Investigation of Load Carrying Capacity of NitroCarburized Gears. in 3eme Congres Mondial des Engrenages et des Transmissions.1992. Paris.

[5] Rettig, H., Nitrieren im Getriebebau - Versuchsergebnisse zur Belastbarkeit gas- und badnitrierter Stirnräder. Konstruktion, 1966. 18(3).