Optimizing Gear Performance by Alloy Modification of Carburizing Steels

Metals

Frank Hippenstiel¹  Thomas Tobie²  Hardy Mohrbacher³ 

[1] BGH Edelstahl Siegen GmbH, 57076 Siegen, Germany;FZG—Gear Research Centre, Technical University of Munich, 85748München, Germany;NiobelCon bvba, Department of Materials MTM—KU Leuven, 3001 Leuven, Belgium;

关键词: gear steel;    gear failure;    tooth root fatigue strength;    pitting resistance;    quench distortion;    microalloying;    hardenability;    toughness;    grain coarsening;   

DOI  :  10.3390/met7100415

来源: DOAJ

【 摘 要 】

Both the tooth root and tooth flank load carrying capacity are characteristic parameters that decisively influence gear size, as well as gearbox design. The principal requirements towards all modern gearboxes are to comply with the steadily-increasing power density and to simultaneously offer a high reliability of their components. With increasing gear size, the load stresses at greater material depth increase. Thus, the material and particularly the strength properties also at greater material depth gain more importance. The present paper initially gives an overview of the main failure modes of case carburized gears resulting from material fatigue. Furthermore, the underlying load and stress mechanisms, under particular contemplation of the gear size, will be discussed, as these considerations principally define the required material properties. Subsequently, the principles of newly developed, as well as modified alloy concepts for optimized gear steels with high load carrying capacity are presented. In the experimental work, the load carrying capacity of the tooth root and tooth flank was determined using a pulsator, as well as an FZG back-to-back test rig. The results demonstrate the suitability of these innovative alloy concepts.

【 授权许可】

Unknown