Effect of Running-In (Load and Speed) on Surface Characteristics of Honed Gears
Journal article, 2019

The initial running-in cycles alter the surface integrity characteristics and influence gear performance. This article shows how the surface characteristics of honed spur gears evolved due to the combined effect of running-in load (0.9 or 1.7 GPa) and speed (0.5 or 8.3 m/s) in Forschungsstelle fur Zahnräder und Getriebebau tests. Running-in affected the surface layers to a depth of 5 µm. High running-in load promoted plastic deformation of asperities, created microstructural changes associated with surface cracks, and relaxed residual stresses. It also enhanced the amount of phosphorous from extreme pressure (EP) additives at the surface. The surface contact fatigue failure—that is, micropitting—was promoted by running-in speed rather than load.


honed spur gears

surface integrity characteristics


Dinesh Mallipeddi

Chalmers, Industrial and Materials Science

Mats Norell

Chalmers, Industrial and Materials Science, Materials and manufacture

M. Sosa

Royal Institute of Technology (KTH)

Lars Nyborg

Chalmers, Industrial and Materials Science

Tribology Transactions

1040-2004 (ISSN)

Vol. 62 3 412-418

Subject Categories


Manufacturing, Surface and Joining Technology

Other Materials Engineering



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