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Influence of running-in on surface characteristics of efficiency tested ground gears

Dinesh Mallipeddi (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Mats Norell (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; M. Sosa ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Tribology International (0301-679X). Vol. 115 (2017), p. 45-58.
[Artikel, refereegranskad vetenskaplig]

The effect of running-in load (0.9 or 1.7 GPa) on surface characteristics of ground spur gears, and on their development during subsequent efficiency testing (FZG rig), is examined. The effect was confined to less than 10 ism depth. Micropitting was associated with surface asperities and their plastic deformation; higher running-in load gave more micropitting, also after identical efficiency tests. Running-in increased unequal compressive residual stresses in both profile and axial directions, while after efficiency testing they approached equal levels. Deformation induced martensite is considered to form during running-in only at high load, still the amount after efficiency testing increased with running-in load. Higher surface content of phosphorous from extreme pressure additive (EP) occurred only after efficiency test following running-in at high load.

Nyckelord: Gears, Running-in, Efficiency test, Residual stresses, Micropitting, Tribofilm



Denna post skapades 2017-09-04. Senast ändrad 2017-11-22.
CPL Pubid: 251599

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Maskinteknik
Materialteknik

Chalmers infrastruktur