Table 4: Contact fatigue life of gears under different contact stress levels.

Contact stress σ/MPaContact fatigue life ×105
Nitreded and TiN coated 32Cr2MoVNitrided 32Cr2MoV

25001.451.749.561.511.171.231.341.011.311.06
22004.944.665.445.184.653.883.313.973.923.10
200013.8511.4616.0115.7214.226.925.777.517.237.04
180049.7553.8550.7247.8643.7519.9122.6321.7317.8616.40