Analysis and Prevent Measures on 20CrMnTi Carbonitriding Abnormal Microstructures
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Key Words：20CrMnTi; Gear; Carbonitriding; Black microstructure
Abstract：Black microstructures generated in the surface of the carbonitrided gear when 20
CrMnTi steel was used. The surface hardness, contact fatigue and bending fatigue
strength of the gear were decreased significantly, which caused the failure of
the gear in the early stage and reduced its working life. In the present article
, the formation of the black microstructures was analyzed. The improvement and p
reventive measures were proposed, which played guidance for the production of ge
ars.
