17CrNiMo6 pulverizer reducer gear shaft breakage cause analysis

Abstract

Abstract:

17CrNiMo6 is normal steel for bearings. There was an accident that a thermal power plant’s pulverizer reducer gear shaft, made from 17CrNiMo6, was broken. After macroscopic analysis, chemical element analysis metallographic structure analysis and mechanical property test, it was found that mechanical properties are not evenly distributed on the shaft outside surface carburized layer. Partial area is lower than standard required value. Breakage appears like impact fatigue caused. This equipment worked in high load condition for long period. Impact in startup caused crack and expended to shaft core, ultimately caused shaft broken.

Key words:

17CrNiMo6, shaft, impact, breakage, carburized layer, high load

WANG Xi.

17CrNiMo6 pulverizer reducer gear shaft breakage cause analysis

[J]. Huadian Technology, 2017, 39(10): 58-59.

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17CrNiMo6 pulverizer reducer gear shaft breakage cause analysis

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