The requirements for the quality of deep-carburized case in large heavy-duty gears are introduced in terms of the gear's loading and failing characteristics. Having considered the carbon transfer and diffusion as well as the mechanism of carbides formation and growth during the carburizing process,various factors influencing the quality of carburized case are analysed. The methods as how to control the surface carbon concentration,carbon profiles and the morphology of carbides have been put forward.
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