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Abstract
The heat-treatment and properties of some ferrous sintered alloys are investigated. The approach has been to introduce nitrogen to enhance the heat-treatment response during the heat-treatment cycle. The process is known as γ-nitriding to distinguish it from the ferritic nitriding process which is a surface-hardening treatment. Addition of H2S to the γ-nitriding atmosphere may be used to improve machinability. It is suggested that the economics of the process may be favourable enough for the process to be commercially viable.