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Processing and Ductile-Brittle Transitions in PM Manganese Steels

By A. Cias and Stephen C. Mitchell


YesBrittleness in manganese steels can be associated with processing in a "wet¿\ud [micro]climate resulting in the formation of continuous oxide networks. The formation of\ud these networks can be prevented by sintering in an atmosphere, also ¿local¿ in a semiclosed\ud container, adhering to the Ellingham-Richardson oxide reduction criteria. When\ud this requirement is satisfied, however, further types of ductile ¿ brittle transitions are\ud observed. Rapid cooling, typically above 40°C/min, produces enough martensite to render\ud Fe-(3-4)Mn-(0·6-0·7)C material macroscopically brittle. Quenched and conventionally\ud tempered structures remain brittle. It is tentatively suggested that segregation of minor\ud alloying/tramp element(s), as in cast materials, is responsible for this temper\ud embrittlement. To overcome it, heat treatment at a temperature no higher than 200°C,\ud recovery/stress relief, is recommended

Topics: PM Processing, Temper Embrittlement, Manganese Steels, Tramp Element, Heat Treatment, Ductility, Oxygen Segregation
Year: 2005
OAI identifier:
Provided by: Bradford Scholars

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