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A comparative study of the wear behavior of deep cryogenically treated vis-à-vis conventionally treated AISI D2 steel has been made to critically examine the extent of improvement in wear resistance of tool steels by cryotreatment. A series of experiments have been done to determine dry sliding wear resistance together with examinations of the worn surfaces and generated debris, characterization of the microstructures, and measurement of the hardness values of the differently heat treated steels. The obtained results unambiguously assist to infer that cryotreatment substantially improves wear resistance of D2 steel, but the extent of improvement is a strong function of the test load. These observations have been explained with appropriate identification of the operative wear mechanisms at different test conditions. Microstructural characterizations reveal that the improvement in hardness and wear resistance by cryotreatment is due to near complete removal of soft retained austenite with concurrent increase in the amount of secondary carbides and tempered martensite.

ENHANCEMENT OF WEAR RESISTANCE OF DIE STEEL BY DEEP CRYOGENIC TREATMENT