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Abstract
This work has focused on the effect of the Deep Cryogenic Treatment on the wear behaviour, micro structuralchange, retained austenite percentage and hardness of EN31 alloy steel. The analysis are conducted using the scanning microscope to get the microstructure change, a pin on disk wear testing machine to analyse the wear behaviour, as well as hardness testing machine to compare the hardness change. It was shown that the deep cryogenic treatment eliminated the retain austenite and made a more uniform carbide distribution with higher percentage. It was also observed that the deep cryogenic treatment improved the wear resistance and hardness of the substance. Moreover, the hardness and wear resistance decreased in longer austenitization duration due to the grain growth and the dissolution of carbides in the structure. There are many types of heat treatment we are using hardening heat treatment method which means heat to a definite temperature and cooling or quenching. After this process tempering is done to lower the brittleness and increase in ductility.