Metallurgical and mechanical characteristics of cryogenically treated tungsten carbide (WC-Co)

This paper aims to present the metallurgical and mechanical characterization of cryogenically treated tungsten carbide (WC-Co) in terms of alpha-, beta-, gamma-, and eta-phase particles and wear behavior, respectively. The specimens of commercially available uncoated WC-Co in the form of round turning inserts were procured and subjected to cryogenic treatment at two levels -110A degrees C (shallow treatment) and -196A degrees C (deep treatment) of temperature. The microstructures obtained after cryogenic treatments have been characterized with a prominence to comprehend the influence of cryogenic treatment on the nature, size, and distribution of alpha-, beta-, gamma-, and eta-phase particles as compared to untreated specimen. The mechanical properties such as hardness and wear rate of the specimens have also been compared by performing Rockwell A hardness test and pin-on-disk wear test, respectively. Microstructures, hardness, wear rate, and analysis of worn surface divulge the underlying metallurgical mechanism responsible in improving mechanical properties of the WC-Co.