𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Advances in alloy design aspects of cemented carbides

✍ Scribed by A Upadhyaya; D Sarathy; G Wagner

Publisher
Elsevier Science
Year
2001
Weight
493 KB
Volume
22
Category
Article
ISSN
0261-3069

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✦ Synopsis

This study describes the alloy design approaches for processing high-performance hard metals for metal cutting and mining applications. In fine-grained hardmetals for metal-cutting applications, combined addition of VC and Cr C in optimal 3 2 proportion as grain-growth inhibitors enhances both the hardness as well as indentation fracture toughness. In addition, the synergistic action of these grain-growth inhibitors also results in a more homogeneous microstructure. Consequently, the variation in the mechanical properties of these fine-grained hardmetals is reduced. This research also highlights the influence of carbon on the transverse rupture strength and toughness of the mining and fine-grained hard metals. A lower carbon in the two-phase WCq Co region of the hardmetal microstructure results in higher fracture toughness and transverse rupture strength without compromising the hardness.

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Methods to prepare needle-shaped specimens for atom probe field ion microscopy from near surface regions have been developed. The material used was a cemented carbide with a composition gradient towards the surface, but the method is equally applicable for other materials. The preparation technique