A New Method for Evaluating the Indentation Toughness of Hardmetals

A New Method for Evaluating the Indentation Toughness of Hardmetals

Blog Article

This paper proposes a new method of evaluating the indentation toughness of hardmetals using the length of Palmqvist cracks (C) and Vickers indentation diagonal size (di).Indentation load “P” is divided into two parts: Pi for plastic indentation size and Pc for Palmqvist cracks.Pi depends upon the square of the indentation size (di2) and Pc depends upon (C3/2).The new method produces a very good linear relationship between the calculated indentation toughness values and the standard Pine Bark conventional linear elastic fracture mechanics toughness values with the Girls Fall Top same cemented carbide materials for a large number of standard Kennametal grades for both straight WC-Co carbide grades and grades containing cubic carbides.The new method also works on WC-Co hardmetal data selected from recently published literature.

The technique compares the indentation toughness values of WC-Co materials before and after vacuum annealing at high temperature.The indentation toughness values of annealed carbide samples were lower than for un-annealed WC-Co hardmetals.