A study of the microstructure and wear of high speed steels

El-Rakayby, AM

Abstract

The present work describes the successful extraction of
the secondary hardening carbides of high speed steels, which
allowed the identification of these carbides by crystalloqraphic,
and microanalysis techniques. The secondary hardening
carbide of high speed steels was found to be the-cubic M2C
carbide and not the MC carbide as previously claimed. The
secondary kic carbide was found to precipitate in the
over-tempered state well beyond peak hardness. The sequence of
secondary carbide precipitation has been determined. The
relation between wear resistance and hardness of high speed
steels has been found to be non-linear due to microstructural
changes at and beyond peak hardness. However, primary carbides
of the MC and M6C types of carbides were found to be stable
during tempering, of these steels. It has been shown that the
primary carbides did not contribute to the wear resistance of
steels tempered to peak hardness. -However, the primary
carbides were found to contribute to the wear rate of
over-tempered steels due to their abrasive role.

Citation

El-Rakayby, A. A study of the microstructure and wear of high speed steels. (Thesis). University of Salford

• Thesis Type: Thesis
• Deposit Date: Aug 16, 2011
• Publicly Available Date: Aug 16, 2011
• Award Date: Jan 1, 1986