EFFICIENCY OF DIFFERENT CARBON SOURCES DURING SINTERING OF CR-PREALLOYED PM STEELS: GRAPHENE, GRAPHITE OR CARBON BLACK?
Paper in proceedings, 2014

Prerequisite for development of inter-particle necks as well as carbon dissolution in the steel matrix is efficient removal of the iron oxide layer, covering surface of the base steel powder. Reactivity of admixed carbon source strongly affects efficiency of the surface oxide removal and so determines inter-particle necks development, further carbon dissolution and connected to this microstructure development. The present study is focused on the critical evaluation of the parameters, determining chemical reactivity of different carbon sources. Effect of admixing of number of different carbon sources – graphene nanoplatelets, synthetic and natural graphite grades with different particle size as well as carbon black powders – on the sintering behaviour of Cr-prealloyed powder was evaluated. Deoxidation, microstructure and inter-particle necks development were studied by means of metallography and fractography. Carbon source structure, powder size and interatomic bond characteristics were established to be the most important properties determining carbon reactivity.

carbon source

Cr-alloyed PM steels

oxide reduction

carbothermal reduction

Author

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Sigurd Berg

Hilmar Vidarsson

Advances in Powder Metallurgy & Particulate Materials-2014

Vol. 5 16-28

Driving Forces

Sustainable development

Areas of Advance

Production

Subject Categories

Other Materials Engineering

Metallurgy and Metallic Materials

ISBN

978-0-9853397-6-0

More information

Created

10/7/2017