Optimising grey iron powder compacts
Journal article, 2009

The grey iron microstructure Fe–2C–2Si powder based compact is tailored by different kinds of in situ and post sintering processing. This has been achieved by combining thermodynamic and kinetics modelling of microstructure development with sintering and controlled heat treatment experiments of tensile test specimens die compacted at 600 MPa. Applying optimised sintering conditions led to a grey iron like microstructure with 95% relative sintered density. Sinter hardening the compacts led to 500 MPa in yield strength and 600 MPa in ultimate tensile strength in combination with ductile fracture. Quenched and tempered condition showed the same strength values, but combined with brittle fracture due to martensitic structure. Pore rounding and partial pore filling by graphite were obtained by austenising isothermal hold during the cooling of the sintering cycle.

Liquid phase sintering

Heat treatment

Microstructure

Grey iron powder

Mechanical properties

Author

Henrik Borgström

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Walid Khraisat

Chalmers

W Abu al Jadayil

Hashemite University

Powder Metallurgy

0032-5899 (ISSN)

Vol. 52 4 291-297

Subject Categories

Materials Engineering

DOI

10.1179/003258908X370168

More information

Latest update

9/10/2018