Optimising grey iron powder compacts
Artikel i vetenskaplig tidskrift, 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.

Grey iron powder

Heat treatment

Liquid phase sintering

Mechanical properties

Microstructure

Författare

Henrik Borgström

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Walid Khraisat

Chalmers University of Technology

W Abu al Jadayil

Hashemite University

Powder Metallurgy

0032-5899 (ISSN)

Vol. 52 4 291-297

Ämneskategorier

Materialteknik

DOI

10.1179/003258908X370168