Sintering of bimodal micrometre/nanometre iron powder compacts - A master sintering curve approach
Journal article, 2021

Though press and sinter powder metallurgy (PM) steel offers cost-effective solutions for structural applications, there is a constant drive for improvement in their density. Addition of nanopowder to the conventional micrometre-sized metal powder is explored to improve the sinter density. In this study, the effect of nanopowder addition in varying amounts has been studied. Carbonyl iron powder (<5 μm) and water atomized iron powder (<45 μm) were used as the base powder to which varying amounts of iron nanopowder (<100 nm) was added. Dilatometric sintering studies under pure hydrogen atmosphere were carried out to analyze the densification behavior. The results revealed that the bimodal powder mixture containing 25% nanopowder exhibited the highest green density for both carbonyl and ASC 300 compacts. Master sinter curve for compacts was developed based on the dilatometer data. The apparent activation energy for sintering decreased with an increase in nanopowder content. This is reflected in the values of work of sintering.

NanopowderWater atomized ferrous powderCompactionSinteringDilatometerMaster sintering curve

Author

Swathi Kiranmayee Manchili

Chalmers, Industrial and Materials Science, Materials and manufacture

Johan Wendel

Chalmers, Industrial and Materials Science, Materials and manufacture

Eduard Hryha

Chalmers, Industrial and Materials Science, Materials and manufacture

Lars Nyborg

Chalmers, Industrial and Materials Science, Materials and manufacture

Powder Technology

0032-5910 (ISSN)

Vol. 391 557-568

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Nano Technology

Areas of Advance

Production

Roots

Basic sciences

DOI

10.1016/j.powtec.2021.06.052

More information

Latest update

7/22/2021