Methodology for Evaluating the Oxide Distribution in Water Atomized Steel Powder
Paper in proceeding, 2009

A method for characterizing the oxide composition and distribution in both the surface and the interior of water-atomized powder was developed. Pre-alloyed powder with 3wt.% Cr and 0.5 wt.% Mo was chosen as the model material. Surface sensitive analytical techniques (high resolution electron microscopy in combination with EDX-analysis, X-ray photoelectron spectroscopy and Auger electron spectroscopy) were used in order to study the type, composition, morphology and distribution of oxide products. The analysis revealed that the powder particles were mainly covered by a homogeneous (~6 nm) thick Fe-oxide layer and some spherical particulate features with size up to 200 nm that were complex Fe-Cr-Mn-Si-oxides. Using EDX Smart-Maps tool, inclusions below 1μm in size and rich in Cr and Mn were observed rarely in the interior of the powder particles. By means of the method, the distribution of surface bound and bulk oxygen is realised.

internal oxides

HR SEM+EDX analysis

water atomized powder

alloyed sintered steels

surface oxides

XPS analysis

Author

Dimitris Chasoglou

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Proceedings of EURO PM 2009 International Powder Metallurgy Congress & Exhibition

Vol. 2 181-186
9781899072071 (ISBN)

Subject Categories

Materials Engineering

Manufacturing, Surface and Joining Technology

ISBN

9781899072071

More information

Created

10/6/2017