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Methodology for Evaluating the Oxide Distribution in Water Atomized Steel Powder

Dimitris Chasoglou (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Proceedings of EURO PM 2009 International Powder Metallurgy Congress & Exhibition Vol. 2 (2009), p. 181-186.
[Konferensbidrag, refereegranskat]

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.

Nyckelord: alloyed sintered steels, water atomized powder, surface oxides, internal oxides, XPS analysis, HR SEM+EDX analysis



Denna post skapades 2009-11-13.
CPL Pubid: 101645

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Materialteknik
Ytbehandlingsteknik

Chalmers infrastruktur

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Surface Characteristics of Water Atomized Pre-alloyed Steel Powders and their effect on Sintering