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Oxide Distribution in Prealloyed 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)
World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010 Vol. 1 (2010), p. 61-69.
[Konferensbidrag, refereegranskat]

A method for evaluation of the oxygen 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 chemical composition with regard to composition, morphology, size and distribution of surface oxides was studied by means of surface analytical techniques (XPS, Auger, SEM and EDX). The analysis revealed that the powder particles are 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, surface coverage of which is <10%. About 45% of total oxygen content is in the form of easily-reducible iron oxide layer. Remaining oxygen is linked to the surface stable oxides and internal complex oxides. Study of the internal oxides using EDX Smart-Maps tool reveals presence of inclusions below 1μm in size and rich in Cr and Mn.

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



Denna post skapades 2010-10-27. Senast ändrad 2016-05-11.
CPL Pubid: 128184