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Surface characterisation of fine inert gas and water atomised stainless steel 316L powders: formation of thermodynamically unstable surface oxide phases

Y Hedberg ; Mats Norell (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; J Hedberg ; P Szakálos ; P Linhardt ; I Odnevall-Wallinder
Powder Metallurgy (0032-5899). Vol. 56 (2013), 2, p. 158-163.
[Artikel, refereegranskad vetenskaplig]

New insights are presented on the speciation of surface oxide phases on fine inert gas atomised (GA, ,45 and ,4 mm) and water atomised (WA, ,45 mm) stainless steel AISI 316L powders. Xray photoelectron and Auger electron spectroscopy, scanning electron microscopy, Raman spectroscopy, and cyclic voltammetry were applied for the characterisation. Oxidised manganese was strongly enriched in the outermost surface oxide of the GA powders (13 and 47 wt-%), an effect increasing with reduced particle size. Manganese and sulphur were enriched in oxide nanoparticles on the surface. Oxidised silicon (59 wt-%) was enriched on the WA powder surface. Tri- or tetravalent manganese oxides were observed on the GA particles in addition to a- Fe2O3, and Cr2O3. The oxide of the WA powder revealed in addition the likely presence of a silicate rich phase, mainly consisting of tetravalent Si, di- and/or trivalent Fe, and hexavalent Cr, which was confirmed not present as chromate.

Nyckelord: Stainless steel, Powder, Gas atomisation, Water atomisation, Surface characterisation, Oxide



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Denna post skapades 2013-05-20. Senast ändrad 2016-07-18.
CPL Pubid: 177120

 

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