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Formation of In-Situ Dispersion Strengthening Particles in Cast FeCrAl Alloy

S. Feng ; W. Han ; H. L. Luo ; Karin Gong (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Changhai Li (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Journal of Iron and Steel Research International (1006-706X). Vol. 17 (2010), 2, p. 74-78.
[Artikel, refereegranskad vetenskaplig]

In order to fabricate dispersion strengthened alloys strengthened by submicron-sized or nano-sized stable particles through casting routes, understanding of the formation process of dispersion strengthening particles in metal melt is of significance. Thus, nano NiO and TiO2 particles were selected as reactant to form in-situ dispersion strengthening oxide particles in Fe20Cr5Al alloy. Nano NiO and TiO2 particle powder was separately dispersed into nano Ni powder first. The loose mixed nano powder was added in Fe20Cr5Al alloy melt when pouring the melt into mold. The study shows that nano NiO particles were not as effective as nano TiO2 particles in forming dispersion strengthening Al2O3 particles. The final diameters of dispersion strengthening oxide particles arose from nano TiO2 particles were of submicron. The Brownian collision of particles had caused this coarsening.

Nyckelord: in-situ particle, dispersion strengthening particle, formation, cast, FeCrAl alloy, COMPOSITES



Denna post skapades 2010-05-12. Senast ändrad 2016-11-02.
CPL Pubid: 121563

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Ämnesområden

Materialteknik

Chalmers infrastruktur