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Vacuum Sintering Studies On Chromium Alloyed PM Steels

Maheswaran Vattur Sundaram (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Seshendra Karamchedu (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Clément Gouhier ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Proceedings of Wolrd PM2016 - Steel Sintering (2016)
[Konferensbidrag, refereegranskat]

Recent advancements in vacuum furnace technologies have led to an increased interest in vacuum sintering of Powder Metallurgy (PM) steel components owing to the robustness, productivity and the possibility to integrate heat-treatment into the process at an attractive cost. In the present study the potential for vacuum sintering of chromium-alloyed PM steels and the effect of the vacuum level on the final properties of the components is evaluated. The studies were performed on Fe-1.8 wt.% Cr powder and the sintering experiments were performed in a dilatometer. Four different vacuum levels: 1, 10, 10-2 and 10-4 mbar were studied and the effect of density and carbon content were also examined. The results indicate an efficient oxide reduction and process robustness at intermediate vacuum levels whereas high-temperature sintering in high vacuum brings risk of Cr-sublimation. Still, applying proper conditions, vacuum sintering proved to be an attractive alternative to process Cr-alloyed steel powders. The influence of vacuum level on the sintering efficiency of chromium-alloyed PM steels is studied.

Nyckelord: vacuum sintering, PM steels, oxide reduction, sublimation during sintering



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Denna post skapades 2016-10-14. Senast ändrad 2016-12-20.
CPL Pubid: 243379

 

Institutioner (Chalmers)

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

Ämnesområden

Materialvetenskap
Produktion
Hållbar utveckling
Materialteknik
Metallurgisk produktionsteknik

Chalmers infrastruktur