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New alloying systems for PM-steels: opportunities for the Mn-Si master alloys

Raquel de Oro Calderon (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Monica Campos ; Jose M. Torralba
International Powder Metallurgy Congress and Exhibition, Euro PM 2013; Gothenburg; Sweden; 15 September 2013 through 18 September 2013 (2013)
[Konferensbidrag, refereegranskat]

Low alloyed steels containing innovative combinations of alloying elements have been produced though the master alloy route. Fe-Mn-Si master alloy systems were designed to enhance sintering by creating a liquid phase, and were manufactured by gas atomizing in N2. This paper presents an overview of the characteristics of steels modified with Fe-Mn-Si master alloys. Special focus is given to defining the proper conditions for sintering, and to analyzing the level of mechanical properties achievable with standard processing conditions. Although high temperatures (>1300 ºC) are required for reducing highly stable Mn-Si oxides, standard sintering cycles at 1120 and 1250 ºC yielded oxygen contents below 0.1 wt.% and 0.02 wt.% respectively, combined with competitive mechanical properties in the as sintered condition. UTS values around 600 MPa, elongations between 1-3%, hardness values of 200-350 HV10 and impact energies around 10-30 J can be obtain with less than 3 wt.% of alloying elements. Besides, a proper balance of swelling upon liquid phase formation and isothermal shrinkage provides dimensional changes below 0.1 %

Nyckelord: Mn-Si master alloys, oxidation-sensitive elements, mechanical properties, sintering conditions


Invited Speaker



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Denna post skapades 2013-12-03. Senast ändrad 2015-05-06.
CPL Pubid: 188230