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Sintered Steels Alloyed with Manganese: Effect of Alloying Mode

Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Eva Dudrova ; Sven Bengtsson
World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010 Vol. 3 (2010), p. 87-94.
[Konferensbidrag, refereegranskat]

Manganese has a substantial potential for the production of precision structural parts with high static and dynamic properties. However due to its peculiar properties (oxygen affinity, vapour pressure, ferrite strengthening etc.) issue of appropriate alloying mode remains open. Meticulous attention in this work was focused on the influence of alloying mode – admixing using high-purity electrolytic manganese and medium carbon ferromanganese as well as fully prealloying of water atomized powder. Various phenomena, connected with manganese evaporation and reduction/oxidation behaviour of studied materials were studied by sampling of specimens at different stages of the sintering cycle for extensive study by HR SEM+EDX, XPS, TG etc. The admixed with electrolytic manganese material shows lowest mechanical properties due to more intensive manganese sublimation and oxidation at low temperatures and further inter-granular decohesion failure. Pre-alloyed material is superior to admixed systems due to lower oxidation sensitivity, homogeneous microstructure and absence of large pores after Mn-carriers.

Nyckelord: alloyed sintered steels, manganese alloying, admixing, prealloying, thermal analysis, surface analysis, HR SEM, EDX



Denna post skapades 2010-11-15. Senast ändrad 2016-05-11.
CPL Pubid: 129109

 

Institutioner (Chalmers)

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

Ämnesområden

Funktionella material
Övrig teknisk materialvetenskap

Chalmers infrastruktur