Sintered Steels Alloyed with Manganese: Effect of Alloying Mode
Paper in proceedings, 2010

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.

EDX

HR SEM

admixing

manganese alloying

thermal analysis

alloyed sintered steels

prealloying

surface analysis

Author

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Eva Dudrova

Institute of Materials Research Slovak Academy of Sciences

Sven Bengtsson

Höganäs

World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010

Vol. 3 87-94

Subject Categories

Other Materials Engineering

ISBN

9781899072125