The Study of Local Effect of Manganese on Microstructure Development of Admixed Fe-Mn-C Sintered Steels

High Temperature Materials and Processes

Hryha Eduard¹  Bidulská Jana²  Bidulský Róbert² 

[1] Department of Materials and Manufacturing Technology, Chalmers University of Technology, Ränvagen 2A, SE – 412 96 Göteborg, Sweden;Department of Metallurgy, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia;

关键词: sintered steels;    microstructure;    digm;    diffusion coefficient;    81.05.bx;    81.20.ev;    81.40.-z;   

DOI  :  10.1515/htmp-2015-0107

来源: DOAJ

【 摘 要 】

The present paper is focused on the effect of manganese on microstructure development of admixed Fe-Mn-C sintered steels along with diffusion characteristics of manganese in the iron matrix. Admixed systems were prepared on the base of sponge iron powder, with addition of 0.3% C and 3% Mn added as ferromanganese. Sintering at 1,023, 1,173, 1,323, 1,423 and 1,473 K for 180 s was carried out in laboratory tube furnace in an atmosphere of pure gases mixture 25% N2+75% H2 with the dew point of 243 K. The results show that admixed sintered manganese steels exhibit heterogeneity of microstructure due to the local chemical heterogeneities of these materials, in particular for those areas with a high manganese concentration. On the basis of calculation of manganese apparent diffusion coefficient and penetration depth, results reveal that diffusion-induced grain boundary migration (DIGM) is the dominant alloying mechanism in sintered manganese steels.

【 授权许可】

Unknown