摘要
It has been studied connection between composition, structure and properties of powder steels using technology of their own. Nitrogen containing powders were obtained by mechanical allowing (MA) of Fe-Cr and Fe Cr Ni-C mixtures in a high-energy planetary mill in the gaseous nitrogen environment. The contents of nitrogen after MA was 0.7% in Fe-Cr-N and 2.1% in Fe-Cr-Ni-C-N mixes. Phase composition after the mechanical alloying was: in system Fe-Cr-N - solid solution of chrome in iron and α - Fe, in system Fe-Cr-Ni-C-N-40% γ-phase (vol. fraction) , α - Fe and solid solution Cr-Fe. There are investigated physical-mechanical, tribo-technical and specify properties of the nitrous steels, are fixed the base dependences between parameters of process of MA and structure of steels. Introduction of nitrogen by rather new method of MA, as against saturation of melts, allows to run phase composition - to generate structure with more dispersible and uniform nitrides or with the nitrous austenite (depending on purpose of steel).It is demonstrated by means of X-ray diffraction and method of Raman spectrum analysis, that in a sintering process of powder steels, obtained by introduction of carbon in the form of cast-iron powder, a formation of metallofullerite phase Fe_ x C_ 60 at determined conditions. The possibility of fullerenes conception in powder carbon steels, diffusion of iron atoms at fullerite lattice and formation of metallofullerites during contact interaction of fullerene with iron is confirmed experimentally.Dependence of synthesis activity of fullerences from temperature of sintering, type and quantity of alloy elements is determined.
It has been studied connection between composition, structure and properties of powder steels using technology of their own. Nitrogen containing powders were obtained by mechanical allowing （MA） of Fe-Cr and Fe Cr Ni-C mixtures in a high-energy planetary mill in the gaseous nitrogen environment. The contents of nitrogen after MA was 0.7% in Fe-Cr-N and 2. 1% in Fe-Cr-Ni-C-N mixes. Phase composition after the mechanical alloying was： in system Fe-Cr-N - solid solution of chrome in iron and α- Fe, in system Fe-Cr-Ni- C-N-40% γ-phase （vol. fraction） , α- Fe and solid solution Cr-Fe.
There are investigated physical-mechanical, tribo-technical and specify properties of the nitrous steels, are fixed the base dependences between parameters of process of MA and structure of steels. Introduction of nitrogen by rather new method of MA, as against saturation of melts, allows to run phase composition - to generate structure with more dispersible and uniform nitrides or with the nitrous austenite （depending on purpose of steel）.
It is demonstrated by means of X-ray diffraction and method of Raman spectrum analysis, that in a sintering process of powder steels, obtained by introduction of carbon in the form of cast-iron powder, a formation of metallofullerite phase FexC60 at determined conditions. The possibility of fullerenes conception in powder carbon steels, diffusion of iron atoms at fullerite lattice and formation of metallofullerites during contact interaction of fullerene with iron is confirmed experimentally.
Dependence of synthesis activity of fullerences from temperature of sintering, type and quantity of alloy elements is determined.
出处
《广东有色金属学报》
2005年第2期201-204,共4页
Journal of Guangdong Non-Ferrous Metals
