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Microstructure of massive iron-carbon alloys obtained by mechanical alloying and sintering

Nowosielski R., Pilarczyk W.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 4

246-253

Purpose: The ultimate aim of this work was to investigate structure and properties massive Fe-6.67%mass.C and Fe-0.4%mass.C materials obtained by mechanical alloying and sintering. Design/methodology/approach: The powders of the iron-carbon alloys obtained by mechanical alloying method and after that the powders were sintering. The sintering process was conducted by using the impulseplasma method. In this article the usability of mechanical alloying method and sintering to produce the massive Fe-C materials were presented. The morphology of voids of iron-carbon sinters was analyzed using the scanning electron microscopy method. The distribution of powder particles was determined by a laser particle analyzer. The observation of the shape and size of the grains was carried out by means of the LEICA optical microscope. Then one performed the measurements of the hardness with the Vickers method. The density of the sinters was measured using the Multivolume Pycnometer 1305. Findings: The laboratory tests show that, by using the mechanical alloying method, one can produce powder of Fe-6.67%mass.C and Fe-0.4%mass.C alloys with intentional chemical constitution and desirable structure. The structure of the alloyed materials is homogeneous and fine-grained and inside the materials didn't find some impurities and undesirable phases. The sintering by using the impulse-plasma method makes the sinters with close to theoretical density with non-variable nanocrystaline structure possible. The hardness of the sinters were 1300 HV and 250 HV adequately. Research limitations/implications: Property of Fe-C alloys correction is possible by refinement of grains and modification of phases composition. Nanocrystaline size of grain is advisable to make it in correct technology of producing bulk materials with nanocrystaline structure. All of the presented experiments in this article are made on a laboratory scale. At the present time, most often, the mechanical alloying and the sintering processes of nanocrystaline materials are only just in the laboratory scientific research. In the nearest future the producing of amorphous and nanocrystaline materials will take place not only in the laboratory scale and move to the industry. Originality/value: The powders produced by using mechanical alloying techniques can be use to produce bulk materials with desirable mechanical, physical and chemical properties.