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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2013

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The comparison of computer methods for porosity evaluation in sintered constructional steels

Dobrzański L.A., Musztyfaga-Staszuk M., Łuckoś A.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 61, nr 2

395--402

Purpose: Purpose of this paper is to compare the results obtained from the parameters characterizing the porosity using two computer programs. Design/methodology/approach: The powders used in the present paper are pre-alloyed iron-base powders. The amount of graphite which is mixed with the iron-base powder is 0.6% and lubricant is 0.75%. Green compacts were sintered in a vacuum furnace and cooled in nitrogen at three different rates: 6.5ºC/s, 1.6ºC/s and 0.3ºC/s. Next the samples were tempered in vacuum in the same furnace and cooled in nitrogen, with the exception of low cooling. Obtained samples were examined by light optical microscopy (LOM) for microstructure observation and scanning electron microscopy (SEM). Findings: Investigation of porosity in the pre-alloyed steels was performed using ”Image-Pro Plus” computer program of Media Cybernetics company and “Sigma Scan” computer program of Systat Software company. Leica light microscope (MEFA4) was used to prepare series of micrographs. The microstructures were observed at 25x magnification and recorded as *.jpg files. After calibration of the digital images, the chosen parameters were calculated. Practical implications: Both programs have some limitations, which made it difficult to obtain some results automatically. Originality/value: The obtained results from the programs confirm that these programs are very useful in the statistical analysis of microstructures of sintered materials, because of the time savings during calculations.