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Fatigue of sintered steels (Fe-1.5 Mo-3 Mn-0.7 C)

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Abstract

The powder metallurgy process is ideally suited to the mass production of structural parts of complicated shape and with tight tolerances without appreciable loss of material. Because of its unique attributes such as reducing weight and production cost, powder metallurgy has made very significant in roads as a substitution technology in automotive parts, such as cams and gears in this process, we can improve the mechanical properties such as fatigue resistance of PM materials by changing of manufacturing parameters, for example, density, sintering temperature, sintering time, etc. In this research, the fatigue behaviour of sintered steel (Fe-1.5 Mo-3 Mn-0.7 C) was investigated with varying of density and sintering temperature. The results showed that in this steel, increase of porosity plays an important role in the fatigue limit of specimens also with sintering at high temperature which results in more spherical pores, the fatigue strength was improved. In this research, SEM fractography was also used to determine the mechanism of fatigue fracture.

Résumé

Le processus de frittage est une parfaite méthode pour la production en série des pièces de structure compliquée avec des tolérances très limitées sans perte excessive de matières. Sa performance exceptionnelle, telle que la réduction de la masse et du coût de production, en a fait une technologie de substitution pour les pièces de véhicules comme les cames et les engrenages. Ce processus permet d'améliorer les propriétés mécaniques telles que la résistance à la fatigue des matières frittées par un changement des paramètres de production, par exemple, densité, température de frittage, durée de frittage, etc. Dans cette recherche, la conduite de fatigue des aciers frittés (Fe-1.5 Mo-3 Mn-0.7 C) est examinée par les variations de densité et de température de frittage. Le résultat a montré que dans cet acier, l'augmentation de la porosité joue un rôle essentiel dans la limite de fatigue des échantillons ainsi que dans le frittage à haute température qui cause une plus grande porosité et par ailleurs la limite de fatigue peut être améliorée. Dans cette recherche, la fractographie de microscope à balayage électronique est aussi utilisée pour déterminer le mécanisme de limite de fatigue.

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Authors and Affiliations

  1. Material Science and Engineering Department, Sharif University of Technology, Tehran, Iran

    H. Khorsand, H. Yoozbashizade & S. M. S. Reihani

  2. Materials Research Center of SAPCO, Tehran, Iran

    H. Khorsand

  3. Department of Materials science and Eng., Shiraz University, Shiraz, Iran

    S. M. Habibi & K. Janghorban

  4. Research and Development Center of SIDF Co., Tehran, Iran

    S. M. Habibi

Authors
  1. H. Khorsand
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  2. S. M. Habibi
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  3. K. Janghorban
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  4. H. Yoozbashizade
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  5. S. M. S. Reihani
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Khorsand, H., Habibi, S.M., Janghorban, K. et al. Fatigue of sintered steels (Fe-1.5 Mo-3 Mn-0.7 C). Mat. Struct. 37, 335–341 (2004). https://doi.org/10.1007/BF02481680

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  • DOI: https://doi.org/10.1007/BF02481680

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