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Carbon, porosity and fatigue in sintered steel

Khorsand, H ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. DOI: 10.1016/S0026-0657(02)80104-7
  3. Publisher: 2002
  4. Abstract:
  5. PM steel parts have become more widely used in recent years by reason of materials and cost savings. This paper deals with the mechanical properties of PM parts made of ULTRAPAC-LA (Fe-0.5Mo-1.5Cu-1.75Ni) with 0.2 and 0.5% graphite addition. ULTRAPAC-LA having the same chemical composition as Distaloy AB was investigated. Specimens with dimensions of 89×6×5.5 mm3 were prepared. The green compacts were sintered at 1120°C in a 75 H2-25 N2 atmosphere for 40 minutes to densities in the range of 6.7g/cm3 to 7g/cm3. They were tested in static and cyclic loading, and their microstructures were studied by optical microscope. The results show that porosity has a definite effect on fatigue resistance of this alloy. The formation of bainite and martensite by raising carbon content allied to heat treatment increased tensile strength, fatigue strength and apparent hardness, while a higher green density maintained satisfactory ductility. It was possible to achieve ultimate tensile, yield and fatigue strength as high as 882, 710 and 188 MPa respectively with apparent hardness of 286 HV
  6. Keywords:
  8. Source: Metal Powder Report ; Volume 57, Issue 4 , 2002 , Pages 32-36 ; 00260657 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0026065702801047