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Tytuł artykułu

Fractography and Porosity Analysis of Cr and Cr-Mo PM Steels

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Języki publikacji
EN
Abstrakty
EN
The aim of the study was to evaluate the effect of processing variables on the porosity and fractography of Cr and Cr-Mo PM steels. The measurements were performed on sintered steels made from commercial Höganäs pre-alloyed powders: Astaloy CrA, Astaloy CrL and Astaloy CrM with two different carbon concentrations (0.2% and 0.6%) added in the form of ultra fine graphite powder grade C-UF. Following mixing in Turbula mixer for 30 minutes, green compacts were single-action pressed at 660 MPa according to PN-EN ISO 2740 standard. Sintering was carried out in a laboratory horizontal tube furnace at 1120°C and 1250°C for 60 minutes, in an atmosphere containing 5%H2 and 95%N2. After sintering, the samples were tempered at 200°C for 60 minutes in air. For porosity evaluation computer software was employed. Hitachi S-3500M SEM equipped with EDS (made by Noran) was employed for fracture analysis. The steel based on Astaloy CrM pre-alloyed powder is characterized by fine pores and good mechanical properties. When sintered at 1250°C, it had area of pores approx. 7.12 μm2, ultimate tensile strength (UTS) about 679 MPa and elongation about 4%. The steels were characterized by ductile/cleavage and ductile fractures.
Twórcy
autor
  • AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland
  • AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland
  • AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland
  • AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland
Bibliografia
  • [1] R. M. German: Powder metallurgy science, second edition, MPIF, Princeton (1994).
  • [2] W. Missol: Spiekane Części Maszyn, Wydawnictwo „Śląsk”, Katowice (1976).
  • [3] T. Pieczonka, M. Sułowski, A. Ciaś, Archives of Metallurgy and Materials, 57, (4), 1001-1009 (2012).
  • [4] M. Sułowski, A. Ciaś, Archives of Metallurgy and Materials, 54, (4), SI, 1093-1102 (2009).
  • [5] M. Sułowski, Archives of Metallurgy and Materials, 53, (2), 124-140 (2010).
  • [6] Ch. Fiał, E. Dudrova, M. Kabatova, M. Kupkova, M. Selecka, M. Sułowski, A. Ciaś, Powder Metallurgy Progress, 15, SI, 124-129 (2015).
  • [7] J. Lis, SU 1566, AGH Uczelniane Wydawnictwa Naukowo-Dydaktyczne, Kraków (2000).
  • [8] M. Blicharski, Odkształcanie i pękanie, Wydaw. AGH, Kraków (2002).
  • [9] K. Przybyłowicz, Strukturalne aspekty odkształcania metali, WNT, Warszawa (2002).
  • [10] J. W. Wyrzykowski, E. Pleszakow, J. Sieniawski, Odkształcanie i pękanie metali, WNT, Warszawa (1999).
  • [11] E. Dudrova, M. Kabatova, Workshop Fractography of Sintered Materials – Principles and Application, IMR SAS Kosice (2015).
  • [12] P. Kulecki, M. Sułowski, M. Ciesielka, Rudy i Metale Nieżelazne, 5, (58), 266-272 (2013).
  • [13] M. Sułowski, Rudy i Metale Nieżelazne 10, (52), 627–645 (2008).
Uwagi
EN
The financial support of the Ministry of Science and Higher Education under AGH contract no 11.11.110.299 is acknowledged.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-d0d54202-1a1a-42a6-9104-cafb57b61c1e
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