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

• Autorzy: Kulecki P. , Lichańska E. , Radziszewska A. , Sułkowski M.

Identyfikatory

DOI

10.1515/amm-2016-0263

• 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.

Słowa kluczowe

EN

sintered steels; alloying elements; porosity; fractography; mechanical properties

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 3
• Strony: 1613--1622
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Kulecki P.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Lichańska E.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Radziszewska A.

• AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Sułkowski M.

• 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).
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• [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).
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Uwagi

EN

The financial support of the Ministry of Science and Higher Education under AGH contract no 11.11.110.299 is acknowledged.