Mechanical Properties and Microstructure of PM Mn-Cr-Mo Steels With Low Carbon Concentration

• Autorzy: Lichańska E. , Sułkowski A. , Ciaś A.

Identyfikatory

DOI

10.1515/amm-2016-0021

• Języki publikacji: EN

Abstrakty

EN

The effect of chemical composition of the sintering atmosphere on the microstructure and mechanical properties of PM structural low-carbon steels is presented. The base powders were Astaloy CrL, Astaloy CrM, low carbon ferromanganese and graphite C-UF. From the base powders two mixtures with compositions of Fe-3%Mn-(1.5/3%)Cr-(0.2/0.5)%Mo-0.2%C were prepared. Following pressing in a steel rigid die, compacts were sintered at 1250°C for 60 min in a semi-closed container. 5%H₂-95%N₂ mixture and air were the sintering atmospheres. For sintering in air, lumps of ferromanganese were placed with the compacts in the container. After sintering, half of the samples were tempered at 200°C for 60 minutes in air. Mechanical tests (tensile, bend, toughness, hardness) and microstructural investigations were performed. The microstructures of the steels were inhomogeneous, mainly ferritic-bainic. Tempering of steel based on Astaloy CrM sintered in an atmosphere of 5% H₂-95% N₂ slightly reduced tensile strength and toughness: from 748 to 734 MPa and from 7.15 to 6.83 J/cm², respectively. Chemical composition had a greater effect; steels based on Astaloy CrL and Astaloy CrM had tensile strengths 526-665 and 672-748 MPa, hardness 280-325 and 388-421 HV, respectively. The best properties were obtained after sintering in air of Fe-3%Mn-3%Cr-0.5%Mo-0.2%C without heat treatment: tensile strength 672 MPa, toughness 6.93 J/cm², hardness 421.1 HV, 0.2 % offset yield strength 395 MPa.

Słowa kluczowe

EN

PM steels; microstructure; 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. 1
• Strony: 109--114
• Opis fizyczny: Bibliogr. 21 poz., rys., tab., wykr.

Twórcy

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

Sułkowski A.

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

autor

Ciaś A.

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

Bibliografia

• [1] Council Directive 90/394/EEC of 28 June 1990 on the protection of workers from the risks related to exposure to carcinogens at work.
• [2] Commission Directive 91/322/EEC of 29 May 1991 on establishing indicative limit values by implementing Council Directive.
• [3] M. Sułowski, Wpływ parametrów wytwarzania na własności i strukturę spiekanych stali manganowych. AGH, Kraków, 1997 [Master thesis].
• [4] M. Sułowski, Sintered PM manganese steel, Archives of Metallurgy and Materials 2, 51, 227-236 (2006).
• [5] P. Gac, M. Sułowski, M. Ciesielka, Własności mechaniczne i mikrostruktura spiekanych stali o zawartości 3% Mn, 3% Cr i 0,5% Mo obrabianych cieplnie, Rudy Metale Nieżelazne 57, 10, 712-717 (2012).
• [6] S. Cygan, M. Sułowski, M. Ciesielka, Własności mechaniczne i mikrostruktura spiekanych stali konstrukcyjnych obrabianych cieplnie, Rudy i Metale Nieżelazne 57, 9, 609-614 (2012).
• [7] M. Sułowski, M. Kabátová, E. Dudrová, The effect of sintering atmosphere on the microstructure, properties and fracture behaviour of Cr-Mn low-alloyed sintered steel, p. 47. Fractography 2012 International Conference, book of abstract.
• [8] M. Sułowski, P. Matusiewicz, Comparison of mechanical properties of Mn-Cr-Mo steels sintered in different conditions, Solid State Phenomena 197, 33-40 (2013).
• [9] M. Sułowski, M. Kabátová, E. Dudrová, Microstructure and properties of Cr-Mn alloyed sintered steel, Powder Metallurgy Progress 12, 2, 71-83 (2012).
• [10] K. Przybyłowicz, Metaloznawstwo, Wydawnictwa Naukowo- Techniczne, Warszawa, 1992- 1999.
• [11] E. Lichańska, M. Sułowski, M. Ciesielka, Własności spiekanych stali Mn-Cr-Mo o niskiej zawartości węgla, Rudy i Metale Nieżelazne 58, 9, 514-520 ( 2013).
• [12] P. Kulecki, M. Sułowski, M. Ciesielka, Mikrostruktura i własności mechaniczne spiekanych stali chromowych i chromowo-molibdenowych, Rudy i Metale Nieżelazne 58, 6, 324-332 (2013).
• [13] Thermocalc 3.0 version: http://www.thermocalc.se
• [14] M. Blicharski, Inżynieria Materiałowa - Stal, Wydawnictwa Naukowo-Techniczne, Warszawa, 2004.
• [15] M. Sułowski, P. Kulecki, A. Radziszewska, Sintered structural PM Cr and Cr-Mo steels, Archives of Metallurgy and Materials 59, 4, 1507-1512 (2014).
• [16] M. Sułowski, The effects of processing parameters on the structure and mechanical properties of structural PM steels containing Mn, Cr and Mo, Archives of Metallurgy and Materials 59, 4, 1499-1505 (2014).
• [17] M. Sułowski, A. Ciaś, T. Pieczonka, The Microstructure and properties of low-carbon PM Mn-Cr-Mo steels sintered under different conditions, Archives of Metallurgy and Materials 59, 2, 575-580 (2014).
• [18] T. Pieczonka, M. Sułowski, A. Ciaś, Atmosphere effect on sintering behaviour of Astaloy CrM and Astaloy CrL Höganäs powders with manganese and carbon additions, Archives of Metallurgy and Materials 57, 4, 1001-1009 (2012).
• [19] M. Sułowski, A. Ciaś, Microstructure and mechanical properties of Cr-Mn structural PM steels, Archives of Metallurgy and Materials 56, 2, 294-303 (2011).
• [20] M. Sułowski, Dilatometric investigations of Fe-Mn-Cr- Mo PM steels with different carbon concentrations, Powder Metallurgy Progress 8, 2, 151 (2008).
• [21] Höganäs handbook for sintered components, part 6 - Metallography, Höganäs AB - http://hoganas.com/Documents/Handbooks%20No.6.pdf (access 11.10.2014)

Uwagi

EN

The financial support of the Ministry of Science and Higher Education under AGH contract no 11.11.110.299 is gratefully acknowledged. The authors wish to thanks prof A.S Wronski who edited this text.

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę