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Properties of duplex stainless steels made by powder metallurgy

Wybrane pełne teksty z tego czasopisma
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Purpose: of this paper was to examine the mechanical properties of duplex stainless steels. Design/methodology/approach: In presented study duplex stainless steels were obtained through powder metallurgy starting from austenitic, martensitic base powders by controlled addition of alloying elements, such as Cr, Ni, Mo and Cu. In the studies behind the preparation of mixes, Schaeffler's diagram was taken into consideration. Prepared mixes have been sintered in a vacuum furnace with argon backfilling at 1260 °C for 1 h. After sintering: rapid cooling have been applied in argon atmosphere. Produced duplex stainless steels have been studied by scanning and optical microscopy. Mechanical properties such as tensile strength, impact energy, hardness and wear rate were evaluated. Findings: According to achieved results, it was affirmed that applied sintering method as well as powder mixes preparation allows for manufacturing the sintered duplex steels with good mechanical properties which depends on austenite/ferrite ratio in the microstructure and elements partitioning between phases. The additions of alloying elements powders (promoting formation ferritic and austenitic phase) to master alloy powder, makes possible the formation of structure and properties of sintered duplex stainless steels. Sintered duplex steels obtained starting from austenitic and ferritic powders with admixture of elemental powders achieve lower mechanical properties when compared to composition obtained by mixing ferritic and austenitic powder in equal amounts. Research limitations/implications: According to the powders characteristic, the applied fast cooling rate seems to be a good compromise for mechanical properties and microstructures, nevertheless further tests should be carried out in order to examine different cooling rates. Originality/value: The use of elemental powders added to a stainless steel base showed its potentialities, in terms of fair compressibility and final sintered density. In addition a good microstructural homogeneity and first of all mechanical properties and corrosion resistance was achieved, also working with cycles possible for industries.
Rocznik
Strony
217--223
Opis fizyczny
Bibliogr. 15 poz., il., wykr.
Twórcy
autor
autor
  • Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland, leszek.dobrzanski@polsl.pl
Bibliografia
  • [1] P. K. Samal, J. B. Terrell, Mechanical properties improvement of PM 400 series stainless steels via nickel addition, Metal Powder Report (2001) 28-34.
  • [2] A. J. Rawlings, H. M. Kopech, H. G. Rutz, The effect of service temperature on the properties of ferritic P/M stainless steels, Proceedings of International Conference on Powder Metallurgy & Particulate Materials PM2TEC’1997, Chicago USA, 1997.
  • [3] W. Brian James, What is sinter-hardening?, Proceedings of International Conference on Powder Metallurgy & Particulate Materials PM2TEC’1998, Las Vegas, Nevada USA, 1998.
  • [4] D. Schaefer, C. J. Trombino, State of North American P/M industry 2005, Proceedings of International Conference on Powder Metallurgy & Particulate Materials PM2TEC’2005, Montreal, Canada, 2005.
  • [5] L. A. Dobrzański, Z. Brytan, M. Actis Grande, M. Rosso, E. J. Pallavicini, Properties of vacuum sintered duplex stainless steels, Journal of Materials Processing Technology 157-158 (2004) 312-316.
  • [6] M. Campos, A. Bautista, D. Caceres, J. Abenojar, J. M. Torralba, Study of the interfaces between austenite and ferrite grains in P/M duplex stainless steels, Journal of the European Ceramic Society 23 (2003) 2813-2819.
  • [7] P. Datta, G. S. Upadhyaya, Sintered duplex stainless steels from premixes of 316L and 434L powders, Materials Chemistry and Physics 67 (2001) 234-242.
  • [8] L. A. Dobrzański, Z. Brytan, M. Actis Grande, M. Rosso, Structure and mechanical properties of sintered duplex stainless steel, Proceedings of 12th International Scientific Conference Achievements in Mechanical and Materials Engineering AMME’2003, Gliwice-Zakopane, 2003, 211-214.
  • [9] M. Actis Grande, D. Ugues, M. Rosso, L. A. Dobrzański, Z. Brytan, The PM route for duplex stainless steels, Proceedings of 12th International Scientific Conference Achievements in Mechanical and Materials Engineering AMME’2003,Gliwice-Zakopane, 2003, 5-8.
  • [10] M. Actis Grande, D. Ugues, L. A. Dobrzański, Z. Brytan, M. Rosso, Properties of vacuum sintered duplex stainless steels, Proceedings of Powder Metallurgy World Congress & Exhibition PM2004, Vienna, Austria, 2004, 395-399.
  • [11] J. Kazior, T. Pieczonka, A. Molinari, Properties of AISI 316L, AISI 434L and duplex stainless steel, Proceedings of 8th International Scientific Conference Achievements in Mechanical and Materials Engineering AMME'1999, Gliwice-Rydzyna-Pawłowice-Rokosowo, 1999, 289-292.
  • [12] M. Campos, P. Sarasola, J. M. Torralba, Sintering evolution of duplex stainless steels obtained from austenitic and ferritic stainless steels powders mixtures, Proceedings of 9th International Scientific Conference Achievements in Mechanical and Materials Engineering AMME’2000, Gliwice-Sopot-Gdańsk, 2000, 83-86.
  • [13] D. Y. Kobayashi, S. Wolynec, Evaluation of the low corrosion resistant phase formed during the sigma phase precipitation in duplex stainless steels, Materials Research 2 (1999) 239-247.
  • [14] R. A. Perren, T. Suter, C. Solenthaler, G. Gullo, P. L. Uggowitzer, H. Böhni, M. O. Speidel, Corrosion resistance of super duplex stainless steels in chloride ion containing environments: investigations by means of a new microelectrochemical method II. Influence of precipitates, Corrosion Science 43 (2001) 727-730.
  • [15] L. A. Dobrzański, Z. Brytan, M. Actis Grande, M. Rosso, Corrosion resistance of sintered duplex stainless steel evaluated by electrochemical method, Journal of Achievements in Materials and Manufacturing 17 (2006) 317-320.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAN-0001-0027
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