Warianty tytułu
Konferencja
12th International Scientific Conference CAM3S'2006, 27-30th November 2006, Gliwice-Zakopane
Języki publikacji
Abstrakty
Purpose: of this paper was to examine the influence of sintering parameters like time, temperature, atmosphere and gas pressure under cooling stage on 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 compacted at 800 MPa and sintered in a vacuum furnace with argon backfilling at temperatures from 1200 to 1285 degrees centigrade for 0,5, 1 and 2 h. After sintering different cooling cycles were applied using nitrogen under pressure from 0.6 MPa to 0.002 MPa in argon atmosphere. Produced duplex stainless steels have been studied by scanning and optical microscopy and EDS chemical analysis of microstructure components. Mechanical properties have been studied through tensile test. Findings: Mechanical properties of sintered stainless steels are strictly connected with the density and the pore morphology present in the microstructure too and especially of cooling rate directly from sintering temperature. The lowest cooling rate - applied gas pressure, the mechanical properties decrease due to precipitation of sigma phase. Mechanical properties of studied steels depends on austenite/ferrite ratio in the microstructure and elements partitioning between phases too. Research limitations/implications: Applied fast cooling rate seems to be a good compromise for mechanical properties and obtained microstructures, nevertheless further tests should be carried out in order to examine it influence on corrosion properties. 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 good mechanical properties was achieved, also working with cycles possible for industries.
Rocznik
Tom
Strony
231-234
Opis fizyczny
Bibliogr. 15 poz., rys., tab.
Twórcy
autor
autor
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 18 a, 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 December 2001, (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’97, Chicago USA 1997.
- [3] W. Brian James, What is sinter-hardening?, Proceedings of International Conference on Powder Metallurgy l Particulate Materials PM2TEC’98, Las Vegas. Nevada USA, 1998.
- [4] M. Rosso, M. Actis Grande, D. Ornato, Sintering of duplex stainless steels and their properties, Powder Metallurgy Progress vol. 2 (2002) 10-17.
- [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 Vol. 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 Vol. 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 Vol. 67 (2001) 234-242.
- [8] L.A. Dobrzański, Z. Brytan, M. Rosso, M. Actis Grande: Corrosion behavior of vacuum sintered Duplex Stainless Steels, Proceedings of the International Conference on Advanced Materials and Processing Technologies, AMPT'2006, Las Vegas, Cd-rom.
- [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 AMME'03, 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 nExhibition PM2004, Vienna, Austria Vol. 3 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 AMME’1999, Gliwice 1999 289.
- [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 AMME'2000, Gliwice - Sopot - Gdańsk, Poland, 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, Vol 2 No. 4 (1999) 239-247.
- [14] L.A. Dobrzański, Z. Brytan, M. Actis Grande, M Rosso, Corrosion resistance of sintered duplex stainless steel evaluated by electrochemical method, Worldwide Journal of Achievements in Materials and Manufacturing, vol. 17, (2006) 317-320.
- [15] L.A. Dobrzański, Z. Brytan, M. Actis Grande, M. Rosso, Sintered Duplex Stainless Steels Corrosion Properties, Materials Science Forum Vols 534-536 (2007) 721-724.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BOS5-0018-0047