Experimental methods of metal forming

• Autorzy: Groger M. , Cizek L. , Hernas A.
• Języki publikacji: EN

Abstrakty

EN

Methods of severe plastic deformation should meet a number of requirements which are to be taken into account while developing them for formation of nanostructures in bulk samples and billets. These requirements are as follows. Firstly, it is important to obtain ultra fine-grained structures with prevailing high-angle grain boundaries since only in this case can a qualitative change in properties of materials occur. Secondly, the formation of nanostructures uniform within the whole volume of a sample is necessary for providing stable properties of the processed materials. Thirdly, though samples are exposed to large plastic deformations they should not have any mechanical damage or cracks. Traditional methods of severe plastic deformation, such as rolling, drawing or extrusion cannot meet these requirements. Formation of nanostructures in bulk samples is impossible without application of special mechanical schemes of deformation providing large deformations at relatively low temperatures as well as without determination of optimal regimes of material processing. At present the majority of the obtained results are connected with application of equal channel angular pressing There are known some investigations on formation of nano- and submicrocrystalline structures in various metals and alloys by means of multiple forging. The present section is devoted to the questions of realization of the SPD methods mentioned above, their modelling and optimal regimes. Data on evolution of initial microstructure and its transformation to a nanostructured state during severe plastic deformation are also considered here.

PL

W artykule dokonano przeglądu nowoczesnych metod kształtowania metali zmierzających do formowania nanostruktury oraz ultradrobnoziarnistej struktury metali, zapewniających odpowiedni stopień oraz jednorodność przerobu i tym samym uzyskanie jednorodnych własności w całej objętości odkształcanego metalu. Podczas kształtowania nanostruktur w masowych próbkach i kęsach należy uwzględnić szereg uwarunkowań zarówno teoretycznych jak i technologicznych. Po pierwsze, ważne jest uzyskanie ultra-drobnoziarnisty eh struktur z dominującymi szerokokątowymi granicami ziarn. Po drugie, kształtowanie nanostruktur jednorodnych w całej objętości próbki jest konieczne, aby zapewnić stabilne i jednorodne właściwości obrabianych materiałów Po trzecie materiały poddane dużym odkształceniom plastycznym, nie powinny mieć żadnych wad mechanicznych lub pęknięć

Słowa kluczowe

EN

plastic deformation; forming of metals; forging, formation of nanostructure

PL

odkształcanie plastyczne; kształtowanie metali; kucie; kształtowanie nanostruktury metali

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Hutnik, Wiadomości Hutnicze
• Rocznik: 2008
• Tom: Vol. 75, nr 5
• Strony: 235--242
• Opis fizyczny: Bibliogr. 17 poz., rys.

Twórcy

autor

Groger M.

autor

Cizek L.

autor

Hernas A.

• VSB-Technical University of Ostrava, Department of Materials Engineering 17.1istopadu 15, 708 33 Ostrava, Czech Republic,

Bibliografia

• 1. Stolyarov V. V. et al.: In: Investigations and Applications of Severe Plastic Deformation, p. 367
• 2. Greger M. et al.: Possibilities of aluminium extrusion with use of the ECAP method. In IX international conference Aluminium in transport 2003, Fotobit, Krakow 2003, p.165
• 3. Greger M., Čížek L., Kocich R., Hernas A.: Metallurgical aspects of rolling of magnesium alloy AZ91. 9th International research/expert conference TMT 2005. Antalya, Turkey: Development of Machinery and Associated Technology, 2005, p. 195
• 4. Greger M., Kocich R., Kander L.: Al 6082 alloy properties after extrusion by ECAP technology. In Aluminium 2005 Děčín: Alcan Extrusion 2005, p. 141-146, ISSN 1335-2334
• 5. Beyerlein I. J., Lebensohn R. A., Tomé C. N.: Ultrafine Grained Materials II. TMS Seattle, 2002, p. 585
• 6. Greger M., Kocich R., Kander L., Hernas A.: Development of fine grained structure low carbon steel using ARB technology. In 10 th International research/expert conference TMT 2006. University of Zenica, Universitat politetecnica de Catalunya and Bahcesehir university Istambul. Barcelona 2006, p. 1291
• 7. Greger M., Kocich R.: Verification of the ECAP technology. In NANO ´05. Brno University of Technology. Brno 2005, p. 314
• 8. Kumar K., Swygenhoven H. V., Suresh S.: Mechanical behavior of nanocrystalline metals and alloys. Acta Mater. 51, (2003), p. 543
• 9. Greger M., et al.: Structure development and cracks creation during extrusion of aluminum alloy 6082 by ECAP method. In Degradacia. Žilina 2005, p.152
• 10. Jamashita A., Horita Z., Langdon, T. G.: Improving the mechanical properties of magnesium and magnesium alloy through severe plastic deformation, Mat. Sc. Eng. A300, (2001), p. 142
• 11. Greger M., Čížek L., Muskalski Z.: Microstructure and properties of ultrafine grained aluminium alloy processed by ECAP. Mechanika Nr. 318/2006. (88), Zeszyty naukowe Politechnika Opolska, Opole 2006, p. 51
• 12. Greger M., Čížek L., Jonšta Z., Hernas A.: Structure characteristics and formability of 12% Cr steel for ECAP dies. In XIII Seminarium Naukowego: Nowe Technologie i materialy w metalurgii i inženierii materialowej, Katowice: Politechnika Slaska, 2005, p. 99
• 13. Greger M., Kocich R., Kander L.: Equal channel angular pressing of cooper. Transactions of the VŠB-Technical University of Ostrava, Metallurgical Series, vol. 48 (2005), no. 1, p. 81
• 14. Greger M.: Verification of the ECAP technology. 10 th International conference Technology 2007. SF STU Bratislava, Bratislava 2007, p. 73
• 15. Juany W. H., Chány L., Kao P. W., Chang C. P.: Effect of die angle on the deformation texture of copper processed by equal channel angular extrusion. Materials Science and Engineering A307 (2001), p. 113
• 16. Mughrabi H.: Some aspects of fatigue of engineering materials. 3th International Conference on Materials Structure. Elsevier Sc., p. 13
• 17. Greger M., Kocich R., Kuretova B.: The structure and properties of low carbon steel by ARB method, Forming 2007, p. 81