The impact of deformation on structural changes of the duplex steel

• Autorzy: Niewielski G. , Radwański K. , Kuc D.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Despite the many years' research on the plasticity of duplex steels, it was impossible to conclusively determine the mechanisms for structure recovery during the plastic deformation. The paper will attempt to provide explanations for the changes taking place in the steel structure during the superplastic flow. Design/methodology/approach: After a solution heat treatment at 1250 degrees centigrade, the steel was subjected to cold deformation through rolling with the total 70% reduction. The specimens were tensioned in the "Instron" strength-testing machine at temperature 850 degrees centigrade at a rate of vr=15x10 to the -3 mm/s in a 0.005Pa vacuum. Structural examination was carried out using light and electron microscopy. The micro-diffraction technique was applied to provide diffraction images with Kikuchi lines. Findings: A joint operation of structure reconstruction mechanisms during the deformation of the analyzed steel with the process of sigma phase precipitation inhibiting further growth of the newly-formed grain has been determined. Practical implications: The capacity for increased deformability through combined thermo-mechanical processes, requiring a precise selection of the deformation parameters, has been indicated. Originality/value: The results obtained are vital for designing an effective thermo-mechanical processing technology for the investigated steel.

Słowa kluczowe

EN

superplastic materials; plastic forming; microstructure; hot tensile test

PL

materiały nadplastyczne; obróbka plastyczna; mikrostruktura; próba rozciągania na gorąco

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 23, nr 1
• Strony: 31--34
• Opis fizyczny: Bibliogr. 14 poz., fot., rys., tab.

Twórcy

autor

Niewielski G.

autor

Radwański K.

autor

Kuc D.

• Faculty of Materials Science and Metallurgy, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

• [1] S.S.M. Tavares, M.R. da Silva, J.M. Pardal, H.F.G. Abreu, A.M. Gomes, Microstructural changes produced by plastic deformation in the UNS S31803 duplex stainless steel, Journal of Materials Processing Technology 180 (2006) 318-322.
• [2] A.I. Filho, J.M.D.A. Rollo, R.V. Silva, G. Martinez, Alternative process to manufacture austenitic-ferritic stainless steel wires, Materials Letters 59 (2005) 1192-1194.
• [3] J.M. Cabrera, A. Mateo, L. Llanes, J.M. Prado, M. Anglada, Hot deformation of duplex stainless steels, Journal of Materials Processing Technology 143-144 (2003) 321-325.
• [4] K. Osada, Commercial applications of superplastic forming, Journal of Materials Processing Technology 68 (1997) 241-245.
• [5] D.C.J. Farrugia, Prediction and avoidance of high temperature damage in long product hot rolling, Journal of Materials Processing Technology 177 (2006) 486-492.
• [6] CM. Garzón, A.P. Tschiptschin, EBSD texture analysis of a high temperature gas nitrided duplex stainless steel, Materials Science and Engineering 441 (2006) 230-238.
• [7] G. Niewielski, D. Kuc, Structure and properties of high-alloy steels, Publishing House of The Silesian University of Technology, Gliwice, 2004, 199-221.
• [8] M. Hetmańczyk, G. Niewielski, D. Kuc, Modelling of the structure changes during soaking to plastic deformation, Proceedings of the 8th International Science Conference “Achievements in Mechanical and Materials Engineering” AMME'99. Gliwice-Rydzyna, 1999, 249-252.
• [9] J.M. Cabrera, A. Mateo, L. Llanes, J.M. Prado, M. Anglada. Hot deformation of duplex stainless steels, Journal of Materials Processing Technology 143-144 (2003) 321-325.
• [10] J.J. Moverare, M. Odén, Deformation behaviour of a prestrained duplex stainless steel, Materials Science and Engineering 337 (2002) 25-38.
• [11] A.I. Filho, J.M.D.A. Rollo, R.V. Silva, G. Martinez. Alternative process to manufacture austenitic-ferritic stainless steel wires, Materials Letters 59 (2005) 1192-1194.
• [12] Gironès, L. Llanes, M. Anglada, A. Mateo, Dynamic strain ageing effects on superduplex stainless steels at intermediate temperatures, Materials Science and Engineering 367 (2004) 322-328.
• [13] D.Kuc, G. Niewielski, K. Radwański, The structure and plasticity changes in stainless steels after hot-deformation processes, Proceedings of the 11th International Scientific Conference on "Contemporary Achievements in Mechanics. Manufacturing and Materials Science" CAM3S'2005. Gliwice-Zakopane. 2005. 215-231.
• [14] K. Radwański. G. Niewielski. D.Kuc. The influence of thermo-mechanical processing on deformability and structural changes of duplex steel. Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 175-178.