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Development of microstructure and mechanical properties of forgings in the thermomechanical treatment

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Warianty tytułu
PL
Kształtowanie struktury i właściwości mechanicznych odkuwek w procesie obróbki cieplno-plastycznej
Języki publikacji
EN
Abstrakty
EN
The work presents research results of the influence of thermomechanical treatment via forging on microstructure and mechanical properties of newly elaborated microalloyed steel containing of 0.28% C, 1.41% Mn, 0.028% Ti, 0.027% Nb, 0.019% V and 0.003% B. The investigated steel is assigned to the production of forged elements for the automotive industry. Conditions of forging using the thermomechanical processing method were developed based on plastometric tests. Observations of the microstructures of thin foils were conducted using a TITAN80-300 FEI transmission electron microscope. The applied thermomechanical treatment allows to obtain a fine-grained microstructure of the austenite during hot-working and production of forged parts. These acquire advantageous mechanical properties and guaranteed crack resistance after controlled cooling from the end plastic deformation temperature and successive tempering. Forgings produced using the thermomechanical treatment method, consecutively subjected to tempering in a temperature range from 550 to 650°C, reveal values of YS0.2 which equal from 994 to 939 MPa, UTS from 1084 to 993 MPa, KV from 69 to 109 J, KV–40 from 55 to 83 J, and a hardness ranging from 360 to 310 HBW. The results obtained in this paper make it possible to develop an industrial technology of forgings with high mechanical properties and guaranteed crack resistance, and also at a decreased temperature, by using the thermomechanical treatment method.
PL
W pracy przedstawiono wyniki badań struktury i właściwości mechanicznych odkuwek ze stali z mikrododatkami Ti, Nb, V i B typu HSLA wytworzonej w kontrolowanym procesie obróbki cieplno-plastycznej, poddanej następnie wysokiemu odpuszczaniu.
Rocznik
Strony
206--211
Opis fizyczny
Bibliogr. 22 poz., fig., tab.
Twórcy
autor
  • Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Gliwice
Bibliografia
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  • [11] Matlock D. K., Krauss G., Speer J. G.: Microstructures and properties of direct-cooled microalloy forging steels. Journal of Materials Processing Technology 117 (2001) 324÷328.
  • [12] Ulysse P.: Thermo-mechanical characterization of forged coated products during water quench. Journal of Materials Processing Technology 209 (2009) 5584÷5592.
  • [13] Skubisz P., Adrian H., Sińczak J.: Controlled cooling of drop forged microalloyed steel automative crankshaft. Archives of Metallurgy and Materials 1 (2011) 93÷107.
  • [14] Skubisz P., Sińczak J., Skowronek T., Rumiński M.: Selection of direct cooling conditions for automotive lever made of microalloyed steel. Archives of Civil and Mechanical Engineering 12 (2012) 418÷426.
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  • [17] Balart M. J., Davis C. L., Strangwood M.: Fracture behavior in mediumcarbon Ti–V–N and V–N microalloyed ferritic-pearlitic and bainitic forging steels with enhanced machinability. Materials Science and Engineering A 328 (2002) 48÷57.
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Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-b797d0c1-54f6-4544-8d50-0a1464021112
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