INTRAGRANULAR FERRITE MORPHOLOGIES IN MEDIUM CARBON VANADIUM-MICROALLOYED STEEL

  • Abdunnaser Fadel University of Belgrade Faculty of Technology and Metallurgy Dpt. of Metallurgical Engineering
  • Nenad Radovic University of Belgrade Faculty of Technology and Metallurgy Dpt. of Metallurgical Engineering
  • Dragomir Glišić
  • Djordje Drobnjak
Keywords: TTT diagram, acicular ferrite, Bainite, Grain Boundary Ferrite, Widmanstatten and Polygonal Ferrite, Pearlite, nucleation,

Abstract


The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies. The isothermal treatment was carried out at 350, 400, 450, 500, 550 and 600 οC. These treatments were interrupted at different times in order to analyze the evolution of the microstructure. Metallographic evaluation was done using optical and scanning electron microscopy (SEM). The results show that at high temperatures (≥ 500 ○C) polygonal intragranulary nucleated ferrite idiomorphs, combined with grain boundary ferrite and pearlite were produced and followed by an incomplete transformation phenomenon. At intermediate temperatures (450, 500 ○C) an interloced acicular ferrite (AF) microstructure is produced, and at low temperatures (400, 350 ○C) the sheave of parallel acicular ferrite plates, similar to bainitic sheaves but intragranularly nucleated were observed. In addition to sheaf type acicular ferrite, the grain boundary nucleated bainitic sheaves are observed

Author Biographies

Dragomir Glišić
University of Belgrade
Faculty of Technology and Metallurgy
Dpt. of Metallurgical Engineering
Djordje Drobnjak
University of Belgrade
Faculty of Technology and Metallurgy
Dpt. of Metallurgical Engineering

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Published
2014/02/10
How to Cite
Fadel, A., Radovic, N., Glišić, D., & Drobnjak, D. (2013). INTRAGRANULAR FERRITE MORPHOLOGIES IN MEDIUM CARBON VANADIUM-MICROALLOYED STEEL. Journal of Mining and Metallurgy, Section B: Metallurgy, 49(3), 237. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/2409
Issue
Vol. 49 No. 3 (2013)
Section
Original Scientific Paper

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