EFFECT OF DEFORMATION STRAIN RATE WITHIN THE INTER-CRITICAL (α+γ) REGION ON FERRITE GRAIN REFINEMENT IN MICROALLOYED STEEL

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EGHBALI B.A.

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Journal: INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING) Year:2009 | Volume:25 | Issue:47 (ISSUE FOCUS: MATERIALS SCIENCE AND ENGINEERING) Page(s): 25-31

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Title

EFFECT OF DEFORMATION STRAIN RATE WITHIN THE INTER-CRITICAL (α+γ) REGION ON FERRITE GRAIN REFINEMENT IN MICROALLOYED STEEL

Author(s)

EGHBALI B.A. | Issue Writer Certificate

Keywords

MICROALLOYED STEELQ3

THERMOMECHANICAL TREATMENTQ3

TORSION TESTQ3

STRAIN RATEQ3

FERRITEQ3

Abstract

In the present research, a warm TORSION TESTing technique was carried out on low carbon Nb-Ti MICROALLOYED STEEL. The schedule was conducted in a two phase (a+g) region. The effect of the deformation STRAIN RATE on the mechanism of dynamic softening and grain refinement of FERRITE during the warm deformation was investigated. The physical processes that occur during deformation were studied by analyzing the true stress true strain flow curves of FERRITE. Examination of the microstructural evolution was carried out by optical microscopy. The mechanism of the equiaxed fine FERRITE grains (EFG) formation was investigated by means of high resolution electron back scattered diffraction (EBSD) measurements. This was carried out using a Field Emission Gun Leo Scanning Electron Microscope. Microstructural studies show that equiaxed fine FERRITE grains are produced during deformation within the intercritical (a+g) region. The EBSD results show that, as the STRAIN RATE increases, the percentage of high angle boundaries increases and that of low angle boundaries decreases. It was considered that the dynamical formation of new fine grains was caused by continuous dynamic recrystallization (CDRX) of FERRITE. With increasing STRAIN RATE, the EFG size of the FERRITE reduces and its volume fraction increases. These implied that increasing the STRAIN RATE has a positive effect on the CDRX process of FERRITE.

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APA: Copy

EGHBALI, B.A.. (2009). EFFECT OF DEFORMATION STRAIN RATE WITHIN THE INTER-CRITICAL (α+γ) REGION ON FERRITE GRAIN REFINEMENT IN MICROALLOYED STEEL. INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING), 25(47 (ISSUE FOCUS: MATERIALS SCIENCE AND ENGINEERING)), 25-31. SID. https://sid.ir/paper/107640/en

Vancouver: Copy

EGHBALI B.A.. EFFECT OF DEFORMATION STRAIN RATE WITHIN THE INTER-CRITICAL (α+γ) REGION ON FERRITE GRAIN REFINEMENT IN MICROALLOYED STEEL. INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING)[Internet]. 2009;25(47 (ISSUE FOCUS: MATERIALS SCIENCE AND ENGINEERING)):25-31. Available from: https://sid.ir/paper/107640/en

IEEE: Copy

B.A. EGHBALI, “EFFECT OF DEFORMATION STRAIN RATE WITHIN THE INTER-CRITICAL (α+γ) REGION ON FERRITE GRAIN REFINEMENT IN MICROALLOYED STEEL,” INDUSTRIAL ENGINEERING & MANAGEMENT SHARIF (SHARIF: ENGINEERING), vol. 25, no. 47 (ISSUE FOCUS: MATERIALS SCIENCE AND ENGINEERING), pp. 25–31, 2009, [Online]. Available: https://sid.ir/paper/107640/en

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