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RISS 인기검색어
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- 저자 : C. Jr. Aranas (검색결과 2 건)
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Effect of Double Hit Hot Deformation on the Evolution of Dynamically Transformed Ferrite
K. Chadha,C. Aranas Jr.,M. Jahazi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Double-hit hot compression tests were carried on medium-carbon low-alloy steels using Gleeble 3800® thermomechanicalsimulator. The experiments were performed at strain rates of 0.25 and 0.5 s−1 and temperatures of 1150 and 1200 °C withinterpass times of 5, 15, and 25 s. The onset of critical stresses for dynamic transformation (DT) for both first and second hitwere detected using the double-differentiation method. It was found that the critical stress for DT increased with a decreasein temperature and an increase in strain rate. The presence of dynamically transformed ferrite was observed and quantifiedusing electron-backscatter diffraction, kernal average misorientation, and grain boundary maps. Then, a thermodynamicanalysis was carried out using JmatPro software. A method of determining the change in Gibbs energy during DT phenomenonis proposed for double hit deformation.
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On the Role of Chromium in Dynamic Transformation of Austenite
K. Chadha,Davood Shahriari,C. Jr. Aranas,Louis‑Philippe Lapierre‑Boire,Mohammad Jahazi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The effect of Chromium (Cr) on the dynamic transformation (DT) of austenite to ferrite at temperatures up to 430 °C aboveAe3was studied in a medium-carbon low-alloy steel. Hot compression tests were performed using Gleeble 3800® thermomechanicalsimulator followed by microstructural examinations using electron microscopy (FESEM-EBSD). Driving forcecalculation using austenite flow stress and ferrite yield stress on an inverse absolute temperature graph indicated that Crincreases the driving force for the transformation of austenite to ferrite; however, when the influence of stress and thermodynamicanalysis are taken into account, it was observed that Cr increases the barrier energy and therefore, emerges as abarrier to the transformation. An analysis, based on lattice and pipe diffusion theories is presented that quantifies the role ofstress on the diffusivity of Cr and is compared with other the main alloying elements such as C, Si and Mn and its impact,positive or negative, on the DT barrier energy. Finally, a comparison is made on the differential effects of temperature andstress on the initiation of DT in medium-carbon low-alloy steels.
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