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- 저자 : Sangeeta Khare (검색결과 2 건)
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Controlling the Ferrite Kinetics in Fe-C-Mn Alloys
Sangeeta Khare,Puneet Mahajan 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.3
The phase transformation of austenite to ferrite in Fe-C-Mn system is studied by varying systematically concentration of C and Mn using DICTRA software. Ferrite kinetics is controlled by the partitioning of elements between ferrite and austenite phases. The elements that stabilize austenite phase tend to partition more towards the austenite phase as compared to the ferrite phase. The ferrite fraction, the rate of migration of the interface and the partitioning of elements between austenite and ferrite phases are evaluated by varying concentration of C and Mn in Fe-C-Mn system. The fraction of ferrite decreases with the increase in concentration of C and Mn. These elements influence ferrite kinetics through a growth process which occurs either under partition local equilibrium mode or negligible partition local equilibrium mode. The results show that both Mn and C retard ferrite transformation in Fe-C-Mn alloy. It is possible to get the desired fraction of ferrite by controlling the relative concentration of C and Mn.
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Determination of Johnson–Cook Material Parameters for Armour Plate Using DIC and FEM
Sangeeta Khare,Krishna Kumar,Shashank Choudhary,Pundan Kumar Singh,Rahul Kumar Verma,Puneet Mahajan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Understanding of material behavior of armour steel under large deformations and high strains during loading is very crucial indesigning steel structures for various applications. Johnson–Cook flow stress and Johnson–Cook failure models were adoptedfor modeling and predicting the material flow behavior of armour plate. The material parameters of Johnson–Cook flowstress have been determined experimentally from tests performed at different strain rates (10−4–1550 s−1) and temperatures(25–600 °C). The damage parameters of Johnson–Cook failure model were determined through experiments on flat tensilespecimens in combination with finite element simulation. Using these materials parameters, finite element simulations wereperformed on notch specimens of different radii between 2 mm and 20 mm loaded under tension. Load-strain curves werein good agreement with the experimentally obtained data. Triaxiality obtained from simulation were matched against thereported values from the literature.
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