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Your search keyword '"Ravisankar, B."' showing total 5 results
Start Over Author "Ravisankar, B." Topic structural steel
5 results on '"Ravisankar, B."'

4. Effect of temperature on structural steel (IS 2062) through equal channel angular pressing.

Author

Surendarnath, S., Kondaiah, G., Sankuru, Anil Babu, Ravisankar, B., and Sreenivasan, M.

Subjects
TEMPERATURE effect, TENSILE strength, STRUCTURAL steel, GRAIN refinement, MATERIAL plasticity, SURFACE cracks
Abstract

The present study gives the insight to understand the combined effect of temperature and Severe Plastic Deformation (SPD) on mechanical behavior and microstructural evaluation of structural steel (IS 2062) processed through Equal Channel Angular Pressing (ECAP). In the present research, the ECAP die of 12 mm channel diameter, 90° channel angle, and 20° corner angle was used. The experiments were carried out for two successive passes without any surface cracks. The grain refinement was analyzed using Optical Microscope. The crystallite size was measured using X- ray diffraction techniques. The micro-hardness and ultimate tensile strength were performed experimentally and compared with the microstructure result. After the tensile test, the mode of failures was measured through SEM analysis. At the end of the second pass, the ECAPed samples obtained better enhancement in the strength and the ductility has been reduced due to strain-induced in the sample, and grain refinement has taken place. The enhancement in the mechanical properties is due to the modification in the internal structures, such as grain refinement, dislocation density, and induced micro-strain. [ABSTRACT FROM AUTHOR]

Published
2022
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5. Enhancing the strength of structural steel through severe plastic deformation based thermomechanical treatment.

Author

Nagaraj, Murugan and Ravisankar, B.

Subjects
*STRUCTURAL steel, *PLASTICITY measurements, *THERMOMECHANICAL treatment, *MICROSTRUCTURE, *DISLOCATION density, *NANOINDENTATION
Abstract

Abstract Structural steel (hypoeutectoid steel) was subject to severe deformation through a novel method of thermo-mechanical processing coupled with equal channel angular pressing (ECAP). The ECAP experiment was conducted at a specific temperature for the hot ECAP (H-ECAP) process after which the sample gained a superior strength of 811 MPa with reasonable elongation. Whereas when the ECAP was conducted at room temperature (RT-ECAP), the sample strength was 659 MPa with an elongation of 16%. The electron backscattered diffraction (EBSD) analysis revealed grain refinement and grain misorientation as a result of the ECAP process. The H-ECAP process resulted in an increased pearlite volume fraction and uniform pearlite fragmentation due to the strain induced transformation generated by hot deformation. The internal structural modification of the pearlite grain was revealed in the TEM micrographs. Nanoindentation analysis further exposed carbon supersaturation in the ferrite matrix. The X-ray line profile analysis (XRDLPA) illustrated that the H-ECAP processed sample has a higher dislocation density than the RT-ECAP processed sample. Factors such as grain refinement, morphological changes in the grains and the dislocation density predominantly contribute to the increased strength of the H-ECAP processed sample. In the overall observation, H-ECAP processed sample exhibited superior mechanical properties than the RT-ECAP processed sample. [ABSTRACT FROM AUTHOR]

Published
2018
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