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Sanjay Kumar,Rakesh Sehgal,M.F. Wani,Mukund Dutt Sharma 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
This work is concerned with the experimental investigation of tribological and rheological properties ofcore–shell (carbonyl iron is the core and graphene oxide is the shell) particle-based MR fluid. Carbonyliron (CI) particles were encapsulated with graphene oxide (GO) by a simple wet stirring process. The surfacemorphology, structural properties, and magnetic properties of graphene oxide encapsulated CI particleswere analyzed by Field Emission Spectroscopy (FE-SEM), Raman Spectroscopy, and VibrationalSample Magnetometer (VSM). The rheological properties of prepared samples were examined on a modularcompact rheometer. The CI@GO particle-based MR fluid exhibited lower yield stress compared tobare CI particle-based MR fluid. Tribological tests of developed MR fluid were conducted on a universaltribometer with and without the presence of a magnetic field to ascertain the friction and wear behaviour. Experimental results revealed that the tribological properties are significantly improved by usingCI@GO-based MR fluid in comparison to bare CI-based MR fluid and dry sliding conditions. Further, thewear analysis of worn surfaces was observed on FE-SEM, Energy-Dispersive X-ray Spectroscopy (EDS),and 3D-profilometer before and after each test. Three body abrasion wear mechanism was observed withsome ploughing and groove formation.
Sanjeev Katoch,Vishal Singh,Rakesh Sehgal 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
Mechanical properties and microstructure evolution of diff erently cryogenically treated AISI-H11steel has been evaluated in this study. Parameters chosen for cryogenic treatment cycles are soaking temperature (− 154 °C and − 184 °C) and soaking duration (6, 21, and 36 h). Mechanical properties obtained have been characterized to comprehend the infl uence of cryogenic treatment parameters vis-à-vis vacuum heat treatment and tempering on the hardness, toughness and tensile strength. The samples cryogenically treated at − 184 °C for a soak duration of 6 h and tempered at 600 °C for 2 h showed higher hardness, samples cryogenically treated at − 184 °C for a soak duration of 36 h and tempered at 600 °C for 2 h showed higher toughness and showed 12.8% reduction in tensile strength in comparison to conventionally treated samples. X-ray diff raction analysis showed that retained austenite contents of samples treated with various cryogenic treatments reduces to near zero.
Assessment and Optimization of Cutting Parameters while Turning AISI 52100 Steel
Sharma, Vishal S.,Dhiman, Suresh,Sehgal, Rakesh,Sharma, Surinder Kumar Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.2
This investigation deals with machining AISI 52100 steel using a carbide-coated tool. The machining cutting force and tool tip temperature are measured online while turning using different cutting parameters. The surface roughness is also measured, but off-line after each cut. The obtained data are analyzed and the influence of the cutting parameters on the machining variables is determined in the form of plots. Regression models obtained from the results are tested using additional experimental data.
Assessment and Optimization of Cutting Parameters while Turning AISI 52100 Steel
Vishal S Sharma,Suresh Dhiman,Rakesh Sehgal,Surinder Kumar Sharma 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.2
This investigation deals with machining AISI 52100 steel using a carbide-coated tool. The machining cutting force and tool tip temperature are measured online while turning using different cutting parameters. The surface roughness is also measured, but off-line after each cut. The obtained data are analyzed and the influence of the Cutting parameters on the machining variables is determined in the form of plots. Regression models obtained from the results are tested using additional experimental data.