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- 저자 : Sudhanshu S. Singh (검색결과 4 건)
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Vijay Mandal,Shashank Sharma,Sudhanshu S. Singh,J. Ramkumar 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Laser surface texturing can improve the surface properties of the metallic components. In this work, surface texturing hasbeen carried in a powder bed fusion of Inconel 718 (IN718) rather than material removal process. A 2D fnite element method(FEM) has been built to simulate the thermo-fuidic dynamics of surface texturing, incorporating the phase-feld method inthe preplaced IN718 powder. The temperature and induced velocity felds have been predicted using transient heat transferand fuid fow based on the conservation of mass, momentum, and energy in the melt pool. Furthermore, the roles of drivingforces such as Marangoni force, recoil pressure, and thermal buoyancy force on the melt pool behavior have been evaluated. Micro-textures were developed using laser on the powder bed by using diferent scanning patterns, such as line, circle, hatchand convex dimple. The efect of process parameters (pitch distance, number of pulses and number of layers) on the surfacehydrophobicity were evaluated by measuring the contact angle, where the convex dimple texture exhibited the maximumcontact angle. The hydrophobicity was afected by the ripples (2nd level of roughness) on the surface, which increased withan increase in number of pulses.
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Ashwani Kumar,Bhagyaraj Jayabalan,Chetan Singh,Jayant Jain,Subrata Mukherjee,Krishanu Biswas,Sudhanshu S. Singh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In the current study, lanthana (La2O3) based oxide dispersion strengthened (ODS) ferritic steels (Fe–xCr–1Ti–1W–0.5L2O3,x = 14, 18, 22, and 26, in wt%) have been fabricated by mechanical alloying and spark plasma sintering. The role of chromium(Cr) content and maximum sintering temperature (1050 and 1100 °C) on the density, microstructure and mechanical propertiesof the ODS steels have been studied. TEM analysis of the alloy revealed the presence of nano-sized (2–8 nm) complexoxide particles, i.e., La–Ti–Cr–O. Mechanical properties were estimated in terms of micro-hardness, nano-hardness, Young’smodulus and compressive strength. The highest micro-hardness (988 ± 11.3 HV) and compressive strength (2322 ± 49 MPa)were exhibited by the alloy having 26 wt% Cr, sintered at 1100 °C. The contribution of dispersion strengthening towards thestrength was calculated to be the highest (~ 72%). Overall, increasing the Cr content improved both the room temperaturecompressive strength as well as the compressive fracture strain.
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Effect of Precipitate Characteristics on the Corrosion Behavior of a AZ80 Magnesium Alloy
Dhananjay Dubey,Kondababu Kadali,Harikrishna Kancharla,Anuz Zindal,Jayant Jain,K. Mondal,Sudhanshu S. Singh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
In this study, a systematic investigation on the effect of both aging temperature (250 °C and 330 °C) and time (chosen basedon aging curves) on the distribution and volume fraction of the Mg17Al12precipitates and subsequently on the corrosionbehavior of the AZ80 magnesium alloy was carried out by conducting both immersion and dynamic polarization test in afreely aerated 3.5% NaCl solution. The analysis of corrosion products using Raman spectroscopy and X-ray diffraction andinvestigation of corrosion morphologies using scanning electron microscopy suggested galvanic corrosion of the anodicα-Mg matrix in contact with the cathodic Mg17Al12precipitates. The higher corrosion resistance of the alloy aged at lowertemperature (250 °C) was attributed to the higher number density of the Mg17Al12precipitates than that at higher temperature(330 °C). In the peak aged condition, the average number densities of precipitates (1/μm2) were measured to be ~ 0.74and ~ 0.32 and average corrosion rates (mm/y) were measured to be ~ 3.0 and ~ 5.0 at the aging temperatures of 250 °Cand 330 °C, respectively. At a particular aging temperature, the corrosion resistance increased to a maximum at peak-agedcondition followed by a decline in the over-aged condition and further increase with prolong aging, which was correlatedwith the number density, size and distribution of the Mg17Al12precipitates.
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Gokhale, Aditya,R, Sarvesha,Huang, E-Wen,Lee, Soo Yeol,Prasad, Rajesh,Singh, Sudhanshu S.,Jain, Jayant Elsevier 2019 Materials letters Vol.246 No.-
<P><B>Abstract</B></P> <P>In the present work, grain boundary sliding (GBS) has been studied for the grains exhibiting different orientations (for indentation parallel and perpendicular to < c > axis) at different temperatures (RT to 200 °C) using nanoindentation in pure Zn. Electron back scattered diffraction was utilized to determine the orientation of the indented grains and identify the deformation mechanism, whereas atomic force microscopy was utilized to systematically quantify the GBS. Results indicated that indentation perpendicular to < c > axis exhibits slip induced GBS, whereas the indentation parallel to < c > axis results in pure GBS. The amount of GBS was also found to be strongly dependent upon the orientation of the neighboring grain. Further, the contribution from GBS towards total stain was found to increase with an increase in temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First study that characterises orientation and temperature effect on GBS in Zn. </LI> <LI> Indentation perpendicular to <c> axis exhibits slip induced GBS. </LI> <LI> Indentation parallel to <c> axis results in pure GBS. </LI> <LI> The contribution of GBS increases with an increase in temperature. </LI> </UL> </P>
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