Showing papers by "Harpreet Singh Grewal published in 2017"
TL;DR: In this article, the slurry erosion performance of single phase Al 0.1 CoCrFeNi high entropy alloy was investigated under different impingement angles and at a constant velocity of 20m/s.
38 citations
TL;DR: In this paper, friction stir processing was utilized for enhancing the erosion-corrosion resistance of SS316L steel, most widely used material for marine applications, which showed nearly 3.5 times and 5 times higher erosion and corrosion resistance at oblique impingement.
29 citations
TL;DR: In this paper, the authors investigated the diffusion activation energy and diffusion kinetics of high entropy alloys (HEAs) for high temperature applications and found that the activation energy of Al0.1CoCrFeNi HEA is significantly higher than traditional steels and Ni-based super alloys.
Abstract: Activation energy and diffusion kinetics are important in modulating the high temperature oxidation behavior of metals. Recently developed multi-principal element alloys, also called high entropy alloys (HEAs), are promising candidate material for high temperature applications. However, the activation energies and diffusion kinetics of HEAs have been limitedly explored. We investigate the diffusional activation energy for oxidation of Al0.1CoCrFeNi HEA. Compared to conventional steels and Ni-based super alloys, the HEA showed a significantly higher diffusion activation energy. This behavior is explained based on low potential energy of the lattice and interstitial sites which effectively trap the atoms, limiting their diffusion. The atomic mean jump frequency for interstitial diffusion of oxygen in the HEA is four-orders of magnitude lower than T22 and T91 steels and seven-orders of magnitude lower compared to pure iron. Al0.1CoCrFeNi HEA showed the lowest oxidation rate compared to conventionally used steels, super-alloys, and coatings.
26 citations
TL;DR: In this paper, surface modification of austenitic stainless steel, SS316L, was done using friction stir processing, which resulted in significant grain refinement from 22μm to 0.67μm for the sample processed at 388-rpm under submerged cooling condition.
25 citations
TL;DR: In this paper, high strain-rate deformation of austenitic steel, SS316L, was performed by innovative submerged friction stir processing technique, which showed significant grain refinement for the sample processed under submerged conditions.
13 citations
TL;DR: In this paper, the authors examined the friction and wetting behavior of textured surfaces derived by mimicking the surface morphology of butterfly wing, and three different derivatives of mimicked structure with similar solid/air fraction but different contact aspect ratios were fabricated on Si wafer using photolithography and deep reactive ionetching techniques.
13 citations
TL;DR: In this article, the combined influence of capillary and van der Waals forces on the correlation between the adhesion (pull-off force) and friction of polymer patterns was studied and the existence of master curves in plot of adhesion versus friction, spanning nearly two orders of magnitude, was reported.
7 citations