PRAGYA TRIPATHI

@iisc.ac.in

CV Raman Postdoctoral Fellow, Dept. of Mechanical Engineering, Indian Institute of Sciences, Bangalore
Indian Institute of Sciences Bengaluru

PRAGYA TRIPATHI


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https://researchid.co/pragya_31

RESEARCH INTERESTS

Surface Engineering, Tribology, Electrochemistry
12

Scopus Publications

308

Scholar Citations

9

Scholar h-index

9

Scholar i10-index

Scopus Publications

  • Fabrication of ex-situ TiN reinforced IN718 composites using laser powder bed fusion (L-PBF): Experimental characterization and high-fidelity numerical simulations
    Vijay Mandal, Pragya Tripathi, Shashank Sharma, Bhagyaraj Jayabalan, Subrata Mukherjee, Sudhanshu S. Singh, J. Ramkumar
    Ceramics International, 2023
    In this study, IN718 metal matrix composites (MMCs), with TiN content of 0–30 vol %, have been fabricated using laser powder bed fusion (L-PBF). The process has been carried out with varying scanning speeds of 500–800 mm/s, while maintaining constant laser power (100 W), hatch overlap (⁓ 50%) and layer thickness (⁓ 25 μm). A 2D numerical model has been established using the phase-field (PF) method to understand the role of driving forces (e.g., Marangoni force , thermal buoyancy force and recoil pressure) and deformation of melt pool behavior at different scanning speeds. In addition, the particle tracing model was coupled in the PF model to understand the motion of the reinforced particles. The microstructure of the fusion zone (or melt pool) has been predicted by evaluating the temperature gradient, solidification rate , and cooling rate. The solidification map of IN718 alloys indicated the microstructure of the fusion zone to be columnar dendrites at both the scanning speeds (500 mm/s and 800 mm/s). Depending upon the scanning speed, various defects (keyhole, balling and fusion defects) were observed in the fabricated composites. At 500 mm/s, the fabricated composite exhibited the lowest porosity (⁓ 0.27 vol%). The mechanical properties of MMCs were evaluated in terms of micro-hardness and wear resistance. The micro-hardness of MMCs increased with an increase in the TiN content and decrease in the scanning speed. The wear resistance of IN718 MMCs was found to improve when the TiN content was increased (up to 20% vol. %).
  • Large Area Surface Texturing Through Electrical Discharge Micromachining Process for Inducing Hydrophobicity
    Mahavir Singh, Pragya Tripathi, J. Ramkumar
    Lecture Notes in Mechanical Engineering, 2023
  • Effect of carbonaceous reinforcements on anticorrosive and magnetic properties of Ni-Cu based composite coatings prepared by pulsed electrodeposition
    Zuveria Firdouz, Pragya Tripathi, K. Mondal, Kantesh Balani
    Surface and Coatings Technology, 2022
  • A study on selective laser melting (SLM) of TiC and B4C reinforced IN718 metal matrix composites (MMCs)
    Vijay Mandal, Pragya Tripathi, Ashwani Kumar, Sudhanshu S. Singh, J. Ramkumar
    Journal of Alloys and Compounds, 2022
  • Water attenuation enhances tribological damage resistance in laser peened steel
    S. Gowthaman, Pragya Tripathi, S. Ariharan, Janakarajan Ramkumar, Kantesh Balani
    Materials Letters, 2022
  • Electrical discharge micro-texturing using compound tool electrodes for tribological and wettability applications
    Mahavir Singh, Pragya Tripathi, Janakarajan Ramkumar
    Surface Engineering, 2022
    The present work consists of large-area surface texturing through die-sinking electrical discharge machining (EDM) using compound tool electrodes. The compound tools were machined through the wire electrical discharge machining (WEDM). The micro-textured surfaces incorporating array of nearly square/circular-shaped micro-dimples, rectangular micro-channels and square micro-pillars were analysed for their wetting properties. An increase in water contact angle (CA) indicated higher water repellence for textured surfaces with respect to the untextured ones. Further, improved frictional behaviour was elicited through tribological analysis via the ball-on-disc test, revealing a lower average coefficient of friction (CoF) compared to the untextured surface. The wear volume of textured surfaces (micro-channels and micro-pillars) exhibited a slightly higher value with respect to the untextured surface, which can be ascribed to the stress concentration from microfeatures. However, the micro-dimpled textured surface showed a relatively lower wear volume, presenting a suitable micro-texture for improved tribological characteristics.
  • Enhancing the hydrophobicity of Ti–6Al–4V through multi-level electrical discharge texturing
    Mahavir Singh, Pragya Tripathi, Janakarajan Ramkumar
    Surface Engineering, 2022
    In the current work, single and multi-level micro-texturing on Ti–6Al–4V surfaces was performed through electrical discharge micromachining. The wetting properties of the single-level features obtained through EDMM have been studied, which revealed a higher water contact angle (CA) of ∼110° with respect to an untextured surface (water CA ∼38°). The concept of dimples overlapping (% of overlap between adjacent dimples) has been adopted to propose a novel technique for the simultaneous machining of multiple micro-features through a simpler cylindrical tool electrode, which otherwise necessitates multi-step fabrication or preformed tools. Adopting the proposed concept, multi-level textures consisting of micro-dimples surrounded by micro-pillars were machined on the Ti–6Al–4V surface. With multi-level textures, the water CA increases significantly compared to the untextured surfaces. The maximum water CA ∼ 104.2° was obtained with a 300 µm diameter tool and 25% dimple overlap, thereby rendering the surface hydrophobic.
  • Synergistic addition of yttria-stabilized zirconia and h-BN/graphene/diamond restricts multi-scale length wear of Cr-based hybrid coatings
    Pragya Tripathi, Janakarajan Ramkumar, Kantesh Balani
    International Journal of Refractory Metals and Hard Materials, 2021
    In the current study, electro-deposition of hybrid coatings consisting of Cr simultaneously reinforced with nano-scale 3 mol% yttria-stabilized zirconia (YSZ) along with hexagonal boron nitride (Cr-YSZ-BN), graphene (Cr-YSZ-Gr), and diamond (Cr-YSZ-D) was performed using an environmentally-benign trivalent Cr bath. Abrasive wear with ploughing for scratch test is recognized as the dominant wear mechanism in coatings; on increasing the scratch speed, gross spallation occurs in the BN reinforced coatings. While graphene and diamond were strongly adherent to the substrate with no signs of delamination. During fretting, oxidative and three-body abrasive wear in wedge formation mode with severe crack networking was observed in Cr-YSZ-BN. Micro-ploughing was active with intermittent cracking in Cr-YSZ-Gr coatings, indicating lower wear (via solid-lubrication by graphene). Diamond added coating, on the other hand, exhibits fewer cracks with ploughing. High hardness and elastic modulus with a maximum of ~26 GPa and 245 GPa, respectively, were obtained for Cr-YSZ-D coating with a minimum wear rate of ~3.5×10−11 m3/Nm (fretting) and 3.8×10−5 mm3/Nm (scratching). Further, rigid sp3 hybridization of carbon atoms in Cr-YSZ-D leads to the strong interlocking between Cr matrix and diamond, thereby lowering the wear damage of the coating system. The unique combination and uniform dispersion of YSZ and diamond particles displayed enhanced friction and wear resistance (k ~ 1.4×10−3), primarily due to the inherent high hardness of diamond and matrix strengthening by nano and micro-scale particles. Therefore, Cr-YSZ-D coating system emerges out as a highly robust coating capable of providing enhanced damage tolerance towards wear for various tribological applications.
  • Microscratching and fretting of electro-co-deposited Cr-based composite coatings with BN, graphene, and diamond reinforcements
    Pragya Tripathi, J. Ramkumar, K. Balani
    Journal of Materials Science, 2021
    Herein, enhanced damage tolerance of electrochemically processed Cr-based coatings reinforced with BN (Cr–BN), diamond (Cr–D) and graphene (Cr–Gr) is presented. The effect of micro-meter sized BN and diamond particles as well as 2D graphene nano-flakes in Cr matrix is studied due to its excellent mechanical properties and lubricating nature. The highest hardness of Cr–D (~ 23 GPa) is ascribed to the highest dislocation density of ~ 18×1011 cm−2, estimated through Taylor’s model. Scratch test revealed minimum wear volume and coefficient of friction of ~ 27 ± 0.47 × 10–14 m3 and 0.14, respectively, for Cr–D coating. Fretting wear results were concurrent with the scratch test, with Cr–D exhibiting minimum coefficient of friction (COF ~ 0.53) and wear loss (wear volume ~ 0.222 × 10–3 mm3). Diamond particles promote strong bonding due to mechanical interlocking, and efficient load transfer that restricts wear, and passes as a suitable reinforcement of Cr-coating for tribological applications subjected to high load and temperature conditions.
  • Synergistic role of carbon nanotube and yttria stabilised zirconia reinforcement on wear and corrosion resistance of Cr-based nano-composite coatings
    Pragya Tripathi, Prvan Kumar Katiyar, Janakarajan Ramkumar, Kantesh Balani
    Surface and Coatings Technology, 2020
    In the present work, electrodeposited chromium coatings were strengthened with 3 mol% yttria-stabilised zirconia nanoparticles (YSZ) and carbon nanotubes (CNT) to analyse anti-corrosive and wear properties of the coatings. Highest hardness (~24 GPa), minimum scratch wear rate i.e. ~3 × 10−11 m3/Nm and highest corrosion resistance of ~3.9 kΩcm2 was obtained by synergistic incorporation of YSZ and CNT in Cr matrix. This can be linked to high dislocation density ~22 × 1011 cm−2 (Orowan effect) and compressive residual stresses i.e. ~840 MPa (Cr-YSZ-CNT), which tend to seal-up micro-holes and cavities, thereby, restricting the onset of wear and corrosion in the matrix. Addition of inert YSZ nanoparticles imparts chemical stability as well as hardness to the Cr matrix (~11 GPa for Cr-YSZ, ~8.4 GPa for Cr). Further, CNT incorporation, apart from matrix strengthening, results in low COF (~0.12) due to self-lubricating nature of CNTs, which leads to reduced wear rate of ~3.8 × 10−11 m3/Nm (Cr-CNT) with respect to Cr and Cr-YSZ. Thus, barrier protection and corrosion inhibition might be protective mechanisms for Cr-YSZ-CNT coating that make it suitable for engineering and industrial applications in order to protect the vital components exposed to tribological and corrosive media conditions.
  • Laser peening enhances tribological resistance of electrodeposited Cr coatings reinforced with yttria stabilized zirconia and carbon nano tubes
    Pragya Tripathi, J. Ramkumar, Kantesh Balani
    Surface and Coatings Technology, 2019
  • Protective trivalent Cr-based electrochemical coatings for gun barrels
    Pragya Shukla, Shikha Awasthi, Janakarajan Ramkumar, Kantesh Balani
    Journal of Alloys and Compounds, 2018

RECENT SCHOLAR PUBLICATIONS

  • From Concept to Reality: Navigating the Challenges of Algorithm Deployment In Battery Energy Storage Systems
    A Goyal, V Nair, S Chopra, S Brahma, T Gangwar, V Yadav, P Tripathi, ...
    International Mechanical Engineering Congress and Exposition-India 89152 … , 2025
    2025
    Citations: 1
  • Navigating the Unknown and Uncertain: A Sensitivity-Driven Optimisation Framework for High-Fidelity Battery Modeling
    P Tripathi, R Relan
    International and National Conference on Multidisciplinary Design, Analysis … , 2024
    2024
    Citations: 2
  • Autopsy vis-à-vis defective preservation and dispatch: a retrospective audit of medicolegal histopathology
    M Khurana, HS Chhabra, S Das, P Tripathi
    SRHU Medical Journal 2 (1) , 2024
    2024
  • Voices from the Classroom: How Student Feedback Shapes Active Learning in Forensic Medicine.
    HS Chhabra, S Das, P Tripathi
    Journal of Punjab Academy of Forensic Medicine & Toxicology 24 (1) , 2024
    2024
  • Fabrication of ex-situ TiN reinforced IN718 composites using laser powder bed fusion (L-PBF): Experimental characterization and high-fidelity numerical simulations
    V Mandal, P Tripathi, S Sharma, B Jayabalan, S Mukherjee, SS Singh, ...
    Ceramics International 49 (9), 14408-14425 , 2023
    2023
    Citations: 21
  • Large area surface texturing through electrical discharge micromachining process for inducing hydrophobicity
    M Singh, P Tripathi, J Ramkumar
    Advances in Modern Machining Processes: Proceedings of AIMTDR 2021, 435-443 , 2022
    2022
    Citations: 1
  • Process for Inducing Hydrophobicity
    M Singh, P Tripathi, J Ramkumar
    Advances in Modern Machining Processes: Proceedings of AIMTDR 2021, 435 , 2022
    2022
  • Effect of carbonaceous reinforcements on anticorrosive and magnetic properties of Ni-Cu based composite coatings prepared by pulsed electrodeposition
    Z Firdouz, P Tripathi, K Mondal, K Balani
    Surface and Coatings Technology 441, 128560 , 2022
    2022
    Citations: 19
  • Electrical discharge micro-texturing using compound tool electrodes for tribological and wettability applications
    M Singh, P Tripathi, J Ramkumar
    SURFACE ENGINEERING, 1-17 , 2022
    2022
    Citations: 19
  • Enhancing the hydrophobicity of Ti–6Al–4V through multi-level electrical discharge texturing
    M Singh, P Tripathi, J Ramkumar
    Surface Engineering 38 (6), 651-663 , 2022
    2022
    Citations: 12
  • A study on selective laser melting (SLM) of TiC and B4C reinforced IN718 metal matrix composites (MMCs)
    V Mandal, P Tripathi, A Kumar, SS Singh, J Ramkumar
    Journal of Alloys and Compounds 901, 163527 , 2022
    2022
    Citations: 87
  • Water attenuation enhances tribological damage resistance in laser peened steel
    S Gowthaman, P Tripathi, S Ariharan, J Ramkumar, K Balani
    Materials Letters 308, 131175 , 2022
    2022
    Citations: 2
  • Synergistic addition of yttria-stabilized zirconia and h-BN/graphene/diamond restricts multi-scale length wear of Cr-based hybrid coatings
    P Tripathi, J Ramkumar, K Balani
    International Journal of Refractory Metals and Hard Materials 99, 105590 , 2021
    2021
    Citations: 6
  • Microscratching and fretting of electro-co-deposited Cr-based composite coatings with BN, graphene, and diamond reinforcements
    P Tripathi, J Ramkumar, K Balani
    Journal of Materials Science , 2021
    2021
    Citations: 17
  • Synergistic role of carbon nanotube and yttria stabilised zirconia reinforcement on wear and corrosion resistance of Cr-based nano-composite coatings
    P Tripathi, PK Katiyar, J Ramkumar, K Balani
    Surface and Coatings Technology 385, 125381 , 2020
    2020
    Citations: 28
  • Laser peening enhances tribological resistance of electrodeposited Cr coatings reinforced with yttria stabilized zirconia and carbon nano tubes
    P Tripathi, J Ramkumar, K Balani
    Surface and Coatings Technology 378, 124919 , 2019
    2019
    Citations: 27
  • Protective trivalent Cr-based electrochemical coatings for gun barrels
    P Shukla, S Awasthi, J Ramkumar, K Balani
    Journal of Alloys and Compounds 768, 1039-1048 , 2018
    2018
    Citations: 44
  • The basic properties of graphene and its applications
    M Kaur, PK Tripathi
    International Journal of Research and Analytical Reviews, 937-944 , 2018
    2018
    Citations: 4
  • Individual diversity needs to know brain hemisphericity
    P Tripathi, RR Singh
    2016
    Citations: 1
  • Effect of Azolla supplementation on semen quality, haematology and rumen metabolites in Barbari Bucks
    R Kumar, C Gangwar, P Tripathi, UB Chaudhary
    Indian Journal of Small Ruminants (The) 22 (2), 186-189 , 2016
    2016
    Citations: 9

MOST CITED SCHOLAR PUBLICATIONS

  • A study on selective laser melting (SLM) of TiC and B4C reinforced IN718 metal matrix composites (MMCs)
    V Mandal, P Tripathi, A Kumar, SS Singh, J Ramkumar
    Journal of Alloys and Compounds 901, 163527 , 2022
    2022
    Citations: 87
  • Protective trivalent Cr-based electrochemical coatings for gun barrels
    P Shukla, S Awasthi, J Ramkumar, K Balani
    Journal of Alloys and Compounds 768, 1039-1048 , 2018
    2018
    Citations: 44
  • Synergistic role of carbon nanotube and yttria stabilised zirconia reinforcement on wear and corrosion resistance of Cr-based nano-composite coatings
    P Tripathi, PK Katiyar, J Ramkumar, K Balani
    Surface and Coatings Technology 385, 125381 , 2020
    2020
    Citations: 28
  • Laser peening enhances tribological resistance of electrodeposited Cr coatings reinforced with yttria stabilized zirconia and carbon nano tubes
    P Tripathi, J Ramkumar, K Balani
    Surface and Coatings Technology 378, 124919 , 2019
    2019
    Citations: 27
  • Fabrication of ex-situ TiN reinforced IN718 composites using laser powder bed fusion (L-PBF): Experimental characterization and high-fidelity numerical simulations
    V Mandal, P Tripathi, S Sharma, B Jayabalan, S Mukherjee, SS Singh, ...
    Ceramics International 49 (9), 14408-14425 , 2023
    2023
    Citations: 21
  • Effect of carbonaceous reinforcements on anticorrosive and magnetic properties of Ni-Cu based composite coatings prepared by pulsed electrodeposition
    Z Firdouz, P Tripathi, K Mondal, K Balani
    Surface and Coatings Technology 441, 128560 , 2022
    2022
    Citations: 19
  • Electrical discharge micro-texturing using compound tool electrodes for tribological and wettability applications
    M Singh, P Tripathi, J Ramkumar
    SURFACE ENGINEERING, 1-17 , 2022
    2022
    Citations: 19
  • Microscratching and fretting of electro-co-deposited Cr-based composite coatings with BN, graphene, and diamond reinforcements
    P Tripathi, J Ramkumar, K Balani
    Journal of Materials Science , 2021
    2021
    Citations: 17
  • Enhancing the hydrophobicity of Ti–6Al–4V through multi-level electrical discharge texturing
    M Singh, P Tripathi, J Ramkumar
    Surface Engineering 38 (6), 651-663 , 2022
    2022
    Citations: 12
  • Effect of Azolla supplementation on semen quality, haematology and rumen metabolites in Barbari Bucks
    R Kumar, C Gangwar, P Tripathi, UB Chaudhary
    Indian Journal of Small Ruminants (The) 22 (2), 186-189 , 2016
    2016
    Citations: 9
  • Synergistic addition of yttria-stabilized zirconia and h-BN/graphene/diamond restricts multi-scale length wear of Cr-based hybrid coatings
    P Tripathi, J Ramkumar, K Balani
    International Journal of Refractory Metals and Hard Materials 99, 105590 , 2021
    2021
    Citations: 6
  • The basic properties of graphene and its applications
    M Kaur, PK Tripathi
    International Journal of Research and Analytical Reviews, 937-944 , 2018
    2018
    Citations: 4
  • Assessment of PET & ASL metabolism in the hippocampal subfields of MCI and AD using simultaneous PET-MR
    M Goubran, D Douglas, S Chao, A Quon, P Tripathi, D Holley, ...
    EJNMMI physics 2 (Suppl 1), A73 , 2015
    2015
    Citations: 4
  • Correlation between arterial spin labeling MRI and dynamic FDG on PET-MR in Alzheimer’s disease and non-Alzhiemer’s disease patients
    D Douglas, M Goubran, E Wilson, G Xu, P Tripathi, D Holley, S Chao, ...
    EJNMMI physics 2 (Suppl 1), A83 , 2015
    2015
    Citations: 4
  • Navigating the Unknown and Uncertain: A Sensitivity-Driven Optimisation Framework for High-Fidelity Battery Modeling
    P Tripathi, R Relan
    International and National Conference on Multidisciplinary Design, Analysis … , 2024
    2024
    Citations: 2
  • Water attenuation enhances tribological damage resistance in laser peened steel
    S Gowthaman, P Tripathi, S Ariharan, J Ramkumar, K Balani
    Materials Letters 308, 131175 , 2022
    2022
    Citations: 2
  • From Concept to Reality: Navigating the Challenges of Algorithm Deployment In Battery Energy Storage Systems
    A Goyal, V Nair, S Chopra, S Brahma, T Gangwar, V Yadav, P Tripathi, ...
    International Mechanical Engineering Congress and Exposition-India 89152 … , 2025
    2025
    Citations: 1
  • Large area surface texturing through electrical discharge micromachining process for inducing hydrophobicity
    M Singh, P Tripathi, J Ramkumar
    Advances in Modern Machining Processes: Proceedings of AIMTDR 2021, 435-443 , 2022
    2022
    Citations: 1
  • Individual diversity needs to know brain hemisphericity
    P Tripathi, RR Singh
    2016
    Citations: 1
  • Autopsy vis-à-vis defective preservation and dispatch: a retrospective audit of medicolegal histopathology
    M Khurana, HS Chhabra, S Das, P Tripathi
    SRHU Medical Journal 2 (1) , 2024
    2024