Nehem Tudu

@nitjsr.ac.in

Research Scholar (Department of Production and Industrial Engineering)
National Institute of Technology Jamshedpur

Nehem Tudu


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https://researchid.co/nehem_tudu

RESEARCH INTERESTS

Additive manufacturing, welding, Inconel, Stainless Steel, Functionally Graded Material
8

Scopus Publications

41

Scholar Citations

4

Scholar h-index

1

Scholar i10-index

Scopus Publications

  • Investigation on the tribological behavior of laser direct energy deposited SS304L - IN625
    T.V. Cyril, Jino Joshy, Nehem Tudu, Basil Kuriachen
    Tribology International, 2025
    In this study, SS304L and IN625 are deposited using the laser direct energy deposition technique in different combinations to perform as a functionally graded valve stem. Tribological study of each grade is performed individually using a linear reciprocating tribometer with gray cast iron as the counter-body. Experiments are carried out both at room-temperature (RT) and elevated-temperature (ET), and 75%IN625-25%SS304L (75IN+25SS) displayed better wear resistance in the RT sliding wear test. A fine-grained microstructure of 75IN+25SS resulted in higher hardness compared to other compositions. Formation of Cr₃C₂, Fe₃O₄, Fe₂O₃, and M₆C at the tribowear surface prevented the wear at ET. Adhesive and delamination wear are predominant at RT, while abrasive and oxidative wear dominate in the ET sliding wear test.
  • Repairment of Rail Axle by Laser Cladding Technique
    Nehem Tudu
    Springer Proceedings in Materials, 2025
  • Study of parametric effect on laser directed energy deposited Austenitic steel and Inconel functionally graded material
    Nehem Tudu, Mayuri Baruah, Arackal Narayanan Jinoop, Shashi Bhushan Prasad, Christ Prakash Paul, Kushvinder Singh Bindra
    Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science, 2023
    In this paper, the effect of process parameter on functionally graded materials (FGMs) of Inconel 625 (IN625) and Austenitic steel (SS304L) deposited by laser directed energy deposition (LDED) are investigated. For this purpose, FGM walls of different gradient of mix of IN625 and SS304L at different layers are deposited on Austenitic steel (SS316L) substrate at different sets of process parameters. For this study, the process parameters considered are laser power ( PL): 1000, 1300 and 1600 W, and scanning speed ( v): 0.3, 0.5 and 0.7 m/min. Deposited samples are then subjected to different tests such as energy dispersive spectroscopy (EDS), microhardness, scanning electron microscopy (SEM), X-ray diffraction (XRD), optical microscopy (OM), and nanoindentation. Tests performed on the samples revealed different effects of parameters on the deposition of the FGM wall. Based on the comparison of results of mechanical and metallurgical tests, it is observed that either at PL = 1300 W and/or v = 0.5 m/min, among the considered process parameters, show comparatively better results than the others.
  • Comparison of properties at the interface of deposited IN625 and mixture of IN625 SS304L by laser directed energy deposition and SS304L substrate
    Nehem Tudu, Mayuri Baruah, Shashi Bhushan Prasad
    Rapid Prototyping Journal, 2023
    Purpose Prior to manufacturing, designing plays a vital role in the selection of materials and other design parameters. Therefore, during the deposition of materials, substrate materials provide support and affect the microstructure of the deposits, which may not be desirable in the manufactured product. Hence, the main purpose of the study is to analyse the behaviour of the microstructure at the interface of deposited material and substrate. Design/methodology/approach In this study, two blocks of Inconel 625 (IN625) and Stainless steel 304L (SS304L) metal powders were deposited on an SS304L substrate using laser directed energy deposition (DED) technique. Deposited blocks comprised 50% IN625 + 50% SS304L or 100% IN625. After deposition, microstructural behaviour at the interface of the deposits and substrates was analysed using different tests such as optical microscopy (OM), microhardness testing, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). An improvement in microstructure was proposed by performing heat treatment of the deposited sample. Findings Formation of martensite and precipitates at the interface of the deposit and substrate was observed. Formation of martensite and precipitates such as α, carbide and δ phases were observed in OM and SEM images. Due to the formation of these phases, interface regions showed a peak in the hardness graphs. Post-heat treatment of the samples was one of the solutions to resolve these issues. Originality/value This paper suggests the formation of a heat-affected zone (HAZ) at the interface of the deposit and substrate, which may negatively affect the overall utility of the deposited part. The properties of the HAZ were investigated. To suppress these detrimental effects, post-heat treatment of the deposited sample was performed, and the samples were further analysed. The post-heat-treated samples exhibited as reduction in HAZ thickness and had more uniform hardness throughout the cross-section compared with the untreated samples.
  • Influence of parameters on mechanical and micro-structural properties of tungsten inert gas (TIG) welded joint of 1 mm thin Inconel 625 plates
    Indian Journal of Engineering and Materials Sciences, 2023
    Inconel 625 (IN625), since its invention, has been a material of choice for industries where components in service conditions are exposed to extremely high temperatures, corrosion, and oxidation environments. As per the American welding society for butt-joining such alloys in sheets, non-traditional techniques are the best means for producing permanent joints. These techniques require high-cost setup and high maintenance costs which are only economical for high-volume assembly line fabrication in mass-production facilities. Therefore, Tungsten Inert Gas (TIG) welding is highly suitable for producing defect-free autogenous weldments in high-strength alloy sheets with a thickness below 3mm. The current work focuses on the experimental investigation of the TIG welding of Inconel 1mm sheets. In this work, mechanical properties and microstructure are studied for controlled heat input of TIG welding. Current is varied from 40A to 65A and voltage from 10V to 12V. Only three combinations of parameters show sound weld visually and are analyzed by performing various testing. The main objective of the study is to find the feasible process parameters for the micro joining of IN625 sheets. From this discussion, it appears that arc energy, welding current, and voltage significantly affect the quality of the weld.
  • Study of laser directed energy deposition of Inconel 625 and austenitic steel
    Nehem Tudu, Mayuri Baruah, Shashi Bhushan Prasad
    Science and Technology of Welding and Joining, 2023
    Functionally graded material (FGM) is an advanced material that illustrates the number of properties in a single component. To develop FGM, it is very important to study each component gradient separately to understand the properties and their behaviour. This paper presents the study of the properties of deposited blocks of the different gradients of Inconel 625 (IN625) and stainless steel 304L (SS304L) (25% IN625 + 75% SS304L, 50% IN625 + 50% SS304L, 75% IN625 + 25% SS304L, and 100% IN625) by a laser directed energy deposition technique. Various tests were performed to understand its mechanical, metallurgical, and chemical behaviour. Deposited samples were heat-treated and then optical microscopy and microhardness were measured and compared to untreated ones and results found to be comparatively improved.
  • Influence of WEDM Parameters for Estimating the Surface Integrity of Laser Additive Manufactured Hybrid Material
    Nehem Tudu, Mayuri Baruah, Shashi Bhushan Prasad, Christ Prakash Paul
    Springer Proceedings in Materials, 2021
  • Experimental investigation of Inconel welded joints formed by pulsed micro plasma welding
    Mayuri Baruah, Shashi Bhusan Prasad, Nehem Tudu, Binay Kumar Murmu, Subhash Singh
    Materials Today Proceedings, 2020

RECENT SCHOLAR PUBLICATIONS

  • Investigation on the tribological behavior of laser direct energy deposited SS304L-IN625
    TV Cyril, J Joshy, N Tudu, B Kuriachen
    Tribology International 212, 110969 , 2025
    2025
    Citations: 3
  • Repairment of Rail Axle by Laser Cladding Technique
    N Tudu
    International Conference on Advances in Laser & Arc Cladding Technologies, 61-70 , 2023
    2023
  • Study of parametric effect on laser directed energy deposited Austenitic steel and Inconel functionally graded material
    N Tudu, M Baruah, AN Jinoop, SB Prasad, CP Paul, KS Bindra
    Proceedings of the Institution of Mechanical Engineers, Part C: Journal of … , 2023
    2023
    Citations: 2
  • Comparison of properties at the interface of deposited IN625 and mixture of IN625 SS304L by laser directed energy deposition and SS304L substrate
    N Tudu, M Baruah, SB Prasad
    Rapid Prototyping Journal 29 (4), 818-827 , 2023
    2023
    Citations: 14
  • Experimental analysis on functionally graded Material of inconel 625 and stainless steel 304l Developed by laser directed energy deposition
    N Tudu
    National Institute of Technology Jamshedpur , 2023
    2023
  • Study of laser directed energy deposition of Inconel 625 and austenitic steel
    N Tudu, M Baruah, S Bhushan Prasad
    Science and Technology of Welding and Joining 28 (4), 287-297 , 2023
    2023
    Citations: 9
  • Influence of parameters on mechanical and micro-structural properties of tungsten inert gas (TIG) welded joint of 1 mm thin Inconel 625 plates
    S Tripathi, N Tudu, M Baruah, R Ballav, SB Prasad
    Indian Journal of Engineering and Materials Science 30 (1), 87-93 , 2023
    2023
    Citations: 1
  • Influence of WEDM parameters for estimating the surface integrity of laser additive manufactured hybrid material
    N Tudu, M Baruah, SB Prasad, CP Paul
    Next Generation Materials and Processing Technologies: Select Proceedings of … , 2021
    2021
    Citations: 4
  • Morphological Study of Deposited IN625 and SS304L by Laser Directed Energy Deposition Method
    N Tudu, M Baruah, SB Prasad
    International Congress, IC2020, Advanced Welding Technology and Quality … , 2020
    2020
  • Experimental investigation of Inconel welded joints formed by pulsed micro plasma welding
    M Baruah, SB Prasad, N Tudu, BK Murmu, S Singh
    Materials Today: Proceedings 33, 5751-5756 , 2020
    2020
    Citations: 8
  • Simulation on Gap Conduction Effect during Lap Joint by Laser Transmission Welding
    N Tudu, M Baruah, SB Prasad
    Weld 2019, Seminar on Advances in Welding, Automation and Robotics for … , 2019
    2019
  • Determination of Cutting Force in an Orthogonal Machining Process of Composite Material Using Finite Element Analysis
    N Tudu
    National Institute of Technology Calicut , 2017
    2017
  • Design of a Hydraulic Floor Crane
    N Tudu, M Maji, P Kumar, V Yadav, AM Purty, R Kumar
    National Institute of Technology Durgapur , 2015
    2015

MOST CITED SCHOLAR PUBLICATIONS

  • Comparison of properties at the interface of deposited IN625 and mixture of IN625 SS304L by laser directed energy deposition and SS304L substrate
    N Tudu, M Baruah, SB Prasad
    Rapid Prototyping Journal 29 (4), 818-827 , 2023
    2023
    Citations: 14
  • Study of laser directed energy deposition of Inconel 625 and austenitic steel
    N Tudu, M Baruah, S Bhushan Prasad
    Science and Technology of Welding and Joining 28 (4), 287-297 , 2023
    2023
    Citations: 9
  • Experimental investigation of Inconel welded joints formed by pulsed micro plasma welding
    M Baruah, SB Prasad, N Tudu, BK Murmu, S Singh
    Materials Today: Proceedings 33, 5751-5756 , 2020
    2020
    Citations: 8
  • Influence of WEDM parameters for estimating the surface integrity of laser additive manufactured hybrid material
    N Tudu, M Baruah, SB Prasad, CP Paul
    Next Generation Materials and Processing Technologies: Select Proceedings of … , 2021
    2021
    Citations: 4
  • Investigation on the tribological behavior of laser direct energy deposited SS304L-IN625
    TV Cyril, J Joshy, N Tudu, B Kuriachen
    Tribology International 212, 110969 , 2025
    2025
    Citations: 3
  • Study of parametric effect on laser directed energy deposited Austenitic steel and Inconel functionally graded material
    N Tudu, M Baruah, AN Jinoop, SB Prasad, CP Paul, KS Bindra
    Proceedings of the Institution of Mechanical Engineers, Part C: Journal of … , 2023
    2023
    Citations: 2
  • Influence of parameters on mechanical and micro-structural properties of tungsten inert gas (TIG) welded joint of 1 mm thin Inconel 625 plates
    S Tripathi, N Tudu, M Baruah, R Ballav, SB Prasad
    Indian Journal of Engineering and Materials Science 30 (1), 87-93 , 2023
    2023
    Citations: 1
  • Repairment of Rail Axle by Laser Cladding Technique
    N Tudu
    International Conference on Advances in Laser & Arc Cladding Technologies, 61-70 , 2023
    2023
  • Experimental analysis on functionally graded Material of inconel 625 and stainless steel 304l Developed by laser directed energy deposition
    N Tudu
    National Institute of Technology Jamshedpur , 2023
    2023
  • Morphological Study of Deposited IN625 and SS304L by Laser Directed Energy Deposition Method
    N Tudu, M Baruah, SB Prasad
    International Congress, IC2020, Advanced Welding Technology and Quality … , 2020
    2020
  • Simulation on Gap Conduction Effect during Lap Joint by Laser Transmission Welding
    N Tudu, M Baruah, SB Prasad
    Weld 2019, Seminar on Advances in Welding, Automation and Robotics for … , 2019
    2019
  • Determination of Cutting Force in an Orthogonal Machining Process of Composite Material Using Finite Element Analysis
    N Tudu
    National Institute of Technology Calicut , 2017
    2017
  • Design of a Hydraulic Floor Crane
    N Tudu, M Maji, P Kumar, V Yadav, AM Purty, R Kumar
    National Institute of Technology Durgapur , 2015
    2015