Nehem Tudu
@nitjsr.ac.in
Research Scholar (Department of Production and Industrial Engineering)
National Institute of Technology Jamshedpur
RESEARCH INTERESTS
Additive manufacturing, welding, Inconel, Stainless Steel, Functionally Graded Material
Scopus Publications
Scholar Citations
Scholar h-index
Scopus Publications
Nehem Tudu, Mayuri Baruah, Arackal Narayanan Jinoop, Shashi Bhushan Prasad, Christ Prakash Paul, and Kushvinder Singh Bindra
SAGE Publications
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.
Nehem Tudu, Mayuri Baruah, and Shashi Bhushan Prasad
Informa UK Limited
Nehem Tudu, Mayuri Baruah, and Shashi Bhushan Prasad
Emerald
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.
Nehem Tudu, Mayuri Baruah, Shashi Bhushan Prasad, and Christ Prakash Paul
Springer Singapore
Mayuri Baruah, Shashi Bhusan Prasad, Nehem Tudu, Binay Kumar Murmu, and Subhash Singh
Elsevier BV