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Browsing by Author "Mahajan, D.K."

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Cavitation erosion mechanisms of HVOF-sprayed Ni-based cermet coatings in 3.5% NaCl environment

Singh, N.K.; Vinay, G.; Ang, A.S.M.; Mahajan, D.K.; Singh, H. (2022-05-04)

Monel K-500 is a nickel-based alloy that is a widely used material in industries like hydraulic, chemical and marine. In its marine application, such as in seawater, Monel alloy suffers from high cavitation and corrosion. ...
Cavitation erosion resistant nickel-based cermet coatings for monel K-500

Singh, N.K.; Ang, A.S.M.; Mahajan, D.K.; Singh, H. (2021-04-01)

WC-NiCr and WC-Hastelloy C coatings were deposited on Monel K-500 substrate by HVOF-spray with an aim to enhance cavitation erosion resistance of the alloy. The cavitation tests were performed for 10 h following ASTM G32-10 ...
Coupled diffusion-mechanics framework for simulating hydrogen assisted deformation and failure behavior of metals

Singh, V.; Kumar, R.; Charles, Y.; Mahajan, D.K. (2022-11-11)

Understanding of years-old multifaceted hydrogen-assisted damage evolution necessitates efforts to model the coupled diffusion-mechanics response in metallic materials. Informed by the dislocation-hydrogen interactions, ...
Effect of microstructural features on short fatigue crack growth behaviour in SA508 Grade 3 Class I low alloy steel

Singh, R.; Singh, A.; Singh, P.K.; Mahajan, D.K. (2020-12-16)

Aim of the paper is to understand the effect of microstructural features of SA508 Grade 3 Class I low alloy steel (LAS) on short crack propagation rate under cyclic loading. The complex upper bainitic microstructure of ...
Effect of multi-walled carbon nanotubes on DC electrical conductivity and acetone vapour sensing properties of polypyrrole

Husain, A.; Mahajan, D.K. (2022-11-21)

Polypyrrole (PPy) and polypyrrole/multi-walled carbon nanotubes nanocomposite (PPy/MWCNTs) were synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron ...
Hydrogen assisted crack initiation in metals under monotonic loading: a new experimental approach

Arora, A.; Kumar, R.; Singh, H.; Mahajan, D.K. (2021-02-18)

Hydrogen is foreseen as a promising energy carrier that can control global warming by reducing CO2 emissions. However, hydrogen is associated with an embrittlement phenomenon that imparts substantial damage to the infrastructure ...
Hydrogen distribution in metallic polycrystals with deformation

Kumar, R.; Mahajan, D.K. (2020-03-09)

To understand hydrogen embrittlement and predict probable damage sites based on high hydrogen segregation, it is important to identify hydrogen distribution mechanisms in metallic microstructure with deformation. Hydrogen ...
Hydrogen induced blister cracking and mechanical failure in X65 pipeline steels

Singh, V.; Singh, R.; Arora, K.S.; Mahajan, D.K. (2019-08-22)

The present work aims to investigate the role of hydrogen induced blisters cracking on degradation of tensile and fatigue properties of X65 pipeline steel. Both tensile and fatigue specimens were electrochemically charged ...
Investigation into hydrogen-induced blister cracking and mechanical failure in pipeline steels

Singh, V.; Arora, K.S.; Mahajan, D.K. (2022-07-28)

This work aims to investigate the role of hydrogen-induced blisters on tensile and fatigue damage of pipeline steels (X65 and X80). The electrochemical method of hydrogen charging is employed to simulate hydrogen-induced ...
On the role of vacancy-hydrogen complexes on dislocation nucleation and propagation in metals

Arora, A.; Singh, H.; Adlakha, I.; Mahajan, D.K. (2024-05-06)

New insights are provided into the role of vacancy-hydrogen (VaH) complexes, compared to the hydrogen atoms alone, on hydrogen embrittlement of nickel. The effect of the concentration of hydrogen atoms and VaH complexes ...
On the transition of fracture toughness in metallic materials with thickness: An atomistic viewpoint

Singh, R.; Mahajan, D.K. (2020-03-13)

From thick to very thin specimens, fracture toughness of metallic materials peaks out before hitting much lower value compared to the constant plane strain fracture toughness value obtained using standard fracture mechanics ...
On the transition of short cracks into long fatigue cracks in reactor pressure vessel steels

Singh, R.; Singh, A.; Arora, A; Singh, P.K.; Mahajan, D.K. (2018-10-01)

Short fatigue cracks, having dimension less than 1 mm, propagate at much faster rates (da/dN) even at lower stress intensity factor range (da/dN) as compared to the threshold stress intensity factor range obtained from ...
Tracking hydrogen embrittlement using short fatigue crack behavior of metals

Singh, V.; Singh, R.; Singh, A.; Mahajan, D.K. (2019-05-20)

Understanding hydrogen embrittlement phenomenon that leads to deterioration of mechanical properties of metallic components is vital for applications involving hydrogen environment. Among these, understanding the influence ...

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