Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Munusamy, Sathishkumar; Manikandan, M.

doi:10.1177/0954408920988430

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…The relationship between the grain size and FWHM is given by Scherrers equation. 28,29 Where, d- average grain size, k - dimensionless factor (0.94), λ - X-ray wavelength, β - FWHM, θ - diffraction angle. From the Scherrer equation it can be inferred that the grain size is inversely proportional to FWHM.…”

Section: Resultsmentioning

confidence: 99%

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Jose

Manoharan

Natarajan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Residual stresses are inherent stresses that exist in engineering components even though no external load is applied. They are caused by the non-uniform volumetric shift of the metallic component during manufacturing processes. Welding is a key manufacturing technique that has a substantial impact on the economy since it is required for the production of a diverse variety of products used in the engineering sector. The residual stress primarily affects the stability, durability and performance of the welded joints. Hence its determination is of utmost importance. X-ray diffraction (XRD) is the most commonly used method for residual stress analysis. There are mainly two approaches for measuring residual stress using XRD; one is the sin2ψ method and the other is the cosα method. The residual stress measurements using the cosα method are handy, quick and convenient compared to the sin2ψ method. This method is well suited for welded joints, as it provides flexibility for testing immediately after the welding operation. Apart from residual stress measurements, the cosα method also gives valuable insights in the form of Debye-Scherrer (DS) rings and full width at half maximum. The present study focuses on the development of a novel technique that not only enables residual stress measurement but also provides a quantitative estimation of hardness and qualitative estimation of grain size without performing metallurgical or mechanical characterization. The material used for the present study is an arc-welded joint of MDN 250 grade maraging steel. The residual stress results show a compressive profile throughout the weldment, with a maximum value of compressive residual stress of 428 MPa at the fusion zone.

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Section: Resultsmentioning

confidence: 99%

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Jose

Manoharan

Natarajan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The hot corrosion behaviour of all the substrates was analysed through XRD and SEM/EDS testing. [25][26][27]…”

Section: Hot Corrosion Experimentsmentioning

confidence: 99%

Development of protective coating for X8CrNiMoVNb16-13 alloy in high-temperature molten salt environment through high-velocity oxy-fuel sprayed NiCrMoNb and Cr₃C₂-25NiCr powder coating

Sreenivasulu¹,

Subramani

Jayakumar

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Various industries extensively use the high-velocity oxy-fuel coating technique due to its superior quality, cost-effectiveness, flexibility and convenience for use. The present research distinguishes the high-temperature corrosion characteristics of high-velocity oxy-fuel coated NiCrMoNb and Cr3C2-25NiCr powder on X8CrNiMoVNb16-13 alloy. The oxidation and hot corrosion characteristics of X8CrNiMoVNb16-13 alloy were evaluated through the air and molten salt condition (60% V2O5 + 40% Na2SO4) for 50 cycles at a temperature of 900°C. Thermogravimetric measurement was performed to evaluate the weight gain square of coated and uncoated substrates. Vickers hardness, thickness, porosity and microstructure of the coating were analysed. The metallurgical integrity of the corrosion product is evaluated through scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) analysis. The laminar structure was observed in the coated region. Also, the dense microstructure with maximum porosity of 0.66% was observed, and the thickness of both the coatings was similar. The Cr3C2-25NiCr coating (766 ± 11 HV0.3) showed higher Vickers hardness than NiCrMoNb (377 ± 10 HV0.3). The occurrence of Cr2O3, NiFe2O4 and NiCr2O4 increased the corrosion resistance in both molten salts and air oxidation environments. The development of Fe2O3 in NiCrMoNb coating increases the weight gain when exposed to the molten salt condition. The present research recommended that Cr3C2-25NiCr coating can be used for the molten salt condition, whereas NiCrMoNb can be used for air oxidation application.

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Technology Development for Thick Section of Aerospace-Grade MDN 250 Weldment with Higher Weld Strength and Toughness by Suppressing Reverted Austenite Phase

Jose

Manoharan

Natarajan

2021

J. of Materi Eng and Perform

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Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Cited by 7 publications

References 39 publications

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Development of protective coating for X8CrNiMoVNb16-13 alloy in high-temperature molten salt environment through high-velocity oxy-fuel sprayed NiCrMoNb and Cr₃C₂-25NiCr powder coating

Technology Development for Thick Section of Aerospace-Grade MDN 250 Weldment with Higher Weld Strength and Toughness by Suppressing Reverted Austenite Phase

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Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Cited by 7 publications

References 39 publications

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Technology development for in-situ measurement of residual stress in arc welded joints of MDN 250 by portable Cosα X-ray diffraction method

Development of protective coating for X8CrNiMoVNb16-13 alloy in high-temperature molten salt environment through high-velocity oxy-fuel sprayed NiCrMoNb and Cr3C2-25NiCr powder coating

Technology Development for Thick Section of Aerospace-Grade MDN 250 Weldment with Higher Weld Strength and Toughness by Suppressing Reverted Austenite Phase

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Development of protective coating for X8CrNiMoVNb16-13 alloy in high-temperature molten salt environment through high-velocity oxy-fuel sprayed NiCrMoNb and Cr₃C₂-25NiCr powder coating