Effect of process parameters on double pulse metal inert gas welded joints of Inconel 718 superalloy

Shantharaj, M.; Rajasekaran, T.; Pandey, Chandan

doi:10.1007/s40194-023-01559-7

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Constitutional supercooling primarily dictates the presence of columnar grains. 43 Owing to the increase in HI, the grain size in FZ increases which is shown in Supplementary Figure 11. The grain size increased to 38.46% with an 8.89 J/mm increase of HI.…”

Section: Resultsmentioning

confidence: 93%

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Manoj Samson,

Deepan Bharathi Kannan,

Shravan Kumar

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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This research aims to analyze the welding of 1 mm thick NiTinol sheets using an autogenous double pulse tungsten inert gas (DPTIG) welding process. The effect of heat input (HI) on bead geometry, microstructure, hardness, tensile strength, phase transformation temperature (PTT), and corrosion behavior was studied. The lower (111.25 J/mm), and higher (120.14 J/mm) HI produced an average grain size of 26 μm and 36 μm, respectively. The microstructure of the fusion zone (FZ) had coarser columnar grains with intermetallic phases such as Ni3Ti, and TiO2. The grain size in the FZ increased with the increase in HI. Sample P (111.25 J/mm) showed a higher hardness of 280.54 HV and tensile strength of 566 MPa due to a higher proportion of austenite phase (99.4%), the smaller grain size of 26 µm, a larger fraction of high angle grain boundary (HAGB) of 75.8%, and higher kernel average misorientation (KAM) value of 4.93. Compared to base metal (BM), sample P (111.25 J/mm), and sample S (120.14 J/mm) exhibited a reduction in tensile strength of 19.14% and 32.29%, respectively. The decline in hardness and tensile strength was attributed to the formation of intermetallic phases, a decrease in the Ti/Ni ratio, coarser grain formation, and a decrease in HAGB fraction and KAM values. The fractured tensile samples showed a mixed mode of fracture with dimples and cleavage facets. Compared to BM, Sample Q (118.05 J/mm) exhibited lesser variation in temperature hysteresis values for austenite and martensite temperatures, with a deviation of 0.4°C and 3.1°C, respectively. All the welded samples had better corrosion behavior than the BM due to a higher Ti/Ni ratio.

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Section: Resultsmentioning

confidence: 93%

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Manoj Samson,

Deepan Bharathi Kannan,

Shravan Kumar

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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Exploring the Microstructural and Mechanical Properties of Next-Generation Super Alloys

Abhishek,

Babu,

Arora

et al. 2023

E3S Web Conf.

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The utilisation of next-generation superalloys is of utmost significance in the progression of contemporary engineering applications that necessitate extraordinary mechanical strength, stability at elevated temperatures, and resistance to corrosion. The present work aims to conduct a thorough investigation of the microstructural and mechanical properties of these advanced materials, providing insights into their distinct features and possible areas of application. The examination of microstructure involves the utilisation of several methodologies, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The present study comprehensively examines the complicated grain structures, phase compositions, and distribution of strengthening precipitates inside the superalloys using various methodologies. The correlation between processing factors and resultant microstructures is established, facilitating a more profound comprehension of the influence of microstructure on the mechanical properties of the alloy. The knowledge acquired from this investigation into the microstructural and mechanical characteristics of next-generation superalloys provides useful insights for engineers, researchers, and designers engaged in materials development and component design. Through the use of a comprehensive comprehension of the distinctive properties of these alloys, it becomes feasible to expand the limits of performance in exceedingly challenging conditions, so influencing the trajectory of high-temperature engineering applications in the future.

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Investigation of Single and Double Pulse Techniques on Microstructure and Mechanical Anisotropy of Inconel 686 Component Fabricated by Wire Arc Directed Energy Deposition

Balasubramanian

2024

Preprint

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Effect of process parameters on double pulse metal inert gas welded joints of Inconel 718 superalloy

Cited by 3 publications

References 22 publications

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Exploring the Microstructural and Mechanical Properties of Next-Generation Super Alloys

Investigation of Single and Double Pulse Techniques on Microstructure and Mechanical Anisotropy of Inconel 686 Component Fabricated by Wire Arc Directed Energy Deposition

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