Investigation into the influence of post-weld heat treatment on the microstructure and hardness of Inconel X-750

Peasura, Prachya; Poopat, Bovornchok

doi:10.1177/1687814015578396

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…Chromium carbides (Cr 23 C 6 ) were coincident with γ at 44º for sintering temperatures between 1068 and 1150 ºC. The amount of Cr 23 C 6 tend to decrease with the increase of temperature once this phase due its dissolution into the matrix [19]. Niobium (Nb) is an element of Inconel 718 alloy which is highly predisposed to segregation, and consequently form precipitates.…”

Section: Densi Cation and Physical Propertiesmentioning

confidence: 99%

“…XRD spectrum revealed the precipitation of chromium carbides ( Cr 23 C 6 ) at 1068ºC sintering temperature but its dissolution at T1150P60 condition. Knowing that carbides enhance the hardness results, the decrease of the amount of Cr 23 C 6 with temperature may are responsible for the decrease on hardness from 292.00 ± 0.00 to 283.90 ± 9.10 HV when considering 60 MPa as pressure sintering [19].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Influence of the temperature and pressure on densification, physical and mechanical properties of Inconel 718 produced by Hot Pressing

Marques

Cunha²,

Silva³

et al. 2022

Preprint

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This work aims to study the influence of hot-pressing (HP) sintering conditions (temperature and pressure) on Inconel 718 (Inc718) powders densification, microstructural, fracture mode and hardness properties. The sintering conditions included temperatures of 1000, 1068 and 1150 ºC and pressures of 50 and 60 MPa for a dwell time of 60 min. Fracture mode and the grain morphology were assessed by scanning electron microscopy (SEM). The grain size (GS) of the compacts increased with increasing HPed temperature and the fracture mode changed from intergranular dominant fracture to fully dimple ductile fracture. The microstructure features were characterized by X-ray diffraction (XRD) analysis. The results showed that intermetallic precipitate originated from the Inconel 718 powders were retained in the sintered specimens considered. The chromium Carbides ( ) were formed at 1068ºC but were eliminated when HPed at and above 1150ºC and 60 MPa once they tend to dissolve when increasing temperature. The hardness results revealed that the sintering Inconel 718 powders at 1000 ºC is not enough to promote the proper densification and so the optimum hardness results. For higher temperature (1068 and 1150 ºC) the hardness results decrease from 292 to 283 HV with increasing HP temperature (for 60 MPa) due to the dissolution of chromium carbides ( ). The pressure conditions also influenced powder’s sintering but did not reveal a pronounced difference in densification and hardness results. Further investigations must consider a wide range of pressure values as well a deeply study on the microstructure features on particle grain boundaries.

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Section: Densi Cation and Physical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Influence of the temperature and pressure on densification, physical and mechanical properties of Inconel 718 produced by Hot Pressing

Marques

Cunha²,

Silva³

et al. 2022

Preprint

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“…The GTA weldments show the presence of MoNi 4 , M 6 C, and M 3 C phases. 36,40 The segregation of Mo (Figure 8) at the last stage of the solidification primes to the development of these phases in the GTA weldment. In the case of PCGTA, NiCrCoMo phase is observed.…”

Section: Xrd Analysismentioning

confidence: 99%

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Munusamy

Manikandan

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

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“…In general, post-weld heat treatment (PWHT) must be carried out in the precipitation-strengthened nickel-based superalloy to improve the properties of the weldments [13][14][15]. Solid-solution-strengthened alloys also require PWHT to minimize the segregation (as a result of solidification in the fusion zone, during welding) in order to maintain the solid solution strengthening effect in the fusion zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

et al. 2019

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This work examines the influence of post-weld heat treatment (PWHT) on the fusion zone microstructure, and mechanical properties of electron beam (EB)-welded alloy 686. Comparative studies have been made on weld microstructure and tensile properties of the weldments both in as-welded and post-welded heat-treated conditions. PWHT consists of direct aging (DA/480°C for 3 h) and solution treatment (ST, 980°C for 1 h) followed by ageing and finally, homogenizing treatment (HT, 1200°C for 1 h) followed by DA and ST. The secondary topologically closed packed (TCP) phases formation, their distribution and microsegregation characteristics are studied with the aid of scanning electron microscope (SEM) analysis. Energy-dispersive X-ray spectroscopy (EDS) is also performed to estimate the microsegregation of alloying elements in the dendritic core and interdendritic regions of the weldments. The result shows that there is no significant change in the microstructure of DA and solution-treated sample as compared to the as-welded sample. The microstructure of HT sample was entirely different from those of as-welded and other HT samples. The SEM/EDS analysis illustrates the presence of secondary TCP phases (r, P and l) in the as-weld, DA and ST condition, whereas HT weldments did not show the presence of TCP phases. Tensile test results show higher tensile strength in ST condition whereas homogenization samples show higher ductility compared with others.

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Investigation into the influence of post-weld heat treatment on the microstructure and hardness of Inconel X-750

Cited by 11 publications

References 14 publications

Influence of the temperature and pressure on densification, physical and mechanical properties of Inconel 718 produced by Hot Pressing

Influence of the temperature and pressure on densification, physical and mechanical properties of Inconel 718 produced by Hot Pressing

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Effect of post-weld heat treatment on the microstructure and tensile properties of electron-beam-welded 21st century nickel-based super alloy 686

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