Lattice Misfit Measurement in Inconel 625 by X-Ray Diffraction Technique

Sarkar, A.; Mukherjee, P.; Barat, P.; Jayakumar, T.; Mahadevan, S.; Sanjay, K.

doi:10.1142/s0217979208048772

Cited by 27 publications

(5 citation statements)

References 15 publications

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“…On one hand, Inconel 625 forms coherent precipitates after heat treatment [15]. Sarkar et al [31] reported that these precipitates show diffracted peaks overlapping to the matrix. Especially the c 00 phase leads to a peak shape also found in the present study.…”

Section: In Situ Segregation Stagementioning

confidence: 99%

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

et al. 2021

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Laser powder bed fusion is an additive manufacturing process that employs highly focused laser radiation for selective melting of a metal powder bed. This process entails a complex heat flow and thermal management that results in characteristic, often highly textured microstructures, which lead to mechanical anisotropy. In this study, high-energy X-ray diffraction experiments were carried out to illuminate the formation and evolution of microstructural features during LPBF. The nickel-base alloy Inconel 625 was used for in situ experiments using a custom LPBF system designed for these investigations. The diffraction patterns yielded results regarding texture, lattice defects, recrystallization, and chemical segregation. A combination of high laser power and scanning speed results in a strong preferred crystallographic orientation, while low laser power and scanning speed showed no clear texture. The observation of a constant gauge volume revealed solid-state texture changes without remelting. They were related to in situ recrystallization processes caused by the repeated laser scanning. After recrystallization, the formation and growth of segregations were deduced from an increasing diffraction peak asymmetry and confirmed by ex situ scanning transmission electron microscopy. Graphical Abstract

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Section: In Situ Segregation Stagementioning

confidence: 99%

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

et al. 2021

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“…Wang et al [11] compared the interplanar spacings (dhkl) of 316 stainless steel with those of the Ni-based superalloy 182, and obtained a mismatch of 16% which together with the residual strains ( Figure 14) increased the number of dislocations in the PGS zone and, consequently, its hardness. Based on these considerations, it is believed that the PGS zone of 9%Ni steel cladded with Ni-based superalloy 625 displays similar behavior because of the deformation of this zone during the welding (Figure 14) and the difference in dhkl between these materials, which was about 21% [60]. During the welding of the 2nd L C II, the PGS zone was reheated, which could aid its recovery, thereby softening it.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

Farias

Filho

Azevedo

2018

Metals

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9%Ni steel was recently used for the first time in the field of injection unit (IU) for the injection of CO2 into oil wells. Because such steels are operated in H2S medium and are susceptible to sulfide stress cracking, their pipes are cladded with Ni-based superalloy 625 by using gas tungsten arc welding with a hot wire to prevent this phenomenon from occurring. The transition zone of substrate/clad can have high hardness and low toughness, and promote failure of the component during service; therefore, it is very important to know its characteristics. In this work, this transition zone was analyzed through optical and scanning electron microscopy with energy dispersive X-ray spectrometry and electron backscatter diffraction, as well as Vickers microhardness, shear and bend tests. Metallographic analysis identified type I and II boundaries with distinct chemical gradients, MC-type carbides, Laves/γ eutectics, peninsulas macrosegregation, crystallographic texture close to <100> in the clads, residual strain, and drop of microhardness across the transition zone. The clads were approved in the shear and bend tests. This work proposes a new type II boundary formation mechanism in dissimilar welds of steels that do not exhibit the allotropic transformation δ → γ during the welding thermal cycle and do not experience a change in the solidification mode.

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“…Thermal aging occurs when a metal is held at a consistent temperature for a long duration, and the increased temperature enables the rearrangement of atoms within the lattice. Within nickel-based alloys precipitates often form as a result of thermal aging [184,164].…”

Section: Evolution Of Microstructure Under Irradiationmentioning

confidence: 99%

“…Thermally aged defects, such as long range ordered precipitates that occur in nickel-based alloys [164,89], also act as barriers to glide dislocation motion. Often these defects are modeled with either the the dispersed barrier hardening model introduced for FCC irradiation defects or as antiphase boundary sheared particles [89].…”

Section: Strengthening Due To Irradiation and Thermal Agingmentioning

confidence: 99%

“…The use of nickel alloys for piping materials in chemical industry processing plants over decades provides a set of information on the in operation aging of commercial nickel alloys. Several studies have analysized the microstructure of nickel-based alloys after 50,000 hrs to 70,000 hrs of in service operation at temperatures of 450 o C to 600 o C [184,175,164,193,123]. Among the several precipitates and particles which form in these complex alloys is the formation of long ranged ordered (LRO) Ni 2 Cr precipitates [112].…”

Section: Thermal Aging Defect Evolution In Fcc Metalsmentioning

confidence: 99%

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Modeling and Simulation of Microstructure Evolution and Deformation in an Irradiated Environment

Pitts

2019

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Values of the dislocation evolution parameters used in the thin beambending simulations to compare the approaches of calculating the plastic velocity gradient derivative. These parameters, for the CDD dislocation evolution model, Eq (2.67) and Eq (2.68), are appropriate for an FCC material and are slight modified from the values determined by [177] for nickel based on fitting conducted as supplemental

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Lattice Misfit Measurement in Inconel 625 by X-Ray Diffraction Technique

Cited by 27 publications

References 15 publications

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

Modeling and Simulation of Microstructure Evolution and Deformation in an Irradiated Environment

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