Electron detection modes comparison for quantification of secondary phases of Inconel 686 weld metal

Miná, Émerson Mendonça; Silva, Yuri Cruz da; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Dille, Jean; Silva, Cleiton Carvalho

doi:10.1016/j.matchar.2017.09.014

Cited by 16 publications

(6 citation statements)

References 37 publications

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“…Then, they were electrolitically etched with 10% HO 2 CCO 2 H solution, 20% HNO 3 solution (20%), and observed in the light optical microscope. Another set of specimens in as-polished condition were evaluated by scanning electron microscopy (SEM) in the backscattered electron (BSE) mode to produce the Zcontrast effect, which is very helpful to identification of secondary phases [17]. Based on these micrographs taken from SEM, a quantitative evaluation by image analysis was performed using a software which permits to segment and quantify the phases easily by neural network [18].…”

Section: Methodsmentioning

confidence: 99%

“…The results allowed the identification of three distinct regions, considering their differences in brightness intensity. These differences of intensity are associated to the BSE emission capacity of each phase, due to the differences in the concentration of chemical elements with high atomic number (Z contrast) [17]. Therefore, the darker regions correspond to those with the lowest concentration of heavy elements, for example Mo, while the zones with the strongest brightness correspond to those enriched in Mo, whose backscattered electron emission capacity increases considerably.…”

Section: Weldments After Aging Thermal Treatmentmentioning

confidence: 99%

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Influence of the heat input and aging treatment on microstructure and mechanical properties of AISI 317 L steel weldments using 0020 robotic–pulsed GMAW

Antunes

Silva

Corrêa

et al. 2019

Int J Adv Manuf Technol

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In this work, the effect of heat input and aging treatment on the microstructural characteristics and mechanical properties of similar AISI 317L austenitic stainless steel weldments used in the petroleum industry was investigated. The filler metal used was the AWS ER317L electrode at two different heat input levels (4 and 8 kJ/cm) in order to verify the influence of this parameter on the precipitation of deleterious phases. The specimens were aged at 700 °C for 50 and 100 h. Quantification and microchemical mapping of precipitated phases after welding and aging thermal treatment (ATT) were performed. Vickers hardness and tensile tests were used to evaluate the mechanical properties. It was observed that aging promoted a refinement of the base metal region, and all delta ferrite was transformed into sigma phase. The delta ferrite present in the fusion zone was completely transformed into sigma and chi phases. In the aged specimens for 100 h a lower occurrence of the secondary austenite phase (γ2) was identified, which indicates that with the increase of ATT time the dissolution of γ2 occurred in the already precipitated sigma phase. All welding conditions showed an increase in tensile strength, yield limit and hardness with the ATT.

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Section: Methodsmentioning

confidence: 99%

Section: Weldments After Aging Thermal Treatmentmentioning

confidence: 99%

Influence of the heat input and aging treatment on microstructure and mechanical properties of AISI 317 L steel weldments using 0020 robotic–pulsed GMAW

Antunes

Silva

Corrêa

et al. 2019

Int J Adv Manuf Technol

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“…these studies have shown presence of (Nb, ti)c in the clad layers matrix of γ phase. Moreover, precipitates of other phases (Laves, P and σ) were observed [22,25]. Chemical composition analysis revealed the microsegregtion of Mo, cr and fe into the cellular-dendritic microstructure of inconel 686 clad layers.…”

Section: Resultsmentioning

confidence: 97%

“…the microstructure and characteristics of inconel 686 alloy clad layer have been examined and discussed elsewhere [22,[24][25][26]. these studies have shown presence of (Nb, ti)c in the clad layers matrix of γ phase.…”

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Solecka

Rutkowski

Kopia

2021

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Kinetics of the high temperature oxidation of the inconel 686 coatings in the Waste incineration ash in this paper, detailed characterization of the oxide scale, grown on the inconel 686 coating after high-temperature oxidation at 650°c in ashes from waste incineration power plant was performed. phase composition, morphology, microstructure and chemical composition of the oxide scale were investigated using XRD and SeM analysis. Mechanisms of formation and growth of oxide scales were examined, resulting in the insights into oxidation kinetics. Results revealed presence of Nio in the outermost layer of the oxide scale. at the bottom of oxide scale, crNi 2 o 4 spinel layers were formed due to the increasing concentration of cr. in the middle area of oxide scale, due to higher concentration of cr and lower amount of Ni, the cr 2 Nio 4 spinel is formed. the innermost layer was composed of cr 2 o 3 .

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“…In order to obtain a quantitative analysis of the ferrite content, a quantification of the phases present in the fusion zone and their average chemical composition were performed. For that, 50 images of each welding condition were recorded, and later, they were submitted to analysis using the SVRNA System software 15 . For comparative analysis, 50 measurements of the ferrite amount present in the FZ were also carried out for each welding condition using a ferritoscope.…”

Section: Methodsmentioning

confidence: 99%

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

2022

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The present work investigated the influence of heat input and aging time on the microstructural characteristics and the mechanical properties of dissimilar AISI 317L austenitic stainless steel welded joints. The AWS ER2209 wire-electrode was used as filler metal, and two different heat input levels were applied (4 and 8 kJ/cm), aiming to verify the influence of this parameter on the deleterious phases precipitation. An aging heat treatment (AHT) was carried out at 700 °C for two different exposure times: 50 and 100 hours. It was observed that aging promoted a refinement of the base metal region, and all delta ferrite was transformed into the sigma phase. The microstructure of the fusion zone (without AHT) presented a significant amount of austenite that precipitated in three different morphologies: allotriomorphific of grain boundary, Widmanstätten, and intragranular. For all the thermally treated samples, it was possible to identify the presence of the σ and χ phases. Additionally, the highest concentration of the χ phase was identified in the samples submitted to 50 hours of AHT. The welding condition and AHT that presented joints with higher mechanical resistance and remarkable toughness were those welded with 4 kJ/cm heat input and with 100 hours of AHT. All welded joints showed an increase in the hardness profile after AHT. The microhardness values showed a good correlation with the microstructure and the mechanical tests so that the highest values of microhardness were observed in welded joints with heat input of 4 kJ/cm and 100 hours of AHT

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Electron detection modes comparison for quantification of secondary phases of Inconel 686 weld metal

Cited by 16 publications

References 37 publications

Influence of the heat input and aging treatment on microstructure and mechanical properties of AISI 317 L steel weldments using 0020 robotic–pulsed GMAW

Influence of the heat input and aging treatment on microstructure and mechanical properties of AISI 317 L steel weldments using 0020 robotic–pulsed GMAW

Archives of Metallurgy and Materials

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

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