Analysis of Phase Transformations in Inconel 625 Alloy during Annealing

Petrzak, Paweł; Kowalski, Kazimierz; Blicharski, M.

doi:10.12693/aphyspola.130.1041

Cited by 52 publications

(27 citation statements)

References 13 publications

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“…Mikrostruktura strefy wpływu ciepła (SWC) charakteryzowała się dużym zróżnicowaniem i uzależniona była od temperatury w danym obszarze strefy. Na podstawie obserwacji i wcześniejszych badań stwierdzono bainityczny charakter mikrostruktury [9,14,16]. Grubość napawanych powłok wynosiła od 2,5 do 3,0 mm.…”

Section: Wyniki I Ich Dyskusjaunclassified

“…Pierwszy typ to wydzielenia wydłużone i owalne, wzbogacone w Nb, Mo oraz Cr. Na podstawie analizy składu chemicznego i dostępnej literatury[9,10,14,17,18] zostały zidentyfikowane jako prawdopodobnie fazy TCP. Drugim typem wydzieleń są wydzielenia o kanciastym kształcie, które zidentyfikowano jako węgliki typu MC, które może tworzyć Nb oraz węgliki typu M23C6, które mogą powstawać przy udziale Cr, Mo i W.Powyższe zależności potwierdzają pomiary liniowe składu chemicznego pierwiastków.…”

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Mikrostruktura i skład chemiczny powłok ze stopów Inconel 625 i 686 napawanych metodą CMT na stali 16Mo3

Petrzak¹,

Kowalski²,

Rozmus-Górnikowska³

2017

Przegląd Spawalnictwa

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StreszczenieW artykule zaprezentowano wyniki badań mikrostruktury, składu chemicznego i właściwości mechanicznych napoin ze stopów Inconel 625 i 686 (NiCr22Mo9Nb i NiCr21Mo16W) nanoszonych na rury ze stali 16Mo3. Napoiny wykonano metodą Cold Metal Transfer (CMT). Badania przeprowadzono z wykorzystaniem mikroskopii świetlnej (LM), skaningowej (SEM) i transmisyjnej (TEM). Próbki poddano jakościowej i ilościowej analizie składu chemicznego techniką EDS. Dokonano oceny mikrosegregacji pierwiastków stopowych następującej podczas krzepnięcia napoiny. Dodatkowo wykonano pomiary twardości metodą Vickersa. AbstractThe paper presents results of the investigation of the microstructure, chemical composition and mechanical properties of Inconel 625 and 686 (NiCr22Mo9Nb and NiCr21Mo16W) weld overlays deposited on 16Mo3 steel. The weld overlays were made by Cold Metal Transfer (CMT) technique. Investigation were carried out using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The samples were subjected to quantitative and qualitative chemical composition analysis with use of EDS. An evaluation of microsegregation of alloy elements during solidification of the weld overlay was performed. The investigation was supplemented by the hardness measurements (Vickers method).

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Section: Wyniki I Ich Dyskusjaunclassified

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Mikrostruktura i skład chemiczny powłok ze stopów Inconel 625 i 686 napawanych metodą CMT na stali 16Mo3

Petrzak¹,

Kowalski²,

Rozmus-Górnikowska³

2017

Przegląd Spawalnictwa

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“…The second important aspect that has to be taken into consideration is the fact that exposing of Inconel alloys to the long-term annealing process may have consequences in the formation of precipitates in their microstructure (e.g. carbides, γ" and δ phases) [34][35][36][37]. Although, the classic heat treatments of the clad-plates are not long enough to cause the precipitation processes in Inconel alloys, the severe plastic deformation which affects the material in the joint area influence the kinetic of precipitating significantly promotes quicker formation of precipitates [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Post-Weld Heat Treatment on the Microstructure of Inconel 625/Carbon Steel Bimetal Joint Obtained by Explosive Welding

Kosturek

Wachowski

Śnieżek

et al. 2019

Metals

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Inconel 625 and steel P355NH were bonded by explosive welding in this study. Explosively welded bimetal clad-plate was subjected to the two separated post-weld heat treatment processes: stress relief annealing (at 620 °C for 90 min) and normalizing (at 910 °C for 30 min). Effect of heat treatments on the microstructure of the joint has been evaluated using light and scanning electron microscopy, EDS analysis techniques, and microhardness tests, respectively. It has been stated that stress relief annealing leads to partial recrystallization of steel P355NH microstructure in the joint zone. At the same time, normalizing caused not only the recrystallization of both materials, but also the formation of a diffusion zone and precipitates in Inconel 625. The precipitates in Inconel 625 have been identified as two types of carbides: chromium-rich M23C6 and molybdenum-rich M6C. It has been reported that diffusion of alloying elements into steel P355NH takes place along grain boundaries with additional formation of voids. Scanning transmission electron microscope observation of the grain microstructure in the diffusion zone shows that this area consists of equiaxed grains (at the side of Inconel 625 alloy) and columnar grains (at the side of steel P355NH).

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“…Additionally, Inconel alloys display a tendency to form precipitates (e.g. carbides, γ′, γ″ and δ phases) upon long-term exposure to high temperature [34][35][36][37]. Importantly, plastic deformation of Inconel alloys exerts a considerable impact on the kinetics of precipitate formation, as it promotes their quicker development [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

The effects of the heat treatment on the microstructure of Inconel 625/steel bimetal joint obtained by explosive welding

et al. 2018

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In this investigation steel P355NH was successfully clad with Inconel 625 through the method of explosive welding. Explosively welded bimetal was subjected to the two separated heat treatment processes: stress relief annealing (at 620oC for 90 minutes) and normalizing (at 910oC for 30 minutes). In order to identify the microstructure of the joint and to investigate the influence of the heat treatment on it, the light and scanning electron microscope observations and microhardness analysis have been performed. In order to investigate the diffusion zone microstructure the scanning transmission electron microscope observation have been performed. It was stated that obtained joint has characteristic wavy-shape geometry with the presence of the melted zones and severe deformed grains of both joined materials. Strengthening of materials in joint zone was established with microhardness analysis. In both of the heat treatments the changes in the grain structure have been observed. The normalizing heat treatment has the most significant impact on the microstructure of the joint as well as the concentration of the chemical elements in the joint zone. It was reported that due to normalizing the diffusion zone has been formed together with precipitates in the joint zone.

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Analysis of Phase Transformations in Inconel 625 Alloy during Annealing

Cited by 52 publications

References 13 publications

Mikrostruktura i skład chemiczny powłok ze stopów Inconel 625 i 686 napawanych metodą CMT na stali 16Mo3

Mikrostruktura i skład chemiczny powłok ze stopów Inconel 625 i 686 napawanych metodą CMT na stali 16Mo3

The Influence of the Post-Weld Heat Treatment on the Microstructure of Inconel 625/Carbon Steel Bimetal Joint Obtained by Explosive Welding

The effects of the heat treatment on the microstructure of Inconel 625/steel bimetal joint obtained by explosive welding

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