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Microstructure, Chemical and Phase Composition of Clad Layers of Inconel 625 and Inconel 686

Solecka M., Kopia A., Petrzak P., Radziszewska A.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 1

513--518

EN

The article presents the investigation results of microstructural, chemical composition changes after clad layers of Inconel 625 and Inconel 686 alloys weld overlaid on boiler tubes. The boiler tubes made of 16Mo3 steel were cladded in the Boiler Factory SEFAKO S.A. using CMT technique. The microstructure and chemical composition of coatings were analysed using light microscopy, scanning and transmission electron microscopy. The value of the partition coefficient k was determined for Inconel 625 and Inconel 686 clad layers. The value was calculated by dividing the average content (% wt.) of Ni, Cr, Mo, Fe, Nb and W.

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

Petrzak P., Kowalski K., Rozmus-Górnikowska M.

Przegląd Spawalnictwa

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2017

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R. 89, nr 6

24--29

PL

W 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.

EN

The 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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Investigation of Ni-base coatings after corrosion test

Solecka M., Radziszewska A., Kopia A., Rozmus-Górnikowska M., Kusiński J.

Inżynieria Materiałowa

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2016

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Vol. 37, nr 4

190--195

EN

Inconel 625 and 686 are Ni–Cr–Mo alloys used for its high strength, outstanding corrosion resistance, and excellent fabricability. For this reason, these alloys are typically used as a one of the most important coating material and can be applied to chemical and petrochemical plants, power generation sector, heat exchanger tubing for boilers of waste incinerators. To perform the Ni-base weld overlays, without introducing too much Fe, a new weld technique called Cold Metal Transfer (CMT) was used. This paper presents the mechanisms of high-temperature corrosion, microstructure and chemical composition of boiler elements after the waste incineration form ashes at 650°C from 500 h. Microstructure examinations of the Inconel 625 and Inconel 686 corroded surface were carried out by scanning electron microscopy (SEM) supported by energy dispersive spectroscopy (EDS). The phase compositions of the corroded surfaces were carried out by means of X-ray diffraction.

PL

Celem pracy jest analiza mikrostruktury, składu fazowego oraz chemicznego napoin ze stopów Inconel 625 i Inconel 686 po wysokotemperaturowym utlenianiu w temperaturze 650°C przez 500 h w popiołach pochodzących ze spalarni odpadów.