The influence of yttrium addition on thermogravimetric behaviour of new Co-10Al-5Mo-2Nb Co-based superalloy

• Autorzy: Moskal G. , Tomaszewska A. , Migas D. , Mikuszewski T. , Jasik A. , Maciąg T.

Identyfikatory

DOI

10.15199/40.2018.11.1

Warianty tytułu

PL

Wpływ itru na wyniki badań termograwimetrycznych nowego nadstopu kobaltu typu Co-10Al-5Mo-2Nb

• Języki publikacji: EN

Abstrakty

EN

Characterization of oxidation resistance of new type of cobalt based superalloys were presented in this investigations. As a referential material the Co-10Al-5Mo-2Nb (at.%) was used as the tungsten-free version of basic Co-7Al-7W alloy. The investigated alloy was modified by addition of yttrium on the level of 0.5 at.% due to expectation of improvement of it oxidation resistance. Both Co-based superalloys were casted in Institute of Materials Engineering of Silesian University of Technology in Poland. The oxidation performance of alloys were made during thermogravimetric investigations at temperature range from 25 to 1200°C. The main analyzed parameter was mass gain detected continuously during the test. After the test the overall and cross-sectional analysis of specimens was made. They included analysis of oxide layer morphology on the surface of specimens with characterization of phase constituent of oxide layer. The detailed analysis of oxidized layer was made by scanning electron microscopy method where distribution of alloying elements was made with special attentions on yttrium localization after the test in oxide zone. Obtained data showed that addition of Y has a strong influence on oxidation performance of new Co based superalloy. Those influence is demonstrated mainly by different morphology of final oxide zone with strong influence on Mo and Nb diffusion.

PL

Przedstawiono wyniki badań dotyczące odporności na utlenianie nowych nadstopów kobaltu. Jako materiału referencyjnego użyto stopu Co-10Al-5Mo-2Nb (at.%), który jest bez-wolframową wersją stopu Co- -7Al-7W. Analizie poddano stop z dodatkiem itru w ilości 0,5 % at., którego rolą była poprawa odporności na utlenianie. Wszystkie analizowane materiały wytworzono w Instytucie Inżynierii Materiałowej Politechniki Śląskiej. Zachowanie się stopów w warunkach utleniania oceniano podczas testów termograwimetrycznych w zakresie temperatury 25°C- -1200°C. Podstawowym analizowanym parametrem była zmiana masy próbek. Po zakończeniu testów wykonano badania na zgładach metalograficznych, obejmujące analizę morfologii warstwy tlenkowej na warstwie wierzchniej stopu oraz scharakteryzowano ich skład fazowy. Szczegółową analizę budowy warstwy utlenionej dokonano w trakcie badań na skaningowym mikroskopie elektronowym, gdzie dokonano oceny rozkładu składników stopowych ze szczególnym uwzględnieniem lokalizacji itru w strefie utlenionej. Uzyskane wyniki wykazały, że wprowadzenie itru ma silny wpływ na wyniki badań termograwimetrycznych nowych nadstopów kobaltu, co objawiało się różnicami w morfologii warstwy utlenionej oraz silnym wpływem itru na dyfuzję Mo i Nb.

Słowa kluczowe

EN

new type of cobalt based superalloys; Co-Al-Mo-Nb; yttrium influence

PL

nowe stopy kobaltu; stop Co-Al-Mo-Nb; wpływ itru

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Ochrona przed Korozją
• Rocznik: 2018
• Tom: nr 11
• Strony: 328--332
• Opis fizyczny: Bibliogr. 25 poz., rys., tab., wykr.

Twórcy

autor

Moskal G.

• Silesian University of Technology, Institute of Materials Engineering, 40-019 Katowice, ul. Krasińskiego 8, Poland

autor

Tomaszewska A.

• Silesian University of Technology, Institute of Materials Engineering, 40-019 Katowice, ul. Krasińskiego 8, Poland

autor

Migas D.

• Silesian University of Technology, Institute of Materials Engineering, 40-019 Katowice, ul. Krasińskiego 8, Poland

autor

Mikuszewski T.

• Silesian University of Technology, Institute of Materials Engineering, 40-019 Katowice, ul. Krasińskiego 8, Poland

autor

Jasik A.

• Silesian University of Technology, Institute of Materials Engineering, 40-019 Katowice, ul. Krasińskiego 8

autor

Maciąg T.

• Silesian University of Technology, Department of Extractive Metallurgy and Environmental protection, 40-019 Katowice, ul. Krasińskiego 8, Poland

Bibliografia

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Uwagi

This work was supported by the National Science Centre, Poland, under grant number 11/030/PBU17/0176.

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).