Heat treatment and CVD aluminizing of Ni-base René 80 superalloy

• Autorzy: Pytel M. , Góral M. , Nowotnik A. , Sieniawski J. , Drajewicz M. , Ziaja W.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This work presents the results of microstructure investigations which were carried out on Ni-base Rene 80 polycrystalline superalloy. Design/methodology/approach: Polycrystalline cast rods have been used in the studies. The heat treatment processes were conducted in ALD High Temperature Vacuum Furnace at 1204°C for 2 h, in Ar atmosphere followed by cooling to room temperature. The aluminizing processes were conducted by use of CVD method on as cast samples and after homogenizing-solution annealing. The diffusion low activity aluminide coatings have been produced using the CVD IonBond BPXPR0325S apparatus at various temperatures, for 4 h and applying different values of: flow rate of HCl through the outer AlCl3 generator and pressure in main retort in H2 atmosphere. The microstructure investigations were conducted using scanning electron microscope. To the purpose of analysis of the chemical composition an X-ray microanalysis technique was applied with the dispersion of the energy (EDS) using of Thermo and Noran equipment. Findings: It was found that samples without heat treatment had the typical cast microstructure with many areas of the y-y’ eutectic, after heat treatment process the microstructure was homogenized, i.e. the eutectic y-y’ has been dissolved, MC-type carbides were precipitated on the grain boundaries and the chemical composition was balanced. It was found also that after homogenizing heat treatment the samples had the thicker coating and had more homogenous additive and diffusion layer than the samples with as-cast microstructure. Research limitations/implications: Results will be used for further steps which will consist of CVD process and other different heat treatment. Practical implications: This CVD method will be used in the future for the production of modified aluminide bond coats on single crystal Ni-base superalloys underlying the ceramic EB-PVD or LPPS top coatings. Originality/value: In the future the production of chemical vapor deposited platinum (or Pd, Zr, Hf) aluminide diffusion coatings on nickel base superalloy substrate are planned.

Słowa kluczowe

EN

superalloys; heat treatment; CVD aluminizing; protective coatings; diffusion coatings

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2012
• Tom: Vol. 51, nr 1
• Strony: 30--38
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Pytel M.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Góral M.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Nowotnik A.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Sieniawski J.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Drajewicz M.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

autor

Ziaja W.

• Department of Materials Science, The Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

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