Phase evolution of surface-modified Incoloy 825 superalloy using pack aluminization

Sirichai Leelachao; Vimut Thongsiri; Patama Visuttipitukul

doi:10.3139/120.111390

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Phase evolution of surface-modified Incoloy 825 superalloy using pack aluminization

Sirichai Leelachao , Vimut Thongsiri und Patama Visuttipitukul

Veröffentlicht/Copyright: 30. August 2019

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Abstract

The objective of the study is to investigate the phase evolution of the aluminized surface of iron-concentrated nickel-based superalloys. Aluminization is carried out via pack cementation at constant temperature of 900 °C at three processing times of 1, 2.25 and 4 h. Backscattered images and X-ray diffractions are used for phase identification. Small incident angle X-ray diffraction applied on the surface and subjected to repetitive polishing elucidate a formation sequence of iron aluminides. The overall thickness of the aluminized layers is proportional to the processing time squared. The samples are composed of 4 zones, identified by elemental concentration profiles. Only iron aluminides are observed which is in agreement with thermodynamic- and atomic diffusion. The results conclude that aluminization on alloys is similar to oxidation and that nickel aluminide forms with great difficulty on the surface of an aluminized Incoloy 825 alloy.

∗Correspondence Address, Sirichai Leelachao, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Rd., Wangmai, Pathumwan, Bangkok 10330, Thailand, E-mail: sirichai.l@chula.ac.th, sirichai.lee@gmail.com

Sirichai Leelachao (D. Eng.), born in 1987, is currently a lecturer in the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand. His expertise includes triboluminescent materials, diffusion coatings and thin film processing.

Vimut Thongsiri (M. Eng., born in 1990, is currently working at Jibuhin Co., Ltd., located in Amata Nakorn Industrial Estate, Chonburi, Thailand. His Master's thesis focused on the aluminizing of nickel-based superalloys.

Associate Professor Patama Visuttipitukul (Ph.D.), born on 1977, is a lecturer in the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand. Her expertise mainly deals with surface coatings using physical vapor deposition techniques and surface modification of alloys involving plasma processing.

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Published Online: 2019-08-30

Published in Print: 2019-08-30

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https://doi.org/10.3139/120.111390