Precipitation of carbides in a nickel-based cast heat-resistant alloy during thermal exposure: evolution of microstructure, hardness and corrosion properties

Kubilay Öztürk; Alptekin Kısasöz; Gökhan Özer; Ahmet Karaaslan

doi:10.1515/mt-2022-0243

Article

Precipitation of carbides in a nickel-based cast heat-resistant alloy during thermal exposure: evolution of microstructure, hardness and corrosion properties

Kubilay Öztürk
Kubilay Öztürk graduated with MSc degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey. He is working as an engineer at TOFAS company. His main research areas are composite materials and heat treatment.
, Alptekin Kısasöz
Dr. Alptekin Kısasöz, graduated with PhD degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey in 2015. He is working as an associate professor at Yildiz Technical University in the Department of Metallurgical and Materials Engineering. His main research areas are physical metallurgy and welding metallurgy.
, Gökhan Özer
Dr. Gökhan Özer graduated with PhD degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey. He is working as an assistant professor at Fatih Sultan Mehmet Vakif University. His main research areas are the corrosion properties of non-ferrous alloys.
and Ahmet Karaaslan
Dr. Ahmet Karaaslan graduated with PhD degree in Metallurgical and Materials Engineering Montanuniversität Leoben. He is working at Gedik Company as a Welding Director. His main research areas are physical metallurgy and welding metallurgy.

Published/Copyright: February 3, 2023

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From the journal Materials Testing Volume 65 Issue 2

Abstract

Ni-based G-NiCr28W alloy, which is widely preferred in high-temperature applications, has an austenite matrix as well as carbides dispersed in the structure. The morphology of the carbides in the structure varies depending on the chemical composition and heat treatment. Carbide phases commonly seen in these alloys are MC, M₇C₃, and M₂₃C₆. These carbides can transform into each other and the mechanical properties of the alloy can be affected by the carbide transformation. In this study, the effects of the carbides on the morphology, distribution, and strength of the alloy were investigated following the solution treatment applied at different temperatures and durations. Samples were characterized by light metal microscopy, SEM, EDS, XRD analysis, hardness, and potentiodynamic polarization tests. After the process, due to the excess of more stable carbides and their homogeneous distribution within the structure, the highest hardness and corrosion values were revealed in the sample that was processed at 1000 °C for 100 h.

Keywords: casting; corrosion behavior; G-NiCr28W alloy; heat treatment; nickel alloy

Corresponding author: Alptekin Kısasöz, Yildiz Technical University, Istanbul, 34349, Türkiye, E-mail: akisasoz@gmail.com

About the authors

Kubilay Öztürk

Kubilay Öztürk graduated with MSc degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey. He is working as an engineer at TOFAS company. His main research areas are composite materials and heat treatment.

Alptekin Kısasöz

Dr. Alptekin Kısasöz, graduated with PhD degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey in 2015. He is working as an associate professor at Yildiz Technical University in the Department of Metallurgical and Materials Engineering. His main research areas are physical metallurgy and welding metallurgy.

Gökhan Özer

Dr. Gökhan Özer graduated with PhD degree in Metallurgical and Materials Engineering from Yildiz Technical University, Istanbul, Turkey. He is working as an assistant professor at Fatih Sultan Mehmet Vakif University. His main research areas are the corrosion properties of non-ferrous alloys.

Ahmet Karaaslan

Dr. Ahmet Karaaslan graduated with PhD degree in Metallurgical and Materials Engineering Montanuniversität Leoben. He is working at Gedik Company as a Welding Director. His main research areas are physical metallurgy and welding metallurgy.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2023-02-03

Published in Print: 2023-02-23

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Articles in the same Issue

https://doi.org/10.1515/mt-2022-0243

Keywords for this article

casting; corrosion behavior; G-NiCr28W alloy; heat treatment; nickel alloy