Effect of Cr/Ti/Al Elements on High Temperature Oxidation Behavior of a Ni-Based Superalloy with Thermal Exposure

Byung Hak Choe; Sung Hee Han; Dae Hyun Kim; Jong Kee Ahn; Jae Hyun Lee; Kwang Soo Choi

doi:10.3740/MRSK.2023.33.2.77

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2023 Vol.33, Issue 2 Preview Page

Research Paper

Effect of Cr/Ti/Al Elements on High Temperature Oxidation Behavior of a Ni-Based Superalloy with Thermal Exposure 고온 노출 니켈기 초내열합금 터빈 블레이드의 Cr/Ti/Al 성분이 고온 산화에 미치는 영향

27 February 2023. pp. 77-86

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Abstract

High-temperature oxidation of a Ni-based superalloy was analyzed with samples taken from gas turbine blades, where the samples were heat-treated and thermally exposed. The effect of Cr/Ti/Al elements in the alloy on high temperature oxidation was investigated using an optical microscope, SEM/EDS, and TEM. A high-Cr/high-Ti oxide layer was formed on the blade surface under the heat-treated state considered to be the initial stage of high-temperature oxidation. In addition, a PFZ (γ’ precipitate free zone) accompanied by Cr carbide of Cr₂₃C₆ and high Cr-Co phase as a kind of TCP precipitation was formed under the surface layer. Pits of several µm depth containing high-Al content oxide was observed at the boundary between the oxide layer and PFZ. However, high temperature oxidation formed on the thermally exposed blade surface consisted of the following steps: ① Ti-oxide formation in the center of the oxide layer, ② Cr-oxide formation surrounding the inner oxide layer, and ③ Al-oxide formation in the pits directly under the Cr oxide layer. It is estimated that the Cr content of Ni-based superalloys improves the oxidation resistance of the alloy by forming dense oxide layer, but produced the σ or µ phase of TCP precipitation with the high-Cr component resulting in material brittleness.

Keywords

Ni-based superalloy

thermal exposure

high temperature oxidation

Cr/Ti/Al oxide

precipitate free zone

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :2
Pages :77-86
Received Date : 2022-11-11
Revised Date : 2023-02-20
Accepted Date : 2023-02-23
DOI :https://doi.org/10.3740/MRSK.2023.33.2.77

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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