Development and characterization of W-free Co-based superalloysW-free Co계 초합금설계 및 특성연구

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Superalloys show outstanding high-temperature properties such as creep, oxidation, and hot corrosion resistance and are therefore the key materials in jet propulsion gas turbines. Recently, Co-based superalloys have attracted a great deal of attention for high-temperature applications by the discovery of a γ/γ′ microstructure in the ternary Co-Al-W system. The main drawbacks of Co-Al-W-based superalloys are a limited γ′ phase stability and a high density. Co-Ti system, as the only known binary Co system which forms thermodynamically stable γ/γ′ microstructure, is used as the base system of alloy development instead of Co-Al-W. There are also several challenges associated with Co-Ti alloys which must be overcome such as a low γ′ volume fraction and γ′ solvus temperature. Therefore, more advanced Co-Ti-based alloys forming the desired γ/γ′ microstructures with optimized properties must be developed. In this dissertation, the effects of the alloying elements on the microstructure and mechanical properties of Co-Ti alloys were investigated. The atomic-scale elemental partitioning behavior of alloys were studied in terms of 3D atom probe tomography.
Advisors
Choi, Pyuck-Paresearcher최벽파researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2020.8,[vi, 93 p. :]

Keywords

Superalloys; alloy design; microstructure; 3D atom probe tomography; high temperature mechanical properties; 초합금; 합금설계; 미세구조; 3차원 원자 탐침 분석기; 고온 기계적 특성

URI
http://hdl.handle.net/10203/284365
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=924368&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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