High temperature deformation of Ni-base superalloys, 니켈기 초합금의 고온 변형

소개

High temperature deformation of Ni-base superalloys, 니켈기 초합금의 고온 변형

목차

1. Nickel-base superalloys
2. Microstructure of Ni-base superalloys
3. High-Temperature Creep
4. High temperature deformation mechanisms

본문내용

1. Nickel-base superalloys
Nickel-base superalloys are used in highly demanding applications such as energy and aerospace industries. These alloys present good corrosion resistance, weldability and mechanical stability at high temperatures [1]. Therefore, they are an exceptional class of structural materials for high-temperature applications. This alloy is utilized at temperatures greater than 0.7 times the melting temperature (Tm) [2].

Figure 1 Alloying elements present in Ni-base superalloys [3]
Many Ni-base alloys contain up to 40 wt% of a combination of five to ten other elements. The elements typically alloyed with nickel to form a superalloy are shown in Figure 1.

2. Microstructure of Ni-base superalloys
In broad terms, the elemental additions in Ni-base superalloys can be categorized as being i) Gamma formers (elements that tend to partition to the Gamma matrix, ii) Gamma' formers (elements that partition to the Gamma' precipitate, iii) carbide formers, and iv) elements that segregate to the grain boundaries [4]. The major phases present are as follows:

참고자료

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