N155 nickel alloy Composition and structure

N155 nickel alloy is a high-temperature strength alloy. Its composition and structure are analyzed in detail below:

1. Composition:
- Nickel (Ni): It is the basic element of N155 nickel alloy and has good corrosion resistance and high temperature strength.
- Chromium (Cr): Mainly used to improve the oxidation and corrosion resistance of N155 nickel alloy and increase the high-temperature strength of the alloy.
- Cobalt (Co): plays a key role in improving the high-temperature strength and thermal fatigue resistance of the alloy.
- Titanium (Ti): Together with aluminum (Al), it forms a solid solution strengthening phase to improve the strength and stability of the alloy.
- Aluminum (Al): Together with titanium (Ti), it forms a solid solution strengthening phase, which helps to improve the high-temperature strength and creep resistance of N155 nickel alloy.

2. Structure:
- Matrix structure: The matrix of N155 nickel alloy has a face-centered cubic structure (FCC), also known as austenite. This structure remains stable at high temperatures.
- Strengthening phase: There is a γ' phase in N155 nickel alloy, also known as the nickel ammonium phase. This phase is formed through precise proportions of alloying elements and specific heat treatment processes. The existence of γ' phase can significantly improve the thermal fatigue resistance and high temperature strength of the alloy.
- Other phases: In addition to the γ' phase, other precipitation phases may exist in N155 nickel alloy, such as γ" phase (dual-phase compound) and carbides. The formation of these phases helps to further enhance the mechanical properties and corrosion resistance of the alloy sex.

The specific N155 nickel alloy composition and structure may vary depending on the preparation process, alloy formulation and required properties. Therefore, in practical applications, the organizational structure of N155 nickel alloy can be optimized by adjusting the alloy composition and adopting appropriate heat treatment processes to meet the requirements of specific fields.

Pre: Properties and applications of N155 nickel alloy

Next: Research on high temperature corrosion resistance of N155 nickel alloy