Difference between revisions of "Iron"
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of P ; V ; T etc).<ref>Matthew Schwartz, ''Phase Transitions'' https://scholar.harvard.edu/files/schwartz/files/9-phases.pdf</ref> | of P ; V ; T etc).<ref>Matthew Schwartz, ''Phase Transitions'' https://scholar.harvard.edu/files/schwartz/files/9-phases.pdf</ref> | ||
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For Iron, ferromagnetic is a phase, like a permanent iron magnet. When you heat such a magnet to high enough temperature, it under-goes a phase transition and stops being magnetic. Its the difference between austenite and ferrite.<ref>Austenite vs. Ferrite — What’s the Difference?. https://www.askdifference.com/austenite-vs-ferrite/</ref><ref>Austenitic vs Ferritic Steels - What's the Difference - ThePipingMart Blog. https://blog.thepipingmart.com/metals/austenitic-vs-ferritic-steel-whats-the-difference/</ref> | For Iron, ferromagnetic is a phase, like a permanent iron magnet. When you heat such a magnet to high enough temperature, it under-goes a phase transition and stops being magnetic. Its the difference between austenite and ferrite.<ref>Austenite vs. Ferrite — What’s the Difference?. https://www.askdifference.com/austenite-vs-ferrite/</ref><ref>Austenitic vs Ferritic Steels - What's the Difference - ThePipingMart Blog. https://blog.thepipingmart.com/metals/austenitic-vs-ferritic-steel-whats-the-difference/</ref> | ||
Revision as of 15:36, 24 May 2024
Definition
Phases of Iron
A phase is a state of matter whose properties vary smoothly (i.e. it is an analytic function of P ; V ; T etc).[1]
For Iron, ferromagnetic is a phase, like a permanent iron magnet. When you heat such a magnet to high enough temperature, it under-goes a phase transition and stops being magnetic. Its the difference between austenite and ferrite.[2][3]
1. **Austenite**:
- Austenite represents a high-temperature, **face-centered cubic (FCC)** crystal structure of iron and iron-based alloys. - It is formed when iron or iron-based alloys are heated to high temperatures, typically above 912°C (1674°F) for pure iron. - In the austenite phase, iron atoms arrange themselves in a face-centered cubic lattice structure, characterized by iron atoms at the corners of a cube and one in the center of each face. - Austenite is relatively soft compared to other phases of iron. - Alloying iron with elements like nickel, manganese, and chromium stabilizes the FCC structure, allowing austenite to be retained at lower temperatures. - **Austenitic stainless steels**, which predominantly consist of austenite, are known for their corrosion resistance, hygiene, and aesthetics. They find use in kitchen appliances, cutlery, medical instruments, and architectural applications.[4]
2. **Ferrite**:
- Ferrite is a crystalline phase commonly found in metallic materials. - It is primarily formed when iron or iron-based alloys are cooled below a certain critical temperature (which varies based on alloy composition). - The most common form of ferrite is **alpha ferrite**, which exhibits a **body-centered cubic (BCC)** crystal structure. - Unlike austenite, ferrite is generally **magnetic** (ferromagnetic). - Ferrite is often low in carbon content. - It plays a crucial role in determining the properties and behavior of metals and alloys¹.
so:
- Austenite: FCC structure, non-magnetic or weakly magnetic, high-temperature phase.
- Ferrite: BCC structure, ferromagnetic, forms at lower temperatures.
References
- ↑ Matthew Schwartz, Phase Transitions https://scholar.harvard.edu/files/schwartz/files/9-phases.pdf
- ↑ Austenite vs. Ferrite — What’s the Difference?. https://www.askdifference.com/austenite-vs-ferrite/
- ↑ Austenitic vs Ferritic Steels - What's the Difference - ThePipingMart Blog. https://blog.thepipingmart.com/metals/austenitic-vs-ferritic-steel-whats-the-difference/
- ↑ What is the Difference Between Austenite and Ferrite. https://pediaa.com/what-is-the-difference-between-austenite-and-ferrite/
