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Difference Between Austenite and Ferrite

July 12, 2018Posted byMadhu

Thekey differencebetween austenite and ferrite is that theaustenite hasface-centered cubic configurationof gamma iron whereas the ferrite hasbody-centered cubicalpha iron configuration.Further, austenite has a metallic appearance while ferrite has a ceramic-like appearance.

Austenite and ferrite areallotropesof iron. Moreover, these allotropes exist at different temperatures. The allotropes of iron are named differently as alpha iron, beta iron, gamma iron and delta iron. These allotropes exist at standard pressures. There are some allotropes of iron that exist at high pressures. For example, epsilon iron ( also known as ‘hexaferrum’).

CONTENTS

1.Overview and Key Difference
2.What is Austenite
3.What is Ferrite
4.Side by Side Comparison – Austenite vs Ferrite in Tabular Form
5.Summary

What is Austenite?

Austenite is an allotrope of iron known as gamma-phase-iron. Therefore, it ismetallicand non-magnetic. This allotrope occurs in different iron alloys at different temperatures. For example, in plain-carbon steel, this allotrope exists at 727°C while in stainless steel, it exists at room temperature. The cubic structure of this allotrope is face-centered cubic structure. When we change the temperature from 912 °C to 1,394 °C, this austenite allotrope forms from another allotrope called ferrite. We call this process austenitization. Austenite is relatively soft and ductile. As a result, it can dissolve more carbon in its solid solution.

What is Ferrite?

Ferrite is an allotrope of iron known as alpha-phase-iron. It has a ceramic-like appearance, and it isparamagnetic. It has the body-centered cubic structure. Moreover, the dissolution of carbon in this allotrope is poor.

Difference Between Austenite and Ferrite

Figure 01: Cubic Structures of Allotropes of Iron; Austenite (right) and Ferrite (left)

Furthermore, this material is a ceramic-like material. It has many applications in electronic devices. Since it is hard and brittle, we can find this iron in cast iron and steel.

What is the Difference Between Austenite and Ferrite?

Austenite is an allotrope of iron known as gamma-phase-iron. It has a metallic appearance, and it is soft relatively. Moreover, it is ductile and non-magnetic. Ferrite is an allotrope of iron that we call alpha-phase-iron. It has a ceramic-like appearance, and it is hard. In addition, it is brittle and paramagnetic. This is the main difference between austenite and ferrite.

Difference Between Austenite and Ferrite in Tabular Form

Summary – Austenite vs Ferrite

Austenite and ferrite are two allotropes of iron. The difference between austenite and ferrite is that the austenite has the face-centered cubic configuration of gamma iron whereas the ferrite has the body-centered cubic alpha iron configuration.

Reference:

1. Britannica, The Editors of Encyclopaedia. “Austenite.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 29 Apr. 2013.Available here
2.“铁”的同素异形体。维基百科,维基但书dation, 20 June 2018.Available here

Image Courtesy:

1.’IronAlfa&IronGamma’By Trempe_acier_et_mouvements_atomes.svg(CC BY-SA 3.0)viaCommons Wikimedia

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Filed Under:Inorganic Chemistry

About the Author:Madhu

Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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