Chapter 12, Problem 12.53P

Interpretation Introduction

Interpretation:

The difference between eutectic and eutectoid reactions needs to be explained.

Concept Introduction:

A eutectoid reaction is defined as a three-phase reaction where the cooling process is done on a solid that transforms into other two solid phases at the same time. The phase diagram consists of the eutectoid point that indicates the location at which 3 solid phases co-exist. In eutectoid reaction, the austenite transforms into a phase mixture of ferrite and cementite.

Eutectic reaction is a 3-phase reaction.

This reaction includes cooling of a liquid that transforms into 2 solid phases at the same time.