Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 10 - Phase Transformations: Development of Microstructure and Alteration of Mechanical Properties - Questions and Problems - Page 405: 10.36b

Answer

Tempered martensite is harder and stronger in as much as there is more ferrite-cementite phase boundary area for the smaller particles. Thus, there is greater reinforcement of the ferrite phase and more phase boundary barriers to dislocation motion.

Work Step by Step

Tempered martensite is harder and stronger in as much as there is more ferrite-cementite phase boundary area for the smaller particles. Thus, there is greater reinforcement of the ferrite phase and more phase boundary barriers to dislocation motion.
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