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On the Structure of Transformation Interfaces

Published online by Cambridge University Press:  15 February 2011

F. A. Khalid  and
D. V. Edmonds
F. A. Khalid
Affiliation:
Department of Materials University of Oxford Parks RoadOxford OX1 3PHUK
D. V. Edmonds
Affiliation:
Department of Materials University of Oxford Parks RoadOxford OX1 3PHUK
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Abstract

The transformation interfaces of some well known products of austenite decomposition in steels, namely pearlite, and proeutectoid grain boundary allotriomorphic cementite and Widmanstatten cementite, have been examined by TEM. This has been accomplished by using high- Mn high- C alloys that decompose at intermediate ageing temperatures but in which the untransformed parent austenite phase remains stable at room temperature, thus preserving the transformation interface. In conventional steels the residual austenite would undergo the martensite reaction, destroying the interface in the process. Defects in the interface have been analysed and related to intersections with stacking faults in the parent austenite phase. The nature and occurrence of these stacking faults, and their effect on the transformation, is considered.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 229: Symposium Q – Structure/Property Relationships for Metal/Metal Interfaces , 1991 , 325
Copyright
Copyright © Materials Research Society 1991

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