Go to  Advanced Search

Please note that starting Tuesday, October 13th we will be making a number of modifications to integrate cIRcle into the new UBC Library Open Collections service. This may result in some temporary outages next week. Please keep this in mind when planning your work schedule. Apologies for any inconvenience.

Crystallography of low alloy iron martensites

Show full item record

Files in this item

Files Size Format Description   View
UBC_1967_A6_7 J37.pdf 8.413Mb Adobe Portable Document Format   View/Open
Title: Crystallography of low alloy iron martensites
Author: Jeffrey, Paul William
Degree: Master of Science - MSc
Program: Metallurgy
Copyright Date: 1967
Subject Keywords Martensite;Iron -- Metallography
Issue Date: 2011-08-06
Publisher University of British Columbia
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Abstract: The morphology and crystallography of the martensite transformation in pure iron and low alloy Fe-C, Fe-Mn, Fe-Mn-Si, Fe-Ni steels which contain no retained austenite was studied. Single surface trace analyses by transmission electron microscopy on directions parallel and normal to the martensite substructure were found to be consistent with the martensite crystals having the form of plates rather than needles. The directions normal to the martensite substructure plates were consistent with a {145}M habit plane. Optical studies of the martensite surface shears within prior austenite grains revealed that 4 shear variants generally occur. However grains containing 5 or more shear variants could be found which appears to suggest an austenite habit plan close to but different from {111}A. A single surface trace analysis of the martensite surface shears using the austenite annealing twin vestiges to orient the grain was consistent with an austenite habit plant ~ 7° from {111}A. Two inhomogeneous shear systems were found to predict the experimental results when applied to the Wecheler, Lieberman, Read theory of martensite transformations. They are (100)A[010]A and (111)A[112]A. The (111)A[112]A system is to be generally preferred as its predicted habit planes ( 7.12° from {111}A and 5.03° from {145}M are more consistent with the trace analyses. Preliminary work included an investigation of the maraging properties of the Fe-Mn-Si system.
Affiliation: Applied Science, Faculty of
URI: http://hdl.handle.net/2429/36573
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893