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During recent years, people involved in developing new metals and
materials for use in some of the rather extreme conditions of
stress, temperature, and environment have relied heavily on the
microstructural condition of their materials. In fact, many of the
newer materials, such as dispersion-strengthened alloys, have been
designed almost entirely by first determining the microstruc ture
desired and then finding the right combination of composition, heat
treatment, and mechanical working that will result in the de sired
microstructure. Furthermore, the extremely high reliability
required of materials used today, for example, in aerospace and
nuclear energy systems, requires close control on the microstruc
tural conditions of materials. This is clearly evident from even a
cursory examination of recently written specifications for mate
rials where rather precise microstructural parameters are stipu
lated. Whereas specifications written several years ago may have
included microstructural requirements for details such as ASTM
grain size or graphite type, today's specifications are beginning
to include such things as volume fraction of phases, mean free path
of particles, and grain intercept distances. Rather arbitrary terms
such as "medium pearlite" have been replaced by requirements such
as "interlamella spacing not to exceed 0. 1 micron. " Finally,
materials users have become increasingly aware that when a material
does fail, the reason for its failure may be found by examining and
"reading" its microstructure. The responsibility for a particular
microstructure and a resulting failure is a matter of growing
importance in current product liability consider ations."
/.letallography is much more than taking striking pictures at high
magnifications or polishing and etching specimens in such a way
that no scratches can be seen. Basically, metallography is the
physical metallurgist's most useful and most used tool for studying
metals. Although it is perhaps his oldest tool, it certainly is not
likely to become obsolete. Rather, the continued demands that have
been placed upon materials have required more detailed charac
terizations of their microstructures and this, in turn, has re
quired the metallographer to develop new techniques to make these
characterizations. Not too many years ago, the metallographer had
only optical microscopes with which to examine his specimens. Now
he has elec tron microscopes, scanning electron microscopes, and a
whole host of instruments which were unknown to him only a
relatively few years ago. This has forced him to learn not only how
to use these new instruments and how to interpret the information
that they provide but it also has made him develop new techniques
for preparing the samples for examination."
In recent years microstructural analysis has been a rapidly
changing field of scien tific endeavor. No longer are the efforts
of the microstructural analysts (sometimes referred to as
metallographers, materialographers, ceramographers, and similar
desig nations) limited to the tasks of polishing, etching, and
photographing specimens of materials. The performance demanded of
materials used for many current applica tions requires much more
complete characterizations than were possible only a scant few
years ago. Although the individuals who have been expected to
develop new and improved techniques to permit these required
characterizations have been severely challenged, in large part they
have met the challenge. In view of the many new developments in the
field of microstructural analysis and recognizing the requirements
to communicate these developments to the wide audience that might
make use of them, the American Society for Metals and the In
ternational Metallographic Society joined forces to co-sponsor a
symposium that was intended to bring participants and attendees up
to date on the subject "Inter pretive Techniques for
Microstructural Analysis." This symposium was held in Min neapolis,
Minnesota, USA, June 29 and 30, 1975. It followed two earlier
symposia co-sponsored by the same two societies on other subjects
of current interest to the metallographic community,
Microstructural Analysis - Tools and Techniques, 1972, and
Metallographic Specimen Preparation - Optical and Electron Micros
copy, 1973."
Detailed analyses of failures of material components have proved to
be valuable in many ways; by preventing further failures, by
assessing the validity of designs and the selection of materials,
by uncovering shortcomings in the processing of the materials in
volved through characterizations of defects, and by revealing
problems introduced during the manufacture or fabrication of the
component. Increased recognition of the value of performing failure
analyses has caused the field to develop into a very active area of
tech nical endeavor. Failure analysis has been employed in numerous
different technical dis ciplines and has proven beneficial. The
increased activity has caused many new and im proved methods for
performing these analyses to be developed. Among these are many
methods which can be characterized as generally belonging to the
field of metallography. In recognition of the important role that
metallography plays in the performance of failure analyses, the
absence of a text that specifically discusses this subject, and the
be lief that communication of information on the subject would be
of technical interest, The American Society for Metals and The
International Metallographic Society co sponsored a symposium. The
intent was to bring together world-recognized authorities working
in various aspects of the failure analysis and metallographic
fields to share meth ods they use, results they have obtained, and
the purposes to which they utilized these results. The symposium,
entitled "Metallography in Failure Analysis," was held in Hous ton,
Texas, USA, July 17-18, 1977."
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