|
INTRODUCTION
- Lesson 2
This set of photomicrographs that I made of this
group of specimens in the M.I.T. collection shows a wider range of
microstructures and properties than the group in Lesson 1.
Whether intentionally or not, the heat treatments did not always
produce desirable results. Many of these failures of heat
treatment can be modified by repeating or altering the heat
treatment. That is why they are of particular interest to
physical metallurgists and why an understanding of the kinetics of
these phase changes is so important. |
| Allow plenty of
time to study and to take good notes about each specimen. About
two hours per lesson would be appropriate. You will be expected
to interpret some of these specimens during the final
examination. Feel free to use the Internet to find additional
information about the alloys and applications mentioned here. |
| Whenever the
narrator asks a question, be sure to commit yourself to an answer
before going to the next page. You can backtrack with your
browser's BACK button at any time, of course. Just be sure to click
the FORWARD button to return to the proper page before proceeding so
that you don't get lost. |
| FIRST
SPECIMEN |