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Learn from leading experts in the thermal processing industry. Read Industrial Heating’s Expert Speak blogs. Helpful and timely technical information from those who know.
A
wide variety of surface treatments and coatings are applied to metals to
enhance their performance, for example, to improve fatigue resistance, increase
wear resistance, or improve corrosion or oxidation resistance.
My article in the November issue of Industrial Heating generated some interest and may have caused some
unintended confusion. Here’s an edited comment received and my edited reply.
Fig. 1a. Example of a welded low-carbon steel etched with 2% nital showing the clear superiority of color etching in revealing the grain structure. The as-cast weld metal is shown
Welding
is a very important joining process and has been used extensively for at least
the past 60 years. Like most processes, there is a need to control welding and ensure
a high quality end result.
When I worked for Carpenter Technology Corporation in
their research center, we encountered several instances where production-lab
chart grain-size ratings were between 4 and 5 for a number of specimens on an
order (these orders required tests on 20 specimens from different bars).
The specimens were mounted and prepared metallographically. Each was etched with the reagents described below. They were re-prepared between etchants. The etchants used were as follows.
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heat treatment of Barrels
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