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Introduction to Quantitative Metallography (part 1)
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With
this blog, we begin a multi-part discussion of quantitative metallography. |
by George F. Vander Voort | May 7, 2012 | Comments (1)
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Metallography of Surface Treatments, Coatings (part 2)
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maximum edge retention, it is necessary to mount specimens before commencing
the grinding and polishing steps. |
by George F. Vander Voort | March 26, 2012 | Comments (0)
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Metallography of Surface Treatments, Coatings (part 1)
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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. |
by George F. Vander Voort | March 12, 2012 | Comments (0)
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Microstructure of Nitrided Steels Q&A (part 3)
Microstructure of Nitrided Steels Q&A (part 2)
| My last blog post was followed by further discussion that might be helpful to other
readers. |
by George F. Vander Voort | January 12, 2012 | Comments (0)
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Microstructure of Nitrided Steels Q&A
| 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. |
by George F. Vander Voort | December 20, 2011 | Comments (0)
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Use of Color Metallographic Techniques to Study Welds (part 2)
Use of Color Metallographic Techniques to Study Welds
| 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. |
by George F. Vander Voort | November 18, 2011 | Comments (0)
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Revealing Prior-Austenite Grain Boundaries by Etching
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specimens can be etched to reveal prior-austenitic grain boundaries, they must
be prepared to a high quality level. |
by George F. Vander Voort | November 4, 2011 | Comments (0)
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Bias in Grain-Size Chart Ratings
| 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). |
by George F. Vander Voort | October 3, 2011 | Comments (0)
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Study of Selective Etching of Carbides in Steel (part 2)
| A variety of etchants were
tried to darken the matrix. |
by George F. Vander Voort | September 1, 2011 | Comments (0)
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Study of Selective Etching of Carbides in Steel (part 1)
| A number of etchants have been reported in the
literature to selectively outline, outline and color, or attack specific types
of carbides in steels. |
by George F. Vander Voort | August 15, 2011 | Comments (0)
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Identification of Phases in Stainless Steels by Selective Etching (part 2)
| 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. |
by George Vander Voort | July 21, 2011 | Comments (0)
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Identification of Phases in Stainless Steels by Selective Etching (part 1)
| The microstructural constitution of stainless steels is quite complex, and exposure to high operating temperatures adds to the complexity as a variety of phases can occur.
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by George Vander Voort | July 14, 2011 | Comments (0)
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Picric Acid – Hazards and Safe Usage
| Picric acid is widely used in metallography labs for the very common etchants known as picral and in Vilella’s reagent as well as several other formulations. |
by George Vander Voort | May 6, 2011 | Comments (1)
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