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Home » Blogs » Industrial Heating Experts Speak Blog » David Pye - Metallurgy

Industrial Heating Experts Speak Blog
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Industrial Heating Blog
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.
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Blog Topics

Dan Herring - Heat Treatment

David Pye - Metallurgy

Dan Kay - Brazing

Debbie Aliya - Failure Analysis

George Vander Voort - Metallography

Thomas Joseph - Intellectual Property

Omar Nashashibi – Government

Reed Miller – Thermal Processing

Recent Comments

definitions HT, passivate

Man Care

Brazing of 2205 Duplex Stainless Steel to 7020 & 5083 Aluminum alloy

grain boundary oxidization

Thanks to the Mike or Mikes!

A Gas Nitriding Review

David Pye
David Pye
December 23, 2008
No Comments
Many companies are gas nitriding, and the process is 100 years old from the patent date. So, the process is not a new process. It is, however one of the “youngest” processes.
Read More

Quench-Oil Maintenance Recommendations

David Pye
David Pye
December 2, 2008
No Comments
Once again the price of oil is fluctuating. This time, it is decreasing in price. We can rest assured that the price will inevitably increase once again. This means that quench-oil price will also increase.
Read More

Calculating Electrical Energy for a Furnace Modification

David Pye
David Pye
November 11, 2008
No Comments
We are looking to redesign our air-circulating tempering furnace as far as the electrical energy input is concerned. We need to increase the gross load mass in the furnace. Therefore,
Read More

Why Would We Experience Below Surface Hardness on a Plasma-Nitrided Case Using AISI 4140 Steel?

David Pye
David Pye
October 29, 2008
No Comments
When nitriding a steel, it is advisable to have a core with a phase structure of tempered martensite. The tempered martensite will assist with the support of the formed case.
Read More

The Choice of Continuous DC or Pulsed DC for Nitriding

David Pye
David Pye
October 20, 2008
No Comments
Most plasma nitriding systems in North America have been developed on the basis of continuous DC plasma generation. There are, however, a small number of pulsed-DC plasma-generation systems. The question is often asked which system should I choose?
Read More

Maintenance of Quench Oil

David Pye
David Pye
October 9, 2008
No Comments
A recent seminar was held that was focused on gear distortion. While the distortion aspect of the seminar was extremely interesting and very well presented, the impact on the writer
Read More

Gas Nitriding - Control or No Control

David Pye
David Pye
October 2, 2008
One Comment
The process of gas nitriding is perhaps the simplest of all of the diffusion surface-treatment processes. The process simply involves the decomposition of ammonia by heat and steel (catalyst).The decomposition
Read More

More About Distortion

David Pye
David Pye
September 26, 2008
No Comments
Distortion is the “bane” of all heat treaters. Distortion is always laid at the doorstep of the heat treater. This is simply because distortion always occurs at heat treatment. Because
Read More

What is the difference between plasma carburizing and low-pressure carburizing? (Part 2)

David Pye
David Pye
August 27, 2008
No Comments
Plasma CarburizingPlasma carburizing is characterized by two things – plasma generation and low pressure. In order for the gas ionization to take place, it is necessary for the furnace to
Read More

If we use the low-pressure carburizing technique, how do we quench and into what medium?

David Pye
David Pye
August 12, 2008
No Comments
After low-pressure carburizing, one can quench as normal into, say, hot oil (if, of course, the vacuum furnace has a built-in integral-quench chamber).
Read More
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