This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more.
This Website Uses Cookies
By closing this message or continuing to use our site, you agree to our cookie policy. Learn More
This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more.
Industrial Heating logo
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
Industrial Heating logo
  • EMAGAZINE
    • eMagazine
    • Archive Issues
    • Contact Us
    • Advertise
    • Subscribe
  • NEWS
  • FEATURED
    • IH Daily
    • IH MagEzine
    • Web Exclusives
    • The History of Industrial Heating
    • Heat Treatment Processes
    • Thermal Processing Products
    • Top 10 Heat-Treated Holiday Gifts
  • TOPICS
    • Additive Manufacturing / 3D Printing
    • Ceramics & Refractories / Insulation
    • Combustion & Burners
    • Heat Treating
    • Heat & Corrosion Resistant Materials / Composites
    • Induction Heat Treating
    • Industrial Gases & Atmospheres
    • Materials Characterization & Testing
    • Melting / Forming / Joining
    • Process Control & Instrumentation
    • Sintering / Powder Metallurgy
    • Vacuum / Surface Treatments
  • COLUMNS
    • Editorial
    • The Heat Treat Doctor
    • Federal Triangle
    • Academic Pulse
    • International – Brazil
    • Reshoring Initiative
    • Washington Watch
    • Technical Talk
  • BLOG
    • Dan Herring - Heat Treatment
    • David Pye - Metallurgy
    • Dan Kay - Brazing
    • Debbie Aliya - Failure Analysis
    • Thomas Joseph - Intellectual Property
    • Omar Nashashibi – Government
    • Reed Miller – Thermal Processing
  • DIRECTORIES
    • Equipment Buyers Guide
    • IH Buyers Guide eBook
    • Commercial Heat Treat Capabilities Directory
    • Aftermarket Parts & Services Directory
    • FORGE Buyers Guide
    • FORGE Buyers Guide eBook
    • Take a Tour
  • MULTIMEDIA
    • Podcasts
      • Interviewing the Author
      • Heat Treat Technical Talk
    • Videos
    • Webinars
    • eBooks
  • EVENTS
    • Meetings & Trade Shows
    • Heat Treat Show
    • Heating & Cooling
  • CE CENTER
  • MORE
    • Classifieds
    • White Papers
    • Industrial Heating Bookstore
    • Organizations
    • FORGE Magazine
    • Market Research
    • Custom Content & Marketing Services
Home » Topics » Commentary/Columns » The Heat Treat Doctor

The Heat Treat Doctor
The Heat Treat Doctor RSS FeedSubscribe

Monthly column written by one of the most influential men in the industry, Dan Herring.

ARTICLES

Dan Herring
The Heat Treat Doctor®

Carbonitriding of Fasteners

The carbonitriding of fasteners is of critical importance to their functionality and one of the most common case-hardening heat treatments. Studying how the process works in this application will shed a great deal of light on all carbonitriding processes. Let’s learn more.
Dan herring
Daniel H. Herring
June 8, 2020
No Comments

Gas carbonitriding is a modified form of the carburizing process and is not a form of nitriding. In this process, both carbon (C) and nitrogen (N) are introduced into the surface of the steel by introducing ammonia (NH3) and a hydrocarbon enriching gas into the furnace atmosphere in order to add nitrogen to the carburized case as it is being produced.


Read More
ih0520-htdr-fig2-900
The Heat Treat Doctor®

Endothermic Gas Generators

Dan herring
Daniel H. Herring
May 13, 2020
No Comments

The father of the endothermic gas generator was a gentleman by the name of Norbert K. Koebel, who was fond of saying to young engineers such as The Doctor, “Treat ‘em right and they’ll treat you right.”


Read More
ih0420-fig7-900
The Heat Treat Doctor®

Liquid-Metal Embrittlement

Dan herring
Daniel H. Herring
April 8, 2020
No Comments

Most heat treaters are aware of many failure phenomena, perhaps the most well-known of which is hydrogen embrittlement (aka hydrogen-assisted cracking). But there are several other types, such as liquid-metal embrittlement, that we must understand as well. Let’s learn more.


Read More
ih0320-vst-fig1-900.jpg
The Heat Treat Doctor®

An Overview of Nitriding – Technology and Tribological Benefits

This article will provide an overview of nitriding, which is a gaseous diffusion process in which nitrogen is absorbed into the surface of the steel.
Dan herring
Daniel H. Herring
March 6, 2020
2 Comments

The nitriding process begins at the surface of the part with the formation of a compound (aka white) layer, which depends to a large extent on the composition of the steel (in particular, the carbon content).


Read More
Dan Herring
The Heat Treat Doctor®

Retrogression and Re-aging for Aluminum Alloys (part 2)

February 7, 2020
No Comments

Retrogression heat treatment and re-aging (RRA) is used for retaining optimal strength in aluminum alloys while avoiding stress corrosion cracking (SCC). Last time, we learned about the SCC phenomenon and its effects on aluminum alloys.


Read More
ih0120-htdr-airliner-900
The Heat Treat Doctor®

Retrogression and Re-aging for Aluminum Alloys

Dan herring
Daniel H. Herring
January 6, 2020
No Comments
Retrogression heat treatment and re-aging (RRA) is used for retaining optimal strength in aluminum alloys such as 7075-T6 while avoiding stress corrosion cracking and for improving formability of aluminum components such as extrusions.
Read More
Dan Herring
The Heat Treat Doctor®

What Constitutes a Good, Workable Vacuum Maintenance Program (part 2)

Dan herring
Daniel H. Herring
December 4, 2019
No Comments
We conclude our vacuum preventive-maintenance (PM) discussion this month. See November’s issue for part 1.
Read More
ih1119-htdr-fig1-900
THE HEAT TREAT DOCTOR®

Vacuum Maintenance (part 1)

Dan herring
Daniel H. Herring
November 13, 2019
No Comments

We live in the real world, and things break down or otherwise drift from factory settings. Patchwork repairs (that all too often become permanent) and temporary fixes are poor substitutes for properly planned and well-executed maintenance activities.


Read More
ih1019-htdr-fig1-900
THE HEAT TREAT DOCTOR®

Extractive Metallurgy for the Heat Treater

Dan herring
Daniel H. Herring
October 10, 2019
No Comments

Extractive metallurgy is an area of our science that deals with the process and methods of gathering and isolating metals from their ores (i.e., natural mineral deposits) and in some instances refining them.


Read More
ih0919-htdr-fig1-900
THE HEAT TREAT DOCTOR®

Straight Talk About Decarburization and IGO/IGA

Dan herring
Daniel H. Herring
September 9, 2019
No Comments

Sometimes learning more about a common heat-treat phenomenon can yield a deeper understanding of the underlying principles involved.


Read More
More Articles Tagged with 'The Heat Treat Doctor'
Subscribe For Free!
  • eMagazine Issues
  • eNewsletters
  • Online Registration
  • Subscription Customer Service

More Videos

Popular Stories

harding

Reshoring Trend Update: It’s Time to Act

Thryistor

Thyristor Control: The Key to Delivering Precise, Efficient Electric Heating

Industrial Heating Web Exclusives

New Steel is Ultra-Strong and Stretchable

Events

January 1, 2030

Webinar Sponsorship Information

For webinar sponsorship information, visit www.bnpevents.com/webinars or email webinars@bnpmedia.com.
View All Submit An Event

Poll

Additive Manufacturing

Has additive manufacturing had any impact on your business?
View Results Poll Archive

Products

Practical Heat Treating: Basic Principles

Practical Heat Treating: Basic Principles

See More Products

IH Classifieds

Get our new eMagazine delivered to your inbox every month.

Stay in the know on the latest thermal-processing news and information.

SUBSCRIBE TODAY!
  • Want More?
    • Industry News
    • eNewsletter
    • Connect
  • Resources
    • Industry Links
    • Manufacturing Group
    • List Rental
    • Survey And Sample
  • Privacy
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2023. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing