Annealing

 

Annealing heat treating processes are used to modify the microstructure of steel in order to obtain specific mechanical properties.  Annealing is defined as a heat treating process used primarily to reduce steel strength. For carbon steels there are a few different processes including recrystallization anneal, full anneal, and spheroidize anneal.

Common usage has extended the term anneal to other heat treating processes for purposes such as improving electrical properties, stress relief, and elimination of hydrogen. In this lesson, only the processes used for reduction of strength will be discussed.

This lesson teaches about the recrystallization anneal, full anneal, and spheroidize anneal heat treating processes – why they are used, thermal profile, and microstructure changes that occur, and effects on properties.

What you will learn about carbon steel annealing

  • Recrystallization anneal (process anneal), full anneal, and spheroidizing anneal thermal profiles
  • Alloys used with the processes
  • Objectives of the anneal processes
  • Microstructure changes during the heat treatments
  • Effects on steel strength, hardness, formability, and machinability

Prerequisite Lessons

We recommend that you take the lessons below prior to taking the Annealing lesson

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    Sam Bloodgood, VP Process Improvement, Hydraforce, Inc.
  • "I oversee several operations, including steel heat treating and laser welding. However, my background was in the construction materials industry. Principles of Metallurgy gave me the knowledge to have meaningful discussions with my engineers and be able to ask them better questions."

    Tom Parkman, Plant Manager, Simonds International.
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  • “The Principles of Metallurgy course is broke up into convenient length modules that can be fit into the busiest schedule. The course is a good review for engineers who had a materials class ten or more years ago.”

    Paul Flury B/E Aerospace
  • “This is an excellent course (Metallurgy of Steel Heat Treating) for learning basic heat treating practices. The course introduces and covers a broad range of processes. I would recommend it for anyone in the steel business.”

    Jim Marks, Magellan Corporation
  • “This course has given me more confidence in my job and given me a better understanding of some of the heat treatments used in the business.”

    Mark Winter, Abbey Forged Products
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