Time dependance of SA or Austinitizing heat treat

[GRoberts]

Does anyone know of general literature or information on the effect of time at temperature for solution anealing or austenitizing (normalizing) on mechanical properties (especially toughness) and/or corrosion resistance. Information relating to welds/HAZs would be particulary helpfull.

 

[Metalguy]

First, are you interested in carbon steel, stainless, or ?

For carbon/low alloy steels, you want to make sure you keep the grain size as small as possible for good toughness. Avoid excessive time at temp. SA usually doesn't need much time, but norm. may need more, depending on what structure you're starting with.

 

[GRoberts]

Basically, I'm looking to find documented evidence of time dependancy of the mentioned heat treatments for low alloy/carbon steel, and stainless steel. For instance, on Duplex sst, it takes some amount of time to dissolve sigma. Where can I find written analysis on this type of event?

 

[kenvlach]

Hi,
It sounds as if you are asking for the original research on microstructural development that lead to adopting of the MIL and AMS standards, etc. Seems like a lot of searching through early literature (pre-Internet).
If you're not satisfied with just the end results, e.g., MIL-H-6875 from

http://assist2.daps.dla.mil/quicksearch/

then try looking up references in ASM Handbook, Vol. 4: Heat Treating. If you have a good university library nearby, you can start with a journal like Trans. AIME (which became Trans. TMS-AIME, Metallurgical Transactions (split into A & B), and is now Metallurgical and Materials Transactions A & B).