TTT and CCT graphs for 316L 1

[edgedislocation]

are there any source for TTT and CCT graphs of 316L?

 

[kenvlach]

None that I know of.
What kind of transformation are you expecting?
Maybe hot austenite --> cool austenite?

 

[edgedislocation]

i am trying to find the best annealing and best cooling conditions for 316L. i wanna know which areas i must pass quickly etc...

 

[kenvlach]

Due to the low carbon content (<0.03 wt%), high cooling rate isn't critical. Annealing temperature range is 1850-2050 [sup]o[/sup]F (1010-1121 [sup]o[/sup]C), usually followed by water quenching (provided geometry doesn't cause distortion).
Biggest problem is scaling if done in air.

 

[edgedislocation]

we cool 316L in air. I don't know the term "scaling". Can you a little explain

 

[kenvlach]

Scaling = Surface oxidation. Mostly from the high T anneal, but of course can be avoided by inert or protective atmosphere or vacuum.

Since Cr preferentially oxidizes, the metal immediately below the oxide is lower in Cr, so lower corrosion resistance. The oxide scale is thus removed mechanically or by pickling, plus pickling removes the Cr-depleted metal surface. Then passivate to remove surface Fe & Ni and form a more protective, purer Cr[sub]2[/sub]O[sub]3[/sub] surface film.

 

[EdStainless]

There are TTT curves for the sensitization of stainless alloys, but since there are no phase transformations the only thing that you would worry about are secondary phases.

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