Dear Sandeep:
A few things happen with Stress Relief:
- residual stress makes every thing brittle. Metals are more tough when they are not in tension and weldments always have residual stress at levels close to yield point.
- SR will temper the microstructure. This tempering like quench & temper steels, have a possitive effect on toughness and reduces brittleness.
- SR helps residual austenite transform to ferrite. This improves toughness.
- SR will reduce Hydrogen level in the weldment.
Hope you get the idea...
Regards
On Sun, Jun 30, 2013 at 3:24 PM, sandeep monody <smv.monody@gmail.com> wrote:
Dear sir
Thanks for your reply and I understand your explanations.
But now please clarify how does the brittleness changes after pwht?
I think no physical properties will change without change in chemical properties.
Sandeep.m.v
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