Effect of Annealing on Yielded Tensile Specimen

[beh188]

I am wondering out of curiosity what effect an annealing process would have on a yielded tensile specimen. If you loaded a tensile specimen to the point of necking and then subjected this to annealing process, what type of state would the material return to? How about if the tensile specimen was only slightly yielded, more of a cold worked state?

 

[mk1979]

Annealing means that heating of steel above the temperatures of phse transformation followed by slow cooling. as a result of annealing ferrite and pearlite in hypoetecoid steel,pearlite in eutectoid,pearlite and cementite in hyperutectoid. annealing reduce the grain size,then the yield increase.
hope to get it

 

[metengr]

beh188;
Annealing a tensile specimen after it has yielded will remove all cold work or strain hardening introduced from the test and/or from prior manufacturing, and enable the specimen to accommodate more strain to failure. Annealing will not alter the existing permanent deformation of the specimen (return to original size) from tensile testing. The microstructure will most likely exhibit grain growth from exposure to annealing.

 

[EdStainless]

If the work was great enough, and the annealing temp low enough then you might get a finer grain size in the strained area.

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[TVP]

The previous replies contain good information. I would add that "annealing" is not specific enough, because it is used to describe many different processes across the different categories of metals (steel, cast iron, aluminum, copper, etc.). The reply from mk1979 is a perfect example: this is one description of annealing, but it does not encompass "sub-critical annealing" for example, which is a process that heats below the phase transformation temperature.