newf: if you are looking for pictures of cracked shotgun receivers, resulting from incorrect heat treating, i doubt if you will find them...after all, who would take pictures of such disasters?
over the years i have seen a few...a fox and a parker come to mind. i was able to salvage the barrels and wood from both of those guns. my gunsmith was able to fit the barrels to other guns to make two barrel sets. and the wood was used to replace other wood damaged beyond repair. so, they were not a total loss...
as for a written description of the reheat treating process for shotgun receivers, tony tredwell's chapter on the subject is the best that i have seen...he breaks it down into four major processes:
annealing, coloring, hardening and tempering.
if you have not purchased the on line version of tony's fine book. please do so. it is money well spent. the above referenced chapter alone is worth much more than the cost of the whole book.
Last edited by ed good; 06/08/12 10:23 PM.