2. Heat treatment incidents and remedies
2.1 Tapestries
Tapping is the cracking of metal due to thermal stress: it can appear on heating (cracking inside the part) or cooling (cracking on the part skin).
Tapping on heating mainly concerns martensitic stainless steels, particularly those with a high carbon content. The following precautions can be taken (all aimed at limiting the core-skin thermal gradient):
place in a cold oven;
limit the rate of temperature rise (for example, do not exceed 300°C/h);
perform a landing during ascent (particularly at 600°C or before passing the Ac 1 transformation point);
for...
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Heat treatment incidents and remedies
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