Does direct hardening after carburisiong is a good idea?
Does direct hardening after carburisiong is a good idea?
(OP)
I have been hardening the case carburised material by reheating from room temperature to hardening temperature after carburisation process for materials like 8720, 9313, 4718 etc. Now I am planning hardening by bringing down the temperature to hardening temperature from carburising temperature for cost saving. I suspect that I may end up with high retained austenite. Please advise.





RE: Does direct hardening after carburisiong is a good idea?
If you determine you need low levels of retained austenite, an option after the carburizing quench is to perform a cryogenic treatment to assure as much transformation of retained austenite to fresh martensite, as possible.
RE: Does direct hardening after carburisiong is a good idea?
If I remember correctly, we would drop the carbon down to around 0.60%-0.75% (depending on grade) for the last 3 or 4 hours, but that's been 20 years ago.
rp
RE: Does direct hardening after carburisiong is a good idea?
RE: Does direct hardening after carburisiong is a good idea?