Steels having more than 0.5% carbon content are capable of being hardened without a drastic quenching operation, by the mechanism known as austempering, which is particularly used in hardening springs and involves isothermal transformation to the hard phase, martensite.
Austempering
Steels having more than 0.5% carbon content are capable of being hardened without a drastic quenching operation, by the mechanism known as austempering, which is particularly used in hardening springs and involves isothermal transformation to the hard phase, martensite.