The tempering of hardened steels is surely one of the most important of industrial heat-treating operations. For this reason, the mechanisms underlying the process as well as the effect of tempering on final mechanical properties have received wide attention over the past half century. Much of this information is well summarized in a variety of reference books on steel heat treatment.1"4 It was recognized by early researchers5'6 that similar properties could be obtained in fully hardened steels that were tempered using a variety of time-temperature cycles. In other words, a high-temperature, short time cycle could readily be used to obtain tensile (but not necessarily fracture) properties identical to those developed during a lower- temperature, longer time treatment.The tempering of hardened steels is surely one of the most important of industrial heat-treating operations. For this reason, the mechanisms underlying the process as well as the effect of tempering on final mechanical properties have received wide attention over the past half century. Much of this information is well summarized in a variety of reference books on steel heat treatment.1"4 It was recognized by early researchers5'6 that similar properties could be obtained in fully hardened steels that were tempered using a variety of time-temperature cycles. In other words, a high-temperature, short time cycle could readily be used to obtain tensile (but not necessarily fracture) properties identical to those developed during a lower- temperature, longer time treatment.Download
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