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Can high alloy dies with high temperature hardening be tempered for a long time instead of multiple times?
Time：
Apr 18,2016
High-temperature quenching of high-alloy dies to be tempered several times, such as hot forging die made of 3Cr2W8 steel to be tempered more than twice. This is because these high-temperature quenching of high-alloy workpiece, after quenching organization has more residual austenite, the purpose of multiple tempering is to make the residual austenite in tempering cooling to complete the transformation to martensite, so that the residual austenite transformation of martensite and then into tempered martensite. If the use of a long time tempering is difficult to achieve the above organizational transformation, is not sufficient tempering, it will lead to secondary hardening phenomenon is not obvious, the workpiece size stability is poor, brittleness is larger, life is low.
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