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(1) characteristics of the vacuum heat treatment
1) because in a vacuum heating and cooling, oxygen partial pressure is very low, parts of the surface oxidation inhibition to be processed, bright surface.
2) metal and alloy melting in the atmosphere, and the toughness decreased, because of the suction strength decrease, in the vacuum heat treatment, can make the absorption of gases released, thereby increasing the strength and toughness, enhanced the die service life.
3) vacuum heat treatment quenching deformation of small. Such as W6Mo5Cr4V2 steel convex mould vacuum heat treatment and cooling in nitrogen, deformation measurement results show that 0.08mm can only leave the grinding allowance. Cold working die steel die, deformation of salt bath quenching deformation 1/3~1/5.
4) due to treatment in sealed condition, has the advantages of non pollution and environmental protection.
5) heat transfer in vacuum is a heating body radiation, convection and conduction heat transfer is not to come, so the back part of the heating parts sometimes uneven.