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气门热精锻模具失效的主要形式是热磨损和压塌。 0 1 2 Al钢(5 Cr4Mo3Si Mn VAl)的室温及高温的硬度、磨损抗力、屈服强度和热稳定性 ,以及氮化能力比 3Cr2 W8V较高 ,因此用 0 1 2 Al钢替代传统应用的 3Cr2 W8V钢在理论上是合理的。再者 ,由于气门热精锻模具甚少因断裂失效 ,而且 0 1 2 Al钢比 3Cr2 W8V钢有较高的韧性 ,因而可以较大地提高 0 1 2 Al钢的淬火温度 (约 5 0℃ ) ,适当地降低加火温度 (约 30℃ ) ,在保证有足够韧性前提下 ,提高模具的室温及高温的硬度、磨损抗力、屈服强度和热稳定性 ,以提高模具寿命。生产试验表明 ,0 1 2 Al钢制气门热精锻模具的工作寿命是 3Cr2 W8V钢的 1 .8～ 2 .2倍。
Valve hot forging die failure is the main form of thermal wear and collapse. 0 1 2 Al steel (5 Cr4Mo3Si Mn VAl) at room temperature and high temperature hardness, wear resistance, yield strength and thermal stability, and nitriding than 3Cr2 W8V high, so the use of 0 1 2 Al steel instead of the traditional application of 3Cr2 W8V steel in theory is reasonable. Furthermore, since the valve hot forging die is less susceptible to fracture failure and the 0 12 Al steel has higher toughness than the 3Cr2 W8V steel, the quenching temperature of the 0 1 2 Al steel can be greatly increased (about 50 ° C) (About 30 ℃), to ensure adequate toughness premise, to improve the mold room temperature and high temperature hardness, wear resistance, yield strength and thermal stability, in order to improve die life. Production tests showed that the service life of 0 1 2 Al steel valve hot forging die is 1.8 ~ 2.2 times that of 3Cr2 W8V steel.