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本文研究了5CrMnMo模具钢淬火加热温度及保温时间与其组织形态及机械性能之间的关系。实验证明,适当提高加热温度,淬火后得到的细板条马氏体,经500℃回火后具有优良的综合机械性能。保温时间较短时,950℃加热淬火可获得最佳组织与性能;在长时间保温的条件下,890℃加热淬火可获得最佳结果。系统论证并肯定了5CrMnMo热锻模具钢890℃加热淬火的合理性。大型热锻模具钢实际加热时间较长,过分提高淬火加热温度将使模具边角部分及表层晶粒粗大,性能恶化。从使用性能和设备条件考虑,这样做都是不适宜的。
In this paper, the relationship between quenching temperature and holding time of 5CrMnMo tool steel and its microstructure and mechanical properties was studied. Experiments show that appropriate heating temperature, quenched fine lath martensite after tempering at 500 ℃ with excellent mechanical properties. When the holding time is short, the optimal structure and properties can be obtained by heating and quenching at 950 ℃. The best result is obtained by heating and quenching at 890 ℃ for a long time. Systematic demonstration and affirmed the 5CrMnMo hot forging die steel 890 ℃ heating quenching rationality. Large-scale hot forging die steel actual heating time is longer, excessive increase quenching temperature will make part of the mold corner and surface coarse grains, performance deterioration. From the performance and equipment conditions, this is not suitable.