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采用Ｇｌｅｅｂｌｅ１５００热模拟试验机研究了变形温度、冷却速度对塑料模具７１８钢显微组织和硬度的影响。试验结果表明，７１８塑料模具钢在奥氏体区变形后，从６００℃开始以不高于０．０２℃／ｓ的速度缓慢冷却，可获得贝氏体组织，硬度（ＨＲＣ）为４０～４４；在奥氏体未再结晶区变形产生的位错缠结抑制了贝氏体铁素体的长大，并使７１８钢的硬度提高。
The effects of deformation temperature and cooling rate on the microstructure and hardness of 718 steel were studied by Gleeble1500 thermal simulation machine. The experimental results show that after the deformation of 718 plastic mold steel in the austenite region, the bainite structure can be obtained by slowly cooling from 600 ℃ to not more than 0.02 ℃ / s, and the hardness (HRC) is 40 ~ 44 The dislocation entanglement caused by the deformation of austenite in the non-recrystallization region restrains the growth of bainitic ferrite and increases the hardness of 718 steel.