HQ785C钢示波冲击试验韧脆断裂转变特性研究  

Study on the Ductile/Brittle Fracture Transition Characteristics of HQ785C Steel with Instrumented Impact Tests

作　　者：李存剑[1] 李少华[1] 翁宇庆[2] 

机构地区：[1]冶金工业部钢铁研究总院 [2]冶金工业部

出　　处：《机械工程材料》1999年第1期12-14,共3页Materials For Mechanical Engineering

摘　　要：利用示波冲击试验及断口分析方法对ＨＱ７８５Ｃ钢的韧脆断裂转变特性进行了研究。结果表明，动态断裂韧性ＫⅠｄ与最大载荷吸收功Ｅｍ具有随温度一致变化的规律，而与总的冲击能Ｅｔ则无这种关系。试验还发现，屈服载荷与最大载荷相等的温度为材料的韧脆转变温度，该温度受控于材料的解理断裂应力σｆ，在此温度下有解理断裂发生。Abstract The characteristics of ductile to brittle fracture transition of HQ785C steel have been investigated by means of instrumented impact test and SEM. The results show that the dynamic fracture toughness K Ⅰd vs. temperature has the same trend as the absorbed energy E m up to maximum load, but has not the same trend as the total absorbed energy E t. It is also indicated that the temperature at which dynamic yield load equals maximum load is the temperature of ductile to brittle fracture transition, which is controlled by the cleavage fracture stress σ f. The cleavage fracture can occur below this temperature.

关 键 词：冲击试验 动态断裂 解理断裂 低合金高强度钢 

分 类 号：TG142.33[一般工业技术—材料科学与工程]