锰对中锰耐磨钢组织形态及相变的影响

通过DIL805A热分析仪、扫描电子显微镜、电子背散射衍射、透射电子显微镜、力学分析等方法研究Mn对中锰耐磨钢组织形态、相变及力学性能的影响.随着Mn的质量分数以2％的增量从3％提高到9％,室温奥氏体含量逐渐增多,抗拉强度及硬度逐渐降低,抗拉强度和室温奥氏体体积分数都在5％到7％时变化明显,马氏体与奥氏体的位向关系发生改变,马氏体形态类型逐渐由亚结构以位错为主的板条状α马氏体变化为亚结构以位错、相变内孪晶和层错为主的束状细片α马氏体和细片状ε马氏体.

Effects of Mn on the microstructure morphology and phase transformation of medium manganese wear resistant steel

The effects of Mn on the microstructure morphology,phase transformation and mechanical properties of medium manganese wear resistant steel were investigated by DIL805A thermal analyzer,scanning electron microscopy,electron back-scattered diffraction,transmission electron microscopy and mechanical testing.When the mass fraction of Mn increases from 3％ to 9％ by a 2％increment,the volume fraction of austenite at room temperature gradually increases.The tensile strength and hardness decrease especially at the mass fraction of Mn from 5％ to 7％.The orientation relationship between martensite and austenite varies.The morphology and type of martensite change from lath α martensite whose substructure is mainly dislocations to bunchy laminar oα martensite and laminar ε martensite whose substructure is mainly dislocations,twins through phase transition and stacking faults.