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采用光学显微镜、扫描电镜、透射电镜、电子探针、X射线衍射仪、图象处理仪、磁性秤、差热分析仪、磨粒磨损机、拉伸和冲击试验机等,研究分析了Ni、Mn在奥贝球铁中的行为、分布和对奥贝球铁热处理工艺参数的影响。 深入探讨了 Ni及 Ni与 Mn复合作用、奥贝球铁处理工艺参数对奥贝球铁贝氏体转变动力学、热稳定性、组织形貌、性能的影响与机制。 系统提出并论述了金相法、硬度法、磁性法、残余奥氏体量法四种确定贝氏体第一阶段转变表面结束时间和实际结束时间的有效方法和原理。 发现并解释了奥贝球铁中存在的网球状石墨及其形成机制和作用。 提出了Ni、Mn对奥贝球铁组织均匀性、强韧化和贝氏体转变动力学的复合作用机制。指出了保证奥贝球铁生产工艺稳定性和最佳综合性能的关键因素。
The microstructure and mechanical properties of Ni, Ni, Fe, Ni and Ti alloys were investigated by using optical microscope, scanning electron microscope, transmission electron microscopy, electron probe, X-ray diffraction, image processing, magnetic scale, differential thermal analyzer, Behavior and Distribution of Mn in Obelisk Ductile Iron and Its Effect on Heat Treatment Process Parameters of. The effect and mechanism of Ni and Ni combined with Mn on the transformation kinetics, thermal stability, morphology and properties of austenitic bainite ferrite were discussed in depth. The paper presents and discusses the effective methods and principles of metallographic method, hardness method, magnetic method and residual austenite method for determining the surface finish time and the actual end time of the first phase of bainite transformation. Discovering and explaining the presence of tennis ball graphite in the oyster ductile iron and its formation mechanism and role. The composite mechanism of Ni and Mn on the microstructure homogeneity, strengthening and toughening and bainite transformation kinetics of austenitic ductile iron was proposed. It points out the key factors to ensure the stability and the best overall performance of the production process.