【作者】 黄庆奕；

【导师】 朱德贵；

【作者基本信息】 西南交通大学 ， 材料科学与工程， 2013， 硕士

【摘要】 高速钢又称锋钢,是一种高碳高合金莱氏体钢。由于具有高耐磨性、高硬度和耐热性,被广泛的应用于工具、模具和一些特殊零部件上。高速钢具有特殊的结构和性能,在特殊钢的使用中占有不可替代的地位。但是,高速钢大多由传统的浇铸法生成。这种方法生产的高速钢存在组织粗大,成分偏析等问题。本文采用粉末冶金法分别制备了T15M高速钢和T15M-4NSiC高速钢两种不同成分高速钢,有效的解决了组织粗大及成分偏析的问题。对T15M高速钢的热处理工艺进行了探索,分别研究了T15M高速钢和T15M-4NSiC高速钢的力学性能和滑动磨损机理,利用扫描电镜分析了高速钢的断口形貌以及磨损表面形貌。并且利用热分析法研究了二者的抗氧化性,对高速钢氧化物物相进行了XRD分析。分析了碳化硅的加入对T15M高速钢力学性能、磨损性能和抗氧化性的影响。主要研究结果如下：T15M高速钢在经1326℃淬火+540℃三次回火处理后的硬度达68.53HRC,碳化物形貌呈球形且大小合适均匀分布,残余奥氏体回火后几乎都转变为回火马氏体(残余奥氏体体积分数3.46%)。碳化硅的加入能明显的增加T15M高速钢的红硬性和耐磨性,但是确降低了其冲击韧性和抗弯性能,其中冲击韧性更是下降高达48.7%。高温时T15M高速钢表面能生成FeCr型及Fe203氧化膜阻止基体进一步氧化,碳化硅在高温时氧化生成SiO2对阻止高速钢高温氧化具有很好的作用。更多还原

【Abstract】 High-speed steel (HSS) is high carbon alloy ledeburite steel. It is important tool materials due to the fact that it offers a high wear resistance and high hardness. High-speed steel has special structure and properties, make it plays an irreplace role in special steel industry. But the high-speed steel which was produced by the traditional process has problems like coarse microstructure and composition segregation.In this thesis, T15M high speed steel and T15M-4NSiC high speed steel fabricated by means of powder metallurgy are studied. Powder metallurgy can solve problems like coarse microstructure and composition segregation effectively. To find better heat treatment process for T15M high speed steel, heat treatment processes was studied. And the mechanical property, wear mechanism and inoxidizability of T15M high speed steel and T15M-4NSiC high speed steel were also studied. The influence of SiC was also studied. The main studies are as follows:The optimized heat treatment processing of T15M high speed steel is quenching at1326℃and tempering at540℃three times. In this case, the hardness is high (68.53HRC), produced a rounded or globular form of carbide, most of the retained austenite translated into tempered martensite.(The volume fraction of retained austenite was3.46%).The addition of sic helped to significantly improve red hardness and abrasion performance, but reduced the impact toughness and bending properties, the impact toughness dropped as much as48.7%. At high temperature, a layer of oxides produced on the surface, to prevent further oxidation. Sic was oxidized to SiO2at high temperature to prevent further oxidation.更多还原