高硼中碳合金工具钢的铸态组织  

As-cast Microstructure of High-boron Middle-carbon Alloy Tool Steel

作　　者：严军[1] 岑启宏[1] 蒋业华[1] 周荣[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料工程》2013年第6期55-58,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51171073;51261013)

摘　　要：针对普通高速钢含有大量贵重合金元素的缺陷,设计了一种用廉价的硼元素部分取代普通高速钢中价格昂贵的铬、钨、钼、钒等合金元素的新型耐磨材料。借助光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)和能谱仪(EDS)等手段对高硼中碳合金工具钢的铸态组织进行了分析。结果表明:高硼中碳合金工具钢铸态组织由马氏体、少量残留奥氏体及Fe2B,Fe3(B,C),Fe23(B,C)6,Cr7(B,C)3和(W,Mo)2(B,C)等共晶硼碳化合物或硼化物组成。其基体和共晶硬质相的显微硬度分别为540～620HV和1180～1520HV,铸态宏观硬度达到55HRC。A new wear-resistant material containing boron instead of those high-cost alloying elements was designed for the high contents of alloying elements in common alloy tool steel. The as-cast micro-structure of high-boron middle carbon alloy tool steel was researched by means of optical microscopy, X-ray diffraction, scanning electron microscopy and energy dispersive spectrometer. The results show that the as-cast microstructure of high-boron middle carbon alloy tool steel consists of lath martensite, a small amount of retained austenite and eutectic borocarbides or boides of Fe2B, Fe3 （B,C）, Fe23 （B, C）6, Cr7 （B,C）a and （W,Mo）e （B,C）. The micro-hardness of the matrix is 540-620HV while that of the hard phase is 1180-1520HV, and the hardness of as-cast high-boron middle-carbon alloy tool steel is 55HRC.

关 键 词：合金工具钢 铸态组织 硼碳化合物 硬度 

分 类 号：TG142.11[一般工业技术—材料科学与工程]