低合金高硼高速钢轧辊的铸态组织

Microstructure of as-cast low alloy high speed steel roll containing boron

设计了一种用廉价的硼元素部分(或全部)取代普通高速钢轧辊中价格昂贵的合金元素的轧辊。借助光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等方法对高硼高速钢轧辊铸态组织进行研究。结果表明:高速钢轧辊铸态组织主要由马氏体基体和少量的残余奥氏体以及M23(B,C)6,M3(B0.7C0.3)和(W,Mo)2(B,C)碳硼化合物组成,基体显微硬度达到820～950 HV,轧辊的铸态硬度大于64 HRC。

A low alloy high speed steel（HSS）,containing boron,which could be used for roll steel,was successfully designed.Microstructure of the as-cast low alloy HSS roll was investigated by means of optical microscopy（OM）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.Its hardness was tested.The results show that the microstructure of the low alloy HSS roll containing boron consists of lath martensite and a small amount of retained austenite,borocarbides of M23（B,C）6,M3（B0.7C0.3） and（W,Mo）2（B,C）.The micro-hardness of the matrix of the as-cast steel is 820-950 HV and the hardness of the as-cast high speed steel roll exceeds 64 HRC.