采用铸造法制备了含钨10％的高钨高速钢,利用XRD、SEM、HRTEM、EDAX研究了高钨高速钢中碳化物的类型、成分、结构及其界面晶体学特征.结果表明:高钨高速钢中的碳化物有两种,一种是凝固过程中析出的鱼骨状共晶碳化物,别一种为回火过程中析出的颗粒状二次碳化物,二者均为面立方晶体结构的M6C.共晶M6C的分子式可表达为(Fe0.55W0.30Cr008Mo007)6C,二次M6C中的合金元素含量与之基本相同.共晶M6C型碳化物与基体间存在晶体学关系,在铸态组织中,M6C的(111)晶面平行于铁素体(110)晶面,即M6C(111) //α-Fe(110),而高速钢回火后,基体组织转变成马氏体(M)与残留奥氏体,界面的晶体学位向关系变为:M6C(111) //M(020).二次M6C型碳化物与马氏体界面为良好的冶金结合,M6C的(133)晶面与马氏体的(101)晶面夹角约为140..部分二次M6C可以依附于共晶M6C析出,二者的(202)晶面共格.
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