采用单边缺口梁(SENB)法、扫描电镜和电子理论,研究了碳化钨(WC)增强钢基复合材料经960～1040℃奥氏体化及淬火、回火共12种状态的断裂行为和断口特征.实验结果表明,该材料在具有高强度(σbb～2200 MPa,σbc～3000 MPa)高硬度(HRC 62～68)的同时,还具有较高的SENB断裂韧性(～30 MPa·m1/2),断口形貌主要特征为WC解理、基体准解理及分散韧窝和韧窝带.研究发现,高体积分数(～40%)的硬质相对材料的断裂韧性和断裂行为起决定性作用,基体内存在的具有高共价键强的含碳结构单元和具有较多晶格电子的α-Fe(Ni)结构单元共同作用,既给予硬质相以强韧支持,又产生断裂时的微观延性.
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