Ni 作为铁元素扩散的载体,显著加快了铸铁短纤维烧结体的致密化。当镍含量高于4.5%时,显微组织中发现了奥氏体,在奥氏体与珠光体边界析出断网状渗碳体,在奥氏体晶内析出魏氏碳化物及游离石墨,引起致密化速率下降,断裂方式由延性断裂转化为脆性断裂。 Ni as a support for the diffusion of iron elements, significantly speeding up the densification of cast iron short fiber sintered body. When the nickel content is higher than 4.5%, the austenite is found in the microstructure, and the reticular cementite is precipitated on the boundary of the austenite and the pearlite, and the Wei’s carbide and free graphite are precipitated in the austenite crystal, Causing the rate of densification to decline. The fracture mode is transformed from ductile fracture to brittle fracture.