利用放电等离子烧结(SPS)技术一次性实现了M42粉末高速钢的制备及其与45钢的连接, 得到双金属复合材料, 并对其界面的显微组织、元素分布进行了分析; 结合传统的扩散理论, 提出了连接机制模型, 并对相界面的形成机理进行了探讨。结果表明: M42/45钢复合材料连接界面组织分布均匀, 没有裂纹及大孔洞出现, 界面结合紧密; 复合材料的界面形成机制为熔合连接与扩散连接的协同作用, 其中烧结初期以熔合连接为主, 后期扩散连接逐渐成为主导。

The preparation of M42 power high speed steel and the connection between M42 and 45 steel were performed at the same time using spark plasma sintering technology, and thus the bimetal composite was obtained. The microstructure and elemental distribution in the interface were analyzed. Based on the traditional diffusion theory, the connection models were proposed, and the interface forming mechanism was studied. The results show that the microstruture of connection interface of M42/45 steel composite was uniformly, no cracks or big holes were found, and the interface was compact. The interface forming mechanism of composite was the synergic action of fusion connection and diffusion connection, and fusion connection took a priority at the early stage of sintering, while diffusion connection gradually became dominant at later stage of sintering.