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利用放电等离子烧结技术(SPS)实现了M42粉末高速钢的制备及与45钢的连接,对其界面的显微组织形貌、元素分布、显微硬度及相界面形成过程进行了测试分析。结果表明,接头过渡层的成分、显微硬度都呈现梯度变化,连接界面没有裂纹及大孔洞出现,界面结合紧密,其过渡层厚度可达10.2μm;界面连接为熔合连接与扩散连接的共同作用,其中烧结初期以熔合连接为主,烧结中后期,扩散连接逐渐成为主导。
The preparation of M42 powder high speed steel and its connection with 45 steel were realized by spark plasma sintering (SPS). The microstructure, elemental distribution, microhardness and interface formation process of M42 powder were tested and analyzed. The results show that the composition and the microhardness of the joint transition layer change with gradient, the interface has no cracks and big holes, the interface is close and the thickness of the transition layer can reach 10.2μm. The interfacial connection is the joint action of fusion and diffusion , In which the initial sintering to fusion-based connection, the latter part of the sintering, diffusion bonding gradually become the dominant.