Effects of sintering temperature on interface microstructure and element diffusion of WC-Co-Ni-Fe/high-speed steel composites

• Published in: Materials letters 2022-03, Vol.310, p.131449, Article 131449
• Main Authors: Li, Hongnan, Yan, Ling, Zhang, Hongmei, Ai, Fangfang, Zhao, Dadong, Li, Yan, Jiang, Zhengyi
• Format: Article
• Language: English
• Subjects: Cemented carbides; Chromium; Cobalt; Composite materials; Diffusion; Diffusion layers; Diffusion rate; High speed tool steels; Iron; Laminates; Materials science; Metallurgy; Microhardness; Microstructure; Molybdenum; Multilayers; Nickel; Sintering; Tungsten carbide
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.131449

•WC-Co-Ni-Fe/High-speed steel (Cermet / steel) layered composites were successfully prepared.•The diffusion between elements is helpful to realize the stable and firm combination of WC-Co-Ni-Fe / High-speed steel .•When the sintering temperature is 1250 °C, a bonding phenomenon called reaction layer occurs.•The sintering temperature greatly affects the diffusion depth of WC / HSS elements. In this study, the layered composites of the micro bit with WC-Co-Ni-Fe as outer material and high-speed steel (HSS) as inner material were prepared by self-designed mold in the laboratory. The effects of sintering temperature on microstructure, interfacial element diffusion and microhardness of WC-Co-Ni-Fe/HSS composites were studied. The results show that with the increase of sintering temperature, the number of micropores in WC-Co-Ni-Fe/HSS composites decreases, the mutual diffusion trend of Co, Ni, Cr and Mo at band area increases, and W element has no obvious diffusion in band area. When the sintering temperature is 1250 °C, a reaction layer with a certain width begins to form at the interface between the WC-Co-Ni-Fe and high-speed steel, and the two materials are metallurgical bonded. When the sintering temperature was 1310℃, micropores were observed at the interface.