添加Cu对WC－13％Fe／Co／Ni硬质合金性能与组织的影响

INFLUENCE OF Cu ADDITION ON PROPERTIES AND STRUCTURE OF WC-13%Fe/Co/Ni CEMENTED CARBIDE

讨论了加入少量Ｃｕ对ＷＣ－１３％Ｆｅ／Ｃｏ／Ｎｉ硬质合金性能和组织的影响。叙述了在扫描电镜和透射电镜下，对该合金进行的金相观察和微观组织研究结果。结果表明，Ｃｕ有细化和球化ＷＣ晶粒的作用，当加Ｃｕ量为０．８％左右时，合金的性能最佳，其抗弯强度比未加Ｃｕ的合金高６７０Ｎ／ｍｍ２，可达到２３７０Ｎ／ｍｍ２。此外，合金在烧结后的缓冷过程中发生马氏体相变，其马氏体与γ相符合Ｋ—Ｓ取向关系。

This paper discussed the influence of small addition of copper on the pro perttes and structure of WC-13%Fe/Co/Ni cemented carbide. The results of metallographic observation and microstructure investigation on it were described in detail by using SEM and TEM. Results show that copper has a role of refining and sphericizing WC grain. In case of about 0. 8% of copper addition, optimum properties of such alloy can be obtained with a bending strength of 2370 N/mm2,670N/mm2 higher than that of alloy without copper addition. In addition,during the slow cooling process after sintering, a martensite transformation took place with a relation between martensite and γphase being in conformity with K-S orientation.