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研究揭示了硬质合金热处理机理在于控制合金中钴相的固态相变、碳化物形貌及钴相中的析出物,确定了YG类硬质合金最佳淬火及回火工艺:淬火温度1250～1350℃,回火温度300～600℃,保温1～10小时,最好的淬火介质是机油,得到了性能良好的YG类热处理合金钎头,经现场使用证明比未热处理的寿命提高50～150％,φ150mm潜孔钻头寿命平均为600米/只,达到进口同类钻头水平,经初步试验证明经热处理的YW_2合金刀片,其耐用度比未热处理的提高6倍,为提高我国硬质合金质量开辟了一条新途径。 运用超过高压电镜等先进检测手段研究出添加Cr_3C_2二次抑制WC晶粒长大的机理,研制成性能优越的超细晶粒合金YS_2(YG10H);研究了矿用硬质合金球齿多冲断裂过程,发现部分WC—Co界面存在η相薄膜并阐明了其形成机理及消除方法;建立了YG11合金粘结相中WC的固溶度、体积分数和多冲寿命三者的经验公式;研究了硬质合金中
The research reveals that the mechanism of heat treatment of cemented carbides lies in the control of the solid phase transformation of the cobalt phase in the alloy, the morphology of the carbides and the precipitates in the cobalt phase. The optimum quenching and tempering process for the YG- 1350 ℃, tempering temperature 300 ~ 600 ℃, heat 1 to 10 hours, the best quenching medium is oil, get a good performance YG heat treatment alloy solder head, the use of the field proved than the heat treatment life expectancy increased by 50 to 150 %, Φ150mm DTH drill life of an average of 600 meters / only to reach the level of imports of similar drill, the preliminary test proved that the heat treatment YW_2 alloy blade, the durability than the non-heat treatment increased 6 times, to improve the quality of China’s hard alloy to open up A new way. The mechanism of adding Cr_3C_2 to restrain the growth of WC grains was further studied by using advanced inspection methods such as high pressure electron microscopy. The ultrafine grained alloy YS_2 (YG10H) with superior performance was developed. The results show that the formation mechanism and the elimination method of η phase thin film are found in some WC-Co interface. The empirical formula of solid solubility, volume fraction and multi-strike life of WC in YG11 alloy binder phase is established. Carbide