(1. 中南大學(xué)粉末冶金國家重點實驗室，長沙 410083；
2. 硬質(zhì)合金國家重點實驗室，株洲 412000；
3. 株洲硬質(zhì)合金集團有限公司，株洲 412000)
摘 要: 為開發(fā)新型TiC基鋼結(jié)硬質(zhì)合金，采用Fe2Al5預(yù)合金粉末添加方式和普通液相燒結(jié)法制備不同Al含量(占粘結(jié)相含量的0、0.77%、1.54%、2.3%，質(zhì)量分?jǐn)?shù))的TiC-65%(Fe-Cr-Mo-Al-C)鋼結(jié)硬質(zhì)合金。探討Al含量對TiC-65%(Fe-Cr-Mo-Al-C)鋼結(jié)硬質(zhì)合金的組織與性能的影響規(guī)律；并考察Al含量對合金的燒結(jié)性、相種類及硬度的影響規(guī)律。結(jié)果表明：隨Al含量的增加，F(xiàn)e-C合金的包晶反應(yīng)溫度點降低，包晶反應(yīng)區(qū)間、BCC鐵素體區(qū)和低溫區(qū)的κ-碳化物沉淀區(qū)擴大；合金的硬質(zhì)相TiC形貌及分布相近，且Al主要是溶解在粘結(jié)相中；合金的鐵磁性與粘結(jié)相中奧氏體數(shù)量有關(guān)，隨Al含量的增加，淬火+回火態(tài)合金的硬度增加；其斷裂韌性、抗彎強度在Al含量為1.54%時達到峰值。
關(guān)鍵字: TiC；鋼結(jié)硬質(zhì)合金；Fe-Al-C；組織；性能
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. State Key Laboratory of Cemented Carbide, Zhuzhou 412000, China;
3. Zhuzhou Cemented Carbide Group Co., Ltd., Zhuzhou 412000, China）
Abstract:In order to develop new TiC based steel bonded carbide，TiC-65%(Fe-Cr-Mo-Al-C) (mass fraction) hard alloys with different Al contents (with respect to binder phase contents of 0, 0.77%, 1.54%, 2.3%, mass fraction)were prepared by common liquid phase sintering method with addition of Fe2Al5prealloyed powder. The effects of Al contents on the microstructure and mechanical properties of TiC-65%(Fe-Cr-Mo-Al-C) alloys were explored. The effects of Al contents on the sinterability, phase species and hardness of alloys were investigated. The results show that, according to the calculated phase diagrams of the Fe-Al-C alloys, with the increase of Al content, the peritectic reaction temperature decreases and the intervals of peritectic reaction, BCC ferrite and low temperature region κ-carbide precipitation zone expand. With the increase of Al contents, the morphology and distribution of hard phase TiC are similar. Al dissolves into the binder phase. The ferromagnetic is connected with the amount of austeniteof binder phase. With the increase of Al content, the hardness of quenched and tempered alloys increases with the increase of Al content. And their fracture toughness and bending strength reach the peak values.
Key words: TiC; steel bonded carbide; Fe-Al-C; microstructure; property
