發(fā)布時(shí)間：2018-08-23 15:28

【摘要】：以粒度為5μm的粗WC顆粒和粒度為1μm的細(xì)WC顆粒為原料,采用6種不同的粗/細(xì)顆粒質(zhì)量配比,通過低壓燒結(jié)制備Co含量(質(zhì)量分?jǐn)?shù),下同)為7%的低鈷WC Co硬質(zhì)合金,測試材料的抗彎強(qiáng)度、斷裂韌性和硬度,并采用掃描電鏡(SEM)觀察材料的微觀組織、彎曲斷口形貌及裂紋擴(kuò)展情況,研究粗顆粒WC含量對(duì)低鈷硬質(zhì)合金組織與性能的影響。結(jié)果表明,隨粗顆粒WC含量增加,WC晶粒度的分布表現(xiàn)為明顯的雙峰結(jié)構(gòu)特征,從合金的彎曲斷口觀察到裂紋偏轉(zhuǎn)以及穿晶斷裂數(shù)量顯著增加,以此阻礙裂紋擴(kuò)展,從而提高合金的韌性。合金硬度隨粗顆粒WC含量增加而下降。當(dāng)粗顆粒含量(質(zhì)量分?jǐn)?shù))為50%時(shí),WC-7%Co硬質(zhì)合金具有較好的綜合力學(xué)性能,其硬度(HV30)為15.9 GPa,抗彎強(qiáng)度和斷裂韌性分別為2 490 MPa和11.39 MPa·m1/2。
[Abstract]:Using coarse WC particles (5 渭 m) and fine WC particles (1 渭 m) as raw materials, low cobalt WC Co cemented carbides with 7% Co content (mass fraction below) were prepared by low pressure sintering with six different coarse / fine particle mass ratios. The flexural strength, fracture toughness and hardness of the materials were tested. The microstructure, bending fracture morphology and crack propagation were observed by scanning electron microscope (SEM). The effect of WC content of coarse particles on the microstructure and properties of low cobalt cemented carbides was studied. The results show that with the increase of WC content of coarse particles, the grain size distribution of WC exhibits obvious bimodal structural characteristics. The crack deflection and the number of transgranular fracture are observed from the bending fracture of the alloy, which hinders the crack propagation. Thus improving the toughness of the alloy. The hardness of the alloy decreases with the increase of WC content of coarse particles. When the content of coarse particles (mass fraction) is 50, WC-7 and Co cemented carbides have better comprehensive mechanical properties, their hardness (HV30) is 15.9GPa. the flexural strength and fracture toughness are 2 490 MPa and 11.39 MPa m ~ (1 / 2), respectively.
【作者單位】： 中南大學(xué)材料科學(xué)與工程學(xué)院;中南大學(xué)粉末冶金國家重點(diǎn)實(shí)驗(yàn)室;硬質(zhì)合金國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助(51371199) 中南大學(xué)研究生自主探索創(chuàng)新項(xiàng)目(502200569)
【分類號(hào)】：TG135.5

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