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VC/Cr3C2及配碳量對WC-0.5Co超細(xì)硬質(zhì)合金組織與性能的影響
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硬質(zhì)合金國家重點(diǎn)實(shí)驗(yàn)室開放課題 (201103002)；國家杰出青年科學(xué)基金 (50925416)


Influence of VC/Cr3C2 and Mixed Carbon Content on Microstructure and Properties of Ultrafine WC-0.5Co Cemented Carbide
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    摘要:

    以超細(xì)WC粉末和超細(xì)WC-6Co復(fù)合粉末為原料，添加VC/Cr3C2作為晶粒長大抑制劑，同時進(jìn)行配碳，采用高能球磨和氣壓強(qiáng)化燒結(jié)制備晶粒度小于0.5 μm的WC-0.5Co超細(xì)硬質(zhì)合金，研究了不同VC/Cr3C2添加量及配碳量對其組織與性能的影響。結(jié)果表明：VC/Cr3C2有效抑制了燒結(jié)過程中WC晶粒的長大，顯著提高了WC-0.5Co超細(xì)硬質(zhì)合金的硬度。當(dāng)VC/Cr3C2添加量為0.73%（質(zhì)量分?jǐn)?shù)，下同）時，合金的硬度（HV0.05）最高，達(dá)到32 658 MPa；同時一定的配碳量有利于控制合金中的脫碳，提高合金性能，當(dāng)配碳量為0.2%時，WC-0.5Co-0.73VC/Cr3C2合金的綜合力學(xué)性能最好，斷裂韌性為6.935 MPa·m1/2，維氏硬度（HV0.05）為32 216 MPa

    Abstract:

    The ultrafine WC-0.5Co cemented carbide with a grain size smaller than 0.5 μm was prepared by high energy ball milling and HIP-sintering process. The raw materials were ultrafine WC and WC-0.5Co powder and the additives of grain growth inhibitor were VC/Cr3C2 and carbon. Microstructure and properties of the ultrafine WC-0.5Co cemented carbide with different VC/Cr3C2 and carbon contents were studied. The results show that there is a significant effect of VC/Cr3C2 on controlling WC particle size and hardness of ultrafine WC-0.5Co cemented carbide. Ultrafine WC-0.5Co cemented carbide has best Vickers hardness HV0.05 of 32 658 MPa with the VC/Cr3C2 content of 0.73% (mass fraction, similarly hereinafter). A certain amount of mixed carbon content is good for decarburization and properties of the ultrafine binderless cemented carbide. Ultrafine WC-0.5Co-073VC/Cr3C2 cemented carbide has best comprehensive mechanical properties with transverse rupture strength of 6.935 MPa·m1/2 and Vickers hardness HV0.05 of 32 216 MPa when the mixed content of carbon is 0.2%

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鄭虎春,范景蓮,楊文華,張忠健,劉 濤. VC/Cr3C2及配碳量對WC-0.5Co超細(xì)硬質(zhì)合金組織與性能的影響[J].稀有金屬材料與工程,2015,44(4):912~917.[Zheng Huchun, Fan Jinglian, Yang Wenhua, Zhang Zhongjian, Liu Tao. Influence of VC/Cr3C2 and Mixed Carbon Content on Microstructure and Properties of Ultrafine WC-0.5Co Cemented Carbide[J]. Rare Metal Materials and Engineering,2015,44(4):912~917.]
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  • 收稿日期:2014-04-13
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  • 在線發(fā)布日期: 2015-06-08
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