碳含量对WC-10Co-0.6Cr_3C_2硬质合金组织结构与性能的影响
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摘要
采用压力烧结法制备不同碳含量的WC-10Co-0.6Cr3C2硬质合金,通过金相组织观察、硬度测试、比饱和磁化强度和矫顽磁力的分析,研究该合金的微观组织结构和性能。结果表明,随碳含量增加,合金的饱和磁化强度增大,而密度、矫顽磁力及硬度均降低;在压力烧结条件下,对于WC-10Co-0.6Cr3C2合金,两相正常组织对应的碳含量范围为5.41%~5.55%。碳含量低于5.41%时出现缺碳相η相,碳含量高于5.55%时出现石墨相。
WC-10Co-0.6Cr3C2 cemented carbides was prepared by sinter-HIP. The physical and mechanical properties of the alloys with different carbon contents were tested by OM RHA analysis,magnetic saturation and coercive force analysis. The results show that the hardness, density and coercive force of the alloys decrease with carbon content increase. When the carbon content of the alloy varies from 5.41% to 5.55%, the alloys have a two-phase structure. When the carbon content of the alloys is lower than 5.41%, a carbon deficiency phase, i.e. the η phase appeares. When the carbon content of the alloys is higher than 5.55%, a free carbon phase appeares.
WC-10Co-0.6Cr3C2 cemented carbides was prepared by sinter-HIP. The physical and mechanical properties of the alloys with different carbon contents were tested by OM RHA analysis,magnetic saturation and coercive force analysis. The results show that the hardness, density and coercive force of the alloys decrease with carbon content increase. When the carbon content of the alloy varies from 5.41% to 5.55%, the alloys have a two-phase structure. When the carbon content of the alloys is lower than 5.41%, a carbon deficiency phase, i.e. the η phase appeares. When the carbon content of the alloys is higher than 5.55%, a free carbon phase appeares.
引文
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[15]谢文,黄文亮,黄前葆,等.WC-10%Co合金烧结过程中组织演变与矫顽磁力变化[J].硬质合金,2012,29(6):345-356.XIE Wen,HUANG Wen-liang,HUANG Qian-bao.Microstructure and coercive force evolution of WC-10%Co cemented carbide during sintering[J].Cemented Carbide,2012,29(6):345-356.
[16]鲍瑞,易健宏,杨亚杰,等.微波烧结粗晶低钴YG硬质合金存在的脱碳问题及其改进[J].粉末冶金材料科学与工程,2012,14(2):172-176.BAO Rui,YI Jian-hong,YANG Ya-jie,et al.Decarbonization and its improvement of coarse-grained low cobalt cemented carbide sintered by microwave irradiation[J].Materials Science and Engineering of Powder Metallurgy,2012,14(2):172-176.
[2]肖逸锋,贺跃辉,丰平,等.WC–Co梯度硬质合金的制备及渗碳对其组织的影响[J].材料热处理学报,2008,28(2):117-123.XIAO Yi-feng,HE Yue-hui,FENG Ping,et al.Preparation of WC-Co gradient cemented carbides and effects of carburizing on its microstructure[J].Transactions of Metal Heat Treatment,2008,28(2):117-123.
[3]张卫兵.WC、Co质量对超细硬质合金性能影响的研究[J].硬质合金,2003,20(3):157-160.ZHANG Wei-bing.Effect of quality of WC and Co on properties of ultrafine-grained cemented carbide[J].Cemented Carbide,2003,20(3):157-160.
[4]羊建高,王海兵,刘咏,等.WC晶粒度不同的双层硬质合金中的梯度结构[J].中南大学学报:自然科学版,2005,36(3):349-353.YANG Jian-gao,WANG Hai-bing,LIU Yong,et al.Gradient structure of coupled cemented carbides with different WC grades[J].Journal of Central South University of Technology:Natural Science,2005,36(3):349-353.
[5]马鋆,张立,南晴,等.Cr、V、Ta添加剂对超粗晶和特粗晶硬质合金电化学腐蚀行为的影响[J].粉末冶金材料科学与工程,2012,17(6):825-832.MA Yun,ZHANG Li,NAN Qing,et al.Effect of Cr,V,Ta additives on electrochemical corrosion behaviors of extra coarse and super extra coarse cemented carbides[J].Materials Science and Engineering of Powder Metallurgy,2012,17(6):825–832.
[6]ZHANG Li,XIE Ming-wei,CHENG Xin,et al.Micro characteristics of binder phases in WC-Co cemented carbides with Cr-V and Cr-V-RE additives[J].International Journal of Refractory Metals and Hard Materials,2013,36(1):211-219.
[7]ZHANG Li,WANG Yuan-jie,YU Xian-wang,et al.Crack propagation characteristic and toughness of functionally graded WC-Co cemented carbide[J].International Journal of Refractory Metals and Hard Materials,2008,26(4):295-300.
[8]张梅琳,朱世根,朱守星.超细及纳米硬质合金中碳含量的变化及对组织性能的影响[J].材料导报,2006,20(8):66-68.ZHANG Mei-lin,ZHU Shi-gen,ZHU Shou-xing.Carbon content change and its influence on structure and properties of ultrafine and nano-cemented carbide[J].Materials Review,2006,20(8):66-68.
[9]ZHANG Li,XIE Ming-wei,NAN Qing,et al.Transformation of cobalt gradient structure after resintering of DP cemented carbide[J].International Journal of Refractory Metals and Hard Materials,2013,38(1):118-123.
[10]吴悦梅,熊计,赖人铭.碳含量对WC-Co硬质合金显微组织的影响及其控制[J].硬质合金,2008,25(3):179-185.WU Yue-mei,XIONG Ji,LAI Ren-ming.Influence of carbon content on the microstructure of WC-Co cemented carbides and carbon control[J].Cemented Carbide,2008,25(3):179-185.
[11]马淳安,褚有群,黄辉,等.WC-Co硬质合金的相组成及其相变[J].浙江工业大学学报,2003,31(1):1–6.MA Chun-an,CHU You-qun,HUANG Hui,et al.Composition and phase transformation of WC-Co cemented carbide[J].Journal of Zhejiang University of Technology,2003,31(1):1–6.
[12]刘寿荣,宋俊亭,郝建民,等.WC-Co硬质合金的相转变[J].硬质合金,2001,18(3):129–133.LIU Shou-rong,SONG Jun-ting,HAO Jian-min,et al.Phase transformation in WC-Co cemented carbide[J].Cemented Carbide,2001,18(3):129-133.
[13]张立,吴冲浒,陈述,等.硬质合金晶粒生长抑制剂在合金中的微观行为[J].粉末冶金材料科学与工程,2010,15(6):667–673.ZHANG Li,WU Chong-hu,CHEN Shu,et al.Micro-behaviors of the grain growth inhibitors in cemented carbides[J].Materials Science and Engineering of Powder Metallurgy,2010,15(6):667–673.
[14]陈楚轩,黄鸿宇.WC-Co硬质合金的相对磁饱和[J].中国钨业,2009,24(5):82-85.CHEN Chu-xuan,HUANG Hong-yu.On the relative magnetic saturation of WC-Co cemented carbide[J].China Tungsten Industry,2009,24(5):82–85.
[15]谢文,黄文亮,黄前葆,等.WC-10%Co合金烧结过程中组织演变与矫顽磁力变化[J].硬质合金,2012,29(6):345-356.XIE Wen,HUANG Wen-liang,HUANG Qian-bao.Microstructure and coercive force evolution of WC-10%Co cemented carbide during sintering[J].Cemented Carbide,2012,29(6):345-356.
[16]鲍瑞,易健宏,杨亚杰,等.微波烧结粗晶低钴YG硬质合金存在的脱碳问题及其改进[J].粉末冶金材料科学与工程,2012,14(2):172-176.BAO Rui,YI Jian-hong,YANG Ya-jie,et al.Decarbonization and its improvement of coarse-grained low cobalt cemented carbide sintered by microwave irradiation[J].Materials Science and Engineering of Powder Metallurgy,2012,14(2):172-176.