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首页> 外文会议>2012 Zhuzhou international conference on cemented carbides proceedings >Effects of Co Content in Substrates on the Cutting Performance of AlTiN Coated Cemented Carbide Tools During High-speed Machining Nickel-based Superalloy
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Effects of Co Content in Substrates on the Cutting Performance of AlTiN Coated Cemented Carbide Tools During High-speed Machining Nickel-based Superalloy

机译：高速切削镍基高温合金过程中基体中钴含量对AlTiN涂层硬质合金刀具切削性能的影响

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Two kinds of AlTiN coated cemented carbide tools with 6wt％ and 10wt％ cobalt content of substrate were fabricated by using cathodic arc-evaporation respectively.The thermal property and high temperature hardness of cemented carbide substrate were tested by using thermal constant analyser and high temperature Vickers hardness tester.The morphology and element distribution of the worn region of the tools after high-speed turning nickel based superalloy GH4133 were observed by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) respectively.Combined with the finite element analysis of cutting process,the effects of Co content in substrate on the tool cutting performance and the wear mechanisms of AlTiN coated cemented carbides were discussed.Experimental results show that with the decrease of cobalt content from 10wt％ to 6wt％,the thermal conductivity of the substrate increased from 62.75 W/m·℃ to 84.57 W/m·℃,and the high temperature Vickers hardness elevated by about 10wt％ at the same temperature.The finite element analysis results show that the substrate with 6wt％ cobalt content has lower cutting temperature for the coated tool due to higher thermal conductivity.Then the substrate with 6wt％ cobalt has higher hardness,the coated cemented carbide tool has better performance of abrasive wear resistance and adhesive wear resistance in cutting process.Meanwhile,the oxidation wear of the tool is decreased due to lower cutting temperature.The cutting life in machining nickel-based superalloy of AlTiN coated cemented carbide tool with low Co content in substrate is relatively longer.
机译：分别通过阴极电弧蒸发法制备了两种钴含量分别为6wt％和10wt％的AlTiN涂层硬质合金刀具。采用热常数分析仪和高温维氏仪分别测试了硬质合金基体的热性能和高温硬度。分别通过扫描电子显微镜（SEM）和能量色散X射线能谱（EDS）观察了高速车削镍基高温合金GH4133后刀具的磨损区域的形态和元素分布。分析了切削过程，探讨了基体中Co含量对AlTiN涂层硬质合金刀具切削性能及磨损机理的影响。实验结果表明，随着钴含量从10wt％降低到6wt％，合金的导热系数降低。基材从62.75 W / m·℃增加到84.57 W / m·℃，高温维氏硬度提高了b在相同温度下大约为10wt％。有限元分析结果表明，钴含量为6wt％的基体由于具有较高的导热性而使涂层刀具的切削温度降低。然后，钴含量为6wt％的基体具有较高的硬度，涂层的硬度较高。硬质合金刀具在切削过程中具有更好的耐磨性和粘结耐磨性。同时，由于降低切削温度而降低了刀具的氧化磨损。在使用AlTiN涂层的硬质合金刀具加工镍基高温合金时的切削寿命基材中低的Co含量相对较长。

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