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Machining of coarse grained and ultra fine grained titanium

机译：粗粒和超细钛的加工

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摘要

Machining of titanium is quite difficult and expensive. Heat generated in the process of cutting does not dissipate quickly, which affects tool life. In the last decade ultra fine grained (UFG) titanium has emerged as an option for substitution for more expensive titanium alloys. Extreme grain refinement can be readily performed by severe plastic deformation techniques. Grain refinement of a material achieved in this way was shown to change its mechanical and physical properties. In the present study, the microstructure evolution and the shear band formation in chips of coarse grained and UFG titanium machined to three different depths and three different feeding rates was investigated. A change in thermal characteristics of commercial purity Ti with grain refinement was studied by comparing heating/cooling measurements with an analytical solution of the heat transfer boundary problem. It was demonstrated that an improvement in the machinability can be expected for UFG titanium.
机译：钛的加工非常困难且昂贵。切削过程中产生的热量不会很快散逸，这会影响刀具寿命。在过去的十年中，超细晶粒（UFG）钛已经成为替代更昂贵的钛合金的一种选择。极端的晶粒细化可以通过严格的塑性变形技术轻松实现。以这种方式获得的材料的晶粒细化显示出会改变其机械和物理性能。在本研究中，研究了在三种不同深度和三种不同进给速度下加工的粗晶粒和UFG钛切屑的组织演变和剪切带的形成。通过将加热/冷却测量值与传热边界问题的解析解进行比较，研究了商业纯钛随着晶粒细化的热特性变化。已经证明可以期望UFG钛的切削性得到改善。

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  • 来源
    《Journal of Materials Science》 |2012年第11期|p.4589-4594|共6页
  • 作者

    R. Lapovok; A. Molotnikov; Y. Levin; A. Bandaranayake; Y. Estrin;

  • 作者单位

    Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;

    Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;

    Department of Physics, Monash University, Clayton, VIC, 3800, Australia;

    Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;

    Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;

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