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<p>Tool wear and surface quality are significantly influenced by work hardening during machining. This work focused on the work hardening behavior during the machining of WNbMoTaZr<sub>x</sub> (x = 0.5 and 1.0) refractory high entropy alloys (RHEAs). The effect of polycrystalline cubic boron nitride tool geometric parameters on cutting forces, Vickers hardness, and the microstructure of machined side surface of RHEAs was studied. It was found that the RHEAs showed different degrees of work hardening. Compared to WNbMoTaZr<sub>0.5</sub>, the softer and tougher interdendrites of WNbMoTaZr<sub>1.0</sub> compressed the dendrite area under the grinding and squeezing effect of negative chamfering surface, which effectively reduced the degree of work hardening and led to the appearance of abnormal cutting forces. The changes of negative chamfer angles and tool corner radius also affected the degree and behavior of work hardening. In conclusion, RHEAs showed different work hardening behaviors, including dendrite refinement, dendrite breakage, and dendrite compression, which in turn resulted in different degrees of work hardening and increase in cutting force.</p>

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On the work hardening behavior of machining WNbMoTaZrx (x = 0.5 and 1.0) refractory high entropy alloys

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Haidong Yang,
  • Richeng Sheng,
  • He Lin,
  • Junsheng Zhang,
  • Xiquan Xia,
  • Shunhua Chen

摘要

Tool wear and surface quality are significantly influenced by work hardening during machining. This work focused on the work hardening behavior during the machining of WNbMoTaZrx (x = 0.5 and 1.0) refractory high entropy alloys (RHEAs). The effect of polycrystalline cubic boron nitride tool geometric parameters on cutting forces, Vickers hardness, and the microstructure of machined side surface of RHEAs was studied. It was found that the RHEAs showed different degrees of work hardening. Compared to WNbMoTaZr0.5, the softer and tougher interdendrites of WNbMoTaZr1.0 compressed the dendrite area under the grinding and squeezing effect of negative chamfering surface, which effectively reduced the degree of work hardening and led to the appearance of abnormal cutting forces. The changes of negative chamfer angles and tool corner radius also affected the degree and behavior of work hardening. In conclusion, RHEAs showed different work hardening behaviors, including dendrite refinement, dendrite breakage, and dendrite compression, which in turn resulted in different degrees of work hardening and increase in cutting force.