Abstract

Through the use of tool coatings, a significant increase in tool life is possible. Particularly in the case of coatings obtained by physical vapor deposition, compressive residual stresses show a clearly positive influence on the wear behavior of coated carbide tools. In addition to being influenced by the coating process itself, the residual stress state of the coating can also be influenced by post-treatment processes like heat treatment or wet blasting. Compressive residual stresses can be measured using known X-ray diffraction techniques. However, these methods are very limited on strongly curved surfaces such as cutting edges. Raman spectroscopy has great potential for measurements in such areas. In order to use the Raman method to measure residual stresses on cutting tools, the TiAlN coatings were subjected to wet blasting and heat treatment. The residual stress state was determined by X-ray diffraction using the sin²ψ method and the depth-resolved scattering vector method. Then, measurements of Raman scattering of light were carried out and the peak shift of the transversal/longitudinal optical mode in the Raman spectrum was measured. Finally, the peak shift in the cutting edge area was determined. The investigations show that residual stresses mechanically induced by wet blasting can be reliably detected by Raman spectroscopy. Heat treatment effects are also clearly detectable, but here the correlation between peak shift and residual stresses determined by X-ray diffraction methods differs from the previous results due to the change in the crystal lattice dimensions. The residual stresses in the cutting edge area, converted from Raman peak shifts, show values of a plausible order of magnitude.

中文翻译：

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后处理 TiAlN 涂层碳化钨刀具局部残余应力的测定

摘要

通过使用刀具涂层，可以显着延长刀具寿命。特别是在通过物理气相沉积获得的涂层的情况下，压缩残余应力对涂层硬质合金刀具的磨损行为表现出明显的积极影响。除了受涂层工艺本身的影响外，涂层的残余应力状态还会受到热处理或湿喷砂等后处理工艺的影响。压缩残余应力可以使用已知的 X 射线衍射技术测量。然而，这些方法在诸如切削刃之类的强弯曲表面上非常有限。拉曼光谱在这些领域具有巨大的测量潜力。为了使用拉曼方法测量刀具上的残余应力，对 TiAlN 涂层进行了湿式喷砂和热处理。² ψ法和深度分辨散射矢量法。然后，进行光的拉曼散射测量，并测量拉曼光谱中横向/纵向光学模式的峰值偏移。最后，确定了切削刃区域的峰值偏移。研究表明，通过拉曼光谱可以可靠地检测湿喷砂机械引起的残余应力。热处理效果也可以清楚地检测到，但由于晶格尺寸的变化，由 X 射线衍射方法确定的峰值位移和残余应力之间的相关性与先前的结果不同。从拉曼峰位移转换而来的切削刃区域的残余应力显示出合理数量级的值。