White Layer Formation Induced by Hard Turning

Startdatum 2010-10-01
Slutdatum Projektet är avslutat: 2014-12-31

​Hard turning is a machining process applied to metallic materials with hardness above 45 HRC. The process offers high production flexibility and sustainable manufacturing since it allows performing both rough and finishing machining of complex geometries in one single setup. With respect to surface integrity, hard turning can generate beneficial compressive residual stresses and good surface quality with small dimensional variation. However, deterioration of the cutting tool generates tensile residual stresses and also alters the surface microstructure, i.e. leads to formation of white layers. Since the mechanisms for white layer formation are not yet fully understood, there is limited understanding of whether there exists different types of white layers possessing different mechanical properties. Consequently, in this project a number of surface parameters related to white layers as formed by hard turning will be investigated:

  • Residual stresses
  • Retained austenite
  • (Fe, Cr)3C carbide morphology
  • White layer microstructure
  • Chemical composition
  • Hardness
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Publicerad: to 10 apr 2014.