Surface roughness and sub-surface deformation measurements in machining of niobium

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review


Single-phase niobium is used in superconducting accelerator components in particle accelerating facilities. Functionality of such accelerator components is placing high demands on the surface quality. Single-phase niobium, as opposed to niobium alloys, is a highly ductile metal, which in a cutting process normally leads to such surface defects as adhesion, built-up edges, side flow, and burr formation. In this study, six different tool materials: uncoated and two types of coated cemented carbide, PCBN, PCD and single-crystal diamond have been tested in longitudinal turning of niobium at different cutting parameters, in order to achieve the target value of Ra = 0.8 μm. Experimental studies involved finish machining with varied feed and cutting speed, while depth of cut was kept at ap = 0.25 mm. Apart from the resulting surface finish Ra and cutting forces, the following surface quality parameters were analysed: side-flow, adhesion, burr formation and sub-surface deformation. Only two of the tool materials, PCD and nanolaminate TiAlN/TiSiN coated cemented carbide, have shown acceptable surface integrity results.
Original languageEnglish
Title of host publicationProcedia CIRP
Subtitle of host publication4th CIRP Conference on Surface Integrity (CSI 2018)
Number of pages5
Publication statusPublished - 2018

Publication series

NameProcedia CIRP
ISSN (Print)2212-8271

Subject classification (UKÄ)

  • Metallurgy and Metallic Materials


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