Residual stress evolution and near-surface microstructure after turning of the nickel-based superalloy Inconel 718
2005 (English)In: Zeitschrift für Metallkunde, ISSN 0044-3093, Vol. 96, no 4, 385-392 p.Article in journal (Refereed) Published
Turning experiments have been carried out with the cutting speed and feed as variables that were systematically varied between 10 m min−1 and 1200 m min−1, and 0.1 mm and 0.5 mm, respectively, while all other cutting parameters were held constant. The arising residual stress distributions are presented and the influence of the varied machining parameters is investigated. Compressive residual stresses dominate the depth profiles but are often accompanied by a thin tensile residual stress layer at the surface. Microstructural investigations of near-surface cross-sections by means of transmission electron microscopy showed a zone where the grains had undergone plastic deformation, indicated by slip bands. On top of this layer, a surface layer exists where the grain size has radically decreased to only 50 nm to 130 nm. The grain size of the nanocrystalline layer is fairly constant for a certain cutting speed and feed, but depends on these cutting parameters. An increase in cutting speed and feed leads to larger grains in the nanocrystalline layer.
Place, publisher, year, edition, pages
2005. Vol. 96, no 4, 385-392 p.
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-28422Local ID: 13560OAI: oai:DiVA.org:liu-28422DiVA: diva2:249230