Effects on the deformation-induced martensitic transformation in AISI 304 in external longitudinal turning

• Main Authors: Berend Denkena, Bernd Breidenstein, Marc-André Dittrich, Hai Nam Nguyen, Lara Vivian Fricke, Hans Jürgen Maier, David Zaremba
• Format: Article
• Language: English
• Published: Elsevier 2021-05-01
• Series: Advances in Industrial and Manufacturing Engineering
• Subjects: Tool geometry; Deformation-induced martensitic transformation; Flank face modification
• Online Access: http://www.sciencedirect.com/science/article/pii/S2666912921000143

During the turning process of metastable austenitic steels, austenite is transformed into hard martensite by plastic deformation at low temperatures. This enables the production of components, which have both a hardened subsurface zone and a ductile core. Cryogenic cooling allows the subsurface zone to be hardened during machining, which leads to a shortening of the process chain. However, effects such as wear can make it challenging to adjust the properties of the subsurface zone during turning. By adjusting the tool microgeometry with a flank face modification, the wear condition can be kept constant for a certain period. In addition, the significance analysis with different tool microgeometries shows that only feed and initial temperature have a significant effect on the martensite formation.