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The Influence of Cooling Nozzle Positions on the Transient Temperature Field during Cryogenic Turning of Metastable Austenitic Steel AISI 347

Metastable austenitic steels offer the opportunity of a surface layer hardening integrated in the machining process. The hardening effect is achieved by a deformation induced austenite‐martensite phase transformation, for which high mechanical loads and low temperatures are necessary, typically below room temperature. These conditions can be accomplished during cryogenic turning, allowing a phase transformation in the surface layer of the workpiece. To study the austenite‐martensite transformation behavior, information about the temperatures in the contact zone between tool and workpiece during machining is necessary, which can be hardly measured. Therefore, FE simulations of the process are utilized to calculate the transient process temperatures. In this paper predictive temperature field simulations for different settings of the cooling system, i.e. varying cooling nozzle positions, are performed in order to investigate the influence of the cooling nozzle positions on the temperature distribution during cryogenic turning and to correlate the results with measurements of the martensite content resulting for these cooling setups.