Abstract
The severe work hardening phenomenon generated in the machining of Inconel 718 is harmful to continue cutting processes, while being good for the component’s service performance. This paper investigates the performance of cryogenic assisted machining used in the cutting processes, which can reduce the waste of fluids. The influence of dry and cryogenic machining conditions with different cutting speeds on the work hardening layer is investigated based on the interrupted cutting of Inconel 718. Cutting temperature distribution obtained from simulations under different conditions is used to discuss the potential mechanism of work hardening. Then, the depth of work hardening and degree of work hardening (DWH) are investigated to analyze the surface deformation behavior, which strengthens the machined surface during metal cutting processes. From the cutting experiments, the depth of the work hardening layer can reach more than 60 μm under the given cutting conditions. In addition, a deeper zone can be obtained by the cooling of liquid nitrogen, which may potentially enhance the wear performance of the component. The results obtained from this work can be utilized to effectively control the work hardening layer beneath the surface, which can be applied to improve the service performance.
Highlights
As one of the super alloys containing a niobium age-hardening addition, Inconel 718 takes advantage of its very high strength and anti-fatigue properties [1]
The mechanical properties of Inconel 718 are greatly enhanced by its austenitic face-centered cubic (FCC) crystal structure with high phase stability
This paper focuses on the surface hardening behavior during the cryogenic-assisted turning of Inconel 718 with uncoated carbide cutting inserts
Summary
As one of the super alloys containing a niobium age-hardening addition, Inconel 718 takes advantage of its very high strength and anti-fatigue properties [1]. This material has been widely used in the manufacture of components for liquid rockets, as well as parts for aircraft turbine engines, cryogenic tankage, etc. The cutting temperature would rise drastically, and plastic deformation of the cutting tool eventually takes place with the low thermal conductivity during machining of Inconel 718 [4]. This material is very hard to machine compared with conventional materials. The high-performance machining of this kind of material is a promising research area for the public
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