Abstract
Inconel 718 is widely used in the aviation, space, automotive and biomedical industries because of its outstanding properties. Near-surface residual stresses that are induced by ball end milling in Inconel 718 can be crucial for the performance and service time of the machined parts. In this paper, the influences of cutting conditions, including the use of cutting parameters, cutting fluid and spindle angles, on the residual stresses in the ball end milling process of Inconel 718 alloy were investigated experimentally. X-ray diffraction measurements reveal that residual stress distributions are highly influenced by cutting parameters, especially the depth of cut and cutting speed. The milling operation with cooling induces more compressive stresses trend and the magnitude of the residual stresses increases in the tensile direction with the increase of spindle angles. These cutting induced effects were further discussed with respect to thermal- mechanical coupling theory and some observations made by optical microscopy. From this investigation, it is suggested that the machining process parameters are not the smaller the better for the control of residual stresses in the ball end milling process of Inconel 718.
Highlights
Because of its high strength at high operation temperatures, good anti-corrosion property and low heat transmit rate, Inconel 718 is used extensively for aerospace and other components that operate at terrible working environments[1]
This paper presents a new knowledge on residual stresses generated in the ball end milling process of one major difficult-to-machine materials: Inconel 718
Case studies were performed in order to establish the influence of cutting conditions on the residual stresses through a series of experiments
Summary
Because of its high strength at high operation temperatures, good anti-corrosion property and low heat transmit rate, Inconel 718 is used extensively for aerospace and other components that operate at terrible working environments[1]. Studies on machining Inconel 718 have shown that the residual stress profiles induced by turning are hookshaped distribution along the depth direction. Tensile residual stresses with a maximum value of 1300MPa exhibit at the machined surface and turn rapidly into compressive state of up to -800MPa. Outeiro et al.[10] investigated the influence of cutting parameters on residual stresses induced by dry turning of Inconel 718 and AISI 316L with uncoated and coated carbide tools. Outeiro et al.[10] investigated the influence of cutting parameters on residual stresses induced by dry turning of Inconel 718 and AISI 316L with uncoated and coated carbide tools According to their results, high tensile residual stresses are found at the machined surface and compressive residual stresses are found in the sub-surface with a depth of 10-25 um. The effects of the cutting conditions, including cutting parameters, spindle angles and cutting fluid, on residual stresses were analyzed and discussed experimentally
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
