tailieunhanh - Surface integrity analysis of WEDMed specimen of Inconel 825 superalloy

In this study, Inconel 825, widely used in aerospace industry for making of combustor casing and turbine blades, was machined with WEDM under different discharge energy. | Surface integrity analysis of WEDMed specimen of Inconel 825 superalloy International Journal of Data and Network Science 2 2018 79 88 Contents lists available at GrowingScience International Journal of Data and Network Science homepage ijds Surface integrity analysis of WEDMed specimen of Inconel 825 superalloy Pawan Kumara Meenu Guptaa and Vineet Kumarb a Department of Mechanical Engineering National Institute of Technology Kurukshetra India b Department of Mechanical Engineering UIET Maharishi Dayanand University Rohtak India CHRONICLE ABSTRACT Article history WEDM has evolved as a well admired technique for machining of difficult to cut materials such Received May 1 2018 as superalloys. WEDM produces intricate shape and profiles of superalloys by thermoelectric ero- Received in revised format June sion process. But as the process is carried out at very high temperature the formation of heat 16 2018 affected zone microcracks recast layer porosity etc. resulted in decreased surface integrity of Accepted July 26 2018 Available online machined specimen and becomes a big problem in WEDM. Discharge energy is the most influ- July 26 2018 encing parameters that affect the surface integrity of WEDmed samples. In this study Inconel Keywords 825 widely used in aerospace industry for making of combustor casing and turbine blades was WEDM machined with WEDM under different discharge energy. The surface topography of the WEDMed Inconel 825 specimen was carried cut by using SEM XRD and EDX techniques. It was observed from the Surface crack density SEM micrograph that the machined surface includes cracks pockmarks craters and pulled out Microstructure material. The density and sice of craters increase with increase in discharge energy. Surface crack Recast layer density of μm μm2 and recast layer thickness of was obtained for the machined sample at high value of discharge energy while at low value surface crack density of μm μm2 .