Surface Integrity and Fatigue Performance of Inconel 718 in Wire Electrical Discharge Machining
2016 (English)In: Procedia CIRP 45 (2016) PP 307-310, 2016, Vol. 45, 307-310 p.Conference paper (Refereed)
This paper presents a study to characterize the surface integrity in wire electrical discharge machining (EDM) of Inconel 718 and investigate its effect on the fatigue performance of the alloy in a four-point bending fatigue mode at room temperature. The EDM process generates a rough recast surface with multi-types of defects. Surface craters, micro-cracks and micro-voids within the recast layer have been found to be most detrimental from the point of view of fatigue as they could provide many preferential initiation sites for fatigue cracks. As a consequence, the specimens with an EDM cut surface show an approximately 30% decrease in fatigue life compared to those with a polished surface, and multiple crack origins were observed on the fracture surface. The high tensile residual stresses generated on the EDM cut surface, on the other hand, are also believed to be partly responsible for the loss in fatigue life of the alloy machined by EDM.
Place, publisher, year, edition, pages
2016. Vol. 45, 307-310 p.
wire electrical discharge machining (wire EDM), surface integrity, fatigue, crack initiation, Inconel 718
Materials Engineering Other Materials Engineering
IdentifiersURN: urn:nbn:se:liu:diva-130582DOI: 10.1016/j.procir.2016.02.053OAI: oai:DiVA.org:liu-130582DiVA: diva2:953275
3rd CIRP Conference on Surface Integrity (CIRP CSI)8-10 June, Charlotte, USA