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Study on surface defects in milling Inconel 718 super alloy
Liu Chang,Ren Chengzu,Wang Guofeng,Yang Yinwei,Zhang Lu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Nickel-based alloys have been extensively used as critical components in aerospace industry, especially in the key section of aeroengine. In general, these sections are manufactured by milling process because most of them have complex forms. However, surfacedefects appear frequently in milling due to periodic impact force, which leads to the deterioration of the fatigue life. We conducted millingexperiments under different cutting conditions and found that four kinds of defects, i.e., tear, cavity, build up edge (BUE) and groove,commonly appear on the machined surface. Based on the observed results, the morphology and generation regime of these defects areanalyzed and the carbide particle cracking is discussed to explain the appearance of the nickel alloy defects. To study the effect of thecutting parameters on the severity of these surface defects, two qualitative indicators, which are named as average number of the defectsper field and average area ratio of the defects per field, are presented and the influence laws are summarized based on the results correspondingly. This study is helpful for understanding the generation mechanism of the surface defects during milling process of nickelbased super alloy.
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