Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718
Inconel 718 is a typical hard-to-machine material that requires thermally enhanced machining technology such as laser-assisted milling. Based upon finite element analysis, this study simulates the forces in the laser-assisted milling process of Inconel 718 considering the effects of grain growth due...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2017-01-01
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| Series: | Manufacturing Review |
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| Online Access: | https://doi.org/10.1051/mfreview/2017005 |
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| author | Pan Zhipeng Feng Yixuan Lu Yu-Ting Lin Yu-Fu Hung Tsung-Pin Hsu Fu-Chuan Lin Chiu-Feng Lu Ying-Cheng Liang Steven Y. |
| author_facet | Pan Zhipeng Feng Yixuan Lu Yu-Ting Lin Yu-Fu Hung Tsung-Pin Hsu Fu-Chuan Lin Chiu-Feng Lu Ying-Cheng Liang Steven Y. |
| author_sort | Pan Zhipeng |
| collection | DOAJ |
| description | Inconel 718 is a typical hard-to-machine material that requires thermally enhanced machining technology such as laser-assisted milling. Based upon finite element analysis, this study simulates the forces in the laser-assisted milling process of Inconel 718 considering the effects of grain growth due to γ' and γ" phases. The γ" phase is unstable and becomes the δ phase, which is likely to precipitate at a temperature over 750 °C. The temperature around the center of spot in the experiments is 850 °C, so the phase transformation and grain growth happen throughout the milling process. In the analysis, this study includes the microstructure evolution while accounting for the effects of dynamic recrystallization and grain growth through the Avrami model. The grain growth reduces the yield stress and flow stress, which improves the machinability. In finite element analysis (FEA), several boundary conditions of temperature varying with time are defined to simulate the movement of laser spot, and the constitutive model is described by Johnson-Cook equation. In experiments, this study collects three sets of cutting forces and finds that the predicted values are in close agreements with measurements especially in feed direction, in which the smallest error is around 5%. In another three simulations, this study also examines the effect of laser preheating on the cutting forces by comparison with a traditional milling process without laser assist. When the laser is off, the forces increase in all cases, which prove the softening effect of laser-assisted milling. In addition, when the axial depth of milling increases, the laser has a more significant influence, especially in axial direction, in which the force with laser is more than 18% smaller than the one without laser. Overall, this study validates the influence of laser-assisted milling on Inconel 718 by predicting the cutting forces in FEA. |
| first_indexed | 2024-12-16T23:03:05Z |
| format | Article |
| id | doaj.art-72a870d64b434f78a9e9e4a9b2018d53 |
| institution | Directory Open Access Journal |
| issn | 2265-4224 |
| language | English |
| last_indexed | 2024-12-16T23:03:05Z |
| publishDate | 2017-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Manufacturing Review |
| spelling | doaj.art-72a870d64b434f78a9e9e4a9b2018d532022-12-21T22:12:40ZengEDP SciencesManufacturing Review2265-42242017-01-014610.1051/mfreview/2017005mfreview170004Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718Pan ZhipengFeng YixuanLu Yu-TingLin Yu-FuHung Tsung-PinHsu Fu-ChuanLin Chiu-FengLu Ying-ChengLiang Steven Y.Inconel 718 is a typical hard-to-machine material that requires thermally enhanced machining technology such as laser-assisted milling. Based upon finite element analysis, this study simulates the forces in the laser-assisted milling process of Inconel 718 considering the effects of grain growth due to γ' and γ" phases. The γ" phase is unstable and becomes the δ phase, which is likely to precipitate at a temperature over 750 °C. The temperature around the center of spot in the experiments is 850 °C, so the phase transformation and grain growth happen throughout the milling process. In the analysis, this study includes the microstructure evolution while accounting for the effects of dynamic recrystallization and grain growth through the Avrami model. The grain growth reduces the yield stress and flow stress, which improves the machinability. In finite element analysis (FEA), several boundary conditions of temperature varying with time are defined to simulate the movement of laser spot, and the constitutive model is described by Johnson-Cook equation. In experiments, this study collects three sets of cutting forces and finds that the predicted values are in close agreements with measurements especially in feed direction, in which the smallest error is around 5%. In another three simulations, this study also examines the effect of laser preheating on the cutting forces by comparison with a traditional milling process without laser assist. When the laser is off, the forces increase in all cases, which prove the softening effect of laser-assisted milling. In addition, when the axial depth of milling increases, the laser has a more significant influence, especially in axial direction, in which the force with laser is more than 18% smaller than the one without laser. Overall, this study validates the influence of laser-assisted milling on Inconel 718 by predicting the cutting forces in FEA.https://doi.org/10.1051/mfreview/2017005Inconel 718Laser-assisted millingFEARecrystallization |
| spellingShingle | Pan Zhipeng Feng Yixuan Lu Yu-Ting Lin Yu-Fu Hung Tsung-Pin Hsu Fu-Chuan Lin Chiu-Feng Lu Ying-Cheng Liang Steven Y. Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 Manufacturing Review Inconel 718 Laser-assisted milling FEA Recrystallization |
| title | Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 |
| title_full | Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 |
| title_fullStr | Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 |
| title_full_unstemmed | Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 |
| title_short | Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718 |
| title_sort | microstructure sensitive flow stress modeling for force prediction in laser assisted milling of inconel 718 |
| topic | Inconel 718 Laser-assisted milling FEA Recrystallization |
| url | https://doi.org/10.1051/mfreview/2017005 |
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