The influence of the crystallographic orientation when micro machining commercially pure titanium: A size effect

Kieren-Ehses, Sonja; Böhme, Luisa; Morales-Rivas, Lucía; Lösch, J.; Kirsch, Benjamin; Kerscher, Eberhard; Kopnarski, Michael; Aurich, Jan C.

doi:10.1016/j.precisioneng.2021.04.007

Cited by 24 publications

(7 citation statements)

References 49 publications

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“…Furthermore, the crystallographic texture of IN718 fabricated by LPBF varied depending on process parameters, which were < 100>/<110 > lamella, < 100 > single crystal-like, and randomly oriented polycrystal-like microstructures depending on the applied laser energy density. The relation between grain orientation and nished surface roughness after micromachining and orthogonal cutting of cp-Ti has been recently reported by Kieren-Ehses et al [29], showing the correlation between grain orientation and machining performance as well as surface roughness, thus, highlighting the importance of crystallographic orientation control via LPBF and its effect on WEDM performance as discussed in this study.…”

Section: Ramakrishnan and Karunamoorthysupporting

confidence: 75%

“…XRD patterns and SEM microstructure images of wrought and LPBF-IN718 samples are presented in Figure 2 2). Note that the electrical and thermal conductivities of the material, which affect machinability, are altered by the grain size, grain boundary, and grain orientation, thus, microstructural characteristics of the samples are critical for determining the machining performance [29,[33][34][35][36].…”

Section: Resultsmentioning

confidence: 99%

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Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Gokcekaya

Günen²,

Ceritbinmez³

et al. 2023

Preprint

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Inconel 718 alloy is difficult to machine using conventional methods due to its physical properties. Thereby, additive manufacturing (AM) of IN718 components with near-net shapes has been excessively studied. Even though AM processes provide shape and size accuracy, there is still the need for the machining of the AM-processed components. Laser powder bed fusion (LPBF) has been successfully utilized to fabricate near-net shape IN718 components, moreover, the microstructure of LPBF-IN718 was unique owing to the AM processing, resulting in differences in grain size, grain boundary characteristics, and grain orientations. Furthermore, these microstructural characteristics are expected to alter the machining performance of IN718. Therefore, this study investigated the wire electro-discharge machining (WEDM) performance of LPBF-718 samples compared to wrought IN718 while focusing on the unique microstructure characteristics of LPBF-IN718 samples (lamella, single-crystal, ploy-crystal). Three different cutting strategies (rough, semi-finish, and finish) were implemented to understand the performance of the multi-pass cutting phenomenon and its effect on the surface of IN718. For all samples, rough (single pass) cutting displayed high roughness while finish (three passes) cutting exhibited good surface quality. Compositional analyses on the machined surface showed debris formation including Zn and Cu-containing recast material, indicating wire erosion. The surface of single-crystal LPBF-IN718 after the WEDM process was smooth owing to its big grain size and less amount of grain boundary, resulting in slow cutting speed but a good surface finish. Thus, this study, for the first time, investigated the effect of unique microstructural characteristics of LPBF-fabricated IN718 on WEDM performance and machined surface quality.

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Section: Ramakrishnan and Karunamoorthysupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Gokcekaya

Günen²,

Ceritbinmez³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Furthermore, the crystallographic texture of IN718 fabricated by LPBF varied depending on process parameters, with microstructures of < 100 > / < 110 > lamella, < 100 > single-crystal-like, and randomly oriented poly-crystal-like being produced depending on the applied laser energy density. The relation between grain orientation and finished surface roughness after micromachining and orthogonal cutting of cp-Ti has been recently reported by Kieren-Ehses et al [31], showing the correlation between grain orientation and machining performance as well as surface roughness, thus highlighting the importance of crystallographic orientation control via LPBF and its effect on WEDM performance as discussed in this study.…”

Section: Introductionsupporting

confidence: 76%

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Gokcekaya,

Günen,

Ceritbinmez

et al. 2024

Int J Adv Manuf Technol

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Inconel 718 alloy is difficult to machine using conventional methods due to its physical properties. Thereby, additive manufacturing (AM) of IN718 components with near-net shapes has been extensively studied. Even though AM processes provide shape and size accuracy, there is still the need for the machining of the AM-processed components to achieve the final shape of a component. Laser powder bed fusion (LPBF) has been successfully utilized to fabricate near-net shape IN718 components; moreover, the microstructure of LPBF-IN718 was unique owing to the AM processing, resulting in differences in grain size, grain boundary characteristics, and grain orientations. Furthermore, these microstructural characteristics are expected to alter the machining performance of IN718. Therefore, this study investigated the wire electro-discharge machining (WEDM) performance of LPBF-718 samples compared to wrought IN718 while focusing on the unique microstructure characteristics of LPBF-IN718 samples (lamella, single-crystal, ploy-crystal). Three different cutting strategies (rough, semi-finish, and finish) were implemented to understand the performance of the multi-pass cutting phenomenon and its effect on the surface of IN718. For all samples, rough (single pass) cutting displayed high roughness, while finish (three passes) cutting exhibited good surface quality. Compositional analyses on the machined surface showed debris formation including Zn and Cu-containing recast material, indicating wire erosion. The surface of single-crystal LPBF-IN718 after the WEDM process was smooth owing to its large grain size and less amount of grain boundary, resulting in slow cutting speed but a good surface finish. Thus, this study, for the first time, investigated the effect of unique microstructural characteristics of LPBF-fabricated IN718 on WEDM performance and machined surface quality.

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“…and composites (Carbon Fiber Reinforced Plastics, etc.) [15][16][17][18][19]. Stainless steel, favored for its strength, durability and corrosion resistance, is one of the most popular materials used in micromachining [15].…”

mentioning

confidence: 99%

“…Stainless steel is commonly used in medical applications for realization of various medical devices, implants and surgical instruments. Although highly-priced and difficult to machine, titanium is a valuable asset for micromachining [16]. It is light, heat and corrosion-resistant, biocompatible and inert and has a high strength-to-weight ratio.…”

mentioning

confidence: 99%

Introductory Chapter: Current Trends in Micromachining Technology

Stanimirović,

Stanimirović

2024

Micromachining - New Trends and Applications

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The influence of the crystallographic orientation when micro machining commercially pure titanium: A size effect

Cited by 24 publications

References 49 publications

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Wire-EDM performance and surface integrity of Inconel 718 with unique microstructural features fabricated by laser powder bed fusion

Introductory Chapter: Current Trends in Micromachining Technology

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