Experimental study of micromilling selective laser melted Inconel 718 superalloy

Sadiq, Muhammed A.; Hoang, Nghi M.; Valencia, Nicholas; Obeidat, Suleiman; Hung, Wayne

doi:10.1016/j.promfg.2018.07.129

Cited by 23 publications

(6 citation statements)

References 18 publications

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“…The arithmetic surface roughness Ra of SLM surface can be decreased 92% after turning [60]. Micromilling technique was also studied for machining SLM IN718; at optimal speed and feed a surface roughness of as-printed specimen was reduced from 17 to 1-2 µm Ra [39]. Tool wear is high when machining the wrought IN718 due to the material high hardness and low thermal conductivity of IN718.…”

Section: Inconel 718mentioning

confidence: 99%

“…The tool coating AlTiN-Si3N4 was found to be effective when micromilling SLM IN718 in minimum quantity lubrication at 14 m/min cutting speed and 1.2 µm/tooth feed, however, the coating may be damaged when cutting and smearing the hard slags and brittle Laves particles (Figure 24). Although HIP'ing improves fatigue life by closing gas-filled pores it significantly reduces the tool life due to the forming of hard carbide and precipitates during HIP'ing [39]. While eliminating surface defects and improving surface roughness, the finish machining step helps to achieve part features for required dimensional and form accuracy.…”

Section: Inconel 718mentioning

confidence: 99%

“…Figure23. Material defects that affect machining of SLM IN718: (1) unmelted powder at surface, (2) brittle Laves phase, and (3) burr covered pore[39].…”

mentioning

confidence: 99%

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Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Balasubramanian

Philpott²,

Hyder³

et al. 2020

IJEMM

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Additive Manufacturing (AM) of metallic components shows unfavorable properties in their as-built state; surface roughness, anisotropy, residual stresses, and internal /surface defects are common issues that affect dynamic properties of AM metals. This paper reviews traditional fatigue testing techniques, summarizes published fatigue data for wrought and additively manufactured metals with focus on Inconel 718. Surface and volume defects of AM metals were presented and how post processing techniques could improve fatigue performance were shown. Different methods for normalizing fatigue data were explored due to varying results of different fatigue testing techniques.

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Section: Inconel 718mentioning

confidence: 99%

Section: Inconel 718mentioning

confidence: 99%

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Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Balasubramanian

Philpott²,

Hyder³

et al. 2020

IJEMM

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show abstract

“…These post processing operations could include machining, buffing, grinding, lapping, chemical mechanical planarizing (CMP), magnetic particle polishing and electrochemical polishing (ECP). Finish machining of IN 718 can reduce the as-printed surface finish from 17-20 µm to about 1.5 µm Sa but at the expense of tool wear [4]. Another preliminary study showed that buffing can produce a submicron surface finish but corners and specimen details could be indiscriminately polished.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Polishing of Extruded and Laser Powder-Bed-Fused Inconel 718

Jain

Hyder²,

Corliss³

et al. 2021

IJEMM

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Electro-chemical polishing (ECP) was utilized to produce sub-micron surface finish on Inconel 718 parts manufactured by Laser Powder-Bed-Fusion (L-PBF) and extrusion methods. The L-PBF parts had very rough surfaces due to semi-welded powder particles, surface defects, and difference layer steps that were generally not found on surfaces of extruded and machined components. This study compared the results of electro-polishing of these differently manufactured parts under the same conditions. Titanium electrode was used with an acid-based electrolyte to polish both the specimens at different combinations of pulsed current density, duty cycle, and polishing time. Digital 3D optical profiler was used to assess the surface finish, while optical and scanning electron microscopy was utilized to observe the microstructure of polished specimens. At optimal condition, the ECP successfully reduced the surface of L-PBF part from 17 Âµm to 0.25 Âµm; further polishing did not improve the surface finish due to different removal rates of micro-leveled pores, cracks, nonconductive phases, and carbide particles in 3D-printed Inconel 718. The microstructure of extruded materials was uniform and free of processing defects, therefore can be polished consistently to 0.20 Âµm. Over-polishing of extruded material could improve its surface finish, but not for the L-PBF material due to defects and the surrounding micro-strain.

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“…Application of Coating materials. TiNAl Not Reported[78,79], PVD[80] AISI 1045 steel[78], austenitic stainless steel (X5CrNi18-10)[80], AISI D2 (∼62 HRC) Hardened Steel [79] 4AlTiN RPDCUMS PVD[80,81] Not Reported[28,44,[82][83][84][85][86][87][88][89][90][91] Nimonic 75[88], super duplex stainless steel (UNS S32750)[92], Ti-6Al-4 V[44,93], Inconel 718[81], AA 6262-…”

mentioning

confidence: 99%

Micro tool design and fabrication: A review

Oliaei

Karpat

Davim

et al. 2018

Journal of Manufacturing Processes

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Mechanical micromachining is considered as a cost-effective and efficient fabrication technique to produce three dimensional features and free-form surfaces from various engineering materials. Micro cutting tools are an essential part of mechanical micromachining and they are exposed to harsh conditions which reduces tool life and adversely affect the economics of the process. The challenge is therefore to maintain the tool rigidity and cutting edge sharpness for extended period of time. Thus, the design, fabrication and durability of micro cutting tools are of significant importance for successful micromachining operations. This review paper aims to provide a comprehensive understanding about the capabilities, characteristics, and limitations of different fabrication techniques used in the manufacturing of micro cutting tools. State-of-the-art micro cutting tool design and coating technology has been presented for various micromachining applications. Possible future research direction and development in the field of micro tool design and fabrication has also been discussed.

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Experimental study of micromilling selective laser melted Inconel 718 superalloy

Cited by 23 publications

References 18 publications

Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Electrochemical Polishing of Extruded and Laser Powder-Bed-Fused Inconel 718

Micro tool design and fabrication: A review

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