Hot isostatic pressing of IN718 components manufactured by selective laser melting

Tillmann, Wolfgang; Schaak, C.; Nellesen, J.; Schaper, Mirko; Aydinöz, M.E.; Hoyer, Kay-Peter

doi:10.1016/j.addma.2016.11.006

Cited by 182 publications

(91 citation statements)

References 25 publications

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“…All these types of pores were observed on the three planes. Tillmann et al [18] showed the presence of argon in the spherical pores with a slightly greater mean Ar content of 0.3 ppm in Inconel 718 specimens obtained by SLM. They suggest that even if the measured value seems to be very low, the Ar trapped in the structure may have a major influence on the mechanical properties and post-treatment.…”

Section: As-deposited By Slmmentioning

confidence: 97%

“…HIP is mainly used to reduce porosity. However, Tillmann et al [18] observe that HIP also modifies the microstructure of SLM Inconel 718: the microstructure no longer resembles the typical microstructure obtained by SLM, the grains are bigger, and they no longer have an orientation along the build axis. Solution treatment causes the transformation of one or more constituents into a solid solution and, by rapid cooling, these constituents are kept in that solution.…”

Section: Slm Plus Hip and Heat Treatmentmentioning

confidence: 99%

“…Hot Isostatic Pressing (HIP) is one post-treatment that combines a high temperature and strong pressure to reduce the porosity level. Studies have shown the beneficial effect of HIP on the porosity level (HIP at 1150°C -100 MPa: density varying between 99.985% and 99.989%) [18,19]. After HIP, ageing heat treatment is generally recommended for Inconel 718: 720°C for 8 h and 620°C for ⁎ Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties

Moussaoui

Rubio

Mousseigne

et al. 2018

Materials Science and Engineering: A

287

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A B S T R A C TThe effect of SLM parameters on porosity, microstructure and mechanical properties is studied. To this purpose, the Selective Laser Melting (SLM) technology is applied to manufacture Inconel 718 specimens. The material, the manufacturing process, the Hot Isostatic Pressure (HIP), heat treatment, observation procedures and characterisation of mechanical properties are presented. A columnar-dendritic microstructure was observed on all the SLM specimens and a Volumetric Energy Density (VED) effect on the latter was also noted. The rate of porosity varies in relation to the VED and is considerably reduced after HIP. The heat treatment erases the dendritic microstructure, significantly enhances microhardness and confers on the alloy tensile mechanical properties comparable to forged Inconel 718.

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Section: As-deposited By Slmmentioning

confidence: 97%

Section: Slm Plus Hip and Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties

Moussaoui

Rubio

Mousseigne

et al. 2018

Materials Science and Engineering: A

287

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“…However, post-processing can add to the time required to produce the parts and dramatically increase the cost, while the post-processing itself may not fully remove the stresses and may expose them, destroying the part in the process. The normal forms of post-processing for SLM/DMLS are heat treatment and hot isostatic pressing (HIP) [106][107][108][109][110][111][112][113][114][115][116], but methods such as shot-peening have been successfully used, as well [117].…”

Section: Part Post-processingmentioning

confidence: 99%

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

2017

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Abstract:A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal laser sintering (DMLS) process. SLM/DMLS can produce full-density metal parts from difficult materials, but it tends to suffer from severe residual stresses introduced during processing. This limits the usefulness and applicability of the process, particularly in the fabrication of parts with delicate overhanging and protruding features. The purpose of this study was to examine the current insight and progress made toward understanding and eliminating the problem in overhanging and protruding structures. To accomplish this, a survey of the literature was undertaken, focusing on process modeling (general, heat transfer, stress and distortion and material models), direct process control (input and environmental control, hardware-in-the-loop monitoring, parameter optimization and post-processing), experiment development (methods for evaluation, optical and mechanical process monitoring, imaging and design-of-experiments), support structure optimization and overhang feature design; approximately 143 published works were examined. The major findings of this study were that a small minority of the literature on SLM/DMLS deals explicitly with the overhanging stress problem, but some fundamental work has been done on the problem. Implications, needs and potential future research directions are discussed in-depth in light of the present review.

show abstract

“…However, post processing can add to the time required to produce the parts and dramatically increase the cost, while the post-processing itself may not fully remove the stresses and may expose them, destroying the part in the process. The normal forms of post-processing for SLM/DMLS are heat treatment and hot isostatic pressing (HIP) [105][106][107][108][109][110][111][112][113][114].…”

Section: Part Post-processingmentioning

confidence: 99%

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

Patterson¹,

Messimer²,

Farrington³

2017

Preprint

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A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal laser sintering (DMLS) process. SLM/DMLS can produce fulldensity metal parts from difficult materials, but it tends to suffer from severe residual stresses introduced during processing. This limits the usefulness and applicability of the process, particularly in the fabrication of parts with delicate overhanging and protruding features. The purpose of this study was to examine the current insight and progress made toward understanding and eliminating the problem in overhanging and protruding structures. To accomplish this, a survey of literature was undertaken, focusing on process modeling (general, heat transfer, stress and distortion, and material models), direct process control (input and environmental control, hardware-in-the-loop monitoring, parameter optimization, and post-processing), experiment development (methods for evaluation, optical and mechanical process monitoring, imaging, and design-of-experiments), support structure optimization, and overhang feature design; approximately 140 published works were examined. The major findings of this study were that a small minority of the literature on SLM/DMLS deals explicitly with the overhanging stress problem, but some fundamental work has been done on the problem. Implications, needs, and potential future research directions are discussed in-depth in light of the present review.

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Hot isostatic pressing of IN718 components manufactured by selective laser melting

Cited by 182 publications

References 25 publications

Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties

Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

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