Anisotropic tensile behavior of in situ precipitation strengthened Inconel 718 fabricated by additive manufacturing

Ni, Mang; Chen, Chao; Wang, Xiaojun; Wang, Pengwei; Li, Ruidi; Zhang, Xiaoyong; Zhou, Kechao

doi:10.1016/j.msea.2017.06.098

Cited by 323 publications

(104 citation statements)

References 27 publications

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“…There are much more grain boundaries is perpendicular to the build axis for specimens at 90°than parallel to the build axis for specimens at 0°. Other studies have observed the same difference [12,41]. Heat treatment played a perfect role in enhancing mainly the mechanical characteristics by precipitation of the ′ γ and ″ γ phases.…”

Section: Tensile Propertiesmentioning

confidence: 53%

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: Tensile Propertiesmentioning

confidence: 53%

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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show abstract

“…In order to control the final mechanical property, the as-deposited microstructure and the following heat treatment process have become an important issue [7,8]. Mang et al [9] believed that the precipitates existing in the SLMed IN718 should be 75% γ,17% γ ', and 7% γ . Often the γ is distributed in the subgrain boundary, and the γ" is uniformly distributed in the whole section, whose strengthening effect is supposed to be the main reason that the mechanical property is higher than the cast IN718; Y. Tian et al [10] found that the deposited SLMed samples with cellular dendrite structure mainly precipitates the Laves phases in microscale and NbC in nanoscale, no γ and γ" have been tracked due to the high cooling rate, and after heat treatment, recrystallization occurs, making the needle-like shape δ precipitated.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

Cao

Bai

Liu

et al. 2019

Metals

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The microstructure and precipitates of INCONEL 718 alloy (IN718) fabricated by selective laser melting (SLM) are investigated. The matrix is comprised of the elongated γ grains along Z direction, tilting a few degrees. The microstructure mainly consists of a cellular–columnar structure with fine first dendrite arm space of 1–1.5 µm originated from the rapid solidification rate locally. The precipitates of the SLMed IN718 are confirmed to be a significant amount of Laves in the form of irregular bulk distribution, small amount of carbonitride and spherical Al2O3 particles in nanoscale. Some of the carbonitrides grow separately and some of the carbonitrides enwrap the Al2O3 fully or partly, forming the shell structure of the Al2O3–carbonitride. The reheating effect from the following layers to the previous layers have not reached the solid-state transformation temperature of the γ′ and γ″.

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“…Zhou et al 8 investigated the effect of texture on low-cycle fatigue of Inconel 718. Along with other studies on the microstructure of LPBF Inconel 718, [9][10][11] they found that the as-built microstructure consists of a predominantly columnar grain structure parallel to the build direction. This structure will result in an anisotropic mechanical response, making the fatigue life dependent on build orientation in addition to internal and external defects.…”

Section: Introductionmentioning

confidence: 63%

High cycle fatigue life estimation of materials processed by laser powder bed fusion

Hovig

Azar

Sunding

et al. 2019

Fatigue Fract Eng Mat Struct

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The fatigue life of metal components is known to depend on the surface topography. For components made by laser powder bed fusion, the roughness of the as‐built surfaces depends on the orientation of the component surface with respect to the build plate. Surface topographies of AlSi10Mg and Inconel 718 specimens built at 0° to 90° inclination, with 15° increments, were characterised by white light interferometry. Two methods for calculating the stress concentration factor using the surface roughness data are proposed, and the results of each approach are presented and compared. Moreover, a finite element model was developed, in order to analyse the stress field when subsurface porosity is present. The fatigue lifetime estimates suggest that the lifetime of components may differ up to two orders of magnitude, depending on the build orientation.

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Anisotropic tensile behavior of in situ precipitation strengthened Inconel 718 fabricated by additive manufacturing

Cited by 323 publications

References 27 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

Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

High cycle fatigue life estimation of materials processed by laser powder bed fusion

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