Influence of heat treatment on the fatigue resistance of Inconel 718 fabricated by selective laser melting (SLM)
TL;DR: In this article, the influence of heat treatment on the fatigue resistance of Inconel 718 (IN718) fabricated by selective laser melting (SLM) and cast and wrought (C&W) process route was investigated.
About: This article is published in Materials Today: Proceedings.The article was published on 2021-01-01. It has received 11 citations till now. The article focuses on the topics: Fatigue limit & Inconel.
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TL;DR: In this paper , the effects of porosity on tensile properties, fatigue life, impact and fracture toughness, creep response, and wear behavior of laser powder bed fusion (LPBF) alloys are reviewed.
Abstract: Abstract Laser powder bed fusion (LPBF) is an emerging additive manufacturing technique that is currently adopted by a number of industries for its ability to directly fabricate complex near-net-shaped components with minimal material wastage. Two major limitations of LPBF, however, are that the process inherently produces components containing some amount of porosity and that fabricated components tend to suffer from poor repeatability. While recent advances have allowed the porosity level to be reduced to a minimum, consistent porosity-free fabrication remains elusive. Therefore, it is important to understand how porosity affects mechanical properties in alloys fabricated this way in order to inform the safe design and application of components. To this aim, this article will review recent literature on the effects of porosity on tensile properties, fatigue life, impact and fracture toughness, creep response, and wear behavior. As the number of alloys that can be fabricated by this technology continues to grow, this overview will mainly focus on four alloys that are commonly fabricated by LPBF—Ti-6Al-4 V, Inconel 718, AISI 316L, and AlSi10Mg.
32 citations
TL;DR: In this article , the effect of surface roughness on the corrosion behavior of 316 L stainless steel manufactured by LPBF has been evaluated and the behavior of the steel in the as-built state was compared to that ground up to 2500 grade.
4 citations
TL;DR: In this paper , the authors investigated the selection of suitable PPs and the influence of SLM PPs on the quality of parts fabricated from different materials and combinations of multi-materials structures.
Abstract: Additive manufacturing (AM) combines materials to create parts from three-dimensional model data, often layer by layer. AM is mainly deployed to fabricate complicated geometrical components with high efficiency and low cost. Selective laser melting (SLM) is an AM method that uses a high-power laser beam to melt powder material layer upon layer completely. Multi-material in SLM is due to its potential for specific applications where different material properties achieve comprehensive performance at different locations of the directly manufactured parts. The process parameters (PP) used in SLM are layer thickness (LT), laser power (LP), hatch spacing (HS), and scanning speed (SS). It mainly impacts the porosity, residual stress, fatigue, surface roughness, density, mechanical properties, and product microstructure. This article investigates the selection of suitable PP’s and the influence of SLM PP’s on the quality of parts fabricated from different materials and combinations of multi-materials structures. Finally, it helps to understand each process parameter of SLM, and the future trends of AM in different areas are concluded.
3 citations
TL;DR: In this paper , additively manufactured AISI 316 L stainless steel samples were heat treated at temperatures from 400 °C to 1100 °C, and the corrosion behavior in chloride environments was electrochemically studied.
3 citations
TL;DR: The interaction of hydrogen with specimens of 316L steel and Inconel 718 alloy processed by selective laser melting (SLM) was studied in this paper , where the effect of hydrogen on the mechanical properties of SLM materials, hydrogen permeability, and microstructure was investigated; besides, these values were compared with the properties of conventional produced materials.
Abstract: The interaction of hydrogen with specimens of 316L steel and Inconel 718 alloy processed by selective laser melting (SLM) was studied. The effect of hydrogen on the mechanical properties of SLM materials, hydrogen permeability, and microstructure was investigated; besides, these values were compared with the properties of conventionally produced materials. It was shown that SLM can be successfully used to produce parts for operation in hydrogen environments at high pressure at room temperature.
2 citations
References
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TL;DR: In this paper, the starting material, manufacturing processes, heat treatment and characterization procedures of mechanical properties are presented, and the microstructure is crucial for the mechanical properties of IN718.
602 citations
17 Sep 2015-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: Inconel 718 superalloy has been fabricated by selective laser melting technology (SLM), and its microstructure and mechanical properties were studied under solution+aging (SA) standard heat treatment, homogenization+solution+solutionsolution + aging (HSA), and as-fabricated conditions as discussed by the authors.
Abstract: Inconel 718 superalloy has been fabricated by selective laser melting technology (SLM). Its microstructure and mechanical properties were studied under solution+aging (SA) standard heat treatment, homogenization+solution+aging (HSA) standard heat treatment and as-fabricated conditions. Precipitated phases and microstructures were examined using OM, SEM, TEM and X-ray analysis methods. The fine dendrite structures with an average dendrite arm spacing of approximately 698 nm accompanying some interdendritic Laves phases and carbide particles can be observed in the as-fabricated materials. After standard heat treatments, dendrite microstructures are substituted by recrystallization grains, and Laves phases also dissolve into the matrix to precipitate strengthening phases and δ particles. The test values of all specimens meet Aerospace Material Specification for cast Inconel 718 alloy, and the transgranular ductile fracture mode exists for the three conditions. The strength and hardness of heat-treated SLM materials increase and are comparable with wrought Inconel 718 alloy, whereas their ductility decreases significantly compared with the as-fabricated material. This is because of the precipitation of fine γˊ and γ〞strengthening phases and needle-like δ phases. For the as-fabricated alloy, the formation of finer dislocated cellular structures that develop into a ductile dimple fracture shows excellent ductility. Due to dislocation pinning from γˊ and γ〞strengthening phases and the impediment of dislocation motion caused by the needle-like δ phases, the ductility of the SA materials decreases and causes a transgranular fracture, compared with the as-fabricated samples.
467 citations
TL;DR: In this paper, an overview over laser-based additive manufacturing with comments on the main steps necessary to build parts to introduce the complexity of the whole process chain is presented. But despite good sales of AM machines, there are still several challenges hindering a broad economic use of AM.
415 citations
TL;DR: In this article, precipitation and dissolution kinetics of the δ-phase were studied in three wrought versions and one spray-formed (SF) version of the nickel alloy, Inconel 718.
382 citations
01 Dec 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: Inconel 718 produced by selective laser melting (SLM) has been characterized with focus on the microstructure, the dependence of sample orientation on the mechanical properties and the effects of post heat treatments as mentioned in this paper.
Abstract: Inconel 718 produced by selective laser melting (SLM) has been characterized with focus on the microstructure, the dependence of sample orientation on the mechanical properties and the effects of post heat treatments. The as-manufactured IN718 has a very fine cellular-dendritic structure with fine Laves phases precipitating in the interdendritic region, and electron backscatter diffraction (EBSD) analysis shows that both the vertically and horizontally built samples have relatively weak texture. The vertically built samples show lower tensile strength but higher ductility than the horizontally built samples, and the mechanism is shown to be partly due to the crystallographic feature but more importantly due to the different amount of residual stress and dislocations accumulated in these two kinds of samples. Applying heat treatments can significantly increase the strength while decrease the ductility correspondingly, and difference in yield strength between the vertically and horizontally built samples decreases with increasing the heat treatment temperatures, mainly due to the removal of residual stress and dislocations.
346 citations