Fatigue crack growth behavior of Inconel 718 produced by selective laser melting

Konečná, Radomila; Kunz, Ludvík; Nicoletto, Gianni; Bača, Adrián

doi:10.3221/igf-esis.35.04

Cited by 18 publications

(12 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Elongated grains (i.e. columnar)typically form duringthe AM process in the direction of solidification, which tends to be near-parallel with building direction [12,16,37,57]. In case of loading being perpendicular to the building direction (i.e.…”

Section: Effect Of Build Orientationmentioning

confidence: 99%

Additive manufacturing of fatigue resistant materials: Challenges and opportunities

Yadollahi

Shamsaei

2017

International Journal of Fatigue

739

343

View full text Add to dashboard Cite

This overview article focuses on the current state of knowledge pertaining to the mechanical characteristics of metallic parts fabricated via additive manufacturing (AM), as well as the ongoing challenges and imminent opportunities in fabricating more fatigue resistant materials.Current experimental evidence suggests that the mechanical properties of laboratory AM specimens may not be representative ofthose associated with parts, due primarily to differences in geometry/size which influence the thermal histories experienced during fabrication, and consequently, microstructural features, surface roughness and more. In addition, standards for mechanical testing methods, specimen design procedures, post-manufacturing treatments, etc., may need to be revisedfor AM parts. Standardizing the AM processmay only be accomplished by strengthening the current understanding of the interrelationships among process parameters, thermal history, solidification, resultant microstructure, and mechanicalbehavior ofthe part.Having the ability to predict variation in mechanical behavior based on resultant microstructure, or matching the best conceivable properties of a part in accordance with the loading critical plane,are some possible solutionsfor making AM a more reliable means for producing functional parts. Developingmicrostructure-property modelsis arguably the first, necessary step towarddesign optimization and the more efficient, accurate estimation of the structural integrity ofAM parts.

show abstract

Section: Effect Of Build Orientationmentioning

confidence: 99%

Additive manufacturing of fatigue resistant materials: Challenges and opportunities

Yadollahi

Shamsaei

2017

International Journal of Fatigue

739

343

View full text Add to dashboard Cite

show abstract

“…It can be reduced through the use of additive technologies, in particular, based on selective laser melting (SLM). However, multiple cycles of heating and cooling with fast solidification during SLM lead to formation of a microheterogeneous microstructure with an increased dislocation density and precipitations of dispersed hardening phases including small carbides and oxides [1][2][3][4][5][6][7][8][9][10][11][12] that can negatively affect mechanical and service properties of the Inconel 718 superalloy. It is also known that the material obtained by SLM can have pores [13 -17].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of the Inconel 718 superalloy manufactured by selective laser melting

et al. 2019

View full text Add to dashboard Cite

The work is devoted to the study of the microstructure and mechanical properties of the nickel base superalloy Inconel 718 manufactured by selective laser melting (SLM). Multiple cycles of heating and cooling during SLM led to the formation of a complex microheterogeneous microstructure. The microstructure of the superalloy manufactured by SLM consisted of elongated γ grains with a transversal size of 10 -100 μm and a longitudinal size of 50 -300 μm, which in its turn consisted of columnar and equiaxed subgrains. Stable and metastable precipitates of the δ-Ni 3 Nb and γ''-Ni 3 Nb phases, carbides and probably oxides, were detected along the subboundaries. The standard heat treatment of the superalloy manufactured by SLM resulted in a partial dissolution of the δ phase and the metastable γ'' phase during solid solution treatment and precipitation of the dispersed metastable γ'' phase during ageing. The microstructure characterization performed by electron backscatter diffraction technique (EBSD analysis) revealed that the size and elongated form of the γ grains was not changed after the heat treatment, the size of the subgrains slightly increased, the fraction of low-angle boundaries (subboundaries) decreased, and the fraction of high-angle grain boundaries increased. Tensile tests were carried out at T = 20 -700°C for the superalloy samples subjected to standard heat treatment. The tensile direction was parallel to the building direction. The tensile tests showed that the superalloy manufactured by SLM exceeded the requirements of the AMS 5662 certificate for the superalloy Inconel 718 in a hot forged condition subjected to standard heat treatment.

show abstract

“…The material should undergo heat treatment process to get desired grain size, reduces porosity, improve the density and tensile strength. Konecna et al [18] compared the SLM manufactured over conventional by manufactured IN718 alloy to report the crack growth of the alloy on mechanical condition. Probstle et al [19] treated SLM alloy have high creep strength when compared to wrought material.…”

Section: Additive Manufacturing Materialsmentioning

confidence: 99%

Comprehensive report on Materials for Gas Turbine Engine Components

2019

IJITEE

View full text Add to dashboard Cite

In the past three decades, it is very challenging for the researchers to design and development a best gas turbine engine component. Engine component has to face different operating conditions at different working environments. Nickel based superalloys are the best material to design turbine components. Inconel 718, Inconel 617, Hastelloy, Monel and Udimet are the common material used for turbine components. Directional solidification is one of the conventional casting routes followed to develop turbine blades. It is also reported that the raw materials are heat treated / age hardened to enrich the desired properties of the material implementation. Accordingly they are highly susceptible to mechanical and thermal stresses while operating. The hot section of the turbine components will experience repeated thermal stress. The halides in the combination of sulfur, chlorides and vanadate are deposited as molten salt on the surface of the turbine blade. On prolonged exposure the surface of the turbine blade starts to peel as an oxide scale. Microscopic images are the supportive results to compare the surface morphology after complete oxidation / corrosion studies. The spectroscopic results are useful to identify the elemental analysis over oxides formed. The predominant oxides observed are NiO, Cr2O3, Fe2O3 and NiCr2O4. These oxides are vulnerable on prolonged exposure and according to PB ratio the passivation are very less. In recent research, the invention on nickel based superalloys turbine blades produced through other advanced manufacturing process is also compared. A summary was made through comparing the conventional material and advanced materials performance of turbine blade material for high temperature performance.

show abstract

Fatigue crack growth behavior of Inconel 718 produced by selective laser melting

Cited by 18 publications

References 17 publications

Additive manufacturing of fatigue resistant materials: Challenges and opportunities

Additive manufacturing of fatigue resistant materials: Challenges and opportunities

Microstructure and mechanical properties of the Inconel 718 superalloy manufactured by selective laser melting

Comprehensive report on Materials for Gas Turbine Engine Components

Contact Info

Product

Resources

About