Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing

Kuo, Yen-Ling; Horikawa, Shota; Kakehi, Koji

doi:10.1016/j.scriptamat.2016.10.035

Cited by 183 publications

(63 citation statements)

References 23 publications

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“…Thus, AM materials present columnar grains parallel to the build direction in LBM [24,25] and EBM processes both [26,27]. The thermal gradient induces epitaxial solidification leading to fine columnar grain architecture and dendrite epitaxial growth inside those grains, both structures are found parallel to the beam direction [28,29]. The formation of dendrites causes the segregation of alloy elements, such as niobium or titanium along interdendritic regions [30].…”

Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

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A B S T R A C TThe oxidation behaviour of IN 718 alloys produced by laser beam melting and electron beam melting was compared to that of the wrought alloy at 850°C in laboratory air. Oxide scales of all alloys were similar in nature and morphology with small differences due to powder particles sintered on the surface of additive manufacturing parts. Nevertheless, major differences in surface topography were noticed, these could affect surface area estimations and consequentlymass gain estimations. A quantitative correlation was determined between apparent parabolic rate constant and surface area.

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Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

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“…Unlike IN625 alloy, LPBF IN718 alloy, as a precipitation-hardened alloy with a higher mechanical resistance at elevated temperatures [25], has been covered by many studies [26][27][28][29][30]. It was shown that LPBF IN718 alloy manifested a high build-orientation-related anisotropy of its creep properties, caused by preferentially oriented distributions of dendrites and precipitations formed during LPBF processing [26]. Furthermore, the application of the solution (980 • C, 1 h) and aging (718 • C/8 h + 621 • C/10 h) heat treatments recommended by the AMS5662 specifications for forged and welded IN6718 alloy to the LPBF IN718 alloy led to lower creep rupture times, compared to the as-built state [26].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that LPBF IN718 alloy manifested a high build-orientation-related anisotropy of its creep properties, caused by preferentially oriented distributions of dendrites and precipitations formed during LPBF processing [26]. Furthermore, the application of the solution (980 • C, 1 h) and aging (718 • C/8 h + 621 • C/10 h) heat treatments recommended by the AMS5662 specifications for forged and welded IN6718 alloy to the LPBF IN718 alloy led to lower creep rupture times, compared to the as-built state [26]. It was shown that this property degradation stems from the replacement of particle-shaped δ phase precipitates located in the interdendritic regions of the as-built alloy by needle-shaped δ phase precipitates located in the equiaxed structure of the solution-treated and aged alloy.…”

Section: Introductionmentioning

confidence: 99%

Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

Kreitcberg

Inaekyan

Turenne

et al. 2019

JMMP

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The microstructure and mechanical properties of IN625 alloy processed by laser powder bed fusion (LPBF) and then subjected to stress relief annealing, high temperature solution treatment, and hot isostatic pressing were studied. Tensile testing to failure was carried out in the 25-871 • C temperature range. Creep testing was conducted at 760 • C under 0.5-0.9 yield stress conditions. The results of the present study provided valuable insights into the static and creep properties of LPBF IN625 alloy, as compared to a wrought annealed alloy of similar composition. It was shown that at temperatures below 538 • C, the mechanical resistance and elongation to failure of the LPBF alloy were similar to those of its wrought counterpart, whereas at higher temperatures, the elongation to failure of the LPBF alloy became significantly lower than that of the wrought alloy. The solution-treated LPBF alloy exhibited significantly improved creep properties at 760 • C as compared to the wrought annealed alloy, especially under intermediate and low levels of stress.

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“…Additive manufacturing (AM) technologies have made quite a name for themselves in recent years largely due to their capability to produce complex geometries from computer-aided design (CAD) data. A wide variety of commercial AM techniques are currently available that make use of different materials to produce parts [1][2][3][4][5]. AM processes kept evolving with time and started using other materials than the ones initially intended for their use.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modelling and Validation of Thermomechanical Behaviour for Layered Aluminium Parts Made by Composite Metal Foil Manufacturing

Butt¹,

Ghorabian²,

Ahmed³

et al. 2018

J. Compos. Sci.

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The paper presents finite element modelling and thermomechanical analysis on the tensile properties of layered aluminium 1050 metal foil parts made by composite metal foil manufacturing. In this paper, a three-dimensional finite element model was developed and validated through experiments to analyse thermal effects on the tensile properties of 200-μm-thick aluminium 1050 metal foils. The effects of thermal stress and strain were studied by carrying out transient thermal analysis on the heated plates used to join the 200-μm-thick metal foils together using a special brazing paste. A standard tensile test at ambient temperature was carried out on the resulting layered dog bone specimens to analyse the thermal effects on the individual layers of metal. The investigations were precisely designed to assess the effect of heat provided amid the brazing operation to join the metal thwarts together as a layered structure and whether it assumed a part in affecting the tensile properties of the final products when contrasted to a solid aluminium 1050 dog bone specimen of the same dimensions. Corrosion testing was also carried out on dog bone specimens made from varying thickness foils (50 μm, 100 μm, and 200 μm) of aluminium 1050 to assess the effect of corrosion on the tensile strength and elongation. The results showed that the specimens did not face the problem of galvanic corrosion of the foil–bond interface. Microstructural analysis was also carried out to analyse the fracture modes of the tested specimens after corrosion testing.

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Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing

Cited by 183 publications

References 23 publications

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

Finite Element Modelling and Validation of Thermomechanical Behaviour for Layered Aluminium Parts Made by Composite Metal Foil Manufacturing

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