Mechanical properties of additive manufactured nickel alloy 625

Hack, Harvey P.; Link, Richard E.; Knudsen, Erik; Baker, B.W.; Olig, Scott

doi:10.1016/j.addma.2017.02.004

Cited by 35 publications

(26 citation statements)

References 10 publications

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“…Due to its excellent weldability, Alloy 625 is an excellent candidate for the now-well-known Laser Powder Bed Fusion (LPBF) process or otherwise known as Selective Laser Melting (SLM). A large number of studies have addressed different aspects of the fabrication of Alloy 625 by SLM from microstructure optimization to mechanical responses [10][11][12][13][14]. Strength and ductility in particular are critical mechanical properties for structural applications and have therefore been studied accordingly.…”

Section: Introductionmentioning

confidence: 99%

Heat treatments design for superior high-temperature tensile properties of Alloy 625 produced by selective laser melting

Lee

Terner

Jun

et al. 2020

Materials Science and Engineering: A

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The popular superalloy Alloy 625 was produced by Selective Laser Melting (SLM) and post-processing heat treatments were designed to optimize the inhomogeneous and constrained as-built microstructure (AB) for high temperature structural applications. A single-step solution heat treatment (RX) was designed to promote full recrystallization and approach the conventional wrought microstructure. To enhance high temperature properties, a grain boundary serration heat treatment (GBS) was successfully designed involving higher solution temperature and time to promote recrystallization and homogeneity, and a direct slow cooling step followed by a short aging to assist solute diffusion and grain boundary motion. The resulting microstructures were characterized by fully recrystallized fine equiaxed grains and fine intra and intergranular NbC precipitates. The GBS alloy also exhibited as much as 80% of serrated grain boundaries with enhanced resistance to cracking at high temperatures. Tensile properties of all three materials were evaluated at room temperature, 500 � C, 600 � C and 700 � C and compared with their conventional solutionized wrought Alloy 625 counterpart (Wrought). While the AB material exhibited high strength and low ductility, due for the most part to the high density of tangled dislocations resulting from SLM, both RX and GBS alloys showed tensile properties comparable to the conventional wrought material, higher strength in particular. At all temperatures, all four alloys exhibited yield strength values well over 200 MPa. Due to significantly different microstructures, deformation and fracture behaviors were different. While Wrought clearly presented irregular plastic flow at elevated temperatures typically attributed to dynamic strain aging (DSA), the materials produced by SLM and moreover those subjected to postprocessing heat treatments exhibited more stable plastic deformation. The results and characterization reported in the present article highlight the predominant role of microstructure and outstanding potential of SLMed Alloy 625.

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Section: Introductionmentioning

confidence: 99%

Heat treatments design for superior high-temperature tensile properties of Alloy 625 produced by selective laser melting

Lee

Terner

Jun

et al. 2020

Materials Science and Engineering: A

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“…An excellent combination of outstanding corrosion resistance and superior creep resistance, as well as the relatively high tensile strength of nickel-based IN625 alloy (up to 600 • C), make it an interesting choice for aerospace applications. It has been shown that post-processing annealing of LPBF IN625 alloy can significantly improve its room temperature ductility as compared to its as-built state [13,[19][20][21]. However, the assessment of mechanical properties cannot solely be limited to room temperature testing, especially for materials dedicated for service at elevated temperatures.…”

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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“…Although superior tensile strength was observed compared to the wrought product, research on the tensile property of Inconel 625 by SLM showed the presence of anisotropy [108]. Horizontally built samples are reported to have higher tensile strength than vertically built samples [76].…”

Section: Resultsmentioning

confidence: 98%

Microstructure and mechanical properties of selective laser melted superalloy inconel 625.

Anam¹

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Mechanical properties of additive manufactured nickel alloy 625

Cited by 35 publications

References 10 publications

Heat treatments design for superior high-temperature tensile properties of Alloy 625 produced by selective laser melting

Heat treatments design for superior high-temperature tensile properties of Alloy 625 produced by selective laser melting

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

Microstructure and mechanical properties of selective laser melted superalloy inconel 625.

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