High-temperature oxidation behavior and mechanism of Inconel 625 super-alloy fabricated by selective laser melting

Sun, Yuzhou; Chen, Lan; Li, Lin; Ren, Xudong

doi:10.1016/j.optlastec.2020.106509

Cited by 39 publications

(6 citation statements)

References 41 publications

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“…Regarding the composition of the oxide scale, the analysis of the X-diffraction spectra of Figure 6 and the energy dispersive X-ray EDX maps presented in Figures 12 and 13, respectively, show that chromia Cr 2 O 3 is the main oxide present favoured the reaction of chromium and oxygen favoured by thermodynamic equilibrium (DG~520 kJ/mol). This information agrees with the ndings of works of Sun et al [11],…”

Section: Discussionsupporting

confidence: 94%

“…Furthermore, they observed that heat-treating of the alloy promoted chromium depletion and precipitation of the δ-Ni 3 Nb phase at the metal-oxide interface and at the grain boundaries, phenomena that enhanced alloy oxidation. Moreover, Sun et al [11] studied the oxidation behaviour at 900°C of Inconel 625® fabricated by Selective Laser Melting (SLM) using different laser energy densities. Like the investigations already revised, they found that the oxide scale formed included chromia Cr 2 O 3 and a mixture of nonprotective Ni-rich oxides formed at non-speci c zones on the surface of the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the high temperature oxidation behaviour of Inconel 625 ® fabricated by additive manufacturing and conventional methods

Pineda-Arriaga

Ramírez-Ramírez

Pérez-González

et al. 2022

Preprint

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The differences between the oxidation behaviour of Inconel 625® superalloy fabricated by additive manufacturing and wrought conditions are presented. At 900 and 1000°C, the oxidation kinetics of the specimens exposed to synthetic dry air followed the parabolic rate law, the activation energy being 174 and 139 kJ/mol for the alloys fabricated by additive manufacturing and wrought conditions, respectively. For both alloys, chromia Cr2O3 was the primary oxide found on the surface of the alloy, together with nodules of NiCr2O4 spinel. Metallographic cross-sections of the specimens revealed the development of alumina Al2O3 and rutile TiO2 as internal oxides. The surface and subsurface oxidation of the alloys depended on their microstructures and the presence of the δ-Ni3Nb phase.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Characterization of the high temperature oxidation behaviour of Inconel 625 ® fabricated by additive manufacturing and conventional methods

Pineda-Arriaga

Ramírez-Ramírez

Pérez-González

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…50 Normally, chemical adsorption occurs between the surface of the specimen and the atmosphere in the furnace. According to Wagner's theory, 51 the oxide layer is formed by selective oxidation of active elements such as Al or Cr. Driven by the elevated temperature, oxygen molecules collide with the specimen and decompose into oxygen atoms.…”

Section: Temperature Effectmentioning

confidence: 99%

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Zhang

et al. 2021

Fatigue Fract Eng Mat Struct

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The tension-tension test with stress ratio 0.1 was conducted to clarify highcycle and very-high-cycle fatigue properties of Ni-based superalloy at 750 C by combining two-and three-dimensional microscopic observations. Results show that as stress level decreases, fatigue failure is less likely to be induced by pore, while the possibility of crystallographic facet-induced failure increases, and finally, the duplex S-N curves are formed. The larger roughness of crack nucleation region is mainly attributed to the geometric incompatibility of grains and the plastic deformation at crack tip. Under the influence of elevated temperature and vacuum environment, the transition size from small crack to long crack is approximately equal to the grain size. Combined with the evaluation of threshold values, the internal failure mechanism is elucidated. Finally, from the viewpoint of energy, a fatigue life prediction model is proposed, and the predicted results are in good agreement with the experimental ones.

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“…[ 13 ] In general, the operating temperature of Hastelloy X alloy is 800–1000 °C, between which reliable mechanical stability and oxidation resistance should be guaranteed. [ 16 ] To date, the works focusing on the mechanical properties of SLM‐fabricated Hastelloy X alloys at room/high temperature have been broadly reported. Nevertheless, there is still a research gap in the oxidation behavior at high temperatures in the air atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Hastelloy X Alloy Fabricated by Selective Laser Melting and Subsequent Hot Isostatic Pressing Treatment

Wang

Liu

et al. 2022

Adv Eng Mater

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Hastelloy X is a typical solid solution strengthening superalloy featured by good tolerance against oxidation and adequate mechanical and creep properties at 900 °C. However, current works about Ni‐based superalloys mainly focus on the relationship between microstructure and mechanical performance at high‐temperature regions, leaving the failure mechanism under the circumstance of oxidation as an open issue. Herein, the effects of the microstructure on the high‐temperature oxidation behavior and mechanical properties of Hastelloy X alloys prepared by selective laser melting (SLM) technique and hot isostatic pressing (HIP), respectively, are investigated. The experimental results show the existence of a large number of microcracks in the SLM samples during oxidation at 900 °C, which can contribute to increased oxidation weight gain and ease of oxide layer exfoliation. With the assistance of HIP, thermal cracks are effectively eliminated by the combination of better elemental homogeneity. The further improvement of oxidation resistance is found to result from the densification of Cr2O3 particles and the hindrance of oxygen diffusion. From the perspective of the application, this work provides valuable support for the explanations of the oxidation resistance and fracture mechanism of Hastelloy X superalloys in high‐temperature service environments.

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High-temperature oxidation behavior and mechanism of Inconel 625 super-alloy fabricated by selective laser melting

Cited by 39 publications

References 41 publications

Characterization of the high temperature oxidation behaviour of Inconel 625 ® fabricated by additive manufacturing and conventional methods

Characterization of the high temperature oxidation behaviour of Inconel 625 ® fabricated by additive manufacturing and conventional methods

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Oxidation Behavior of Hastelloy X Alloy Fabricated by Selective Laser Melting and Subsequent Hot Isostatic Pressing Treatment

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