Cyclic oxidation of alloy 718 produced by additive manufacturing compared to a wrought-718 alloy

Sanviemvongsak, Tom; Monceau, Daniel; Madelain, Martin; Desgranges, Clara; Smialek, James L.; Macquaire, Bruno

doi:10.1016/j.corsci.2021.109804

Cited by 26 publications

(7 citation statements)

References 36 publications

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“…Pistor et al highlight that differences in segregation between AM samples and Brigdman samples cause substantial changes in oxide layer homogeneity driven by segregation. [13] Furthermore, Julliet et al highlighted how for AM-processed IN718, cation diffusion is arrested whereas the opposite holds true for forged 718; [14] furthermore, it has been shown that small compositional and microstructural differences result in varying levels of degradation-in the form of oxide spallation-when comparing material processed by AM as opposed to conventionally processed, [15] Here, we study 14 different compositions processed in the same manner. These alloys cover a wide compositional space with widely varying equilibrium c 0 volume fraction-illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 91%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

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This body of work aims to inform alloy design for additive manufacturing by investigating the early-stage oxidation behavior of Ni-based superalloys processed by laser-powder bed fusion. The oxidation of 14 Ni-based superalloys—some novel and some heritage—at 1000 °C for 24 hours is studied through thermo-gravimetric analysis. The mass gain, oxide layer thickness, oxide scale composition, and $$\gamma ^\prime $$ γ ′ depletion zone size are measured. The influence of the alloy composition on these variables is assessed in order to elucidate how increasingly processable and oxidation resistant alloys can be developed. The alloy compositions with Al content greater than 9 at. pct form continuous Al2O3 scales at 1000 °C and display markedly lower parabolic rate constants, mass gain, oxide layer thickness, and $$\gamma ^\prime $$ γ ′ depletion zone size. The alloys of lesser Al content have reduced oxidation resistance and formed oxide scales of predominantly Cr2O3. Alloys with Ti content of 2.7 at. pct and greater formed Ti-rich oxide phases in their oxide scales as well as TiN subscale. A trade-off between alloy processability and oxidation resistance is identified, dictated by the deleterious effect of Al content on the ductility dip and the benefit of Al for oxidation resistance. A property space along the pareto front is highlighted which is ideal for having oxidation resistance and processability.

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Section: Introductionmentioning

confidence: 91%

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Utada

Pedraza

Dick-Cleland³

et al. 2022

Metall Mater Trans A

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“…In 2021, Sanviemvongsak 22 showed that the LBM 718 alloy exhibited a highly degraded cyclic oxidation resistance compared to the EBM 718 and the wrought 718 alloys, while these alloys exhibit similar isothermal oxidation behaviors. No explanation could be found in the microstructural differences of the three alloys.…”

Section: Effect Of Chemical Compositionmentioning

confidence: 99%

“…The best behavior is obtained for the forged alloy 718 which has a low S concentration and a lot of Mn (see text). 22 HT heat-treated, P600 ground to P600 paper finish, raw not ground. Fig.…”

Section: Effect Of Microstructure and Chemical Homogeneitymentioning

confidence: 99%

“…33 The roughness also affects the state of stress in the oxide layer and can lead to premature spalling of the oxide layers. 35 During their study on the cyclic oxidation kinetics of alloy 718, Sanviemvongsak et al 22 observed that grinding with P600 paper of the surface of the LBM alloy delayed the catastrophic spallation of oxides during thermal cycles of 1 h at 900°C, but did not prevent it.…”

Section: Effect Of Surface Roughnessmentioning

confidence: 99%

“…The resistance to cyclic oxidation and hot corrosion has been scarcely reported in the literature. [20][21][22] On this subject, special attention must be paid to impurities and minor elements that can affect the adhesion of the oxide layers (S, C, reactive elements, sulfide-forming elements).…”

Section: Summary Of Am Alloy Performance and Conclusionmentioning

confidence: 99%

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High Temperature Oxidation of Additively Manufactured Structural Alloys

Monceau

Vilasi

2022

JOM

Self Cite

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Metal alloys produced by additive manufacturing have specifi c microstruc tures and compositions. Their microstructure is generally out of equilibrium, textured, and inhomogeneities can be observed. They can have pores and nano-inclusions. The contents of volatile elements may deviate from the nominal composition. These alloys often experience signifi cant interna! stresses and present fairly rough surfaces depending on the process used. Hipping these alloys modifies their microstructure and defects. This literature review shows that open porosity can lead to much higher oxidation kinetics than dense materials, with very deep interna! oxide penetrations. Neverthe less, when fabricated with optimized parameters, LBM-or EBM-alloys, such as TA6V, 718, or 316L, can behave as well as, or even better than, wrought alloys. The roughness of the surface is not necessarily problematic, but it can lead to local breakaway phenomena and premature spalling on some alloys. It has been verifi ed that the nature of the grain boundaries strongly affects the intergranular oxidation. The effect of chemical segregations on the protective nature of the outer oxide layer has also been reported. Today, too few studies have been devoted to the effect of raw and pre-oxidized surface states after HIP on cyclic oxidation and on hot corrosion of these alloys.

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Effects of High-Temperature Oxidation on Fatigue Life of Additive-Manufactured Alloy 625

Nope

Wang

Alvarado-Orozco

et al. 2023

The Minerals, Metals &Amp; Materials Series

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Cyclic oxidation of alloy 718 produced by additive manufacturing compared to a wrought-718 alloy

Cited by 26 publications

References 36 publications

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

Alloy Design for Additive Manufacturing: Early-Stage Oxidation of Nickel-Based Superalloys

High Temperature Oxidation of Additively Manufactured Structural Alloys

Effects of High-Temperature Oxidation on Fatigue Life of Additive-Manufactured Alloy 625

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