A study of the factors contributing to the metal dusting of Fe–Cr–Ni alloys in highly carburising atmospheres

Maier, M.; Norton, J. F.; Puschek, P.

doi:10.1179/mht.2000.17.2.024

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…The present work aims to improve the metal dusting resistance of Alloy 800H, an iron-nickel base alloy that is widely used and known to be susceptible to metal dusting damage [20][21][22][23][24], by using plasma sprayed coatings, designed to form protective oxide scales. Samples with as-sprayed and laser remelted coatings have been exposed to an environment that causes severe metal dusting of the base alloy.…”

Section: Introductionmentioning

confidence: 99%

The Use of Plasma Sprayed Laser Remelted Corrosion Resistant Metallic Coatings to Inhibit Metal Dusting

Voisey

Liu²,

Zougdani³

et al. 2004

MSF

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Metal dusting is a catastrophic carburisation phenomenon that occurs in carbon-rich atmospheres at temperatures between 450°C and 850°C, conditions encountered in steam reforming and similar processes. Material loss occurs as the bulk metal is converted into fine particles via the deposition of carbon and subsequent growth of graphite.The present research is intended to examine the potential of plasma sprayed corrosion resistant coatings (NiCrAlY and 50:50 Ni:Cr) to improve the metal dusting resistance of Alloy 800H. In addition, a CO 2 laser has been used to remelt the as-sprayed coated layer. This laser treatment has several aims: to consolidate the coated layer by eliminating porosity from the as-sprayed structure, to refine the microstructure and, thus, enhance diffusion of chromium and aluminium to the surface to aid the formation of protective oxides and to improve adhesion of the coating to the substrate.Coated, uncoated and laser remelted coated samples have been exposed to a mixed gas environment of 80%CO, 20%H 2 at 650°C and inspected at intervals. The extents of degradation have been estimated by weight change data while the damaged surfaces have been characterised by optical and scanning electron microscopy / energy dispersive X-ray analysis in plan and cross section. The results are discussed in terms of improvements to corrosion resistance in this essentially metal dusting environment.

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Section: Introductionmentioning

confidence: 99%

The Use of Plasma Sprayed Laser Remelted Corrosion Resistant Metallic Coatings to Inhibit Metal Dusting

Voisey

Liu²,

Zougdani³

et al. 2004

MSF

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“…It is well-known that an oxide scale is enhanced on a mechanically deformed subsurface. [11][12][13][14][15]26,32,[44][45][46][47] In the study by Gheno et al [57] it was shown in detail, that the severely deformed subsurface regions from polishing are more important to the diffusion of chromium than the bulk. It was concluded from the oxidation at 550°C in air of an annealed Ni-30 wt% Cr alloy, that grain boundary diffusion in the deformed and recrystallized (during exposure) subsurface region is the determining mechanism for oxide scale formation, before dislocation diffusion and bulk diffusion.…”

Section: Variation Between the Front And Back Of A Samplementioning

confidence: 99%

“…[4][5][6][7] The influence of the composition of wrought alloys has been studied in various papers. [9,11,12,14,16,[26][27][28][31][32][33][34][35][36][37][38][39] It is related to the ability of the alloy to form a protective oxide scale on its surface. High chromium, aluminum, or silicon content improves the resistance of an alloy against metal dusting.…”

Section: Introductionmentioning

confidence: 99%

“…[26,28,[40][41][42][43] In addition, there are influences of surface treatments on metal dusting corrosion such as pickling, grinding, machining and grain size. [9,[11][12][13][14][15]26,32,[44][45][46][47][48] In the study by Hattendorf et al, [47] samples of alloy 602 CA with the same surface finish (ground to 600 grit) and 40 μm grain size show a lower maximum pit depth, a smaller pit size, fewer pits and a lower mass loss than samples with 85 μm grain size after 7750-h exposure in a 37% CO, 7% CO 2 , 46% H 2 , 9% H 2 O atmosphere at 600°C and 20 bar (see sample 152A-2 and 150A-2 in Table 1). Unluckily these samples were from different heats and different production routes.…”

Section: Introductionmentioning

confidence: 99%

“…[ 26,28,40‐43 ] In addition, there are influences of surface treatments on metal dusting corrosion such as pickling, grinding, machining and grain size. [ 9,11‐15,26,32,44‐48 ]…”

Section: Introductionmentioning

confidence: 99%

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Influence of sample thickness and microstructure on metal dusting behavior of NiCrFeAl alloys

Hattendorf,

Hermse,

IJzerman

2024

Materials & Corrosion

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Samples of alloy 601, 602 CA and 602 MCA with different thickness and microstructure, all 600 grit laboratory ground, are compared. All samples are exposed to up to 5693 h at 600°C in a metal dusting producing atmosphere with a total pressure of 20 bar. A smaller sample thickness leads to an increased pit density for alloy 601 and an increased pit density, a longer incubation time and an increased pit depth growth rate for alloy 602 CA. This is attributed to lower stresses in the scale of the thinner samples. Grain size effects of the substrate are probably concealed by the deformed and recrystallized subsurface due to the 600 grit finish of the samples. If carbides are unavoidable in an alloy, they should be small, as they can serve as chromium suppliers during scale formation better than larger ones. They increase incubation time and pit depth growth rate.

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Influence of surface treatment on the metal dusting behavior of alloy 699 XA

White

Schlereth

Lepple

et al. 2022

Materials & Corrosion

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Metal dusting attack is a serious problem in processing industries using carbonaceous gases and high temperatures. Ni-based alloy 699 XA was recently developed as an alloy for these types of environments with high resistance against metal dusting. In this study, different surface treatments of this chromium-and aluminum-rich alloy are shown to have an important influence on the metal dusting onset behavior. It was found that surface treatments that are traditionally considered to be helpful for fatigue performance, for example, shot peening, and pickling were detrimental to the metal dusting performance of alloy 699 XA.Additionally, the shot peening surface treatment promoted Fe surface contamination, resulting in a negative impact on the metal dusting pitting resistance of the alloy. Deformation accompanied by apparent BCC α-Cr precipitation in the bulk microstructure, but a comparison with cold-rolled materials shows that the surface treatment dominates the metal dusting resistance.

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A study of the factors contributing to the metal dusting of Fe–Cr–Ni alloys in highly carburising atmospheres

Cited by 10 publications

References 7 publications

The Use of Plasma Sprayed Laser Remelted Corrosion Resistant Metallic Coatings to Inhibit Metal Dusting

The Use of Plasma Sprayed Laser Remelted Corrosion Resistant Metallic Coatings to Inhibit Metal Dusting

Influence of sample thickness and microstructure on metal dusting behavior of NiCrFeAl alloys

Influence of surface treatment on the metal dusting behavior of alloy 699 XA

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