scholarly journals Microstructural characterization of the protective oxide scale forming on Ni–25Cr–xMn (x = 0.5, 1 and 1.5% wt) in a 200 Pa O2 environment at 1050 °C

2020 ◽  
Vol 178 ◽  
pp. 176-180 ◽  
Author(s):  
T. Perez ◽  
J. Ghanbaja ◽  
S. Mathieu ◽  
L. Latu-Romain ◽  
M. Vilasi ◽  
...  
Keyword(s):  
Oxide Scale ◽  
Microstructural Characterization ◽  
Protective Oxide ◽  
Protective Oxide Scale

Structural Imperfections in thin Oxide Films Formed on Some Fe- and Ni-Base Alloys

1970 ◽  
Vol 28 ◽  
pp. 510-511
Author(s):  
L. P. Lemaire ◽  
D. E. Fornwalt ◽  
F. S. Pettit ◽  
B. H. Kear
Keyword(s):  
Oxide Scale ◽  
Oxidation Process ◽  
Short Circuit ◽  
Protective Oxide ◽  
Protective Oxide Scale ◽  
Thin Oxide Films ◽  
Diffusion Paths ◽  
Oxidation Resistant ◽  
Structural Imperfections ◽  
Short Circuit Diffusion

Oxidation resistant alloys depend on the formation of a continuous layer of protective oxide scale during the oxidation process. The initial stages of oxidation of multi-component alloys can be quite complex, since numerous metal oxides can be formed. For oxidation resistance, the composition is adjusted so that selective oxidation occurs of that element whose oxide affords the most protection. Ideally, the protective oxide scale should be i) structurally perfect, so as to avoid short-circuit diffusion paths, and ii) strongly adherent to the alloy substrate, which minimizes spalling in response to thermal cycling. Small concentrations (∼ 0.1%) of certain reactive elements, such as yttrium, markedly improve the adherence of oxide scales in many alloy systems.

Engine Testing of an Advanced Alloy for Microturbine Primary Surface Recuperators

2005 ◽  
Author(s):  
Wendy J. Matthews ◽  
Terry Bartel ◽  
Dwaine L. Klarstrom ◽  
Larry R. Walker
Keyword(s):  
Steady State ◽  
Oxide Scale ◽  
Engine Test ◽  
Test Results ◽  
Protective Oxide ◽  
Protective Oxide Scale ◽  
Cyclic Operation ◽  
Engine Testing

HAYNES® alloy HR-120® has been identified as a potential alloy for the manufacture of primary surface recuperators. Primary surface recuperator components have been manufactured from HR-120, and actual microturbine testing is on going. Initial engine test results indicate the formation of a protective oxide scale that is resistant to both steady-state and cyclic operation with no evidence of accelerated attack, and which is likely to meet or exceed the desired 80,000 hour component life.

The importance of interfacial chemistry in protective oxide scale adherence

1988 ◽  
Vol 30 (3-4) ◽  
pp. 259-266 ◽  
Author(s):  
J. G. Smeggil ◽  
N. S. Bornstein ◽  
M. A. DeCrescente
Keyword(s):  
Oxide Scale ◽  
Interfacial Chemistry ◽  
Protective Oxide ◽  
Protective Oxide Scale ◽  
Scale Adherence ◽  
Oxide Scale Adherence

The role of (FeCrSi)2(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel

2018 ◽  
Vol 132 ◽  
pp. 214-222 ◽  
Author(s):  
Harri Ali-Löytty ◽  
Markku Hannula ◽  
Timo Juuti ◽  
Yuran Niu ◽  
Alexei A. Zakharov ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxide Scale ◽  
Ferritic Stainless Steel ◽  
Laves Phase ◽  
Protective Oxide ◽  
Protective Oxide Scale

Microstructural Characterization of Oxide Scale Formed by Early Stage of Oxidation of 17%Cr-Mn-Ni Austenitic Stainless Steel

2007 ◽  
Vol 561-565 ◽  
pp. 99-102
Author(s):  
Takayuki Oshima ◽  
Yutaka Yamaguchi ◽  
Kotaro Kuroda
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Oxide Scale ◽  
Spinel Structure ◽  
Early Stage ◽  
Microstructural Characterization ◽  
The Third ◽  
Cold Rolled ◽  
Mn Oxides

The microstructure of oxide scale formed in the early stage of oxidation of cold-rolled sheets of 17%Cr-Mn-Ni austenitic stainless steel was examined using SEM and TEM. Samples were oxidized at 973 to1373K for 1 to 15min. Nodules were observed on the surfaces of specimens oxidized at 1173K. The nodules were composed of two layers, which comprised Fe oxides and Cr-rich Fe-Cr-Mn oxides, respectively. The other scale was composed of two layers of Fe-Cr-Mn oxides with different compositions. Nodules were not observed on the surfaces of the specimens oxidized at 973 and 1373K. After oxidation at 1373K for 1min, the scale was composed of three layers. The first layer consisted of Fe-Mn oxides with a spinel structure, the second consisted mainly of Cr oxides, and the third consisted of Cr-Mn oxides containing a small amount of Fe.

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