18O Tracer studies of Al2O3 scale formation on NiCrAl alloys

K. P. R. Reddy; J. L. Smialek; A. R. Cooper

doi:10.1007/bf00742122

18O Tracer studies of Al2O3 scale formation on NiCrAl alloys

Oxidation of Metals ◽

10.1007/bf00742122 ◽

1982 ◽

Vol 17 (5-6) ◽

pp. 429-449 ◽

Cited By ~ 144

Author(s):

K. P. R. Reddy ◽

J. L. Smialek ◽

A. R. Cooper

Keyword(s):

Scale Formation ◽

Al2o3 Scale ◽

Tracer Studies ◽

Nicral Alloys

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Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

Oxidation of Metals ◽

10.1007/s11085-014-9524-1 ◽

2015 ◽

Vol 83 (3-4) ◽

pp. 335-349 ◽

Cited By ~ 2

Author(s):

H.-E. Zschau ◽

W. Zhao ◽

S. Neve ◽

B. Gleeson ◽

M. Schütze

Keyword(s):

Al Alloys ◽

Scale Formation ◽

Al2o3 Scale

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Protective Al2O3 scale formation on NbAl3-base alloys

Oxidation of Metals ◽

10.1007/bf00938458 ◽

1991 ◽

Vol 36 (1-2) ◽

pp. 113-141 ◽

Cited By ~ 33

Author(s):

J. Doychak ◽

M. G. Hebsur

Keyword(s):

Scale Formation ◽

Al2o3 Scale

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Study of Scale Formation on Al2O3-Scale Forming Alloys by Time-of-Flight Secondary Ion Mass Spectrometry (TOF–SIMS)

Materials Performance and Characterization ◽

10.1520/mpc20160063 ◽

2017 ◽

Vol 6 (3) ◽

pp. 20160063 ◽

Cited By ~ 1

Author(s):

K. Abbasi ◽

M. Azar Zahiri ◽

A. H. Heuer

Keyword(s):

Mass Spectrometry ◽

Secondary Ion Mass Spectrometry ◽

Time Of Flight ◽

Scale Formation ◽

Al2o3 Scale ◽

Tof Sims ◽

Ion Mass Spectrometry ◽

Secondary Ion

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On the Loss of Protective Scale Formation in Creep-Resistant, Alumina-Forming Austenitic Stainless Steels at 900°C in Air

Materials Science Forum ◽

10.4028/www.scientific.net/msf.595-598.725 ◽

2008 ◽

Vol 595-598 ◽

pp. 725-732 ◽

Cited By ~ 15

Author(s):

M.P. Brady ◽

Yukinori Yamamoto ◽

Bruce A. Pint ◽

M.L. Santella ◽

P.J. Maziasz ◽

...

Keyword(s):

Internal Oxidation ◽

Stainless Steels ◽

Austenitic Stainless Steels ◽

Temperature Limit ◽

Scale Formation ◽

Second Phase ◽

Al2o3 Scale ◽

Internal Nitridation ◽

Key Factor ◽

Nb Additions

A family of creep-resistant, Al2O3-forming austenitic (AFA) stainless steels was recently developed. The alloys exhibit excellent oxidation resistance up to ∼800°C, but are susceptible to internal attack of Al at higher temperatures. In the present work, higher levels of Ni, Cr, Al, and Nb additions were found to correlate with improved oxidation behavior at 900°C in air. The alloys generally appeared to be initially capable of external Al2O3 scale formation, with a subsequent transition to internal attack of Al (internal oxidation and internal nitridation) that is dependent on alloy composition. Compositional profiles at the alloy/scale interface suggest that the transition to internal oxidation is preceded by subsurface depletion of Al in the lower-Al compositions. In higher Al-containing compositions, NiAl second-phase precipitates act as an Al reservoir, and Al depletion may not be a key factor. Alloy design directions to increase the upper-temperature limit of protective Al2O3 scale formation in these alloys are discussed.

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