The Oxidation of Metal Alloy Foils in the Presence of Water Vapor

2003 ◽  
Author(s):  
James M. Rakowski
Keyword(s):  
Water Vapor ◽  
Elevated Temperature ◽  
Chromium Oxide ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Test Results ◽  
Temperature Oxidation ◽  
Chromium Oxide Layer ◽  
Nickel Base

Water vapor can be detrimental to the elevated temperature oxidation resistance of alloys that rely on the formation of a protective chromium oxide layer. The resulting degradation can be significant, particularly when such alloys are in the form of light gauge sheet and strip. Long term test results will be presented for commercially available wrought austenitic stainless steels and for the nickel-base superalloys 625 and HX exposed at 1300°F and 1400°F in environments containing various levels of water vapor.

The Oxidation of Metal Alloy Foils in the Presence of Water Vapor

2004 ◽  
Vol 126 (4) ◽  
pp. 867-873 ◽  
Author(s):  
James M. Rakowski
Keyword(s):  
Water Vapor ◽  
Elevated Temperature ◽  
Chromium Oxide ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Test Results ◽  
Temperature Oxidation ◽  
Chromium Oxide Layer ◽  
Nickel Base

Water vapor can be detrimental to the elevated temperature oxidation resistance of alloys that rely on the formation of a protective chromium oxide layer. The resulting degradation can be significant, particularly when such alloys are in the form of light gauge sheet and strip. Long-term test results will be presented for commercially available wrought austenitic stainless steels and nickel-base superalloys exposed at 1300°F and 1400°F in environments containing various levels of water vapor.

Contributions of Dr. Sumio Yukawa in the Development of Non-Ductile Failure Prevention Rules in the ASME Code

2008 ◽  
Author(s):  
Hardayal S. Mehta
Keyword(s):  
Elevated Temperature ◽  
Carbon Steel ◽  
Stainless Steels ◽  
Pressure Vessel ◽  
Nickel Alloys ◽  
Ductile Failure ◽  
Austenitic Stainless Steels ◽  
Current Status ◽  
Asme Code

The objective of this paper is to review and highlight the contributions of Dr. Sumio Yukawa in the development of rules for the prevention of non-ductile failure in the ASME Boiler and Pressure Vessel Code. This includes review of his role in the development of WRC-175, Appendix G of Section III, the development of early flaw evaluation rules for carbon steel piping and in the review and evaluation of the toughness of austenitic stainless steels and nickel alloys after long-term elevated temperature exposures. The current status of these activities is briefly described.

Increasing the Upper Temperature Oxidation Limit of Alumina Forming Austenitic Stainless Steels in Air with Water Vapor

2011 ◽  
Vol 75 (5-6) ◽  
pp. 337-357 ◽  
Author(s):  
M. P. Brady ◽  
K. A. Unocic ◽  
M. J. Lance ◽  
M. L. Santella ◽  
Y. Yamamoto ◽  
...  
Keyword(s):  
Water Vapor ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Temperature Oxidation

The Effect of Water Vapor on Cr Depletion in Advanced Recuperator Alloys

2005 ◽  
Author(s):  
Bruce A. Pint
Keyword(s):  
Water Vapor ◽  
Stainless Steels ◽  
Laboratory Testing ◽  
Low Cost ◽  
Austenitic Stainless Steels ◽  
Nodule Formation ◽  
Exhaust Gas ◽  
Operating Lifetime ◽  
Cr Depletion

Durable alloy foils are needed for gas turbine recuperators operating at 650°–700°C. It has been established that water vapor in the exhaust gas causes more rapid consumption of Cr in austenitic stainless steels leading to a reduction in operating lifetime of these thin-walled components. Laboratory testing at 650°–800°C of commercial and model alloys is being used to develop a better understanding of the long-term rate of Cr consumption in these environments. Results are presented for commercial alloys 709, 120 and 625. After 10,000h exposures at 650° and 700°C in humid air, grain boundary Cr depletion was observed near the surface of all these materials. In the Fe-base alloys, 709 and 120, this depletion led to localized Fe-rich nodule formation. This information then can be used to develop low-cost alternatives to currently available candidate materials.

Corrosion Performance of Austenitic Alloys in Automobile Exhaust Environments

1977 ◽  
Vol 99 (3) ◽  
pp. 234-238 ◽  
Author(s):  
J. E. Chart ◽  
H. T. Michels
Keyword(s):  
Water Vapor ◽  
Stainless Steels ◽  
Gasoline Engine ◽  
General Trend ◽  
Nickel Content ◽  
Superior Performance ◽  
Corrosion Performance ◽  
Engine Exhaust ◽  
Austenitic Alloys ◽  
Nickel Base

The performance of several austenitic alloys ranging from low alloy content stainless steels to nickel-base alloys has been evaluated at temperatures from 704–1093°C (1300–2000°F) in cyclic air + 10 percent water vapor and from 704–982°C (1300–1800°F) in gasoline engine exhaust. The gasoline engine exhaust was found to be the more aggresive of the two test environments. A general trend of increasing performance with increasing nickel content was observed. At the highest test temperatures in both tests, the nickel-base alloys clearly displayed superior performance.

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