Long-term oxidation resistance and deterioration mechanism of magnetron sputtered Cr-Al-Si-N coatings on zirconium alloys in 1200 °C steam atmosphere

2020 ◽  
Vol 171 ◽  
pp. 108603
Author(s):  
Han Zhu ◽  
Haiyong Liu ◽  
Jingyuan Zhou ◽  
Yue Dong ◽  
Peng Li ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Zirconium Alloys ◽  
Deterioration Mechanism

Stainless Steels With Improved Oxidation Resistance for Recuperators

2004 ◽  
Vol 128 (2) ◽  
pp. 370-376 ◽  
Author(s):  
Bruce A. Pint
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Oxidation Resistance ◽  
Stainless Steels ◽  
Lower Cost ◽  
Exhaust Gas ◽  
New Materials ◽  
Excellent Corrosion Resistance ◽  
Gas Environment

New materials are being evaluated to replace type 347 stainless steel in microturbine recuperators operating at higher temperatures in order to increase the efficiency of the microturbine. Commercial alloys 120 and 625 are being tested along with potentially lower cost substitutes, such as Fe-20Cr-25Ni and Fe-20Cr-20Ni. Long-term testing of these materials at 650–700 °C shows excellent corrosion resistance to a simulated exhaust gas environment. Testing at 800 °C has been used to further differentiate the performance of the various materials. The depletion of Cr from foils of these materials is being used to evaluate the rate of attack. Although those alloys with the highest Ni and Cr contents have longer lives in this environment, lower alloyed steels may have sufficient protection at a lower cost.

Study of mechanism of oxidation resistance enhancement induced by preformed oxide on zirconium alloys

2019 ◽  
Vol 158 ◽  
pp. 108105 ◽  
Author(s):  
Cheol Min Lee ◽  
Young-Soo Han ◽  
Yong-Kyoon Mok ◽  
Dong-Seong Sohn
Keyword(s):  
Oxidation Resistance ◽  
Zirconium Alloys ◽  
Mechanism Of Oxidation

Surface and Corrosion Study of Laser-Processed Zirconium Alloys

CORROSION ◽  
1991 ◽  
Vol 47 (10) ◽  
pp. 769-777 ◽  
Author(s):  
J. Rawers ◽  
W. Reitz ◽  
S. Bullard ◽  
E. K. Roub
Keyword(s):  
Zirconium Alloys ◽  
Amorphous Solid ◽  
Heat Treating ◽  
Laser Alloying ◽  
Laser Glazing ◽  
Strong Function ◽  
Fine Grain ◽  
Fecl3 Solution ◽  
Pure Zirconium

Abstract Reactor Grade Zirconium (Zircaloy-2) was laser-glazed and laser-alloyed with nickel (Ni) or chromium (Cr) powders. Laser alloying produced a surface that was macroscopically, chemically homogeneous. However, at the microscopic level the melt zone was a mixture of microcrystalline pure zirconium (Zr) and extremely fine grain, or possibly amorphous, solid solution regions of Zr and alloying elements. Corrosion tests (potentiodynamic and long-term immersion) were conducted in 10% FeCl3 solution. The potentiodynamic tests showed icorr and Ecorr were a strong function of surface conditioning, altered by grit-blasting, laser processing, acid cleaning, and heat treating. Significant improvement was achieved in corrosion resistance by laser-glazing and laser-alloying.

scholarly journals The Effect of Tellurium on Oxidation Resistance of Zirconium Alloys

1959 ◽  
Vol 23 (8) ◽  
pp. 486-489
Author(s):  
Tadao Sano ◽  
Shosuke Imoto ◽  
Mungyu Kang ◽  
Yasuo Hashimoto
Keyword(s):  
Oxidation Resistance ◽  
Zirconium Alloys

Evaluation of Alumina-Forming Austenitic Foil for Advanced Recuperators

2010 ◽  
Author(s):  
Bruce A. Pint ◽  
Michael P. Brady ◽  
Yukinori Yamamoto ◽  
Michael L. Santella ◽  
Philip J. Maziasz ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Oxidation Behavior ◽  
Alumina Scale ◽  
Exhaust Gas ◽  
Commercial Batch ◽  
Oxidation Testing ◽  
Thick Foil

A corrosion- and creep-resistant austenitic stainless steel has been developed for advanced recuperator applications. By optimizing the Al and Cr contents, the alloy is fully austenitic for creep strength while allowing the formation of a chemically-stable external alumina scale at temperatures up to 900°C. An alumina scale eliminates long-term problems with the formation of volatile Cr oxy-hydroxides in the presence of water vapor in exhaust gas. As a first step in producing foil for primary surface recuperators, three commercially cast heats have been rolled to ∼100μm thick foil in the laboratory to evaluate performance in creep and oxidation testing. Results from initial creep testing are presented at 675° and 750°C showing excellent creep strength compared to other candidate foil materials. Laboratory exposures in humid air at 650°-800°C have shown acceptable oxidation resistance. Similar oxidation behavior was observed for sheet specimens of these alloys exposed in a modified 65kW microturbine for 2,871h. One composition that showed superior creep and oxidation resistance has been selected for preparation of a commercial batch of foil.

KUBOTA ALLOY HN

Alloy Digest ◽  
2010 ◽  
Vol 59 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Temperature Performance ◽  
Term Creep ◽  
Rupture Properties ◽  
Better Than

Abstract Kubota alloy HN is an austenitic Fe-Ni-Cr alloy with long-term creep-rupture properties that are intermediate between those of HK40 and HP40 alloys. Carburization resistance is better than that of HK40, but oxidation resistance is generally lower, making the alloy suitable for long service at 1095 deg C (2000 deg F). This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, machining, and joining. Filing Code: SS-1060. Producer or source: Kubota Metal Corporation, Fahramet Division.

Microstructural evolution and oxidation resistance of T92 boiler tube steel upon long-term supercritical steam test

2017 ◽  
Vol 125 ◽  
pp. 361-366 ◽  
Author(s):  
Kejian Li ◽  
Houyu Ma ◽  
Yinsheng He ◽  
Jungchel Chang ◽  
Si-yeon Bae ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Microstructural Evolution ◽  
Tube Steel ◽  
Boiler Tube ◽  
Boiler Tube Steel

Long-Term Oxidation Resistance of Several Precipitation Strengthened Ni-Based Superalloys

2017 ◽  
Author(s):  
Joseph Meyer ◽  
Vinay Deodeshmukh
Keyword(s):  
Thermal Stability ◽  
Mechanical Strength ◽  
Gas Turbine ◽  
Oxidation Resistance ◽  
Weight Change ◽  
Creep Resistance ◽  
Gamma Prime ◽  
Change Behavior ◽  
Better Than

Precipitation strengthened alloys are a staple material in the gas-turbine industry due to their excellent creep and mechanical strength. HAYNES® 282® alloy was developed to have excellent creep resistance while maintaining good fabricability and thermal stability. However, its long-term oxidation resistance has not been fully established. The purpose of this paper is to present yearlong oxidation data of 282 alloy at 871°C (1600°F) and to rank it with well-known gamma prime strengthened alloys: 263 alloy, R-41 alloy, and Waspaloy alloy. The oxidation resistance of each alloy was ranked based on weight change behavior, metal recession, Cr depletion, and microstructure. It was found that at 871°C, 282 alloy had oxidation resistance similar to 263 alloy but better than Waspaloy alloy.

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