Interaction of Ta and Cr on Type-I hot corrosion resistance of single crystal Ni-base superalloys

2017 ◽  
Vol 117 ◽  
pp. 35-42 ◽  
Author(s):  
J.X. Chang ◽  
D. Wang ◽  
G. Zhang ◽  
L.H. Lou ◽  
J. Zhang
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion ◽  
Type I

Effect of Re and Ta on Hot Corrosion Resistance of Nickel-base Single Crystal Superalloys

2016 ◽  
pp. 177-185 ◽  
Author(s):  
J.X. Chang ◽  
D. Wang ◽  
G. Zhang ◽  
L.H. Lou ◽  
J. Zhang
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion ◽  
Nickel Base

scholarly journals Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5774
Author(s):  
Zehao Chen ◽  
Shusuo Li ◽  
Mengmeng Wu ◽  
Yanling Pei ◽  
Shengkai Gong ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion ◽  
Corrosion Properties ◽  
Al2o3 Layer ◽  
Nickel Based Superalloy ◽  
Surface Oxides ◽  
The Relationship ◽  
Positive Effect

A study is carried out on the effect of different surface native pre-oxides on hot corrosion of single crystal nickel-based superalloy at 900 °C. The effect of different oxides formed by different superalloys through pre-oxidation on hot corrosion is verified by normal hot corrosion and tube sealing experiments. The relationship between different surface oxides and the effect of different surface oxides layer on the hot corrosion properties of alloys are studied. In summary, the stable and dense surface pre-Al2O3 layer which can be obtained by pre-oxidation has an obvious positive effect on the improvement of superalloy hot corrosion resistance in reaction. In addition, the internal sulfides are analyzed in depth, and the relationship between Cr, Mo, O and S is discussed in detail.

Mechanism of adding rhenium to improve hot corrosion resistance of nickel-based single-crystal superalloys

Rare Metals ◽  
2020 ◽  
Author(s):  
Fang-Min Yang ◽  
Li-Xian Lian ◽  
Ying Liu ◽  
Xiu-Fang Gong
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion

Effect of Rhenium Addition on Hot Corrosion Resistance of Ni-Based Single Crystal Superalloys

2018 ◽  
Vol 49 (9) ◽  
pp. 4343-4352 ◽  
Author(s):  
J. X. Chang ◽  
D. Wang ◽  
X. G. Liu ◽  
L. H. Lou ◽  
J. Zhang
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion ◽  
Rhenium Addition

Hot corrosion resistance of coated single crystal superalloys under marine conditions

1993 ◽  
Vol 9 (3) ◽  
pp. 253-258 ◽  
Author(s):  
H.-J. Rätzer-Scheibe ◽  
M. R. Winstone
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion

scholarly journals Influence of alloying elements on hot corrosion resistance of nickel-based single crystal superalloys coated with Na2SO4 salt at 900 °C

2021 ◽  
Vol 197 ◽  
pp. 109197
Author(s):  
Peng Song ◽  
Mingfeng Liu ◽  
Xiangwei Jiang ◽  
Yuchao Feng ◽  
Junjie Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Hot Corrosion ◽  
Alloying Elements

Modelling the Development of Type I Hot Corrosion on Coated and Uncoated Single Crystal Superalloys

2008 ◽  
Vol 595-598 ◽  
pp. 689-698
Author(s):  
N.J. Simms ◽  
A. Encinas-Oropesa ◽  
John R. Nicholls
Keyword(s):  
Single Crystal ◽  
Hot Corrosion ◽  
Gas Turbines ◽  
Laboratory Tests ◽  
Turbine Blades ◽  
Combined Cycle ◽  
Deposition Flux ◽  
Type I ◽  
Dimensional Metrology ◽  
Exposure Conditions

Gas turbines are critical components in the combined cycle power systems being developed to generate electricity from solid fuels, such as coal and biomass. The use of such fuels to produce fuel gases introduces the potential for significant corrosive and erosive damage to gas turbine blades and vanes. Single crystal superalloys have been developed for use with clean fuels but are now being deployed in industrial gas turbines. The performance of these materials, with coatings, has to be determined before they can be used with confidence in dirtier fuel environments. This paper reports results from a series of laboratory tests carried out using the ‘deposit replenishment’ technique to investigate the sensitivity of candidate materials to exposure conditions anticipated to cause type I hot corrosion in such gas turbines. The materials investigated have included the single crystal nickel-based superalloys CMSX-4 and SC2-B, both bare and with Pt-Al coatings. The exposure conditions within the laboratory tests have covered ranges of SOx (50 and 500 volume parts per million, vpm) and HCl (0 and 500 vpm) in air, as well as 4/1 (Na/K)2SO4 deposits, with deposition fluxes of 1.5, 5 and 15 5g/cm2/h, for periods of up to 500 hours at 900°C. Data on the performance of materials has been obtained using dimensional metrology: pre-exposure contact measurements and post-exposure measurements of features on polished cross-sections. These measurement methods allow distributions of damage data to be determined for use in the development of materials performance modelling. In addition, the types of damage observed have been characterised using standard optical and SEM/EDX techniques. The damage rates of the single crystal materials without coatings are too high for them to be used with confidence in gas turbines fired with gases derived from ‘dirty fuels’. Under the more severe combinations of gas composition, deposition flux and metal temperature, the corrosion rates of these materials with Pt-Al coatings are also excessive. The data produced from these tests has allowed the sensitivity of hot corrosion damage to changes in the exposure environment to be determined for the single crystal alloys and coating systems examined.

scholarly journals Burner Rig Hot Corrosion of a Single Crystal Ni-48Al-Ti-Hf-Ga Alloy

1998 ◽  
Vol 552 ◽  
Author(s):  
J. A. Nesbitt ◽  
R. Darolia ◽  
M. D. Cuy
Keyword(s):  
Corrosion Resistance ◽  
Single Crystal ◽  
Combustion Chamber ◽  
Corrosion Product ◽  
Hot Corrosion ◽  
Intermediate Stage ◽  
Sea Salt ◽  
Corrosion Attack ◽  
Mound Morphology ◽  
Aluminum Consumption

ABSTRACTThe hot corrosion resistance of a single crystal Ni-48Al-1Ti-0.5Hf-0.2Ga‡ alloy was examined in a Mach 0.3 burner rig at 900C for 300 hours. The combustion chamber was doped with 2 ppmw synthetic sea salt. The hot corrosion attack produced a random mound morphology on the surface. Microstructurally, the hot corrosion attack appeared to initiate with oxide-filled pits which were often broad and shallow. At an intermediate stage, the pits increased in size to incorporate unoxidized Ni islands in the corrosion product. The rampant attack stage, which was observed only at sharp sample corners, was characterized by rapid inward growth of alumina in finger-like protrusions incorporating significant amounts of Al-depleted Ni islands. Aluminum consumption in the oxide fingers resulted in the growth of a γ' layer ahead of the advancing oxide fingers.

CMSX-11B

Alloy Digest ◽  
1998 ◽  
Vol 47 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Single Crystal ◽  
Oxidation Resistance ◽  
Creep Strength ◽  
Hot Corrosion ◽  
First Generation ◽  
Heat Treating ◽  
Corrosion And Oxidation ◽  
Better Than

Abstract CMSX-11B is a non-rhenium containing single-crystal (SX) superalloy defined primarily for industrial turbine applications. The material develops a unique and extremely good blend of hot corrosion and oxidation resistance. It exhibits extremely good castability, employs relatively simple solution heat treatments, and provides creep strength that is as good or better than other first generation SX materials such as CMSX-2 (Alloy Digest Ni-417, November 1992), CMSX-3 (Alloy Digest Ni-420, January 1993), CMSX-4 (Alloy Digest Ni-447, March 1994), CMSX-6 (Alloy Digest Ni-418, December 1992), PWA 1480, and Rene N4. This datasheet provides information on composition and physical properties as well as creep. It also includes information on corrosion resistance as well as casting and heat treating. Filing Code: Ni-537. Producer or source: Cannon-Muskegon Corporation.

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