Investigations on hot corrosion resistance of bare and nickel chromium coated superni 76 super alloy

2021 ◽  
Author(s):  
Ripandeep Singh ◽  
Gurpreet Singh ◽  
Hazoor Singh Sidhu
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Nickel Chromium ◽  
Super Alloy

Effect of Aluminising on the Hot Corrosion Resistance of Nickel-Chromium Alloys

2006 ◽  
Vol 514-516 ◽  
pp. 505-509 ◽  
Author(s):  
César A.C. Sequeira ◽  
Fernand D.S. Marquis
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Hot Corrosion ◽  
Xrd Analysis ◽  
Weight Percent ◽  
Test Results ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Nial Phase ◽  
Cyclic Corrosion

The effects of aluminising on the hot corrosion resistance of two nickel-chromium alloys containing 10 and 30 weight percent chromium, respectively, were examined. The Ni/Cr specimens were aluminised by pack cementation in Ar and underwent cyclic hot corrosion testing in Na2SO4- NaCl molten salt. XRD analysis indicated that a NiAl phase formed between the coating layer and substrate. Cyclic hot corrosion test results indicated that the effects of aluminising are more pronounced in the case of the 10 % Cr than in the case of 30 % Cr. The ductile NiAl phase suppressed the potential for crack initiation during thermal cycling of the 10 % Cr specimens, and reinforced the hot cyclic corrosion resistance in molten salt for the 30 % Cr specimens.

scholarly journals Hot Corrosion Resistance of Nickel‐Chromium‐Aluminum Alloys

1978 ◽  
Vol 125 (2) ◽  
pp. 271-278 ◽  
Author(s):  
Gilbert J. Santoro ◽  
Charles A. Barrett
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Hot Corrosion ◽  
Nickel Chromium

scholarly journals Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 347 ◽  
Author(s):  
Lidia Baiamonte ◽  
Cecilia Bartuli ◽  
Francesco Marra ◽  
Annamaria Gisario ◽  
Giovanni Pulci
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Gas Turbines ◽  
Surface Hardness ◽  
Cermet Coatings ◽  
Nickel Chromium ◽  
Sprayed Coatings ◽  
Power Diode ◽  
High Power Diode Laser ◽  
Type Ii Hot Corrosion

Hot corrosion affects the components of diesel engines and gas turbines working at high temperatures, in the presence of low-melting salts and oxides, such as sodium sulfate and vanadium oxide. Thermal-sprayed coatings of nickel–chromium-based alloys reinforced with ceramic phases, can improve the hot corrosion and erosion resistance of exposed metals, and a sealing thermal, post-treatment can prove effective in reducing the permeability of aggressive species. In this study, the effect of purposely-optimized high-power diode laser reprocessing on the microstructure and type II hot corrosion resistance of cermet coatings of various compositions was investigated. Three different coatings were produced by high velocity oxy-fuel and was tested in the presence of a mixture of Na2SO4 and V2O5 at 700 °C, for up to 200 h: (i) Cr3C2–25% NiCr, (ii) Cr3C2–25% CoNiCrAlY, and (iii) mullite nano–silica–60% NiCr. Results evidenced that laser sealing was not effective in modifying the mechanism, on the basis of the hot corrosion degradation but could provide a substantial increase of the surface hardness and a significant decrease of the overall coating material consumption rate (coating recession), induced by the high temperature corrosive attack.

Effects of Nano-Al2O3p on Hot Corrosion Resistance of NiCoCrAlY Cladded Coatings

2013 ◽  
Vol 670 ◽  
pp. 65-69 ◽  
Author(s):  
H.Y. Wang ◽  
Dun Wen Zuo ◽  
X.F. Li ◽  
M.D. Wang ◽  
Y.P. Yu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Laser Cladding ◽  
Hot Corrosion ◽  
Influencing Mechanism ◽  
The One ◽  
Super Alloy ◽  
Better Than

Three NiCoCrAlY cladded coatings reinforced by different contents of nano- Al2O3p and one without nano-Al2O3p were prepared on a Ni-base super alloy using laser cladding technique. Hot corrosion of the NiCoCrAlY coatings in Na2SO4/K2SO4 (75:25, wt. /wt.) mixture was performed at 1050 °C in static air. The effects and influencing mechanism of nano-Al2O3p on the hot corrosion behavior of the coatings were discussed. Results indicate that the hot corrosion resistance of the coatings with nano-Al2O3p is better than that of the one without nano-Al2O3p, among which the one with 1.0 wt. % nano-Al2O3p presented the best hot corrosion resistance. The improvement of the hot corrosion resistance is largely due to the refinement of the microstructure after adding nano-Al2O3p.

PYROMET 901

Alloy Digest ◽  
1975 ◽  
Vol 24 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Gas Turbines ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Nickel Chromium ◽  
Technology Corporation ◽  
Carpenter Technology Corporation ◽  
Super Alloy

Abstract PYROMET 901 is a nickel-chromium super alloy designed for high strength and corrosion resistance in the temperature range of 1000-1400 F. Compounds of Ni3 (Al, Ti) type produce the precipitation hardening. It is used in a variety of high-temperature applications such as components in aircraft and gas turbines. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-216. Producer or source: Carpenter Technology Corporation.

HOT CORROSION RESISTANCE AND MECHANICAL BEHAVIOR OF ATMOSPHERIC PLASMA SPRAYED CONVENTIONAL AND NANOSTRUCTURED ZIRCONIA COATINGS

2012 ◽  
Vol 05 ◽  
pp. 720-727 ◽  
Author(s):  
MOHSEN SAREMI ◽  
AHMAD KEYVANI ◽  
MAHMOUD HEYDARZADEH SOHI
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Atmospheric Plasma ◽  
Indentation Method ◽  
Nano Indentation ◽  
Spray Technique ◽  
Ysz Coating ◽  
Packed Structure ◽  
Plasma Sprayed ◽  
Super Alloy

Conventional and nanostructured zirconia coatings were deposited on In-738 Ni super alloy by atmospheric plasma spray technique. The hot corrosion resistance of the coatings was measured at 1050°C using an atmospheric electrical furnace and a fused mixture of vanadium pent oxide and sodium sulfate respectively. According to the experimental results nanostructured coatings showed a better hot corrosion resistance than conventional ones. The improved hot corrosion resistance could be explained by the change of structure to a dense and more packed structure in the nanocoating. The evaluation of mechanical properties by nano indentation method showed the hardness (H) and elastic modulus (E) of the YSZ coating increased substantially after hot corrosion.

UNS N06455

Alloy Digest ◽  
1989 ◽  
Vol 38 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Stress Corrosion Cracking ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Ductility ◽  
High Temperature Stability ◽  
Nickel Chromium ◽  
Long Time ◽  
Resistance To Stress

Abstract UNS NO6455 is a nickel-chromium-molybdenum alloy with outstanding high-temperature stability as shown by high ductility and corrosion resistance even after long-time aging in the range 1200-1900 F. The alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-367. Producer or source: Nickel and nickel alloy producers.

INCO ALLOY G-3

Alloy Digest ◽  
1986 ◽  
Vol 35 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Affected Zone ◽  
Iron Alloy ◽  
Heat Treating ◽  
Minor Elements ◽  
Nickel Chromium ◽  
Inco Alloy

Abstract INCO Alloy G-3 is a nickel-chromium-iron alloy with additions of molybdenum and copper. Some of the minor elements are controlled to provide increased resistance to weld heat-affected zone corrosion. The alloy has exceptional stress-corrosion cracking resistance in chloride-containing environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-341. Producer or source: lnco Alloys International.

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