An investigation of oxidation/hot corrosion-creep interaction at 800 °C in a Ni-base superalloy coated with salt mixture deposits of Na2SO4-NaCl-NaVO3

2019 ◽  
Vol 147 ◽  
pp. 283-298
Author(s):  
Venkateswararao Mannava ◽  
A. Sambasivarao ◽  
Neeta Paulose ◽  
M. Kamaraj ◽  
Ravi Sankar Kottada
Keyword(s):  
Hot Corrosion ◽  
Salt Mixture ◽  
Corrosion Creep ◽  
Base Superalloy

Hot corrosion studies on Ni-base superalloy at 650°C under marine-like environment conditions using three salt mixture (Na2SO4+NaCl+NaVO3)

2016 ◽  
Vol 105 ◽  
pp. 109-119 ◽  
Author(s):  
Venkateswararao Mannava ◽  
A. Sambasiva Rao ◽  
Neeta Paulose ◽  
M. Kamaraj ◽  
Ravi Sankar Kottada
Keyword(s):  
Hot Corrosion ◽  
Salt Mixture ◽  
Corrosion Studies ◽  
Base Superalloy

Preparation and hot corrosion behaviour of an Al-gradient NiCoCrAlYSiB coating on a Ni-base superalloy

2009 ◽  
Vol 51 (4) ◽  
pp. 860-867 ◽  
Author(s):  
Z.B. Bao ◽  
Q.M. Wang ◽  
W.Z. Li ◽  
X. Liu ◽  
J. Gong ◽  
...  
Keyword(s):  
Hot Corrosion ◽  
Corrosion Behaviour ◽  
Base Superalloy

Hot corrosion of glass coating on nickel base superalloy

2008 ◽  
Vol 34 (5) ◽  
pp. 1215-1222 ◽  
Author(s):  
S. Das ◽  
S. Datta ◽  
D. Basu ◽  
G.C. Das
Keyword(s):  
Hot Corrosion ◽  
Nickel Base Superalloy ◽  
Glass Coating ◽  
Nickel Base ◽  
Base Superalloy

Effect of Salt-Coating Hot Corrosion on Stress-Rupture Properties of a Corrosion Resistant Directionally Solidified Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 502-506 ◽  
Author(s):  
Xue Da Chen ◽  
Qing Li ◽  
Cheng Bo Xiao ◽  
Wei Peng Ren
Keyword(s):  
High Temperature ◽  
Hot Corrosion ◽  
Stress Rupture ◽  
Directionally Solidified ◽  
Salt Mixture ◽  
Mixture Ratio ◽  
Corrosion Resistant ◽  
Stress Rupture Properties ◽  
Salt Mixtures ◽  
Rupture Properties

The hot components of gas turbine are loaded by high stresses in presence of high-temperature oxidation and hot corrosion environment during service process. It is important to simulate the interaction of stress and hot corrosion on the components in real service situation. Effect of the ratios of salt mixtures of Na2SO4/NaCl and the coating amounts of salt mixtures on the microstructure and the high temperature stress-rupture properties of a corrosion resistant directionally solidified superalloy at 850/500MPa were investigated. The results demonstrated that the stress-rupture life decreased with the coated salt mixture ratio of Na2SO4/NaCl changing from 3:1 to 9:1. Stress-rupture lives of the alloy decreased from 63 h to 42 h, while the coated salt mixtures amount increased from 1 mg/cm2 to 4 mg/cm2, hereby the salt mixture contained 75% Na2SO4 and 25% NaCl. When the coating ratio of Na2SO4/NaCl was 9:1, the stratified corrosion products layers were composed of the (Ni, Co)O, Ni (Al, Cr)2O4 layer, bright grey phase that be identified as CrWO4, and the underlying dispersed particle shape phase CrSx, the underlying layer forms the sulfides eutectic and leads to catastrophic destruction for the alloy, which decreased the stress-rupture lives dramatically.

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