Hot Corrosion Studies on GTA Welded AISI 304, Monel 400 Subjected to Air Oxidation and Molten Salt Environment

2011 ◽  
Vol 383-390 ◽  
pp. 4688-4692
Author(s):  
Ramkumar K. Devendranath ◽  
N. Arivazhagan ◽  
S Narayanan
Keyword(s):  
Molten Salt ◽  
Hot Corrosion ◽  
Gta Welding ◽  
Xrd Analysis ◽  
Air Oxidation ◽  
Aisi 304 ◽  
Nickel Copper ◽  
Steel Aisi ◽  
Monel 400 ◽  
Marine Applications

An attempt was made to study the hot corrosion behavior on gas tungeten arc welded Austenitic stainless steel AISI 304 and Nickel-copper alloy Monel 400. These materials are widely used in power plant, petro-chemical and marine applications where the weldments are usually subjected to aggressive corrosion environment. GTA welding was carried out using ENiCu-7 and E308L filler wires. Various regions of the weldment of AISI 304, Monel 400 were exposed to the air oxidation as well as in the molten salt environment consist of K2SO4 + NaCl (60%) at 700°C. Mechanical properties of the weldments were also studied. The corrosion products of the weldments were analyzed using SEM/EDAX, XRD analysis.

scholarly journals Hot corrosion behavior of monel 400 and AISI 304 dissimilar weldments exposed in the molten salt environment containing Na2SO4 + 60% V2O5 at 600 °C

2014 ◽  
Vol 17 (5) ◽  
pp. 1273-1284 ◽  
Author(s):  
K. Devendranath Ramkumar ◽  
N. Arivazhagan ◽  
S. Narayanan ◽  
Debidutta Mishra
Keyword(s):  
Molten Salt ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Aisi 304 ◽  
Monel 400

Investigations on the Performance of Gta Welded Dissimilar Aisi 304 and Aisi 310s Subjected to Cyclic Hot Corrosion

2012 ◽  
Vol 622-623 ◽  
pp. 304-308
Author(s):  
Amar Parth Sahu ◽  
Rishi Kapoor ◽  
T. Prashanth ◽  
Jeet Kumar Kesharwani ◽  
Ramkumar K. Devendranath ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Molten Salt ◽  
Optical Microscopy ◽  
Hot Corrosion ◽  
Research Work ◽  
Air Oxidation ◽  
Aisi 304 ◽  
Edax Analysis ◽  
Gas Tungsten Arc ◽  
Corrosion Studies

This research work aims at investigating the performance of the gas tungsten arc welded dissimilar AISI 304 and AISI 310S when subjected to cyclic hot corrosion in air oxidation and in the molten salt environment of K2SO4 + 60% NaCl environment at 600°C. The weldments are characterized for its mechanical and metallurgical properties. Tensile strength of the weldment is found to be 529 Mpa. Further the hot corrosion studies are performed on the various zones of the weldment and the corrosion products are characterized by the combined techniques of optical microscopy, XRD and SEM/EDAX analysis.

Investigation of Air oxidation and hot corrosion behavior of Boiler grade material Austenitic stainless steel AISI 347

2020 ◽  
Vol 22 ◽  
pp. 1694-1701
Author(s):  
S.M. Muthu ◽  
M. Venkateshkannan ◽  
Shubham Gupta ◽  
K. Surya Prakash ◽  
M. Arivarasu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Air Oxidation ◽  
Steel Aisi ◽  
Grade Material ◽  
Stainless Steel Aisi

Studies on Thin Film Oxide Formation on GTA Welded AISI 304 & AISI 310S Exposed at 600°C

2012 ◽  
Vol 584 ◽  
pp. 131-135 ◽  
Author(s):  
Jeet Kumar Kesharwani ◽  
Abhilash Paliwal ◽  
Kamir Kothari ◽  
K. Devendranath Ramkumar ◽  
N. Arivazhagan ◽  
...  
Keyword(s):  
Thin Film ◽  
Research Work ◽  
Weld Zone ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
Air Oxidation ◽  
Oxide Formation ◽  
Aisi 304 ◽  
Gas Tungsten Arc ◽  
Marine Applications

In this research work, an attempt was made to study the thin film oxide formation on the dissimilar gas tungsten arc welded austenitic stainless steels of grades AISI 304 and AISI 310S using E309L filler wire. These combinations are widely used in power plant and marine applications. An assessment was carried out to estimate the metallurgical, mechanical properties of the weldment. Tensile tests revealed that the fracture occurred at the weld zone. In addition, Vickers Micro-hardness tests were performed across the length of the weldment. Furthermore, hot corrosion studies were performed on different regions (heat affected zones, weld zone and parent metal zones) of the weldment subjected to air oxidation at 600°C. It was revealed from thermogravimetric analysis that there was weight loss in the heat affected zone of the AISI 310S side after 50 cycles. The thin film oxide layer formation on various zones of the weldment was examined using the combined techniques of optical microscopy, XRD and SEM/EDAX analysis.

scholarly journals Performance of air plasma sprayed Cr3C2-25NiCr and NiCrMoNb coated X8CrNiMoVNb16-13 alloy subjected to high temperature corrosion environment

2022 ◽  
Author(s):  
P Subramani ◽  
M Sathishkumar ◽  
M Manikandan ◽  
S Senthil Kumaran ◽  
V Sreenivasulu ◽  
...  
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Bond Strength ◽  
Molten Salt ◽  
Environmental Conditions ◽  
Xrd Analysis ◽  
Vital Role ◽  
Air Plasma ◽  
Air Oxidation ◽  
Plasma Sprayed

Abstract Thermal barrier coating plays a vital role in protecting materials' surfaces from high-temperature environment conditions. This work compares the demeanour of uncoated and air plasma sprayed Cr3C2-25NiCr and NiCrMoNb coated X8CrNiMoVNb16-13 substrates subjected to air oxidation and molten salt (Na2SO4 + 60%V2O5) environment condition at 900°C for 50 cycles. Coating characteristics have been analyzed through microstructure, thickness, porosity, hardness, and bond strength. SEM, EDS and XRD analysis were used to analyze corrosion's product at the end of the 50th cycle. Coating microstructures showed a uniform laminar structure that is adherent and denser with a coating thickness of 150 ± 20 μm and porosity less than 3.5%. The Microhardness of both the coated substrates were higher than that of the bare substrate. Cr3C2-25NiCr and NiCrMoNb coating bond strength was 38.9 MPa and 42.5 MPa. Thermogravimetric analysis showed the parabolic rate law of oxidation for all the substrates in both environments. In the molten salt environment, all the substrates exhibited higher weight gain compared to the air oxidation environment. In both environmental conditions, the uncoated X8CrNiMoVNb16-13 alloy exhibited higher weight gain than the coated substrates. The formation of Cr2O3, NiO and spinel oxide NiCr2O4 offers good resistance to corrosion to all the substrates in both the environmental condition. However, the presence of Mo and Nb significantly accelerated the corrosion of the substrate, thereby increasing the weight of the NiCrMoNb substrate. It is observed that Cr3C2-25NiCr and NiCrMoNb coating over the X8CrNiMoVNb16-13 substrate significantly protected the substrate against the hot corrosion than the bare alloy exposed to similar environmental conditions.

Hot corrosion behaviour of Super 304H for marine applications at elevated temperatures

2017 ◽  
Vol 64 (5) ◽  
pp. 508-514 ◽  
Author(s):  
M. Adam Khan ◽  
S. Sundarrajan ◽  
S. Natarajan
Keyword(s):  
Hot Corrosion ◽  
Elevated Temperatures ◽  
Corrosion Behaviour ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Salt Mixture ◽  
Content Type ◽  
X Ray ◽  
Different Temperatures ◽  
Marine Applications

Purpose The aim of this paper is to study the hot corrosion behaviour of super 304H stainless steel for marine applications. Design/methodology/approach The investigation was carried out with three different combinations of salt mixture (Na2SO4, NaCl and V2O5) at two different temperatures (800 and 900°C). Findings The spalling and growth of oxide layer was observed more with the presence of V2O5 in the salt mixture at 900°C during experimentation than what was observed in 800°C. The mass change per unit area is calculated to study the corrosion kinetics and also the influence of salt mixture. Further, the samples are analysed through materials characterisation techniques using optical image, scanning electron microscope (SEM), energy dispersive X-ray (EDAX) and X-ray diffraction (XRD) analysis. The presence of V2O5 in the salt mixture was the most important influencing species for accelerating hot corrosion. Originality/value SEM, EDAX and XRD analysis confirmed the formation of Fe2O3 and Cr2O3 at 900°C showing contribution in corrosion protection.

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.

Hot Corrosion Studies on Bimetallic Combinations of Monel 400 and AISI 304 Subjected to Molten Salt Environment

2011 ◽  
Vol 383-390 ◽  
pp. 3217-3222 ◽  
Author(s):  
Ramkumar K. Devendranath ◽  
N. Arivazhagan ◽  
S Narayanan
Keyword(s):  
Molten Salt ◽  
Arc Welding ◽  
Weld Zone ◽  
Analytical Techniques ◽  
Base Metals ◽  
Dissimilar Joints ◽  
Aisi 304 ◽  
Gas Tungsten Arc ◽  
Corrosion Studies ◽  
Monel 400

Dissimilar joints of Monel 400 and AISI 304 are used widely in marine and offshore environments for the fabrication of heat exchangers, evaporators, piping and vessels as well as in the chemical, petrochemical, and power generation industries. An attempt was made to weld Monel 400 and AISI 304 by gas tungsten arc welding using ENiCu-7 and E309L filler wires. A comparative analysis was carried out on these weldments so as to examine the weldability, mechanical and metallurgical properties of the weldment. In addition, corrosion behavior of these weldments has been carried out on the dissimilar weldments in K2SO4+ NaCl (60%) molten salt environment at 600°C under cyclic conditions. The oxide scales formed on the various zones of the weldment have been characterized systematically using surface analytical techniques. Weld zone was found to be more susceptible to degradation than in base metals.

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