Corrosion behaviour of a thin section martensitic stainless steel GTA weldment in chloride solutions

Kumar, M. Senthil; Srinivasan, P. Bala

doi:10.1016/j.matlet.2008.01.072

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…[10][11][12] Researches on corrosion behaviour of 17-4PH stainless steel and influence of welding operation and PWHT is scarcely available. 12,13 In the only available paper studying corrosion behaviour of welded 17-4PH stainless steel and effect of PWHT, Nowacki stated that shielded metal arc welding (SMAW) and flux core arc welding (FCAW) provide very good corrosion resistance in 50% HNO 3 solution. 12 Mass loss measurements showed that aging temperature at higher than 620uC ensures better corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…The microstructural changes due to welding may also cause electrochemical dissimilarity of individual parts in weldment, which in turn induces galvanic corrosion among base–HAZ, base–weld and HAZ–weld couples exposed to corrosive environments 10–12. Researches on corrosion behaviour of 17-4PH stainless steel and influence of welding operation and PWHT is scarcely available 12,13. In the only available paper studying corrosion behaviour of welded 17-4PH stainless steel and effect of PWHT, Nowacki stated that shielded metal arc welding (SMAW) and flux core arc welding (FCAW) provide very good corrosion resistance in 50% HNO 3 solution 12.…”

Section: Introductionmentioning

confidence: 99%

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Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Shoushtari

Moayed

Davoodi

2011

Corrosion Engineering, Science and Technology

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The influence of post-weld heat treatment (PWHT), solution annealing followed by aging at 480, 550 and 620uC on the galvanic corrosion in 17-4PH stainless steel weldment in 3?5%NaCl was studied. Potentiodynamic polarisation revealed that all PWHTs improve the passivity of weld region by increasing the pitting potential. Heat affected zone disappears, and base and weld regions act as the anode and the cathode respectively. Zero resistance ammetry measurement for 42 h showed that PWHTs improve the galvanic corrosion resistance by decreasing the galvanic current density to a few to tenths of nanoampere per square centimetre. Aging at 620uC has the highest risk of galvanic corrosion among the three PWHTs. Difference in corrosion characteristic of base and weld were addressed to microstructure variations including ferrite, copper rich precipitates and reverted austenite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Shoushtari

Moayed

Davoodi

2011

Corrosion Engineering, Science and Technology

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“…Recently, Kumar and Srinivasan13 reported the influence of GTAW on the microstructure, hardness and corrosion behaviour of 410 martensitic stainless steel in various concentrations of sodium chloride electrolyte. Similarity in general corrosion resistance and passivation behaviour of the base metal, weld metal and HAZ regions were obtained in chloride test electrolytes; however, in terms of pitting corrosion resistance, the martensitic structured weld and HAZ region showed much lower pitting resistance compared to the base region.…”

Section: Introductionmentioning

confidence: 99%

“…Similarity in general corrosion resistance and passivation behaviour of the base metal, weld metal and HAZ regions were obtained in chloride test electrolytes; however, in terms of pitting corrosion resistance, the martensitic structured weld and HAZ region showed much lower pitting resistance compared to the base region. They concluded that the microstructural variations due to welding did not influence significantly the general corrosion and passivation behaviour but have a marginal adverse influence on the pitting corrosion resistance 13…”

Section: Introductionmentioning

confidence: 99%

Galvanic corrosion of gas tungsten arc repair welds in 17-4PH stainless steel in 3·5% NaCl solution

Shoushtari

Moayed

Davoodi

2011

Corrosion Engineering, Science and Technology

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In this paper, the galvanic corrosion of individual components of a 17-4PH repair welded stainless steel in 3?5% NaCl solution was investigated using various dc electrochemical measurements and microscopy. Open circuit potential measurement of the regions in the vicinity of a repair weld [i.e. parent metal, weld metal and heat affected zone (HAZ)] in 17-4PH stainless steel in 3?5% NaCl solution indicated that the most likely galvanic couple was between HAZ and weld with the HAZ acting as the anode and weld metal as the cathode. Slow scan rate potentiodynamic polarisation measurement of pitting potentials revealed a lower passive current density and a higher pitting potential in the weld region, while the HAZ showed the highest passive current density and the lowest pitting potential. Observation of the material after applying an anodic potential close to the pitting potential of the individual weld parts also confirmed the formation of several stable pits in the HAZ but only a few metastable pits in the weld and parent metal zones. Galvanic coupling using a zero resistance ammeter also showed a higher current density in the weld metal/HAZ as compared with the parent metal/HAZ and parent metal/weld galvanic couples. Although, the current densities in all measurements were in the range of a few to tenths of nanoampere per square centimetre, it can still be concluded that the weld metal/HAZ couple has the highest risk of galvanic corrosion among the three individual galvanic couples.

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“…The improvement of materials for turbine blades is considered as one of the major contributions of metallurgical research to the progress made in the power industries. [1][2][3] AISI410 martensitic stainless steel (410 SS) is one of the most popular alloys used in the power plants industries and valve seats in chemical processing plants, etc. [2][3][4][5] It is well known that during operation, because of dynamic contact as well as vibration, heat and corrosive environment, the contact surfaces of turbine blades undergo a combination of intensive corrosion, erosion, wear, fatigue and stress corrosion cracking.…”

Section: Introductionmentioning

confidence: 99%

Stellite 21 coatings on AISI 410 martensitic stainless steel by gas tungsten arc welding

Laridjani

Amadeh

Kashani

2010

Materials Science and Technology

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Degradation of AISI 410 martensitic stainless steel, a typical alloy for many applications such as steam turbine blade, could impair its efficiency and lifetime. To overcome this problem, critical surfaces could be modified by weld cladding via gas tungsten arc welding technique. In the present research, a comparative study of Stellite 21 weld overlays deposited in three different thicknesses, i.e. dilutions, at various preheat and post-weld heat treatment temperatures on the surface of AISI 410 martensitic stainless steel, has been made. The surface of coatings has been examined to reveal their microstructures, phase characterisation and mechanical properties using XRD, microhardness tester and metallographic techniques. The results showed that the deposition of Stellite 21 coating on AISI 410 martensitic stainless steel improved its corrosion resistance. Moreover, the volumetric dilution had a considerable effect on the hardness, microstructure and electrochemical corrosion behaviour of Stellite 21 weld overlays.

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Corrosion behaviour of a thin section martensitic stainless steel GTA weldment in chloride solutions

Cited by 10 publications

References 7 publications

Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Post-weld heat treatment influence on galvanic corrosion of GTAW of 17-4PH stainless steel in 3·5%NaCl

Galvanic corrosion of gas tungsten arc repair welds in 17-4PH stainless steel in 3·5% NaCl solution

Stellite 21 coatings on AISI 410 martensitic stainless steel by gas tungsten arc welding

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