Effect of metallurgical evolution during post-weld aging treatment on localised corrosion of resistance spot welding joints of A286 superalloy

Tiedra, Pilar De; Martín, Óscar; Blanco, Manuel San Juan

doi:10.1080/1478422x.2018.1473318

Cited by 6 publications

(3 citation statements)

References 50 publications

(86 reference statements)

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“…Electrochemical potentiokinetic reactivation (EPR) is a quasi non-destructive test that is used mainly to assess the DOS, and which is more sensitive, faster and more precise than the conventional corrosion tests [27,28].…”

Section: Introductionmentioning

confidence: 99%

Effect of post-welding sensitisation on the degree of sensitisation of the welding zones of AISI 304 resistance spot welding joints studied by using an electrochemical minicell

Tiedra

Martín

2023

Corrosion Engineering, Science and Technology

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In resistance spot welding (RSW) joints of austenitic stainless steel (ASS), a small-scale electrochemical cell (minicell) was used for assessing individually, on each of the three welding zones, of size less than 1000 µm (fusion zone (FZ), heat affected zone (HAZ) and base metal (BM)), the combined effect of a RSW process and post-welding sensitisation on the degree of sensitisation (DOS). The results show that the three welding zones have different microstructures that make each of them respond differently to post-welding sensitisation. The DOS varies with post-welding sensitisation time in all three welding zones, but it varies at a different rate in each welding zone (the highest rate in the FZ). This variation is due to the fact that when the DOS reaches a certain level, which is observed when plotting the reactivation charge (Q r ) versus the post-welding sensitisation time, a microstructural regeneration occurs.

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Section: Introductionmentioning

confidence: 99%

Effect of post-welding sensitisation on the degree of sensitisation of the welding zones of AISI 304 resistance spot welding joints studied by using an electrochemical minicell

Tiedra

Martín

2023

Corrosion Engineering, Science and Technology

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“…Atashparvar and Hamedi [17] studied the effect of process variables on the small scale resistance spot welding of thin Hastelloy X sheets. Martin et al [18, 19] studied the impact of aging treatment on the hardness/mechanical properties, and corrosion resistance of resistance spot welds made on A286 iron-based precipitation hardened superalloy. Most of the works are focused on the joint properties, and there is a lack of in-depth study regarding the metallurgical response of nickel-based superalloys during resistance spot welding.…”

Section: Introductionmentioning

confidence: 99%

Resistance spot welding of Nimonic 263 nickel-based superalloy: microstructure and mechanical properties

Bemani

Pouranvari

2019

Science and Technology of Welding and Joining

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This paper addresses the metallurgical and mechanical response of Nimonic 263 nickel-based superalloy to resistance spot welding. Solidification structure of the fusion zone is described in terms of dendrite arm spacing, segregation behaviour and secondary carbide formation in the inter-dendritic area. The heat affected zone is featured by negligible grain growth and constitutional liquation of primary (Ti, Mo)C carbide present in the initial microstructure of the base metal. Mechanical behaviour of the welds was characterised by interfacial to pullout failure mode transition, peak load and energy absorption of the joints during the tensile-shear loading. The fusion zone size and the electrode indentation depth are the key factors controlling peak load and energy absorption of the Nimonic 263 resistance spot welds.

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“…4. The aging treatment does not eliminate the heat affected zone, which is present as a very narrow zone around the weld nugget[50].…”

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Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy

Martín

Tiedra

Blanco

2019

Metall. Res. Technol.

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This work aims to study the effect of Widmanstätten h phase on tensile shear strength (TSS) of resistance spot welding joints (RSW) of A286 superalloy subjected to post-weld high temperature aging treatment. The tensile shear test specimens were welded in the solution treated condition, and then subjected to six different post-weld aging treatments (at an aging temperature of 840°C for six different aging times). The ascast dendritic microstructure of the weld nugget and the austenite equiaxed-grain microstructure of the base metal have a different response to the post-weld high temperature aging treatment. Growth of Widmanstätten h phase in the weld nugget is faster than in the base metal. While in the base metal the Widmanstätten h phase precipitates into the grain, in the weld nugget precipitates at the interdendritic region because of the segregation of Ti towards the last-to-solidify interdendritic regions (studied by performing SEM/EDX analysis). Although the hardness increases with the presence of Widmanstätten h phase, the increase in hardness does not necessarily imply an increase in the experimental TSS.

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Effect of metallurgical evolution during post-weld aging treatment on localised corrosion of resistance spot welding joints of A286 superalloy

Cited by 6 publications

References 50 publications

Effect of post-welding sensitisation on the degree of sensitisation of the welding zones of AISI 304 resistance spot welding joints studied by using an electrochemical minicell

Effect of post-welding sensitisation on the degree of sensitisation of the welding zones of AISI 304 resistance spot welding joints studied by using an electrochemical minicell

Resistance spot welding of Nimonic 263 nickel-based superalloy: microstructure and mechanical properties

Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy

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