Combined effect of resistance spot welding and precipitation hardening on tensile shear load bearing capacity of A286 superalloy

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

doi:10.1016/j.msea.2017.02.015

Cited by 39 publications

(20 citation statements)

References 44 publications

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“…The controlled parameters in the RSW process of the tensile shear test specimens were [28,29]: welding time (WT), welding current (WC), and electrode force (EF). The values of the welding parameters were fixed at WT = 0.36 s, WC = 6 kA and EF = 2300 N [17,24]; these values were chosen in order to maximize the weld nugget size, which increases with increasing heat input, and to minimize the effect of the expulsion phenomena, which is associated with an excessive heat input [30].…”

Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

“…Tensile shear tests were carried out, on a Shimadzu UH-F500 kNA universal testing machine, at a crosshead speed of 2 mm/min [24,32,33], which, as explained by Marashi et al [34], allows to consider the test as static. The tensile shear test specimens were prepared according to ISO 14273 [35].…”

Section: Tensile Shear Testingmentioning

confidence: 99%

“…where P is the predicted TSS (kN); f is a coefficient whose value, given the results obtained by Martín et al [24], was taken as 2.65, a value that is also consistent with those proposed by Sawhill and Baker [40] and by Radakovic and Tumuluru [41] for pullout failure mode, which, as will be seen later, is the failure mode shown by all the tensile shear test specimens; t is the sheet thickness (1 mm); d is the weld nugget diameter whose value was taken as 5.5 mm; and s R is the tensile strength (MPa) of the base metal, obtained in a tensile test conducted according to ISO 6892-1 [42], which is shown in Table 3. Although it must be mentioned that the tensile shear test is a fracture test on a specimen with a complex and notched geometry while the tensile test is a fracture test on a specimen with a smooth geometry, the predicted TSS obtained from equation (1) is appropriate to compare the different response to post-weld high temperature aging treatment of weld nugget and base metal although it simulates the behaviour of a "non-real" tensile shear test specimen where the weld nugget has the austenite equiaxed-grain microstructure of the base metal.…”

Section: Tensile Shear Testingmentioning

confidence: 99%

“…The general practice in welding superalloys is to employ a weaker, more ductile austenitic filler metal than the base metal to minimize weld cracking but, when the maximum joint strength is required, filler metal of base metal composition is recommended [22]. Thus, resistance spot welding (RSW), which is an autogenous welding process and is widely used for joining sheet steel in the automotive industry [23], can be an interesting method for welding A286 superalloy sheets [24].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

Section: Tensile Shear Testingmentioning

confidence: 99%

Section: Tensile Shear Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Para verificar a resistência dos pontos de solda no que concerne as propriedades mecânicas, o teste por tensão cisalhante é amplamente utilizado, como em estudos recentes de: Manladan et al [21]; Shan et al [22], Chen et al [23], Martín et al [24] e Feng et al [25]. Este consiste na aplicação de forças de separação nas duas chapas soldadas.…”

Section: Qualidade Da Solda a Ponto Por Resistência Elétrica Em Aços unclassified

Aplicação da Metodologia de Superfície de Resposta para Otimização do Processo de Solda a Ponto no Aço Galvanizado AISI 1006

et al. 2018

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Recebido: 08 Mar., 2018 Aceito: 16 Maio, 2018 E-mail: fferrazamaral@yahoo.com.br (FFA)Resumo: A soldagem a ponto por resistência elétrica possui um papel importante na fabricação de diversos produtos da indústria. Apesar de sua ampla aplicabilidade, este processo está sujeito a apresentar certa inconsistência na qualidade devido a variáveis controláveis e não controláveis. Desta forma, este estudo busca aplicar a metodologia de superfície de resposta para a obtenção de valores otimizados de fatores controláveis do processo, tais como corrente de soldagem, tempo de soldagem e força do eletrodo. Verificou-se o comportamento das curvas do deslocamento do eletrodo, a fim de observar o efeito da queima do revestimento das chapas de aço carbono galvanizadas. Avaliou-se também o teste de cisalhamento para verificar a deformação na força máxima de ruptura dos corpos de prova. Os resultados da aplicação mostraram que parâmetros elevados de corrente e parâmetros reduzidos dos tempos de ciclo proporcionaram maiores níveis de força e valores desejáveis de indentação. Além disso, foi possível verificar através dos experimentos que os critérios de qualidade do ponto de solda apresentam correlação com as características das curvas de deslocamento do eletrodo, proporcionando uma maneira eficaz para avaliar a qualidade do processo de solda a ponto a partir de testes não destrutivos.Palavras-chave: Solda a ponto por resistência elétrica; Metodologia de superfície de resposta; Otimização; Aço galvanizado; Deslocamento do eletrodo. Application of the Response Surface Methodology for Optimization of the Resistance Spot Welding Process in AISI 1006 Galvanized SteelAbstract: The resistance spot welding has a great importance in the manufacture of several industrial products. Despite its wide applicability, this process is subject to certain quality inconsistency due to controllable and non-controllable variables. Thus, this study seeks to apply the response surface methodology to obtain optimized values of controllable process factors, such as welding current, welding time and electrode strength. The behavior of the electrode displacement curves has been verified in order to observe the burning effect of the coating of the galvanized carbon steel plates. It was also evaluated the shear test to verify the tensile-shear strength of the specimens. The results of the application showed that high current parameters and reduced cycle time parameters provided higher levels of strength and desirable indentation values. In addition, it was possible to verify through the experiments that the quality criteria of the weld point correlate with the characteristics of the displacement curves of the electrode, providing an efficient way to evaluate the quality of the process of wel...

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Microstructure Evolution and Homogenization Kinetics of 15Cr–30Ni–Fe Heat‐Resistant Alloy

Zhang,

Shi,

Wang

et al. 2024

steel research int.

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The as‐cast microstructure, microsegregation of alloying elements, and microstructure evolution during homogenization of the newly designed 15Cr–30Ni–Fe heat‐resistant alloy are studied. Ti, Nb, Si, and Mo segregate at the interdendritic region. The brittle eutectic Laves phase contains Fe, Ti, Ni, Nb, Si, and Mo, which is identified as the Fe2Ti Laves phase. The activation energy for the Fe2Ti Laves phase dissolution is close to the activation energy for Ti diffusion in the γ matrix based on the Johnson–Mehl–Avrami–Kolmogorov analysis. The back‐diffusion of Ti to the γ matrix is the limiting step for the dissolution of Fe2Ti Laves phase. The kinetic equation of homogenization considering lattice parameters and pre‐exponential factor correction is established. After the double‐stage homogenization at 980 °C/10 h + 1140 °C/4 h, the volume fraction of the Laves phase decreases from 5.11% to 0.26%, and the large eutectic Laves phase is completely dissolved. The reduction in the standard deviation of microhardness at different soaking times effectively reflects the gradual decrease in the degree of microsegregation of alloying elements. The average grain size of the alloy after homogenization is 410 ± 63.1 μm, which is beneficial to control the further refinement of grain during the subsequent hot working.

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Combined effect of resistance spot welding and precipitation hardening on tensile shear load bearing capacity of A286 superalloy

Cited by 39 publications

References 44 publications

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

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

Aplicação da Metodologia de Superfície de Resposta para Otimização do Processo de Solda a Ponto no Aço Galvanizado AISI 1006

Microstructure Evolution and Homogenization Kinetics of 15Cr–30Ni–Fe Heat‐Resistant Alloy

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