Mechanical and microstructural evaluation of SAF 2507 and incoloy 825 dissimilar welds

Kangazian, Jalal; Shamanian, M.

doi:10.1016/j.jmapro.2017.03.006

Cited by 54 publications

(18 citation statements)

References 37 publications

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“…Duplex stainless steel (DSS) derives its name from the stable microstructure at room temperature, which consists of approximately 50% austenite phase (γ) and 50% ferrite phase (δ). This microstructure has a favorable combination of mechanical and anticorrosive properties, ensuring high levels of high-temperature resistance, optimum toughness, and ductility [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The welding processes used to join this type of material promote variations to the dual percentage of ferrite-austenite, because the microstructural heterogeneity generated by the thermal gradients can locally generate microstructural changes, influencing the mechanical behavior of the joint [3][4][5][6]. Controlling this dual percentage is of great importance to the maintenance of the mechanical properties, especially of the corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…analyzed the influence of cooling rates on microstructure evolution and pitting corrosion in the simulated heat-affected zone of 2304 LDSS and found that with resistance in the simulated HAZ of 2304 LDSS, the ferrite phase content increased gradually as the cooling rate increased [18,19].The constant development of various applications employing duplex stainless steels used in the chemical, petrochemical, nuclear, and energy industries, among others, demands the adaptation of materials that meet the required service conditions, thus, promoting the development of hybrid structures with dissimilar metals (i.e., welding between stainless steels) and combining their respective advantages. However, dissimilar metal welding is often accompanied by a series of problems, such as secondary phase formation, and the distribution of dissimilar metal weld in the fusion zone, which must be controlled [3,20].Various experiment design techniques (DoE) are currently employed in a variety of applications, with the purpose of identifying parameters associated with a process and determining its optimal configuration to improve process capabilities and performance. One of the most employed DoE techniques is the full factorial design, where the variables' effect is analyzed for a certain response.…”

mentioning

confidence: 99%

“…The constant development of various applications employing duplex stainless steels used in the chemical, petrochemical, nuclear, and energy industries, among others, demands the adaptation of materials that meet the required service conditions, thus, promoting the development of hybrid structures with dissimilar metals (i.e., welding between stainless steels) and combining their respective advantages. However, dissimilar metal welding is often accompanied by a series of problems, such as secondary phase formation, and the distribution of dissimilar metal weld in the fusion zone, which must be controlled [3,20].…”

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confidence: 99%

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Maintenance of the Austenite/Ferrite Ratio Balance in GTAW DSS Joints Through Process Parameters Optimization

Rodriguez¹,

Miranda²,

González

et al. 2020

Materials

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The present work describes the influence of the parameters employed in the gas tungsten arc welding process (GTAW) when nickel powder is used as a filler metal in 2304/2507 duplex stainless-steel dissimilar joints. Multi-objective optimization was applied in order to maintain the austenite/ferrite percentage in the welded zone. A microstructural and phase quantification analysis was performed in each sample through optical and scanning electron microscopes. It was found that a nickel powder addition combined with low heat input increased the biphasic ratio across the different zones of the dissimilar welded samples. Although the austenite volume fraction increased in the 2304 heat-affected zone (HAZ) near to 25%, it was not sufficient according to international standards. The obtained results led to the maintenance of the 50/50 phase percentage in the 2507 HAZ welded joint side, as well as to the increment of the austenite percentage in the 2304 HAZ.Materials 2020, 13, 780 2 of 14 temperatures, another phenomenon is observed: ferrite decomposition occurs, causing the formation of harmful secondary phases, such as sigma (σ), chi (χ), carbides, and nitrides phases, which subsequently deteriorate the mechanical and corrosion-resistance properties of the DSS. Santos et al. conducted a study, based on the analysis of thermal history, which showed the temperature measured across the weld and its effect on the microstructural and mechanical behavior, and compared the results with the three-dimensional finite element model built. In addition, Sarlak, Atapour, and collaborators specifically studied the corrosion behavior across the welding in samples obtained by the welding process of a lean duplex stainless steel (LDSS) and its effect on the microstructure [9][10][11].Various joining techniques, such as plasma, laser, tungsten inert gas (TIG), and gas metal arc welding (GMAW) are being developed to meet the requirements demanded by these materials, avoiding distortion. However, ferritization is a problem with these processes. In addition, the effect generated by the entry of heat into these materials is a research topic. Plasma arc welding has beneficial results for DSS, which is situated at a controlled heat input and an acceptable ferrite ratio compared with other processes. Flux-cored arc welding (FCAW) has gradually attracted strong attention in welding DSS due to its higher welding efficiency compared with the gas tungsten arc welding process (GTAW) process. However, studies on the microstructure, mechanical properties, and corrosion resistance of the DSS FCAW joint are limited. Advanced laser hybrid welding has a great advantage for DSS, because it reduces heat input and distortion level compared with SAW and FCAW [12,13]. The GTAW is a welding procedure that has been employed efficiently in past years to weld materials such as stainless steels due to its facility to produce sound joints that meet specific requirements of industries, added to its facility to work when thin materials are required. However, it has be...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Maintenance of the Austenite/Ferrite Ratio Balance in GTAW DSS Joints Through Process Parameters Optimization

Rodriguez¹,

Miranda²,

González

et al. 2020

Materials

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“…However, compared to Ni-based alloys, the operating temperature of duplex stainless steels (or super duplex stainless steels) is relatively low (up to about 300 °C) due to precipitation of several secondary phases i.e chromium nitrides, chi and sigma. For this reason, Hastelloy C-276 alloy and SAF 2205 dissimilar welding joints are used in the transition from high temperature sections to medium high temperature environments [9,10]. In this study, initially, a metallurgical analysis of dissimilar weld joints of SAF 2205 and Hastelloy C-276 was done and then notched impact fracture behaviour of the joints were investigated throughout their microstructural features.…”

Section: Introductionmentioning

confidence: 99%

A Fractographical Study on Dissimilar Weld Joints of SAF 2205 and Hastelloy C-276

et al. 2018

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Abstract. In this study, a dissimilar weld joint between SAF 2205 and Hastelloy C-276 was manufactured by using gas tungsten arc welding and its notched impact fracture behaviour was investigated. Initially, V-type welding mouth was opened and the welding was performed by multi-pass. In welding procedure, ERNiCrMo-3 material used as a filler metal and the heat input was varied between 0.48-1.10 kJ/mm depending on welding parameters. Both welding pool and root zone were protected by an argon atmosphere. Multi notched impact tests were performed at room temperature. Weld metal had an impact toughness value as 92 J and its fracture surface exhibited several oriented cracking paths due to its solidified structure. The impact toughness value was measured as 82 J for heat affected zone of SAF 2205 and its fractograph reflected the coarser and deeper dimples. Heat affected zone of nickel based alloy had the highest impact toughness value as 116 J among the studied joints due to the more plastic deformation capability of nickel having face centered cubic structure, however, its fracture surface under impact loading exhibited several cracks propagating throughout the fusion line having equiaxed dendrites.

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On the Joining of High‐Strength Dissimilar Inconel 600 and SS316L Materials by Friction Stir Welding with Improved Mechanical Properties and Localized Corrosion Resistance

Raj,

Biswas,

Vadani

et al. 2024

Adv Eng Mater

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The present work thoroughly investigates the friction stir welding of dissimilar high‐strength materials Inconel 600 (IN600) and SS316L and its effect on welded microstructure, mechanical, and corrosion properties. The microstructure and crystallographic textures of the nugget zone are investigated using the electron backscattered diffraction technique and transmission electron microscopy. The mechanical properties of the joints are evaluated using hardness and tensile testing and the electrochemical behavior of the joints is also investigated. The microstructural examination reveals a high degree of material plastic flow, both IN600 and SS316L, in the weld zone with uniform distribution of fine M23C6 carbides. The weld zone comprises a dynamically recrystallized fine‐grained structure of γ‐Fe and γ‐Ni that results in improved mechanical properties and high weld efficiency (≈95%) of the joints. The fine microstructure in the weld zone is characterized by a high dislocation density in these low stacking fault materials. The electrochemical results show that the corrosion resistance of the cross‐sectional region is higher than the top surface region and lower than the base IN600. The combined effect of grain refinement, high degree of material intermixing, and distribution of fine carbide precipitates cumulatively is found responsible for the improved corrosion resistance of the nugget zone.

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Mechanical and microstructural evaluation of SAF 2507 and incoloy 825 dissimilar welds

Cited by 54 publications

References 37 publications

Maintenance of the Austenite/Ferrite Ratio Balance in GTAW DSS Joints Through Process Parameters Optimization

Maintenance of the Austenite/Ferrite Ratio Balance in GTAW DSS Joints Through Process Parameters Optimization

A Fractographical Study on Dissimilar Weld Joints of SAF 2205 and Hastelloy C-276

On the Joining of High‐Strength Dissimilar Inconel 600 and SS316L Materials by Friction Stir Welding with Improved Mechanical Properties and Localized Corrosion Resistance

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