Effects of nitrogen in shielding gas on microstructure evolution and localized corrosion behavior of duplex stainless steel welding joint

Zhang, Zhiqiang; Jing, Hongyang; Xu, Lianyong; Han, Yongdian; Zhao, Lei; Zhou, Chao

doi:10.1016/j.apsusc.2017.01.252

Cited by 88 publications

(46 citation statements)

References 68 publications

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“…Duplex stainless steel (DSS) is a group of steels used in the chemical, marine and petrochemical industry due to its corrosion resistance comparable to austenitic steels, moderate cost and good mechanical properties [1]. DSS consist of nearly equal amounts of ferrite and austenite phase at room temperature [2].…”

Section: Introductionmentioning

confidence: 99%

Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

Landowski

2019

Advances in Materials Science

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Laser welding is used in modern industry, having many advantages comparing to traditional welding technologies. Nowadays, industry sectors such as shipbuilding, automotive and aviation can’t be imagined without laser processing technologies. Possibility of increase of welded joint properties, autogenous welding and high level of process automation makes the technology of laser welding perspective part of the industry. Physical multidimensional processes complexity requires a deeper understanding of the impact of laser welding parameters on the quality of welded joints for industrial implementation. The paper presents results of microstructure investigations of laser beam welded stainless steel under various welding parameters. Welded joints was achieved by Ytterbium fiber laser type without the use of the filler material. Material for test was 2205 ferritic-austenitic duplex stainless steel (DSS) plates with thickness of 8 mm in delivery condition. The objectives of this research was to investigate influence of laser welding parameters on weld geometry of butt-welded joints. Investigations of bead shape revealed correlation between laser beam focus position and weld penetration depth.

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Section: Introductionmentioning

confidence: 99%

Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

Landowski

2019

Advances in Materials Science

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“…An example of this appears in the heat-affected zone (HAZ) and the fusion zone (FZ), where the microstructure undergoes rapid cooling and heating cycles that result in changes in the orientation and size of the ferritic grain, as well as in excessive amount of ferrite. Previous research reported that austenite contents of less than 30% are inadequate for most industrial applications [14][15][16][17]. Ravisankar et.al.…”

mentioning

confidence: 99%

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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“…As a promising joining technology, high-power deep penetration laser welding has been used to weld thick plate of metals [1][2][3][4][5][6]. Shielding gas used in welding process plays an important role in influencing weld performance, including weld geometry, weld appearance, microstructure, and so on [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The nitrogen shielding gas enhanced and promoted a dendritic structure in the weld metal, and accordingly the weld hardness was higher. During welding of duplex stainless steel, the corrosion resistance of the argon containing nitrogen shielded weld of was improved comparing with that of the 100 % argon shielded weld [9]. During welding of 304 stainless steel, the corrosion resistance of the 100 % nitrogen shielded weld of 304 stainless steel was decreased [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon dioxide shielding gas on microstructure and corrosion property of welds

Zhou

Xiao

et al. 2019

Materialwissenschaft Werkst

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The microstructures and corrosion properties of weld joints are studied during 10 kW high power fiber laser welding of 304 stainless steel with shielding gases of 100 % argon, 80 % argon containing 20 % carbon dioxide and 100 % carbon dioxide, respectively. As the content of carbon dioxide in argon shielding gas increases from 0 % to 20 % then to 100 % during 10 kW high power fibre laser welding, the interdendritic δ‐ferrite in weld joints changes from lathy, short strip and trivial structures to thick‐long strip with short secondary dendrite arms then to skeletal‐network structure. Oxide inclusions, observed in 100 % carbon dioxide shielded weld, promote the formation of the skeletal‐network structure of δ‐ferrite and the homogenization of chromium and nickel in weld joint. The 100 % argon shielded weld joint has a highest initial corrosion current density, the 80 % argon containing 20 % carbon dioxide shielded weld has a lowest pitting potential, while the 100 % carbon dioxide shielded weld has a highest initial corrosion potential. The microstructures and element distribution play important role in determining the corrosion properties of the weld joints.

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Effects of nitrogen in shielding gas on microstructure evolution and localized corrosion behavior of duplex stainless steel welding joint

Cited by 88 publications

References 68 publications

Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

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

Influence of carbon dioxide shielding gas on microstructure and corrosion property of welds

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