Development of Weld Metal Microstructures in Pulsed Laser Welding of Duplex Stainless Steel

Mirakhorli, Fatemeh; Ghaini, F. Malek; Torkamany, M.J.

doi:10.1007/s11665-012-0141-3

Cited by 47 publications

(30 citation statements)

References 10 publications

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“…Too much hardness inside the fusion and the heat-affected zones require higher pre-heat temperatures, slower cooling, and more complicated hydrogen controlled welding procedures [16]. The laser Nd:YAG process gives higher hardness values compared to other processes [20].…”

Section: Microscopic and Macroscopic Hardnessmentioning

confidence: 99%

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Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Xue

Péreira

Amorim

et al. 2017

Metals

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Abstract:Of particular importance and interest are the effects of pulsed Nd:YAG laser beam welding parameters on penetration and microstructure characterization of DP1000 butt joint, which is widely used in the automotive industry nowadays. Some key experimental technologies including pre-welding sample preparation and optimization design of sample fixture for a sufficient shielding gas flow are performed to ensure consistent and stable testing. The weld quality can be influenced by several process factors, such as laser beam power, pulse duration, overlap, spot diameter, pulse type, and welding velocity. The results indicate that these key process parameters have a significant effect on the weld penetration. Meanwhile, the fusion zone of butt joints exhibits obviously greater hardness than the base metal and heat affected zone of butt joints. Additionally, the volume fraction of martensite of dual-phase steel plays a considerable effect on the hardness and the change of microstructure characterization of the weld joint.

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Section: Microscopic and Macroscopic Hardnessmentioning

confidence: 99%

“…Pulsed Nd:YAG laser welding has especially attracted attention recently in many academic research and industry applications [13][14][15][16][17][18][19]. Tzeng [20] used zinc-coated steel and attempted to make a laser welding joint without gas-formed porosity.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Xue

Péreira

Amorim

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…e microstructure of the weld metal of a duplex stainless steel made with Nd:YAG pulsed laser was studied by Mirakhorli et al [128].…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

A Review on Melt‐Pool Characteristics in Laser Welding of Metals

Fotovvati

Wayne

Lewis

et al. 2018

Advances in Materials Science and Engineering

142

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Laser welding of metals involves with formation of a melt-pool and subsequent rapid solidification, resulting in alteration of properties and the microstructure of the welded metal. Understanding and predicting relationships between laser welding process parameters, such as laser speed and welding power, and melt-pool characteristics have been the subjects of many studies in literature because this knowledge is critical to controlling and improving laser welding. Recent advances in metal additive manufacturing processes have renewed interest in the melt-pool studies because in many of these processes, part fabrication involves small moving melt-pools. e present work is a critical review of the literature on experimental and modeling studies on laser welding, with the focus being on the influence of process parameters on geometry, thermodynamics, fluid dynamics, microstructure, and porosity characteristics of the melt-pool. ese data may inform future experimental laser welding studies and may be used for verification and validation of results obtained in future melt-pool modeling studies.

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“…Mirakhorli et al 13 realized pulsed laser welding of 2-mm-thick SAF 2205 DSS. The solidification pattern of the weld metal was found to change with the travel speed and/or frequency because of variations in the overlap factor.…”

Section: Mourad Et Almentioning

confidence: 99%

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

Lima¹,

Carvalho

Teleginski

et al. 2015

Mat. Res.

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Duplex stainless steels have been extensively used in parts that are subject to corrosive environments and that have high mechanical strength requirements. Welding usually distorts the well-balanced austenite-ferrite ratio, and can produce brittle intermetallic phases; therefore, post-welding heat treatments are usually required. For applications where post-welding treatments are not possible, low heat input methods, such as micro-tungsten inert gas welding (TIG) and laser beam welding (LBW), can be used. The present investigation analyzed the microstructure, mechanical, and corrosion properties of 2507-classduplex steel tubes after welding. The microstructures of the heat-affected zones and the fusion zones contained variable amounts of ferrite and austenite. In the heat-affected and fusion zones in the TIG samples, the microstructures were primarily composed of ferrite grains with allotriomorphic austenite at the grain boundaries, intragranular Widmanstätten needles and plate-like precipitates. The LBW samples showed much finer microstructures, which contained austenite in the grain boundaries and fine austenite precipitates in the ferrite grains. Deleterious intermetallic phases, such as σ-phases, were not observed using X-ray diffraction. The tensile strength properties were very similar for the TIG and LBWsamples, reaching tensile strengths of approximately 840 MPa and total elongations between 61 and 87%. The heat-affected zone of the TIG welds were particularly susceptible to corrosion (0.05 mm/year) compared to the base metal (0.007 mm/year) and the laser welds (0.01 mm/year). Therefore, laser welding is a promising technique for the welding of 2507-class duplex tubes.

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Development of Weld Metal Microstructures in Pulsed Laser Welding of Duplex Stainless Steel

Cited by 47 publications

References 10 publications

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

A Review on Melt‐Pool Characteristics in Laser Welding of Metals

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

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