Influence on the microstructure of laser beam welds of high-strength steels

Völkers, Stephan; Somonov, Vladislav; Böhm, Stefan; Niendorf, Thoralf

doi:10.1007/s41777-017-0034-0

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Through the dilution effect of filler wire and the enhancement of the flow of the molten pool, the content and distribution of δ-ferrite decreased, which improved the mechanical properties of the welded joint. VÖLKERS et al [17] applied ultrasonic-coupled laser welding to inhibit the Al segregation in the fusion zone. Khan et al [18] depressed the formation of δ-ferrite by coating colloidal graphite onto the surface of 22MnB5 steel to reduce the concentration of δ-ferrite.…”

Section: Introductionmentioning

confidence: 99%

Improving the Microstructure and Mechanical Properties of Laser-Welded Al–Si-Coated 22MnB5/Galvanized Steel Joints Added by Nickel

Zhang,

Qin,

Zhao

et al. 2023

Metals

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To weaken the harm of Al–Si coating and increase the strength of welded joints, variable thicknesses of Ni foil (Ni, an austenitic formation element) were added to the lap laser welding Al–Si-coated 22MnB5 hot stamping steel/galvanized steel joints. The joints’ weld appearance, microstructure, and mechanical properties were explored. The weld altered from an X shape to a Y shape with an increased thickness of Ni foil. During welding, Al–Si coating was melted and diluted into the welding pool, forming δ-ferrite (a rich-Al phase with low toughness and strength) in the fusion zone (FZ) and fusion boundary (FB). This phase deteriorated the strength of the joints. After adding Ni, the amount and size of the δ-ferrite phase decreased. With a significant thickness of Ni foil, δ-ferrite disappeared. However, a new phase (fresh martensite (FM), which formed at low temperature and contained rich Ni) probably formed, except PM (previous martensite (PM), which formed at high temperature and contained little Ni or no Ni). The heat-affected zone (HAZ) on the side of 22MnB5 comprised a coarse martensite zone, refined martensite zone, martensite + ferrite zone, and tempered martensite zone from the FZ to the basic material. HAZ on the side of galvanized steel mainly contained ferrite and pearlite. After adding the Ni foil, the strength of the joint was greater than that without Ni. The maximum strength of the joint can be up to 679 MPa because of the disappearance of δ-ferrite. Meanwhile, the toughness of the joint increased. The fracture mode was from three mixed fractures (cleavage, quasi-cleavage, and dimple) to one fracture (dimple).

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Section: Introductionmentioning

confidence: 99%

Improving the Microstructure and Mechanical Properties of Laser-Welded Al–Si-Coated 22MnB5/Galvanized Steel Joints Added by Nickel

Zhang,

Qin,

Zhao

et al. 2023

Metals

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“…Another viable method of solving the problem is to superimpose mechanically induced vibrations on the welding process. As such, Völkers et al [ 14 ] investigated this method with stationary soundwave coupling and came to the conclusion that the introduced vibrations lead to a significantly more homogeneous distribution of aluminum and silicon within the weld metal. The stationary position of the mechanically induced oscillations, however, does not allow for a constant influence during the welding process since the distance between the weld pool and the soundwave coupling changes continuously.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Weldability at Laser Beam Welding of 22MnB5 by an Entrained Ultrasonic Wave Superposition

et al. 2022

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In this paper, the potential of directional ultrasonic wave superposition by moving sound generators for laser beam welding of high-strength steel alloys 1.5528 (22MnB5) is studied. Steel sheets of identical thickness and in form of tailored blanks were joined in butt joint configuration. The influences of the various excitation parameters of the moving sound generators on the ultrasonic coupling and their influence on the distribution of the AlSi coating components within the melting zone and the weld seam characteristics are investigated. Etched cross-sections, scanning electron microscopy, energy dispersive X-ray spectroscopy, and electron backscattering measurements were used as the investigation methods to determine the AlSi distribution in the weld as well as its microstructure. The results presented a series of experiments which show that a suitable superposition of ultrasonic waves by the moving sound generators lead to a more homogeneous distribution of AlSi particles in the melt as well as to a finer microstructure within the weld, which improves the mechanical–technological properties.

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“…Through the dilution effect of filler wire and the enhancement of the flow of the molten pool, the content and distribution of δ-ferrite decreased which improved the mechanical properties of the welded joint. VÖLKERS et al [14] applied an ultrasonic coupled laser welding to inhibit the Al segregation in the fusion zone. Khan et al [15] depressed the formation of δ-ferrite by coating colloidal graphite on the surface of 22MnB5 steel to reduce the concentration of δ-ferrite.…”

mentioning

confidence: 99%

Improving the Microstructure and Mechanical Properties of Laser Welded Al-Si Coated 22MnB5/ Galvanized Steel Joint Added by Nickel

Zhang¹,

Qin²,

Qi³

2023

Preprint

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To weaken the harm of Al-Si coating and increase the strength of welded joint, variable thickness of Ni foil (Ni, an austenitic formation element) was added into the lap laser welding Al-Si coated 22MnB5 hot stamping steel/galvanized steel joints. The joints' weld appearance, microstructure, and mechanical properties were explored. The weld altered from X-shape to Y-shape with the increased thickness of Ni foil. During welding, Al-Si coating was melted and diluted into the welding pool, forming δ-ferrite (a rich-Al phase with low toughness and strength) in FZ and FB. This phase deteriorated the strength of the joints. After adding Ni, the amount and size of the δ-ferrite phase decreased. With a significant thickness of Ni foil, δ-ferrite would disappear. However, a new phase (FM, rich-Ni phase) probably formed except PM(a no or negligible Ni phase). The heat-affected zone (HAZ) on the side of 22MnB5 comprised a coarse martensite zone, refined martensite zone, martensite+ferrite zone, and tempered martensite zone from the FZ to the basic material. HAZ on the side of galvanized steel mainly contained ferrite and pearlite. After adding Ni foil, the strength of the joint was more than that without Ni. The maximum strength of the joint can be up to 679MPa because of the disappearance of δ-ferrite. Meanwhile, the toughness of the joint increased. The fracture mode was from three mixed fractures(cleavage, quasi-cleavage, and dimple) to one fracture(dimple).

show abstract

Influence on the microstructure of laser beam welds of high-strength steels

Cited by 4 publications

References 4 publications

Improving the Microstructure and Mechanical Properties of Laser-Welded Al–Si-Coated 22MnB5/Galvanized Steel Joints Added by Nickel

Improving the Microstructure and Mechanical Properties of Laser-Welded Al–Si-Coated 22MnB5/Galvanized Steel Joints Added by Nickel

Enhancement of Weldability at Laser Beam Welding of 22MnB5 by an Entrained Ultrasonic Wave Superposition

Improving the Microstructure and Mechanical Properties of Laser Welded Al-Si Coated 22MnB5/ Galvanized Steel Joint Added by Nickel

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