Microstructure and Mechanical Properties of Laser Welded Al-Si Coated 22MnB5 Hot Stamping Steel and Galvanized Steel

Zhang, Danfeng; Qin, Youqiong; Zhao, Feng; Ma, Liangping

doi:10.1007/s11665-021-06291-1

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…The Al-Si coating thickness of 22MnB5 steel is about 30μm, and the coating thickness of galvanized steel is about 10μm. The Al-Si coating consists of α-Fe (Al, Si), Fe2(Al, Si)5 and Fe(Al, Si), named I, II and III zones in Figure 2a, samed as references [16,17]. For the GA coating, it is primarily composed of two regions, Region Ⅳ was Fe3Zn10(Γ), Fe5Zn21(Γ1), and region Ⅴ was FeZn10 (δ), FeZn13(ζ) as shown in Figure 2b, samed as references [18,19].…”

Section: Experimental Materials and Proceduresmentioning

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).

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Section: Experimental Materials and Proceduresmentioning

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

View full text Add to dashboard Cite

show abstract

“…The laser wavelength was 1060-1080 nm, the minimum focusing spot size was The Al-Si coating thickness of 22MnB5 steel is about 30 µm, and the coating thickness of galvanized steel is about 10 µm. The Al-Si coating consists of α-Fe (Al, Si), Fe 2 (Al, Si) 5 , and Fe (Al, Si), named I, II, and III zones in Figure 2a, same as references [19,20]. The GA coating is primarily composed of two regions.…”

Section: Experimental Materials and Proceduresmentioning

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

Self Cite

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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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Effect of Filler Wire on Laser Lap Welding of Al-Si Coated 22MnB5 Hot Stamping Steel

Zhao

Qin

Zhang

et al. 2022

J. of Materi Eng and Perform

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Microstructure and Mechanical Properties of Laser Welded Al-Si Coated 22MnB5 Hot Stamping Steel and Galvanized Steel

Cited by 9 publications

References 28 publications

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

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

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

Effect of Filler Wire on Laser Lap Welding of Al-Si Coated 22MnB5 Hot Stamping Steel

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