Suppression of δ-ferrite formation on Al-Si coated press-hardened steel during laser welding

Abstract Laser oscillating welding was employed to fabricate Al-Si coated press-hardened steel (PHS) to improve the element homogeneity in the fusion zone. Three oscillation amplitudes that are 0 mm, 0.5 mm and 1.3 mm were studied in this present. Ni foil of 0.06 mm thickness was used as an interlayer between two tailored PHS welded. Welds defects was absent for any oscillation amplitudes, and weld width increased with increasing oscillation amplitudes. Compared to linear laser welding, Ni and Al had an uneven elemental profile due to strong stirring force, full martensite was achieved in fusion zone. However, δ-ferrite was present with oscillation amplitudes increased to 1.3 mm, since Ni content had a sharp descent compared to Al. Tensile srtength of welded joints was not influnced by altering oscillation amplitudes.

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Formation mechanism of δ -ferrite and metallurgy reaction in molten pool during press-hardened steel laser welding

Materials Letters ◽

10.1016/j.matlet.2017.07.008 ◽

2017 ◽

Vol 206 ◽

pp. 143-145 ◽

Cited By ~ 15

Author(s):

X.-N. Wang ◽

X.-M. Chen ◽

Q. Sun ◽

H.-S. Di ◽

Li-N. Sun

Keyword(s):

Laser Welding ◽

Formation Mechanism ◽

Molten Pool ◽

Hardened Steel ◽

Δ Ferrite

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Laser Welding of Coated Press-hardened Steel 22MnB5

Physics Procedia ◽

10.1016/j.phpro.2017.08.024 ◽

2017 ◽

Vol 89 ◽

pp. 139-147 ◽

Cited By ~ 2

Author(s):

Jukka Siltanen ◽

Ari Minkkinen ◽

Sanna Järn

Keyword(s):

Laser Welding ◽

Hardened Steel

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A review on the laser welding of coated 22MnB5 press-hardened steel and its impact on the production of tailor-welded blanks

Science and Technology of Welding & Joining ◽

10.1080/13621718.2020.1742472 ◽

2020 ◽

Vol 25 (6) ◽

pp. 447-467 ◽

Cited By ~ 2

Author(s):

M. Shehryar Khan ◽

M. H. Razmpoosh ◽

E. Biro ◽

Y. Zhou

Keyword(s):

Laser Welding ◽

Hardened Steel ◽

Tailor Welded Blanks

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Effects of Chemical Composition and Austenite Deformation on the Onset of Ferrite Formation for Arbitrary Cooling Paths

Metals ◽

10.3390/met8070540 ◽

2018 ◽

Vol 8 (7) ◽

pp. 540 ◽

Cited By ~ 2

Author(s):

Aarne Pohjonen ◽

Mahesh Somani ◽

David Porter

Keyword(s):

Phase Transformation ◽

Chemical Composition ◽

Hardened Steel ◽

Computational Method ◽

Alloying Elements ◽

Continuous Cooling Transformation ◽

Ferrite Formation ◽

Continuous Cooling ◽

Different Temperatures ◽

Range Of Values

We present a computational method for calculating the phase transformation start for arbitrary cooling paths and for different steel compositions after thermomechanical treatments. We apply the method to quantitatively estimate how much austenite deformation and how many different alloying elements affect the transformation start at different temperatures. The calculations are done for recrystallized steel as well as strain hardened steel, and the results are compared. The method is parameterized using continuous cooling transformation (CCT) data as an input, and it can be easily adapted for different thermomechanical treatments when corresponding CCT data is available. The analysis can also be used to obtain estimates for the range of values for parameters in more detailed microstructure models.

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Investigations on the Microstructure and the Fracture Surface of Pulsed Nd: YAG Laser Welding of AISI 304 Stainless Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.445.418 ◽

2012 ◽

Vol 445 ◽

pp. 418-423

Author(s):

Seyed Ali Asghar Akbari Mousavi ◽

A. Garehdaghi

Keyword(s):

Stainless Steel ◽

Laser Welding ◽

Cooling Rate ◽

304 Stainless Steel ◽

Chemical Compositions ◽

Operational Parameters ◽

Δ Ferrite ◽

Higher Power ◽

304 Austenitic Stainless Steel ◽

Pulsed Nd:Yag Laser Welding

The paper presents pulsed Nd:YAG laser welding of the 304 stainless steels. The welding tests were carried out with various operational parameters. The effects of laser welding variables on the geometry, microstructure and solidification of the weld are considered. The austenitic or ferritic solidification is produced in the 304 austenitic stainless steel depended upon the cooling rate and its chemical compositions. The possiblity of austenitic solidification compared with the ferritic solidification decreases with the chromium to nickel equivalent ratio and that increases with cooling rates. Moreover, more δ ferrite is obtained if the cooling rate is increased or the higher power laser is used. The surface of fracture samples was considered and the reason for failure was investigated. The study shows that the fracture is in ductile type.

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