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

X. N. Wang; X. M. Chen; Q. Sun; H. S. Di; Li N. Sun

doi:10.1016/j.matlet.2017.07.008

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

X. N. Wang^*
, X. M. Chen
, Q. Sun
, H. S. Di
, Li N. Sun

^*Corresponding author for this work

Soochow University
Northeastern University China

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

Al-Si coated press-hardened steel (PHS) welding was carried out using fiber laser with Ar and air atmospheres under different atmospheres. The formation mechanism of δ-ferrite in welded seam (WS) was: the melting Al-Si coating diffused into molten pool such that the stabilization of high-temperature δ-ferrite was improved as well as the phase transformation (δ → γ) was restrained by the effect of laser rapid cooling. Al-content in δ-ferrite of WS with Ar atmospheres was more than air atmospheres, leading to less δ-ferrite. A few of oxygen and nitrogen were ionized and droplet reaction zone with strong dissolution did not occur during laser lap welding, so welding defects were not obtained. Moreover, O element reacted with Al in the molten pool to form oxides of less than 1 μm (Al₂O₃), it did not deteriorate the properties of WS.

Original language	English
Pages (from-to)	143-145
Number of pages	3
Journal	Materials Letters
Volume	206
DOIs	https://doi.org/10.1016/j.matlet.2017.07.008
State	Published - 1 Nov 2017
Externally published	Yes

Keywords

Laser processing
Microstructure
Press-hardened steel
Welding
δ-Ferrite

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10.1016/j.matlet.2017.07.008

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@article{b13ec851361f4a5798d1f69bf68a9006,

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

abstract = "Al-Si coated press-hardened steel (PHS) welding was carried out using fiber laser with Ar and air atmospheres under different atmospheres. The formation mechanism of δ-ferrite in welded seam (WS) was: the melting Al-Si coating diffused into molten pool such that the stabilization of high-temperature δ-ferrite was improved as well as the phase transformation (δ → γ) was restrained by the effect of laser rapid cooling. Al-content in δ-ferrite of WS with Ar atmospheres was more than air atmospheres, leading to less δ-ferrite. A few of oxygen and nitrogen were ionized and droplet reaction zone with strong dissolution did not occur during laser lap welding, so welding defects were not obtained. Moreover, O element reacted with Al in the molten pool to form oxides of less than 1 μm (Al2O3), it did not deteriorate the properties of WS.",

keywords = "Laser processing, Microstructure, Press-hardened steel, Welding, δ-Ferrite",

author = "Wang, \{X. N.\} and Chen, \{X. M.\} and Q. Sun and Di, \{H. S.\} and Sun, \{Li N.\}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

month = nov,

day = "1",

doi = "10.1016/j.matlet.2017.07.008",

language = "英语",

volume = "206",

pages = "143--145",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Formation mechanism of δ-ferrite and metallurgy reaction in molten pool during press-hardened steel laser welding

AU - Wang, X. N.

AU - Chen, X. M.

AU - Sun, Q.

AU - Di, H. S.

AU - Sun, Li N.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Al-Si coated press-hardened steel (PHS) welding was carried out using fiber laser with Ar and air atmospheres under different atmospheres. The formation mechanism of δ-ferrite in welded seam (WS) was: the melting Al-Si coating diffused into molten pool such that the stabilization of high-temperature δ-ferrite was improved as well as the phase transformation (δ → γ) was restrained by the effect of laser rapid cooling. Al-content in δ-ferrite of WS with Ar atmospheres was more than air atmospheres, leading to less δ-ferrite. A few of oxygen and nitrogen were ionized and droplet reaction zone with strong dissolution did not occur during laser lap welding, so welding defects were not obtained. Moreover, O element reacted with Al in the molten pool to form oxides of less than 1 μm (Al2O3), it did not deteriorate the properties of WS.

AB - Al-Si coated press-hardened steel (PHS) welding was carried out using fiber laser with Ar and air atmospheres under different atmospheres. The formation mechanism of δ-ferrite in welded seam (WS) was: the melting Al-Si coating diffused into molten pool such that the stabilization of high-temperature δ-ferrite was improved as well as the phase transformation (δ → γ) was restrained by the effect of laser rapid cooling. Al-content in δ-ferrite of WS with Ar atmospheres was more than air atmospheres, leading to less δ-ferrite. A few of oxygen and nitrogen were ionized and droplet reaction zone with strong dissolution did not occur during laser lap welding, so welding defects were not obtained. Moreover, O element reacted with Al in the molten pool to form oxides of less than 1 μm (Al2O3), it did not deteriorate the properties of WS.

KW - Laser processing

KW - Microstructure

KW - Press-hardened steel

KW - Welding

KW - δ-Ferrite

UR - https://www.scopus.com/pages/publications/85021698077

U2 - 10.1016/j.matlet.2017.07.008

DO - 10.1016/j.matlet.2017.07.008

M3 - 文章

AN - SCOPUS:85021698077

SN - 0167-577X

VL - 206

SP - 143

EP - 145

JO - Materials Letters

JF - Materials Letters

ER -

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

Abstract

Keywords

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