Laser welding of dual-phase steels with different silicon contents: Phase evolutions, microstructural observations, mechanical properties, and fracture behavior

Mostaan, Hossein; Saeedpour, Parham; Ahmadi, Hossein; Nouri, Ashkan

doi:10.1016/j.msea.2021.140974

Cited by 21 publications

(11 citation statements)

References 29 publications

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“…The fusion zone (FZ) of laser-welded DP steel mainly consists of full martensite, and the microstructural characteristics in FZ differ with the heat input and element. [9][10][11][12][13] A low heat input and high welding speed resulted in a low width of softened HAZs. Welding speed was the main factor influencing the strength.…”

Section: Introductionmentioning

confidence: 99%

“…The elongation of the welded joints decreases with a decrease in the martensite content of the BMs. [12,13] It was previously reported that Ni foils, Ti foils, or Ni/Cu foil interlayers in the laser welding process were used to suppress brittle IMCs (mainly the brittle binary phase of Fe-Al) formed between the iron-based material and the aluminum alloy in the FZ. [14][15][16] Furthermore, adding Mo content was useful for grain refinement during welding.…”

Section: Introductionmentioning

confidence: 99%

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Role of Ni Content on Microstructure, Mechanical Property, and In‐Site Local Corrosion Behavior of Welded Joints Produced by Laser Welding of Dual‐Phase Steel

Zhai,

Liu,

et al. 2023

steel research int.

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In this study, the effects of Ni content on the microstructure, microhardness, and in‐site local corrosion behavior of laser‐welded joints in dual‐phase steel were investigated. The experimental results indicated that the microstructure of the fusion zone changed from martensite to austenite as the Ni content increased. The fusion zone (FZ) hardnesses of the 0Ni (no Ni foil addition) and 50Ni (50 μm Ni foil) welded joints were higher than that of the 100Ni (100 μm Ni foil) welded joints because of the austenite in the 100Ni welded joint. The welded joint without Ni showed severe pitting corrosion (more than 15 pitting sites in each zone of the welded joint) at the tested corrosion time. However, when immersed in the corrosion solution, the welded joints with added Ni exhibited slight pitting corrosion (less than 5 pitting sites). The Ni addition inhibited the pitting corrosion of the welded joints of high‐strength dual‐phase steel.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of Ni Content on Microstructure, Mechanical Property, and In‐Site Local Corrosion Behavior of Welded Joints Produced by Laser Welding of Dual‐Phase Steel

Zhai,

Liu,

et al. 2023

steel research int.

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“…The increase in the use of DP steels has led researchers to characterize the welding properties of these steels. Previous literatures have studied many aspects of laser welding and resistance spot welding of DP steels [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In order to maximize performance, combinations of dissimilar materials are used extensively in the automotive industry.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical properties of dissimilar SMAW process joints of DP Steels obtained by intercritical heat treatment from AISI 1010 steel

LAROUI,

Chegroune,

Hariti

et al. 2023

Preprint

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Dual phase steel is a kind of advanced high strength steel used in automotive industry to reduce a fuel consumption. The present study assesses the microstructural and mechanical behavior of a dissimilar butt-welded dual-phase steel by Shielded Metal Arc Welding process. The ferrite phase with variable martensite fraction from 27–70% was obtained by water quenching at different inter-critical temperatures from a plate carbon steel AISI 1010 having a microstructure consisting of ferrite and pearlite. The mechanical properties, strength and ductility of DP steels were influenced by martensite volume fraction (MVF). When MVF reached value of 70%, the strength was improved by 28% and the elongation was decreased by 25%. Additionally, the DP steels obey to the two-stage strain hardening behavior. The obtained DP steels were welded by a shield metal arc weld (SMAW) process in a single pass while maintaining a constant heat input. Systematic analysis of dissimilar welded joints, microstructure and microhardness, revealed that the fusion zones remain unchanged. Tensile test of weld joints showed lower ultimate tensile strength (UTS), elongation and strain hardening exponent compared to the dual phase (DP) steel. The DP700/DP900 welded joint have the highest ultimate tensile strength compared to the other welded joints due to its higher martensite volume fraction.

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“…Wang et al [9] studied the effect of heat inputs on microstructure and fracture behavior of laser welded joints of DP steels, the results showed that the microstructure of welded joints was similar, while the martensite decomposition and carbide precipitation gradually became significant with the increase of heat input, leading to the hardness decrease of the welded joint. Hossein Mostaan et al [10] investigated the microstructural observations, mechanical properties, and fracture behavior of laser welding of dual-phase steels with different silicon contents, they found that the fracture mechanism of DP steel with low martensite volume fraction and small ferrite grain size was microcavity formation, while the fracture mechanism of DP steel with high martensite volume fraction was separation and de-cohesion. Wang et al [11] studied the effect of martensite morphology and volume fraction on the lowtemperature impact toughness of dual-phase steels, and found that refining the lath martensite substructure can improve the impact toughness while the large-size ferrite grains in DP steels preferentially occur cleavage fracture.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and tear toughness of laser-welded DP980 dual phase steel

Huang

Ren

et al. 2022

Mater. Res. Express

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In this study, DP980 steel sheets were laser welded with a laser power of 4.5 kW and a welding speed of 4.5 m/min. The microstructural evolution and mechanical properties of the welded joint and the effect of notch location on tear toughness were evaluated. Results show that the fusion zone (FZ) was composed of lath martensite, the hardness (276 HV) of the heat-affected zone (HAZ) was lower than that of the base metal (305 HV) resulting from martensite tempering. The welded specimens failed at the soft HAZ with a 98.4% joint efficiency during the tensile test, and the ultimate tensile strength of the as-recieved steel and welded joint was 1026 MPa and 1010 MPa, respectively. The tear energy of the FZ and HAZ was lower than DP980 base metal (BM). Thus, it is considered that the fracture toughness of the joint decreased after welding. The crack growth path of the FZ gradually deviated toward the HAZ during tearing due to the asymmetrical plastic zone at the crack tip. Compared with the ductile fracture of the base metal, the significant decrease in the fracture toughness of the welded joint is due to the weak deformation resistance of tempered martensite.

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Laser welding of dual-phase steels with different silicon contents: Phase evolutions, microstructural observations, mechanical properties, and fracture behavior

Cited by 21 publications

References 29 publications

Role of Ni Content on Microstructure, Mechanical Property, and In‐Site Local Corrosion Behavior of Welded Joints Produced by Laser Welding of Dual‐Phase Steel

Role of Ni Content on Microstructure, Mechanical Property, and In‐Site Local Corrosion Behavior of Welded Joints Produced by Laser Welding of Dual‐Phase Steel

Microstructural and mechanical properties of dissimilar SMAW process joints of DP Steels obtained by intercritical heat treatment from AISI 1010 steel

Microstructure, mechanical properties and tear toughness of laser-welded DP980 dual phase steel

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