Microstructure and fatigue properties of fiber laser welded dissimilar joints between high strength low alloy and dual-phase steels

Parkes, D.; Xu, Wangqiong; Westerbaan, D.; Nayak, S.S.; Zhou, Y.; Goodwin, Frank; Bhole, S.D.; Chen, D.L.

doi:10.1016/j.matdes.2013.04.076

Cited by 90 publications

(49 citation statements)

References 28 publications

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“…The width of FZ and HAZ of laser welding joints was narrower than that of manufactured by traditional welding method, mainly due to the lower heat input [Zhang et al, 2013 andSokolov et al, 2011] and higher power density 10 6 W/cm 2 [Roncery et al, 2012 andMoosavy et al, 2014] of the laser welding compared to those of the traditional welding technologies. The microstructure of welded joint was strongly dependent on the peak temperature and cooling rate during the welding process [Parkes et al, 2013 andNayaka et al, 2012], which varied with the distance to the center of the FZ. As for the NPS steel, the critical cooling rate for martensite formation was about 40 o C/s.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Wang

Chen

Wang

et al. 2015

Journal of Materials Processing Technology

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Section: Microstructure Evolutionmentioning

confidence: 99%

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Wang

Chen

Wang

et al. 2015

Journal of Materials Processing Technology

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“…Due to the low carbon and alloying element content, BH steels have mainly ferritic microstructure. This microstructure is the consequence of lower strength, but better formability and weldability compared to DP steels [4,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…FZ and HAZ are characterized by increased hardness and decreased plastic properties. The welding process influences the weld imperfections, which are related to the weld geometry such as concavity, sagging, impurities or gaseous elements, porosity, pinholes or craters [13,14,24]. Several works were devoted to the laser welding of different DP steels, but fewer works were focused on welding of DP steels with BH steels.…”

Section: Introductionmentioning

confidence: 99%

“…Some authors studied the effect of hardness increase in the FZ and HAZ in DP steels after laser welding process on the properties of joints. The higher hardness causes reduction of formability and even significant lack of toughness [3,4,[13][14][15]. Several authors described the reduction of hardness in the tempered region of HAZ; a phenomenon is generally known as HAZ softening.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure of fibre laser welded joint of dual phase steel with bake hardening steel

Švec¹,

Schrek²,

Dománková³

2016

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The fibre laser welding of dual phase DP600 steel and bake hardening BH220 steel were studied with a concentration on the microstructure of butt joints, but microhardness and tensile properties were also measured. The temperature peaks influenced the microstructure of the fusion zone and heat affected zone. The microstructure in the fusion zone was predominantly built of acicular ferrite with small areas of upper and lower bainite, and martensite. The similar microstructure was observed in the heat affected zone near DP600 steel. The microstructure in the heat affected zone near BH220 steel consisted mostly of coarse ferrite and acicular ferrite. The microhardness increased in the fusion zone and in the heat affected zone near DP600 steel, which was the consequence of martensite and bainite formation in these areas. The tensile strength of the fibre laser welded joints exceeded the strength of the BH220 steel base material with failure occurring in this steel.K e y w o r d s : dual phase steel, bake hardening steel, fibre laser welding, microstructure, microhardness

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“…Some works have already studied the effect of several welding techniques on TWIP steel grades, such as laser, arc, and resistance spot welding. [14][15][16][17][18] Researches have also been carried out on dissimilar welding of AHSS sheets, [16,[19][20][21][22][23] but very few ones concerned with TWIP steels. [16,21,24,25] In these studies, it was found that, if no filler metal is used, brittle a-martensite bands can occur in the fusion zone between a TWIP steel and a low-alloy one, due to the intermediate chemical composition in this zone, [21] and hence the use of an austenitic steel as a filler was suggested in order to yield a fully austenitic fusion zone.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Metal Active Gas Welding of TWIP and DP Steel Sheets

Spena

Matteis

Scavino

2014

steel research int.

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In the last years, TWIP steels have been proposed for the fabrication of car-body components, due to their excellent combination of strength and toughness. However, a widespread usage of these steels for such applications is conditional on the employment of dissimilar welding with other automotive high-strength steel grades. In this study, dissimilar butt weld seams of TWIP and Dual Phase steel sheets fabricated by metal active gas welding are examined. The microstructural and mechanical characterization of the welded joints were carried out by optical metallography, microhardness, tensile testing, and fractographic examination. The heat affected zone on the TWIP side was fully austenitic and the only detectable effect was grain coarsening; on the dual phase side new martensite formed close to the fusion zone, while ferrite, and tempered martensite occurred away from the fusion zone. The welded tensile specimens exhibit a plastic behavior influenced by the TWIP steel, even though with more limited tensile strengths and elongation at fractures. The tensile specimens predominantly broke within the weld seams, with the fractures surfaces being ductile.

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Microstructure and fatigue properties of fiber laser welded dissimilar joints between high strength low alloy and dual-phase steels

Cited by 90 publications

References 28 publications

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Microstructure formation and precipitation in laser welding of microalloyed C–Mn steel

Microstructure of fibre laser welded joint of dual phase steel with bake hardening steel

Dissimilar Metal Active Gas Welding of TWIP and DP Steel Sheets

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