Effect of coating on fiber laser welded joints of DP980 steels

Cui, Qingling; Parkes, D.; Westerbaan, D.; Nayak, S.S.; Zhou, Yunhong; Liu, D.; Goodwin, Frank; Bhole, S.D.; Chen, D.L.

doi:10.1016/j.matdes.2015.10.098

Cited by 18 publications

(14 citation statements)

References 15 publications

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“…The microstructure of DP steel can consist of up to 70 % martensite in the fine-grained ferrite matrix and up to 10 % of retained austenite. The tensile strength up to 1200 MPa and unit elongation up to 20 % can be achieved at a proper volume ratio of ferrite and martensite phases [11][12][13][14]. The complex microstructure of CP steels consists of a ferritic matrix with martensite and bainite, and it is the consequence of high strength, improved impact toughness with sufficient formability of CP steel sheets [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Low heat input is an important characteristic of laser welding, and it is the consequence of small fusion zone (FZ) and heat affected zone (HAZ) and the lower cost and higher flexibility compared to other welding methods. Low heat input welding methods can produce the fine-grained microstructures that provide the strength and toughness of the joint, and they also have the benefit of decreasing welding thermal distortion [11,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

Švec¹,

Schrek²,

Dománková³

2018

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Microstructures in the sub-zones of butt joint consisting of dual phase DP980 steel and complex phase CP780 steel with a thickness of 1.5 mm welded using fibre laser process were evaluated. The microstructure in the fusion zone was built of an approximately equal portion of martensite and lower bainite. In both coarse-grained heat affected zones near DP980 and CP780 steel dominant presence of lath martensite and a minor portion of lower bainite were observed. Similar microstructures were created in both fine-grained heat affected zone near DP980 and near CP780 steel but with the presence of ferrite and tempered martensite in region heated to lower peak temperatures. Mainly M3C carbides precipitated in lower bainite, and mostly MX carbonitrides precipitated in martensite. Created microstructures corresponded with microhardness profile across the joint. The highest microhardness of 476 HV0.1 was measured in the coarse-grained region of the heat affected zone near DP980 steel with a high portion of martensite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

Švec¹,

Schrek²,

Dománková³

2018

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“…Some of the major advantages of the DP steels include their superior mechanical properties in comparison with standard steels, moderate price thanks to the small amount of alloying additions, as well as excellent technological properties, together with good weldability and formability [1][2][3][4][5]. They can be used in the manufacture of lightweight automobiles to reduce fuel consumption without compromising other attributes such as safety, performance, recyclability, and cost.…”

Section: Introductionmentioning

confidence: 99%

“…In series production, the joining of TWBs is usually done by laser welding though other weld techniques are also possible. Among commercial laser systems, fibre lasers have the characteristics of excellent beam quality and high brightness, and consequently, they have attracted more attention over the last decade for cutting, welding, and cladding applications [1,20]. Low heat input is an important characteristic of laser welding, and it is the consequence of small fusion zone (FZ) and heat-affected zone (HAZ) and the lower cost and greater flexibility compared to other welding methods.…”

Section: Introductionmentioning

confidence: 99%

“…Low heat input is an important characteristic of laser welding, and it is the consequence of small fusion zone (FZ) and heat-affected zone (HAZ) and the lower cost and greater flexibility compared to other welding methods. Low heat input welding methods can produce the fine grain structures that provide the strength and toughness of the joint, and they also have the benefit of decreasing welding thermal distortion [1,21,22].…”

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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Effect of liquid column on process stability and weld formation under ultra-high power fiber laser-arc hybrid welding of thick plates

Song

et al. 2022

Int J Adv Manuf Technol

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Liquid column was a common problem in ultra-high power ber laser-arc hybrid welding (UHLAHW) process, which has an adverse effect on the welding stability and weld formation. Hence, the in uence of welding parameters on the behavior of liquid column were investigated systematically, including laser arc recombination process, laser power and welding speed. As a result, the violent rising liquid column under laser was suppressed markedly after arc addition. However, it was hardly to restrain liquid column upturn when laser power was extremely high, because the huge recoil pressure and shear force between metal vapor/plasma and molten pool could increase the upward momentum of melt. Besides, the height of liquid column and volume of spatters were directly in uenced by welding speed, due to the welding line energy could signi cantly in uence the ow of melt on the front of keyhole. By optimizing the welding process, the liquid column could be controlled and thus improved the stability. Finally, a sound weld bead with quali ed weld formation and 15.82 mm penetration was produced when the laser power was 21 kW and welding speed was 1.2 m/min under UHLAHW process. This work provides technical guidance for achieving stable welding process and quali ed weld formation for thick plates.

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Effect of coating on fiber laser welded joints of DP980 steels

Cited by 18 publications

References 15 publications

Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

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

Effect of liquid column on process stability and weld formation under ultra-high power fiber laser-arc hybrid welding of thick plates

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