Microstructures and failure analyses of DP980 laser welded blanks in formability context

Bandyopadhyay, Kaushik; Panda, Sushanta Kumar; Saha, Partha; Hernández, Víctor Hugo Baltazar; Zhou, Y.

doi:10.1016/j.msea.2015.11.091

Cited by 39 publications

(25 citation statements)

References 28 publications

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“…where D h is the average hole diameter after rupture and D o is the original hole diameter. Another test also extensively adopted to assess the formability of metallic sheets is the Erichsen cupping test [5][6][7][8]. The Erichsen Cupping Test (ECT) is aimed to produce stretching conditions on thin sheets by imposing a spherical or hemispherical punch against a clamped specimen placed between a die and a blank-holder.…”

Section: Introductionmentioning

confidence: 99%

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

et al. 2019

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The material characterization regarding sheet metal formability is usually assessed by the forming limit curve (FLC). The FLC requires specialized and expensive equipment, several samples with different geometries, and can be a very time-consuming procedure for data treatment. Alternatively, the hole expansion test (HET) and the Erichsen Cupping Test (ECT) can be used for routine evaluations of sheet metal mechanical behavior. These formability tests require fewer quantities of material and easy specimen preparation with a fast analysis of results. The HET and ECT procedures provide a proper evaluation of sheet material stretch-flangeability, formability, strength, and ductility. In this work, we developed a low-cost mechanical device capable of performing the HET and ECT tests using a universal testing machine. The equipment is designed to meet the test parameters set by ISO 16630 (HET) and ISO 20482 (ECT) standards. In order to verify its functionality, tests were carried out with the dual-phase steels DP600 and DP780. The corresponding values determined for the hole expansion ratio and the Erichsen index provided reliable results in terms of the accuracy and repeatability of the proposed testing device.

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Section: Introductionmentioning

confidence: 99%

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

et al. 2019

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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%

“…The most important advantage of a part made from TWBs is the weight reduction compared to conventional products. A car body manufactured using TWBs and high strength steels can achieve a 25 % weight reduction [3,18,19]. In series production, the joining of TWBs is usually done by laser welding though other weld techniques are also possible.…”

Section: Introductionmentioning

confidence: 99%

“…The proper microstructure assures proper ratio between strength and formability [3,4,23]. The microstructure is affected mainly by the chemical composition of base materials, sheets thicknesses and welding parameters such as power input, welding speed and others.…”

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%

See 2 more Smart Citations

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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Strain Rate-Dependent Hardening Behavior of Weld Metal in Laser Welded Blanks with GEN3 AHSS

Kim

2022

The Minerals, Metals &Amp; Materials Series

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Microstructures and failure analyses of DP980 laser welded blanks in formability context

Cited by 39 publications

References 28 publications

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

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

Strain Rate-Dependent Hardening Behavior of Weld Metal in Laser Welded Blanks with GEN3 AHSS

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