Microstructure, forming limit diagram, and strain distribution of pre-strained DP-IF steel tailor–welded blank for auto body application

Basak, Shamik; Katiyar, Bhupesh Singh; Orozco-González, P.; Hernández, Víctor Hugo Baltazar; Arora, Kanwer Singh; Panda, Sushanta Kumar

doi:10.1007/s00170-019-03938-1

“…The reason for the existence of bainite in low-carbon steels is the high cooling rate of the fusion zone in laser welding compared to other welding methods. 13,30 The Vickers microhardness profile across the weld of the TWB is shown in Figure 3. As can be seen, the average hardness of the weld zone is more than twice compared to the base metal, which is due to the presence of a bainitic microstructure.…”

Section: Microstructure and Microhardnessmentioning

confidence: 99%

“…The concentration of plastic deformation in the thinner or weaker part of TWB in tensile tests and the reduction of TE also have been observed in previous research. 11,13 For a more detailed study of deformation, the TE is divided into UE and PUE. Figure 7(b) reveals that the UE of two sheets and TWB decreased by rising strain rate.…”

Section: Tensile Behaviormentioning

confidence: 99%

“…In TWB consisting of interstitial-free (IF) and dual-phase (DP) steel sheets of the same thickness, the forming limit of TWB has been reduced compared to the base metals and changed from biaxial stretching to near plane strain conditions. 13 The effect of fiber laser parameters, such as the influence of different laser welding speeds at constant power 14 and various laser powers at a fixed speed, 15 on mechanical properties and microstructure have been studied, and suitable parameters of fiber laser have been obtained. By using the digital image correlation (DIC) technique, the mechanical properties of the weld line of TWB have been identified.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of strain rate on tensile behavior of tailor welded blanks

Amini,

Nia

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

0

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The demand for weight reduction, cost savings, more fuel efficiency, and reduced greenhouse gas has led to the increasing application of tailor welded blanks (TWBs) in the automotive industry. The purpose of this study is to investigate the strain rate effect on the tensile behavior of TWB consisting of dissimilar thickness sheets. Hence, a fiber laser was used for welding St14 steel sheets. The weld zone was examined using metallographic and microhardness tests. For investigating the tensile properties, uniaxial tensile tests were performed at strain rates ranging from 0.001 to 10 s−1. It has been found that the presence of Bainitic microstructure in the weld zone increases its hardness. Tensile test results indicate that yield strength and ultimate tensile strength of base metals and TWB enhanced with increasing strain rate. The yield and ultimate tensile strength of TWB are higher than base metals at different strain rates. As the strain rate increases, the total elongation of the TWB decreases, but in base metals, it decreases first and then increases at higher strain rates. In TWB and base metals, by increasing strain rate, uniform elongation decreases, but post-uniform elongation increases. For analysis of plastic deformation of thick and thin parts of TWB, indexes of limiting thickness ratio and difference of ratios (DR) were used. DR decreases with increasing strain rate, which indicates a decrease in the plastic deformation of the thick part of TWB and is consistent with the experimental findings.

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“…Studies of the TWBs have been a hot topic in recent years [10]. Overall, the existing reports on TWBs mainly concentrated on themicrostructure, mechanical properties, formability, forming limit diagram, failure, residual stresses, forming and applications of these materials [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Control of defects in the deep drawing of tailor-welded blanks for complex-shape automotive panel

Wang

¹

,

Liu

²

,

Wang

³

et al. 2022

Int J Adv Manuf Technol

5

0

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With the development of lightweight vehicles, tailor welded blanks (TWBs) are increasingly used in the automotive industry. Splitting and wrinkling are the main defects during the deep drawing of TWBs. A new method to control the forming defects was introduced in the forming process of TWBs in this study. The microstructure and mechanical properties of TWBs were characterized through metallography and tensile tests. Finite element modelling of an automobile rear door inner panel made of TWBs was built to analyse deep drawing. Edge cutting and notch cut were introduced in the drawing to deal with forming defects and reduce the number of stamping tools. The minimum distance between the material draw-in and trimming lines, thinning index and thickening index were defined as the measurable index to analyse the numerical results. Orthogonal experiment, numerical simulation and multiobjective experiment were utilised to optimize the forming parameters. The proposed method and optimised parameters were verified through experiments. The experimental results are basically consistent with the numerical simulation. Results demonstrate that the proposed method can provide some guidance for controlling the defects in deep drawing of TWBs for complex shape automotive panel.

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“…Compared with the conventional stamping process, the stamping forming of TWBs can effectively reduce the number of tools, welding work and assembly costs [9]. Studies of the TWBs have been a hot topic in recent years [10]. Overall, the existing reports on TWBs mainly concentrated on themicrostructure, mechanical properties, formability, forming limit diagram, failure, residual stresses, forming and applications of these materials [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Control of Defects in Deep Drawing of Tailor-welded Blanks for Complex Shape Automotive Panel

Wang¹,

Liu²,

Zhou³

2021

Preprint

View full text Add to dashboard Cite

With the development of lightweight vehicles, tailor welded blanks (TWBs) are increasingly used in the automotive industry. Splitting and wrinkling are the main defects during the deep drawing of TWBs. A new method to control the forming defects was introduced in the forming process of TWBs in this study. The microstructure and mechanical properties of TWBs were characterized through metallography and tensile tests. Finite element modelling of an automobile rear door inner panel made of TWBs was built to analyse deep drawing. Edge cutting and notch cut were introduced in the drawing to deal with forming defects and reduce the number of stamping tools. The minimum distance between the material draw-in and trimming lines, thinning index and thickening index were defined as the measurable index to analyse the numerical results. Orthogonal experiment, numerical simulation and multiobjective experiment were utilised to optimize the forming parameters. The proposed method and optimised parameters were verified through experiments. The experimental results are basically consistent with the numerical simulation. Results demonstrate that the proposed method can provide some guidance for controlling the defects in deep drawing of TWBs for complex shape automotive panel.

show abstract

Microstructure, forming limit diagram, and strain distribution of pre-strained DP-IF steel tailor–welded blank for auto body application

Cited by 20 publications

References 47 publications

Effect of strain rate on tensile behavior of tailor welded blanks

Effect of strain rate on tensile behavior of tailor welded blanks

Control of defects in the deep drawing of tailor-welded blanks for complex-shape automotive panel

Control of Defects in Deep Drawing of Tailor-welded Blanks for Complex Shape Automotive Panel

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