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Research Papers

Investigation on Shearing and Local Formability of Hot-Rolled High-Strength Plates

[+] Author and Article Information
Liang Dong

State Key Laboratory of Mechanical System
and Vibration,
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: dliang123@sjtu.edu.cn

Shuhui Li

State Key Laboratory of Mechanical System
and Vibration,
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: lishuhui@sjtu.edu.cn

Ji He

State Key Laboratory of Mechanical System
and Vibration,
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: benbenhj@sjtu.edu.cn

Ronggao Cui

State Key Laboratory of Mechanical System
and Vibration,
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: cuironggao@126.com

1Corresponding author.

Manuscript received September 14, 2015; final manuscript received May 13, 2016; published online June 20, 2016. Assoc. Editor: Edmund Chu.

J. Manuf. Sci. Eng 138(9), 091001 (Jun 20, 2016) (13 pages) Paper No: MANU-15-1477; doi: 10.1115/1.4033660 History: Received September 14, 2015; Revised May 13, 2016

In order to evaluate the shearing quality, the material inhomogeneity through thickness after shearing is introduced by the authors. This study investigates the shearing and local formability of hot-rolled high-strength steel (HSS) plate, which is generally exploited for the manufacturing of the beam of heavy trucks. Various kinds of plates with different thicknesses and strengths are used to figure out the effect of material properties on the shearing quality. Both the shear surface morphology and microhardness distribution of the sheared edge are considered for evaluating the influence of the sheared-edge quality on local formability during the following forming process. Vickers hardness tests are conducted to analyze the microhardness distribution on the shear surface, which is proved to have significant effect on the local formability of the sheared edge. Furthermore, two kinds of bending tests and simulation are employed to study the edge cracking phenomenon, and the results indicate that the junctional zone of burnished zone and fracture zone, which is defined as peak hardness zone (PHZ), has a significant impact on major strain distribution on shear surface in the side bending test and this region is the main cause of edge cracking in normal bending test.

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References

Figures

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Fig. 1

(a) Schematic diagram of the straight edge open shear tools, (b) diagram of the test specimen, and (c) photograph of the sheared specimen

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Fig. 2

The flexible shearing die used in this study

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Fig. 3

Shearing die used in this study: (a) upper punch and (b) lower die

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Fig. 4

Theoretical blanked profile HOR zone, HOB, height of fracture zone (HOF), and (β) fracture angle β

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Fig. 5

The investigation paths of the microhardness test

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Fig. 6

Two kinds of bending tests used in this study: (a) side bending test and (b) normal bending test

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Fig. 7

Microphotographs and SEM pictures of the sheared edge: (a) microphotograph of the burnished zone, (b) microphotograph of the fracture zone, (c) SEM picture of the burnished zone, and (d) SEM picture of the fracture zone

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Fig. 8

Surface topography of the sheared edge of BS700MCK2 with different thicknesses: (a) HOB, (b) HOR, and (c) fracture angle β

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Fig. 9

Surface topography of the sheared edge of BS700MCK2 and BS960QC with same thickness: (a) HOB, (b) HOR, and (c) fracture angle β

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Fig. 10

The sheared-edge hardness of BS700MCK2 with thickness of 6 mm

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Fig. 11

The results of microhardness distribution of the sheared edge for BS700MCK2 with different thicknesses: (a) t = 3 mm, (b) t = 6 mm, and (c) t = 8 mm

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Fig. 12

Result of strain distribution on the shear surface measured by DIC

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Fig. 13

(a) Section points position and (b) major strain of section points through thickness at the bending radius at the end of the bending moment

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Fig. 14

Testing equipment of normal bending tests

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Fig. 15

(a) The loading curve of the normal bending test, and pictures of different stages: (b) original state t = 0 s, (c) cracks initiation t = 40 s, (d) cracks propagation t = 60 s, and (e) final fracture t = 150 s

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Fig. 16

Limited punch stroke and max microhardness value of PHZ with different shear clearances for BS700 and BS960: (a) the limited punch stroke and (b) max microhardness value of PHZ

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Fig. 17

Geometry of the sheared sample in normal bending simulation

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Fig. 18

Flow curve for BS700

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Fig. 19

Microhardness and yield stress of five different kinds of hot-rolled HSS

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Fig. 20

(a) Mesh of transverse section and (b) the influence of mesh size on the simulation results

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Fig. 21

The experimental and simulated load versus punch stroke

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Fig. 22

Accumulated damage of PHZ as a function of the punch stroke

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