scholarly journals Improved formability prediction by modeling evolution of anisotropy of steel sheets

2019 ◽  
Vol 156-157 ◽  
pp. 263-280 ◽  
Author(s):  
Kaushik Bandyopadhyay ◽  
Shamik Basak ◽  
K. Sajun Prasad ◽  
Myoung-Gyu Lee ◽  
Sushanta Kr. Panda ◽  
...  
Keyword(s):  
Steel Sheets ◽  
Formability Prediction

Effect of yield criteria on the formability prediction of dual-phase steel sheets

2017 ◽  
Vol 133 ◽  
pp. 28-41 ◽  
Author(s):  
C. Cheng ◽  
M. Wan ◽  
X.D. Wu ◽  
Z.Y. Cai ◽  
R. Zhao ◽  
...  
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Yield Criteria ◽  
Steel Sheets ◽  
Formability Prediction

Forming-limit strains of perforated steel sheets under biaxial stress state

2019 ◽  
Vol 233 (11) ◽  
pp. 2401-2415
Author(s):  
Ryoichi Chiba ◽  
Ryo Nakamura ◽  
Yumika Suga
Keyword(s):  
Theoretical Calculations ◽  
Plastic Instability ◽  
Yield Function ◽  
Biaxial Stress ◽  
Instability Criterion ◽  
Forming Limit ◽  
Proportional Loading ◽  
Steel Sheets ◽  
Biaxial Stress State ◽  
Formability Prediction

The forming-limit strains of cold-rolled steel sheets perforated with regularly arranged round-, square-, and cross-shaped holes were experimentally and theoretically estimated. Two types of hole arrangements, i.e. square and triangular patterns, were considered for each hole shape and the experimental forming-limit strains were determined using the hemispherical dome test (also known as Nakazima test). The theoretical forming-limit curves were computed using the finite element method with Hill's quadratic yield function and a plastic instability criterion determined from the external force power. By comparing the experimental results and theoretical calculations under proportional loading, the formability prediction performance of the theoretical approach was evaluated. It was found that although the approach is not applicable for the triangular array of cross-shaped holes, it can achieve partially acceptable prediction for the other cases.

Direct observation of Fe-Al-Zn ternary intermetallic compound and its transformation during the early stage of hot-dip galvanizing

1993 ◽  
Vol 51 ◽  
pp. 1116-1117
Author(s):  
C. S. Lin ◽  
W. A. Chiou ◽  
M. Meshii
Keyword(s):  
Intermetallic Compound ◽  
Reaction Rate ◽  
Diffusion Rate ◽  
Early Stage ◽  
Zinc Bath ◽  
Steel Sheets ◽  
Direct Observations ◽  
Solid Iron ◽  
Iron And Zinc ◽  
Ternary Intermetallic Compound

The galvannealed steel sheets have received ever increased attention because of their excellent post-painting corrosion resistance and good weldability. However, its powdering and flaking tendency during press forming processes strongly impairs its performance. In order to optimize the properties of galvanneal coatings, it is critical to control the reaction rate between solid iron and molten zinc.In commercial galvannealing line, aluminum is added to zinc bath to retard the diffusion rate between iron and zinc by the formation of a thin layer of Al intermetallic compound on the surface of steel at initial hot-dip galvanizing. However, the form of this compound and its transformation are still speculated. In this paper, we report the direct observations of this compound and its transformation.The specimens were prepared in a hot-dip simulator in which the steel was galvanized in the zinc bath containing 0.14 wt% of Al at a temperature of 480 °C for 5 seconds and was quenched by liquid nitrogen.

2D analysis of magnetic field strength in GO SiFe steel sheets

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-579-Pr2-582 ◽  
Author(s):  
S. Tumanski ◽  
M. Stabrowski
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Steel Sheets
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