Influence of cathodic polarity during electrocleaning process on the brown stain defect formation after skin pass on cold‐rolled close annealed steel

2020 ◽  
Vol 71 (9) ◽  
pp. 1500-1511
Author(s):  
Subho Chakraborty ◽  
Ashwin Pandit ◽  
Kuntal Sarkar ◽  
Nitu Rani
Keyword(s):  
Defect Formation ◽  
Skin Pass ◽  
Cold Rolled ◽  
Annealed Steel

Numerical Simulation and Analysis for Blow-Off Flow Field of a Wet Skin Pass Mill

2014 ◽  
Vol 597 ◽  
pp. 238-241
Author(s):  
Hai Jun Qiao ◽  
Dian Rong Gao
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flip Angle ◽  
Strip Surface ◽  
Skin Pass ◽  
Cold Rolled ◽  
Finite Element Numerical Simulation ◽  
Air Nozzle ◽  
Roll Gap ◽  
Pass Mill

Blow-off air nozzles blow away the residual emulsion from roll gap and strip surface. Algorithm SIMPLY were used for the finite element numerical simulation for a representational air nozzle blow-off flow field near the roll gap in a cold-rolled skin pass mill. The working conditions of the blow-off flow field was the combination of gas pressure of 0, 2, 5 and 10bar and flip angle of 0°, 5°, 10°, 15°, 20° and 25°. The study provides a reference for control and optimization for the removal process of residual emulsion and design, manufacture, model selection and optimization for the related air nozzles.

Defect formation at internal interfaces and grain boundaries of cold-rolled Fe and Ni during heavy ion irradiation

1998 ◽  
Vol 527 ◽  
Author(s):  
G. Aggarwal ◽  
P. Sen
Keyword(s):  
Structure Formation ◽  
Dissipative Structure ◽  
Defect Formation ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Electronic Energy ◽  
Resistivity Measurements ◽  
Heavy Ion Irradiation ◽  
Dynamic Events ◽  
Cold Rolled

ABSTRACTInstabilities arise out of dynamic events and can lead to nonequilibrium (self-organization) processes. Ion irradiation is by nature a nonequilibrium process and hence formation of structures, metastable or otherwise is to be expected. Recently, it has been theoretically predicted that metals under ion irradiation can lead to dissipative structure formation arising out of radiation damage and their subsequent annealing. The possibility of direct observation of such structures in metals, under irradiation, is however reduced due to nonavailability of a large concentration of defects (mainly point defects) at any point of time. In this experimental presentation we show that this can be overcome through the involvement of microstructural imperfections which rearrange during irradiation. Employing microstructurally impure specimens of Fe and Ni, it is shown that heavy ions dissipate their electronic energy to modify atomic arrangements at the microstructure. The increased concentration of defects (atomic rearrangements), amenable to statistical decay is shown to produce structures in the 4-probe resistivity measurements which we assign to dissipative structure formation.

scholarly journals Recrystallization and Mechanical Behavior of High Mn and Low C Cold Rolled and Annealed Steel with TWIP Effect

2012 ◽  
Vol 715-716 ◽  
pp. 579-584 ◽  
Author(s):  
Dagoberto Brandao Santos ◽  
Berenice Mendonça Gonzalez ◽  
Elena V. Pereloma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Driving Force ◽  
Vickers Microhardness ◽  
Tensile Tests ◽  
Total Elongation ◽  
Strain Hardening Exponent ◽  
Twip Steels ◽  
Cold Rolled ◽  
Annealed Steel

ncreasing demand for automotive vehicles with reduced weight, improved crashworthiness and passengers safety has steamed the research of new Twinning Induced Plasticity (TWIP) steels. In this work the effect of annealing between 400 and 900°C on the microstructure and mechanical properties of hot and cold rolled 0.06C-24Mn-3Al-2Si-1Ni (wt%) steel with TWIP effect was investigated. The results have shown that steel exhibits fast recrystallization kinetics with a low amount of recovery, which results in a high driving force for the former. Mechanical properties were determined using Vickers microhardness and tensile tests. Tensile strength of 670 MPa with 54% of total elongation, and strain hardening exponent of 0.57 were reached after annealing at 900°C.

Inter-Relationship among Skin Pass Reduction, 3D and 2D Roughness Parameters and the Stampability/Paintability of Cold Rolled Steel Sheets for the Automotive Industry: A Preliminary Analysis

2014 ◽  
Vol 783-786 ◽  
pp. 1039-1045 ◽  
Author(s):  
Eduardo Nunes ◽  
Antonio Fabiano de Oliveira ◽  
Thiago Sekeres ◽  
Christian Wichern ◽  
Ronald Lesley Plaut
Keyword(s):  
Automotive Industry ◽  
Spectral Curve ◽  
Research Work ◽  
Roughness Parameters ◽  
Steel Sheets ◽  
Skin Pass ◽  
Cold Rolled ◽  
Automotive Steel ◽  
2D And 3D ◽  
Published Research

The aim of this research work is to study the inter-relationship, under controlled industrial conditions, among skin pass reductions, surface topography (characterized by 2D and 3D) roughness parameters, stampability and painted surface finish quality for automotive steel sheet stampings.Different surface textures obtained from cold rolling finishing have been evaluated in terms of paintability tests (rating and spectral curve) and tentatively related to roughness parameters (2D and 3D) obtained from the cold finished sheets. Some relevant tendencies have been established amongst these parameters.The results presented here are in accordance with other recently published research showing that there is a clear relationship between these parameters, and that further detailed studies are needed.

scholarly journals Estimation of 4th and 6th Order ODF Coefficients From Elastic Properties in Cold Rolled Steel Sheets

1989 ◽  
Vol 11 (1) ◽  
pp. 41-56 ◽  
Author(s):  
Kei Sakata ◽  
Dominique Daniel ◽  
John J. Jonas
Keyword(s):  
Elastic Properties ◽  
Elastic Energy ◽  
Elastic Anisotropy ◽  
Polycrystalline Materials ◽  
Orthorhombic Symmetry ◽  
Rolled Steel ◽  
Steel Sheets ◽  
Different Types ◽  
Cold Rolled ◽  
Annealed Steel

Generally only the 4th order ODF coefficients are deduced from the observed elastic anisotropy of textured polycrystalline materials with cubic/orthorhombic symmetry. In this study, a method is described for the prediction of the 4th and 6th order ODF coefficients from the elastic properties of cold rolled and annealed steel sheets of 5 different types. In order to link these properties with the texture, the elastic energy method of Bunge (1974) is employed. By estimating the volume fractions of the principal preferred orientations and their gaussian spreads, ODF coefficients of the 4th (C411, C412 and C413) and 6th (C611, C612 and C614) orders can be successfully obtained. As a result, the planar r-value distribution can be predicted more accurately than when only the 4th order coefficients are employed.

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