Diffusion Reactivity between Zinc Plate Layer and Nanocrystalline Surface Layer of IF Steel by Near Surface-Severe Plastic Deformation

2005 ◽  
Vol 502 ◽  
pp. 117-122
Author(s):  
Yoritoshi Minamino ◽  
Nobuhiro Tsuji ◽  
Yuichiro Koizumi ◽  
Y. Nakamizo ◽  
M. Sato ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Early Stage ◽  
Ultrafine Grain ◽  
Interstitial Free ◽  
If Steel ◽  
Low Carbon ◽  
Phase Layer ◽  
Near Surface ◽  
Interstitial Free Steel ◽  
Phase Layers

The effect of near surface-ultrafine grain (NSUFG) layer with grain size of about 90nm on the solid reaction between Ti-added ultra-low carbon interstitial free steel sheet and electroplated zinc layer (ZP) was basically investigated at 473K and 573K, in comparison with the reactions of the coarse grains IF steel sheet (CG-IF) and the ZP. The NSUFG structure dramatically changes the reactions between ZP and IF steel, as follows; (1) the incubation times for the formation of reaction layers, pseudo-z-phase, are quite shorter for the NSUFG/ZP reactions than the CG/ZP ones, (2) in the early stage of annealing the former has the smooth interfaces of pseudo-z-phase layers but the latter has wavier ones like a stone wall, (3) the thickness of the pseudo-z-phase layer of the former is thicker than that of the latter, (4) some cracks are observed in NSUFG layers while no crack in coarse grain IF steel, and (5) the subsequent layer appears in the reaction between pseudo-z-phase and NSUFG layers former after long annealing by the blast-like break of the interface.

scholarly journals Texture Evolution During the Drawing of Low Carbon Steel

1994 ◽  
Vol 22 (4) ◽  
pp. 261-278 ◽  
Author(s):  
C. Schuman ◽  
C. Esling ◽  
M. J. Philippe ◽  
M. Hergesheimer ◽  
M. Jallon ◽  
...  
Keyword(s):  
Deformation Rate ◽  
Early Stage ◽  
Texture Evolution ◽  
Reduction Rate ◽  
Carbon Steels ◽  
Texture Gradient ◽  
Interstitial Free ◽  
Low Carbon ◽  
Fibre Texture ◽  
Drawing Direction

This study deals with the texture evolution during drawing of interstitial-free low carbon steels under different conditions to study the possible influence of the drawing direction, deformation rate and metal/die friction coefficient. The drawing has been carried out without intermediary annealing, with constant die angle and deformation rate per pass. In all cases, a 〈110〉 fibre texture has been observed at the early stage of deformation (a few percents). The drawing direction, whether alternate or unidirectional, has little effect on texture. Slight differences only in the intensity of peaks on pole figures (PFs) are noted. Alternate drawing leads to higher drawing limits. The grain size affects both the texture and the mechanical properties, which are improved by fine grains. For industrial drawing, i.e. at a high deformation rate, no texture gradient has been clearly observed. Nevertheless, slight differences have been noted in the PF intensities, with generally a slightly sharper texture in the core, compared to the surface. The microhardness tests show no hardness gradient. In slow drawing (low deformation rate), there is a weak texture gradient which disappears at larger deformation. In order to visualize the influence of the metal/die friction, we used a material covered with copper. Results show that at a given reduction rate, the material covered with copper shows peak intensities on the (110) PF which are half these of a material drawn under conventional conditions. The drawing textures of BCC materials always present a 〈110〉 fibre texture. A modeling of the texture evolution during drawing has also been carried out using the Taylor model.

On mechanism of fatigue fracture in interstitial free steel sheet

2010 ◽  
Vol 26 (4) ◽  
pp. 493-500 ◽  
Author(s):  
S. Majumdar ◽  
D. Bhattacharjee ◽  
K. K. Ray
Keyword(s):  
Fatigue Fracture ◽  
Steel Sheet ◽  
Interstitial Free ◽  
Interstitial Free Steel

Effect of Strain on Deformation Microstructure and Subsequent Annealing Behavior of IF Steel Heavily Deformed by ARB Process

2004 ◽  
Vol 467-470 ◽  
pp. 341-348 ◽  
Author(s):  
Nobuhiro Tsuji ◽  
Naoya Kamikawa ◽  
Yoritoshi Minamino
Keyword(s):  
Boundary Structure ◽  
Interstitial Free ◽  
If Steel ◽  
Low Carbon ◽  
Annealing Behavior ◽  
Crystallographic Feature ◽  
Continuous Recrystallization ◽  
The Mean ◽  
Lamellar Boundary ◽  
Very High

Ultra low-carbon interstitial free (IF) steel having ferrite (b.c.c.) single phase was deformed to various equivalent strains ranging from 0.8 to 5.6 by the accumulative roll bonding (ARB) process at 500°C. The microstructure and crystallographic feature of the deformed specimens were characterized mainly by FE-SEM/EBSD analysis. Grain subdivision during the plastic deformation up to very high strain was clarified quantitatively. After heavy deformation above 4.0 of strain, the specimens showed the lamellar boundary structure uniformly, in which the mean spacing of the lamellar boundaries was about 200nm and more than 80% of the boundaries were high-angle ones. Annealing behavior of the ARB processed IF steel strongly depended on the strain. The specimens deformed to medium strains exhibited discontinuous recrystallization characterized by nucleation and growth, while the specimens deformed above strain of 4.0 showed continuous recrystallization. The recrystallization behaviors are discussed on the basis of the microstructural and crystallographic parameters quantitatively measured in the as-deformed samples.

scholarly journals Accumulative Roll Bonding of Pure Copper and IF Steel

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Saeed Tamimi ◽  
Mostafa Ketabchi ◽  
Nader Parvin ◽  
Mehdi Sanjari ◽  
Augusto Lopes
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Accumulative Roll Bonding ◽  
Pure Copper ◽  
Rolling Process ◽  
Ultrafine Grain ◽  
Crystallographic Structure ◽  
Interstitial Free ◽  
If Steel ◽  
Roll Bonding

Severe plastic deformation is a new method to produce ultrafine grain materials with enhanced mechanical properties. The main objective of this work is to investigate whether accumulative roll bonding (ARB) is an effective grain refinement technique for two engineering materials of pure copper and interstitial free (IF) steel strips. Additionally, the influence of severely plastic deformation imposed by ARB on the mechanical properties of these materials with different crystallographic structure is taken into account. For this purpose, a number of ARB processes were performed at elevated temperature on the materials with 50% of plastic deformation in each rolling pass. Hardness of the samples was measured using microhardness tests. It was found that both the ultimate grain size achieved, and the degree of bonding depend on the number of rolling passes and the total plastic deformation. The rolling process was stopped in the 4th cycle for copper and the 10th cycle for IF steel, until cracking of the edges became pronounced. The effects of process temperature and wire-brushing as significant parameters in ARB process on the mechanical behaviour of the samples were evaluated.

Forming limit strains of interstitial free-IF steel sheet

2016 ◽  
Author(s):  
José Divo Bressan ◽  
Luciano Pessanha Moreira ◽  
Maria Carolina dos Santos Freitas
Keyword(s):  
Steel Sheet ◽  
Forming Limit ◽  
Interstitial Free ◽  
If Steel ◽  
If Steel Sheet
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