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.

Evolution of Texture in ARB Processing of Al 99.8 %

2005 ◽  
Vol 495-497 ◽  
pp. 797-802
Author(s):  
Jan Kuśnierz ◽  
J. Bogucka
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Crystallographic Texture ◽  
Accumulative Roll Bonding ◽  
Orientation Distribution ◽  
Industrial Practice ◽  
Roll Bonding ◽  
Rolled Material

The accumulative roll-bonding (ARB) process, invented a few years ago, is a promising mode for introducing severe plastic deformation into industrial practice. The ARB process consists in rolling of the pack of two sheets up to 50 %. Then, the rolled material is sectioned into two halves, stacked and the procedure of roll-bonding is repeated. The orientation distribution of ARB processed Al 98 % up to e ~ 12 is analyzed in the paper. The evolution of crystallographic texture has been discussed in relation with changes of mechanical properties and structure.

THE EFFECTS OF ACCUMULATIVE ROLL BONDING PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF IF STEEL

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2866-2873 ◽  
Author(s):  
SAEED TAMIMI ◽  
MOSTAFA KETABCHI ◽  
NADER PARVIN
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Accumulative Roll Bonding ◽  
Low Carbon Steel ◽  
Rolling Process ◽  
Low Carbon ◽  
Roll Bonding ◽  
Rolling Pass ◽  
Steel Strips ◽  
Wire Brushing

This work aims to investigate whether accumulative roll bonding (ARB) is an effective grain refinement technique for ultra-low-carbon steel strips containing 0.004% C. For this purpose, a number of ARB processes were performed at 500 °C, with 50% reduction in area of each rolling pass. It was found that both the ultimate grain size achieved, as well as the degree of bonding, depend on number of rolling pass and reduction of area as a whole. The mean grain size was obtained using AFM was about 130nm. The mechanical properties after rolling and cooling were obtained. Also, the fracture surfaces were studied by Scanning Electron Microscopy (SEM). It was concluded that metal's tensile strengths increased by 334% while the ductility dropped from a prerolled value of 50.5% to 2.6%. Effect of wire brushing on samples observed too. It increased on the wire brushed sheet for 7 HV. The rolling process was stopped when cracking of the edges became pronounced.

Asymmetric accumulative roll bonding of aluminum/copper composite sheets

2020 ◽  
pp. 146442072098048
Author(s):  
Mehran Tamjidi Eskandar ◽  
Ali Parvizi ◽  
Davood Rahmatabadi ◽  
Ramin Hashemi
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Bond Strength ◽  
Accumulative Roll Bonding ◽  
Plastic Instability ◽  
Roll Bonding ◽  
Deformation Processes ◽  
Plastic Deformation Rate ◽  
Micro Dimples ◽  
Copper Composite

For the first time in this study, a comprehensive experimental investigation was performed to investigate the effect of different roller diameter ratios ( Rd) on mechanical properties and plastic instability of Al/Cu composite produced by the asymmetric accumulative roll bonding process. For this purpose, Al/Cu composites were produced using three different Rd in three passes. Then, bond strength, mechanical properties, microstructure, and fracture surface of all specimens were determined. The results showed that due to the mechanisms underlying the severe plastic deformation processes, all composites’ mechanical properties sharply increased compared to aluminum and copper. As the Rd increases, the bond strength and hardness of the Al/Cu interface increase due to improved plastic deformation rate, surface expansion, and more extrusion of the material at the boundary of two layers. Besides, the hardness along the thickness was found to be very heterogeneous due to the uneven distribution of strain and strain hardening. Scanning Electron Microscopy (SEM) micrographs depicted a decrease in the layers’ thickness, an increase in the plastic instability of the copper, and improved bonding strength of the layers as Rd rises. However, in all specimens, the layered structure was maintained. Fracture micrographs also revealed that the fracture mechanism is ductile for both aluminum and copper layers at different Rd. However, with increasing the Rd, the number and the depth of the dimples along with micro-pores decrease. Finally, the non-uniform strain distribution of the process caused the micro-dimples to be drawn in different directions.

scholarly journals Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1925
Author(s):  
Young Gun Ko ◽  
Kotiba Hamad
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Ultrafine Grain ◽  
Speed Ratio ◽  
Shear Direction ◽  
Interstitial Free ◽  
If Steel ◽  
Shear Texture ◽  
Differential Speed Rolling ◽  
Differential Speed

The aim of this paper was to investigate the microstructural development and properties of interstitial free (IF) steel fabricated using the DSR (differential speed rolling) process. Severe plastic deformation of the DSR passes was imposed on the sample for up to four passes, leading to ~1.7 total strain with a speed ratio of 1:4 between the two rolls. Microstructural observation revealed that the equiaxed grain size of ~0.7 µm, including the formation of grain boundaries with a high angle of misorientation, was reached after four operations of DSR, which was attributed to the grain subdivision of severely elongated ferrite grain. Since the deformation mode of the DSR operation was dominated by severe shear deformation, the main shear texture of the bcc components appeared in all DSR operations in which the α-fiber of the {110} slip became a main component in accommodating the severe plastic deformation of the DSR process. The intensity of the shear texture, the {110} and {112} slip, increased by increasing the number of passes. Moreover, the γ-fiber of the <112>-type planes was activated as a result of the alternation of the shear direction during sample rotation. The microhardness and room temperature tensile tests revealed that the strength of the IF steel improved as the amount of strain increased, and this was attributed to the grain refinement and texture characteristics of the samples after the DSR processing.

Susceptibility to Hydrogen Embrittlement of IF Steel with Ultrafine-Grained Structure Produced by Accumulative Roll-Bonding Process

2010 ◽  
Vol 654-656 ◽  
pp. 1235-1238 ◽  
Author(s):  
Takumi Haruna ◽  
Yuichi Nakagawa ◽  
Daisuke Terada ◽  
Naoki Takata ◽  
Nobuhiro Tsuji
Keyword(s):  
Hydrogen Embrittlement ◽  
Accumulative Roll Bonding ◽  
Fracture Strain ◽  
Cathodic Current Density ◽  
Interstitial Free ◽  
If Steel ◽  
Cathodic Current ◽  
Roll Bonding ◽  
Charging Time ◽  
Ultrafine Grained

We have investigated the susceptibility to hydrogen embrittlement of interstitial-free (IF) steel with ultrafine-grained microstructure produced by accumulative roll-bonding (ARB) process. The ARB process was conducted to as-received IF steel at 773 K, and repeated to five cycles. The as-received and the ARBed IF steels were cut into tensile specimens, and then hydrogen was electrochemically charged to the specimens in a sulfuric acid solution of pH 2.5 at a cathodic current density of 50 A m-2 for several charging times. Immediately after the hydrogen-charging process, tensile test was conducted at ambient temperature and an initial strain rate of 3.3 x 10-4 s-1. Besides, state and amount of hydrogen absorbed in the specimen were determined with a thermal desorption gas spectroscopy (TDS) at a heating rate of 5.6 x 10-2 K s-1. As a result, almost no hydrogen was absorbed in the as-received IF steel charged for a long time of ca. 300 ks, and a fracture strain of the steel was independent of the charging time. On the other hand, amount of hydrogen in the 5-cycle ARBed steel increased with an increase in the charging time, and the fracture strain decreased with an increase in the charging time, indicating that the ARBed steel exhibited susceptibility to hydrogen embrittlement.

Mechanical Properties and Aging Behavior of Ultrafine Grained Al-Ag Alloy Fabricated by Accumulative Roll-Bonding

2014 ◽  
Vol 794-796 ◽  
pp. 851-856
Author(s):  
Tadashiege Nagae ◽  
Nobuhiro Tsuji ◽  
Daisuke Terada
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Accumulative Roll Bonding ◽  
Precipitation Hardening ◽  
Tensile Elongation ◽  
Solution Treatment ◽  
High Strength ◽  
Subsequent Aging ◽  
Roll Bonding ◽  
Ultrafine Grained

Accumulative roll-bonding (ARB) process is one of the severe plastic deformation processes for fabricating ultrafine grained materials that exhibit high strength. In aluminum alloys, aging heat treatment has been an important process for hardening materials. In order to achieve good mechanical properties through the combination of grain refinement hardening and precipitation hardening, an Al-4.2wt%Ag binary alloy was used in the present study. After a solution treatment at 550°C for 1.5hr, the alloy was severely deformed by the ARB process at room temperature (RT) up to 6 cycles (equivalent strain of 4.8). The specimens ARB-processed by various cycles (various strains) were subsequently aged at 100, 150, 200, 250°C, and RT. The hardness of the solution treated (ST) specimen increased by aging. On the other hand, hardness of the ARB processed specimen decreased after aging at high temperatures such as 250°C. This was probably due to coarsening of precipitates or/and matrix grains. The specimen aged at lower temperature showed higher hardness. The maximum harnesses achieved by aging for the ST specimen, the specimens ARB processed by 2 cycles, 4 cycles and 6 cycles were 55HV, 71HV, 69HV and 65HV, respectively. By tensile tests it was shown that the strength increased by the ARB process though the elongation decreased significantly. However, it was found that the tensile elongation of the ARB processed specimens was improved by aging without sacrificing the strength. The results suggest that the Al-Ag alloy having large elongation as well as high strength can be realized by the combination of the ARB process for grain refinement and the subsequent aging for precipitation hardening.

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