scholarly journals Microstructure and Performance of a Three-Layered Al/7075–B4C/Al Composite Prepared by Semi Continuous Casting and Hot Rolling

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 600 ◽  
Author(s):  
Yubo Zhang ◽  
Yingshui Yu ◽  
Guangye Xu ◽  
Ying Fu ◽  
Tingju Li ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Hot Rolling ◽  
Outer Layer ◽  
Sessile Drop ◽  
Rolling Process ◽  
Layered Composite ◽  
Al Alloy ◽  
Alloy Matrix ◽  
B4c Particles ◽  
Wetting Process

A three-layered composite material, consisting of an Al outer layer and a 7075-10 wt % B4C inner layer, was fabricated by semi-continuous casting and following a hot rolling process. The composite exhibits a clear layered structure with a good interfacial bond between layers. In the sessile drop experiment, the Al alloy melt dropped on the 7075-B4C composite at 650 °C, with the contact angle decreasing from 105° to 25° in 50 s, indicating that the infiltration and spreading both played important roles in the wetting process. In the inner layer, the reinforced B4C particles were distributed uniformly in the 7075 alloy matrix, and enhanced the average hardness of the inner layer to 163.4 HV, compared to that of the outer layer at 32.8 HV. The composite plate of 20 mm obtained the compression strength of 152 MPa. The electron probe microanalysis (EPMA) line scanning result showed that no harmful reaction or element diffusion occurred between B4C and the surrounding 7075 matrix. The B4C particles remained mechanically bonded into the matrix, and significantly reduced the bullet speed during the projectile impact test.

Exploration of Solution Space to Study Thermo-Mechanical Behavior of AA5083 Al-Alloy During Hot Rolling Process

2017 ◽  
Author(s):  
Anand Balu Nellippallil ◽  
Rishabh Shukla ◽  
Surya Ardham ◽  
Chung-Hyun Goh ◽  
Janet K. Allen ◽  
...  
Keyword(s):  
Process Parameters ◽  
Hot Rolling ◽  
Design Method ◽  
Solution Space ◽  
Rolling Process ◽  
Al Alloy ◽  
Aa5083 Alloy ◽  
Simulation Based Design ◽  
Process Operation ◽  
Set Based Design

A method is proposed to explore the solution space of a metallurgical process with an aim to foster material innovation through simulation based design. The efficacy of the method is demonstrated in the context of hot rolling of the AA5083 alloy. The set-based design approach is employed to predict the process parameters of rolling operation for a given set of specified requirements. Critical process parameters such as strain rate, temperature, heat transfer coefficient and strip width are only considered in the design study. Ternary plots are constructed and utilized to explore the solution space obtained and thereby identifying feasible regions of process operation wherein the specified requirements are satisfied. Since plant data is not available for the study, Finite-element (FE) analysis is carried out as a means to validate the results obtained using aforesaid design method.

scholarly journals Mechanical and Thermal Neutron Absorbing Properties of B4C/Aluminum Alloy Composites Fabricated by Stir Casting and Hot Rolling Process

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 413
Author(s):  
Donghyun Lee ◽  
Junghwan Kim ◽  
Byeongjin Park ◽  
Ilguk Jo ◽  
Sang-Kwan Lee ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Hot Rolling ◽  
Microstructural Analysis ◽  
Rolling Process ◽  
Target Volume ◽  
Stir Casting ◽  
Al Alloy ◽  
Neutron Shielding ◽  
Interfacial Layers ◽  
Hot Rolling Process

In this study, to fabricate neutron shielding material, boron carbide (B4C)-reinforced aluminum (Al) alloy composites were successfully fabricated by stir casting followed by a hot rolling process. Microstructural analysis of B4C/Al6061 composites with different volume fractions (5, 10, 20, 25, and 30%) revealed that the composites had volume ratios similar to the target volume ratios of B4C. Furthermore, B4C reinforcements were uniformly dispersed in the Al matrix, forming multi-interfacial layers of Al4C3/(Ti,Cr)B2. The interfacial layer generated during stir casting maintained its own structure after the hot rolling process, indicating strong interfacial bonding strength. The tensile strengths of the B4C/Al6061 composites increased to 20 vol.% and stayed above the value for Al6061, even reaching 30 vol.%. The measured thermal neutron shielding rate increased with increasing B4C content, and the highest thermal neutron shielding rate was observed at 30 vol.% composite, which corresponds to 95.6% neutron shielding at 0.158-cm thickness.

Hot Rolling Process Simulation: Application to UIC-60 Rail Rolling

2010 ◽  
Vol 3 (1) ◽  
pp. 65-71
Author(s):  
Armindo Guerrero ◽  
Javier Belzunce ◽  
Covadonga Betegon ◽  
Julio Jorge ◽  
Francisco J. Vigil
Keyword(s):  
Hot Rolling ◽  
Process Simulation ◽  
Rolling Process ◽  
Hot Rolling Process

scholarly journals Shaping Microstructure and Mechanical Properties of High-Carbon Bainitic Steel in Hot-Rolling and Long-Term Low-Temperature Annealing

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 384
Author(s):  
Tomasz Dembiczak ◽  
Marcin Knapiński
Keyword(s):  
Mathematical Models ◽  
Hot Rolling ◽  
Constitutive Equations ◽  
Rolling Process ◽  
Bainitic Steel ◽  
Compression Tests ◽  
High Carbon ◽  
Bainite Steel ◽  
Dilatometric Studies

Based on the research results, coefficients in constitutive equations, describing the kinetics of dynamic, meta-dynamic, and static recrystallization in high-carbon bainitic steel during hot deformation were determined. The developed mathematical model takes into account the dependence of the changing kinetics in the structural size of the preliminary austenite grains, the value of strain, strain rate, temperature, and time. Physical simulations were carried out on rectangular specimens. Compression tests with a flat state of deformation were carried out using a Gleeble 3800. Based on dilatometric studies, coefficients were determined in constitutive equations, describing the grain growth of the austenite of high-carbon bainite steel under isothermal annealing conditions. The aim of the research was to verify the developed mathematical models in semi-industrial conditions during the hot-rolling process of high-carbon bainite steel. Analysis of the semi-industrial studies of the hot-rolling and long-term annealing process confirmed the correctness of the predicted mathematical models describing the microstructure evolution.

scholarly journals 3D-FEM Simulation of Hot Rolling Process and Characterization of the Resultant Microstructure of a Light-Weight Mn Steel

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 569
Author(s):  
Ana Claudia González-Castillo ◽  
José de Jesús Cruz-Rivera ◽  
Mitsuo Osvaldo Ramos-Azpeitia ◽  
Pedro Garnica-González ◽  
Carlos Gamaliel Garay-Reyes ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Thermomechanical Processing ◽  
Computational Simulation ◽  
Effective Strain ◽  
Fem Simulation ◽  
Rolling Process ◽  
3D Fem ◽  
Hot Rolling Process ◽  
Mn Steel

Computational simulation has become more important in the design of thermomechanical processing since it allows the optimization of associated parameters such as temperature, stresses, strains and phase transformations. This work presents the results of the three-dimensional Finite Element Method (FEM) simulation of the hot rolling process of a medium Mn steel using DEFORM-3D software. Temperature and effective strain distribution in the surface and center of the sheet were analyzed for different rolling passes; also the change in damage factor was evaluated. According to the hot rolling simulation results, experimental hot rolling parameters were established in order to obtain the desired microstructure avoiding the presence of ferrite precipitation during the process. The microstructural characterization of the hot rolled steel was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the phases present in the steel after hot rolling are austenite and α′-martensite. Additionally, to understand the mechanical behavior, tensile tests were performed and concluded that this new steel can be catalogued in the third automotive generation.

scholarly journals Effect of Boron Carbide Addition on Wear Resistance of Aluminum Matrix Composites Fabricated by Stir Casting and Hot Rolling Processes

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 989
Author(s):  
Donghyun Lee ◽  
Junghwan Kim ◽  
Sang-Kwan Lee ◽  
Yangdo Kim ◽  
Sang-Bok Lee ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Boron Carbide ◽  
Hot Rolling ◽  
Rolling Direction ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Wear Depth ◽  
Wear Properties ◽  
B4c Particles

In this study, to evaluate the effect of boron carbide (B4C) addition on the wear performance of aluminum (Al), Al6061 and 5, 10, and 20 vol.% B4C/Al6061 composites were manufactured using the stir casting and hot rolling processes. B4C particles were randomly dispersed during the stir casting process; then, B4C particles were arranged in the rolling direction using a hot rolling process to further improve the B4C dispersion and wear resistance of the composites. Furthermore, a continuous interfacial layer between B4C and the Al6061 matrix was generated by diffusion of titanium (Ti) and chromium (Cr) atoms contained in the Al6061 alloy. Wear depth and width of the composites decreased with increasing B4C content. Furthermore, with B4C addition, coefficient of friction (COF) improved as compared with that of Al6061. The results indicate that interface-controlled, well-aligned B4C particles in the friction direction can effectively increase the wear properties of Al alloys and improve their hardness.

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