Beta Forging of Ti-6Al-4V: Microstructure Evolution and Mechanical Properties

2013 ◽  
Vol 554-557 ◽  
pp. 359-371 ◽  
Author(s):  
Antonello Astarita ◽  
Antonino Ducato ◽  
Livan Fratini ◽  
Valentino Paradiso ◽  
Fabio Scherillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Microstructure Evolution ◽  
Mechanical Response ◽  
Microstructural Analysis ◽  
Hot Forging ◽  
Numerical Data ◽  
Compression Tests ◽  
Reinforced Plastics ◽  
Forming Characteristics

Titanium alloys are finding an increasing use in the aeronautical field, due to their characteristics of high mechanical properties, lightness and corrosion resistance. Moreover these alloys are compatible with the carbon fibre reinforced plastics that are also finding a wide use in the aeronautical field. On the other hand the use of these alloys implies some drawbacks, for example titanium alloys are often considered more difficult to form and generally have less predictable forming characteristics than other metallic alloys such as steel and aluminum. In this paper was studied both the microstructure evolution and the mechanical properties of a Ti-6Al-4V rolled bar after hot forging. The thermo-mechanical response of a Ti-6Al-4V alloy was studied in elevated temperature compression tests (CT). Furthermore numerical simulations were carried out in order to do a comparison between numerical data and experimental results. The simulations were carried out using an implicit commercial code able to conduct coupled thermo-mechanical-microstructural analysis of hot forming processes of metal alloys.

Metallurgical Evolutions in Hot Forging of Dual Phase Titanium Alloys: Numerical Simulation and Experiments

2015 ◽  
Vol 651-653 ◽  
pp. 225-230 ◽  
Author(s):  
Antonino Ducato ◽  
Gianluca Buffa ◽  
Antonello Astarita ◽  
Antonino Squillace ◽  
Livan Fratini ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Titanium Alloys ◽  
Case Studies ◽  
Hot Forging ◽  
Fe Model ◽  
Dual Phase ◽  
Model Output ◽  
Forged Parts ◽  
Set Up

Titanium forging has been encountering a growing interest in the scientific and industrial communities because of the distinct advantages it provides with respect to machining, in terms of both mechanical properties of the product and material waste, thus significantly reducing the Buy to Fly ratio. In the paper, a numerical FE model, based on a tri-coupled approach and able to predict the microstructural evolutions of the workpiece during the process, is developed and set up. Calculated results are compared to experiments for a few industrial case studies. The final phases distribution in the forged parts is experimentally measured and compared to the FE model output finding satisfying overlapping.

scholarly journals Mechanical Properties of Concrete Slabs Reinforced with Recycled Steel Fibers from Post-Consumer Tires in Bogotá, Colombia

2020 ◽  
Vol 30 (2) ◽  
pp. 67-79
Author(s):  
Julián Carrillo ◽  
Carlos Díaz
Keyword(s):  
Mechanical Properties ◽  
Mechanical Response ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Concrete Slabs ◽  
Compression Tests ◽  
Steel Fiber Reinforced Concrete ◽  
Alternative Reinforcement ◽  
Recycled Fibers ◽  
Recycled Steel

Millions of post-consumer tires are not adequately disposed of each year, and thus, are producing an enormous environmental problem in the world. This environmental impact may be reduced when assessing this material as an alternative reinforcement for concrete. It is widely known that the toughness of steel fiber-reinforced concrete is suitably assessed by energy absorption tests on slabs. The purpose of this paper is to show and discuss the results of a research aimed at assessing the mechanical response of concrete slabs reinforced with recycled steel fibers from post-consumer tires in Bogotá, Colombia. The testing program of the study comprised 31 axial compression tests on cylinders, and 15 bending tests on concrete slabs reinforced with nominal dosages of 15, 30, and 60 kg/m3 of industrial steel fibers or recycled fibers obtained from post-consumer tires. Based on the measured response, preliminary design equations are proposed to estimate the mechanical properties of concrete reinforced with recycled steel fibers.

Experimental Study on the Mechanical Properties of Glass Fiber Reinforced Epoxy at Elevated Temperature

2019 ◽  
Vol 16 (3) ◽  
pp. 7108-7120
Author(s):  
Z. P. Chow ◽  
Z. Ahmad ◽  
K. J. Wong
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Elevated Temperature ◽  
Mechanical Response ◽  
Compression Tests ◽  
Compressive Properties ◽  
Fibre Direction ◽  
Glass Fiber Reinforced ◽  
Glass Fibre Reinforced ◽  
Increasing Temperature

This paper presents the effects of elevated temperature on the mechanical response of a glass fibre reinforced epoxy (GFRE) composite. The mechanical properties taken into account are tensile, compression and shear. All tests are carried out at temperatures of 30°C, 70°C and 110°C, below the glass transition temperature of the resin. The properties along fibre direction and perpendicular to fibre direction are investigated, with two sets consisting of 0° and 90° fibre direction for tensile and compression tests. Stress-strain profiles at each temperature are firstly compared. Subsequently, the elastic modulus and the ultimate strength with respect to temperature are assessed. The results indicate that tensile properties remain relatively unaffected at 70°C but drop rapidly at 110°C. In addition, compressive properties decrease steadily from 30°C to 110°C, while shear properties are heavily degraded with increasing temperature. Fibre dominated properties have better heat resistance compared to matrix dominated properties due to matrix softening and weakening. 

Mechanical Behavior and Microstructure Evolution of Mg-Gd-Y-Zn-Zr Alloy during Multipass Hot Compression Deformation

2016 ◽  
Vol 849 ◽  
pp. 186-195 ◽  
Author(s):  
Jian Min Yu ◽  
Xu Bin Li ◽  
Zhi Min Zhang ◽  
Qiang Wang ◽  
Yao Jin Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Cast Alloy ◽  
Hardness Test ◽  
Hot Compression ◽  
Compression Tests ◽  
Softening Effect ◽  
Hot Compression Deformation ◽  
Compression Deformation ◽  
Multipass Deformation

The multi-pass hot compression deformation behavior of the cast alloy with the composition of Mg-13Gd-4Y-2Zn-0.6Zr, was investigated, and the four-pass compression tests were conducted at the temperatures ranging from 350°C to 500°C and strain rate 0.01 s-1. The experimental results showed that the alloys incurred different degrees of softening by multipass deformation. The microstructure evolution for the deformed alloy was investigated, the influence of the microstructure on the hardness properties of the alloy discussed. The tests reveal that dynamic recrystallization is not the main softening mechanism for this alloy; rather, kink deformation refines the grains to achieve the observed softening effect. The hardness test curve showed that the hardness increased gradually with an increasing number of deformation passes. The improvement of the main mechanical properties related to the strengthening by the grain refinement. In multipass deformation, the misorientation of the kink belt gradually increased,and refined the grains. On the other hand, the grain size of the eutectic phase at the grain boundary decreased with increase of deformation passes. In addition, the mechanical properties were improved by the distribution dispersion of tiny cuboidal particles and acicular-like phases in the matrix.

scholarly journals Microstructural Analysis and Mechanical Properties of TiMo20Zr7Ta15Six Alloys as Biomaterials

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4808
Author(s):  
Adriana Savin ◽  
Mihail Liviu Craus ◽  
Alina Bruma ◽  
František Novy ◽  
Sylvie Malo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructural Analysis ◽  
Young Modulus ◽  
Tensile Creep ◽  
Crystallographic Structure ◽  
Medical Applications ◽  
Compression Tests ◽  
X Ray ◽  
High Entropy ◽  
Resonant Ultrasound

TiMoZrTaSi alloys appertain to a new generation of metallic biomaterials, labeled high-entropy alloys, that assure both biocompatibility as well as improved mechanical properties required by further medical applications. This paper presents the use of nondestructive evaluation techniques for new type of alloys, TiMo20Zr7Ta15Six, with x = 0; 0.5; 0.75; 1.0, which were obtained by vacuum melting. In Ti alloys, the addition of Mo improves tensile creep strength, Si improves both the creep and oxidation properties, Zr leads to an α crystalline structure, which increases the mechanical strength and assures a good electrochemical behavior, and Ta is a β stabilizer sustaining the formation of solid β-phases and contributes to tensile strength improvement and Young modulus decreasing. The effects of Si content on the mechanical properties of the studied alloys and the effect of the addition of Ta and Zr under the presence of Si on the evolution of crystallographic structure was studied. The influence of composition on fracture behavior and strength was evaluated using X-ray diffraction, resonant ultrasound spectroscopy (RUS) analyses, SEM with energy dispersive X-ray spectroscopy, and acoustic emission (AE) within compression tests. The β-type TiMo20Zr7Ta15Six alloys had a good compression strength of over 800 MPa, lower Young modulus (69.11–89.03 GPa) and shear modulus (24.70–31.87 GPa), all offering advantages for use in medical applications.

Mechanical Properties of Natural Bamboo due to Tensile and Compression Loadings

2018 ◽  
Vol 775 ◽  
pp. 576-581
Author(s):  
Bambang K. Hadi ◽  
Agus Subadra ◽  
Andi Kuswoyo
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mild Steel ◽  
Polyester Resin ◽  
Weibull Analysis ◽  
Compression Tests ◽  
Reinforced Plastics ◽  
Specific Modulus ◽  
Engineering Materials ◽  
Two Parameter

This paper deals with mechanical properties of natural bamboo (Gigantochloa pseudoarundinacea and Gigantochloa apus). Tensile and compression tests were done on these bamboo. It shows that Gigantochloa pseudoarundinacea is better in the field of strength and modulus compared with Gigantochloa apus. Further analysis shows that the specific modulus and strength of these bamboo are better compared the data available in the literature, and even better compared with traditional engineering materials, such as mild steel, polyester resin or Glass Reinforced Plastics. Two parameter Weibull analysis were used to analysis the experimental data.

Microstructure Evolution and Change in Mechanical Properties of Medium Mn Steels during Thermomechanical Processing

2018 ◽  
Vol 941 ◽  
pp. 346-351
Author(s):  
Fei Fei Hou ◽  
Atsushi Ito ◽  
Yu Bai ◽  
Akinobu Shibata ◽  
Nobuhiro Tsuji
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
Phase Region ◽  
Hot Compression ◽  
Manganese Steel ◽  
Compression Tests ◽  
Static Conditions ◽  
Manganese Steels

Medium manganese steels are nowadays energetically investigated as the third generation advanced high strength steels (AHSS) because of their excellent balance between material cost and mechanical properties. However, the phase transformation and microstructure evolution in medium manganese steels during various heat treatments and thermomechanical processing are still unclear. The present study firstly examined kinetics of static phase transformation behavior and microstructural change in a 3Mn-0.1C medium manganese steel. Hot compression tests were also carried out to investigate the influences of high-temperature thermomechanical processing on the microstructure evolution. It was found that ferrite transformation was quite slow in static conditions but greatly accelerated by hot compression in (austenite and ferrite) two phase region. Dual phase microstructures composed of martensite and ferrite with ferrite grain sizes of 1~2 μm were obtained, which exhibited superior mechanical properties.

scholarly journals Experimental Study on Mechanical Properties of Briquette Coal Samples with Different Moisture Content

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wang Haidong ◽  
Tao Yang ◽  
Wang Deyue ◽  
Sun Xin ◽  
Gao Jiahui
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Coal Seam ◽  
Mechanical Response ◽  
Triaxial Compression ◽  
Strain Curve ◽  
Confining Pressure ◽  
Coal And Gas Outburst ◽  
Compression Tests ◽  
Gas Outburst

Coal seam water injection is an important technical method to prevent and control coal and gas outburst and other disasters. Water can soften coal and change its mechanical properties. In order to study the mechanical properties of coal samples with different moisture content, briquette coal samples with five moistures content (4%, 6%, 8%, 10%, and 12%) were selected to carry out triaxial compression tests under different confining pressures (0.1, 0.2, 0.4, 0.8, and 1.2 MPa). Then, the mechanical response mechanism of the water-bearing briquette coal was analyzed. The results show that the slope of the linear elastic stage of the stress-strain curve gradually decreases with the increase of moisture content. Water-bearing coal exhibits strain strengthening characteristics under high confining pressure, which transforms the water-bearing coal from brittle to ductile state. The peak stress under different moisture content conditions shows a linear relationship with the confining pressure. The internal friction angle decreases linearly with the increase of moisture content. The cohesion varies parabolically with the increase of moisture content and reaches the maximum value when the moisture content is 8%. The coal body with moisture content between 7% and 9% has a high bonding force, which is beneficial to the consolidation of the coal body. Therefore, ensuring a reasonable moisture content of coal through coal seam injection can provide a basis for preventing coal and gas outburst.

Investigation of the Formability of Flanged Parts of Magnesium Alloy under Hot Forging Process

2009 ◽  
Vol 83-86 ◽  
pp. 67-76
Author(s):  
Huey Lin Ho ◽  
Su Hai Hsiang ◽  
Zun Yao Huang
Keyword(s):  
Magnesium Alloys ◽  
High Speed ◽  
Heating Temperature ◽  
Hot Forging ◽  
Test Machine ◽  
Compression Tests ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Forged Parts ◽  
Forming Characteristics

This study investigated the mechanical properties and forming characteristics of flanged parts made of AZ61 magnesium alloys via hot working. The bearing cover of the gearbox in cars was selected as a carrier in hot forging to probe into the formability of magnesium alloys. A high-speed metal test machine was used for compression tests under different forming temperatures and strain rates to obtain stress-strain curves. The stress-strain data are applied to the Finite Element Method to analyze the formability of the bearing cover. Finally, based on the comparison of simulation and experimental results, we conclude that under the same billet heating temperature and low strain rate, the forming load was small and no cracks developed on the flanges of forged parts. However, under the same condition, the microstructure of the part was coarse. This study also attempted to identify a method for manufacturing a bearing cover with a low forging load, and determined how temperature influences hardness and microstructure of the bearing cover.

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