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.

Numerical Simulation of Process Parameters in Flexible Discrete Clamp Stretch Forming

2012 ◽  
Vol 161 ◽  
pp. 53-57 ◽  
Author(s):  
He Li Peng ◽  
Ming Zhe Li ◽  
Peng Xiao Feng
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Numerical Simulations ◽  
Process Parameters ◽  
Numerical Results ◽  
Fe Model ◽  
Stretch Forming ◽  
Set Up

Flexible DCSF technology was put forward, and its forming character was described. The flexible DCSF machine was developed and related stretching experiment were carried out. The experimental photos show the DCSF technology is feasible and the DCSF machine is practicable. The FE model of flexible DCSF was set up, and extensive numerical simulations for spherical parts, saddle parts and S-type parts were carried out by Abaqus. The numerical results show that the longer the transitional length is, the more homogeneous the stretching strain and the thickness become. The smaller the friction coefficient is, the more homogeneous the stretching strain and the thickness become. The larger the clamp number is, the better the fit degree becomes. This work may provide useful guidance on the flexible DCSF process.

scholarly journals Numerical Analysis of Friction Conditions on Temperature and Phases Within Forged Ti-6Al-4V Aeroengine Drum

2021 ◽  
Author(s):  
Shiyuan Luo ◽  
Yongxin Jiang ◽  
Po Zhang ◽  
Fengping Yu ◽  
Siwen Liu
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Numerical Analysis ◽  
Fe Model ◽  
Cooling Rates ◽  
Β Phase ◽  
Heating Effects ◽  
Forged Parts ◽  
Microstructures And Mechanical Properties

Abstract Friction conditions significantly impact the temperature and phases of titanium forged parts, further directly affecting the microstructures and mechanical properties of final parts. In this paper, a 2D simplified FE model combined with phase transition equations is developed to simulate Ti-6Al-4V drum forging procedure. Then, friction effects on the temperature and phases of the forged drum are numerically analyzed and verified by experiments. Results indicate that unlike little influence on α+β phase, improving friction obviously decreases the general levels of temperature and β phase and increases the homogeneities of α and β phases within the forged drum, which are associated with cooling rates and the heating effects of friction and deformation.

Numerical Simulation of Laser Forming of Aluminum Sponges: Effect of Temperature and Heat Treatments

2014 ◽  
Vol 611-612 ◽  
pp. 731-738 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Denise Bellisario ◽  
Daniele Ferrari ◽  
Loredana Santo ◽  
Anna Santarsiero
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Experimental Tests ◽  
Point Of View ◽  
Material Behavior ◽  
Effect Of Temperature ◽  
Laser Forming ◽  
Laser Exposure ◽  
Fe Model ◽  
Aluminum Foams

Laser forming ofopen-cell aluminum foams can be modeled by means of 3D thermo-mechanical models but the correct evaluation of the alloy material properties is a key-factor for obtaining good predictions. In order to increase the model predictability from a quantitative point of view, further information about the material behavior under laser exposure is necessary. In this study the effect of the temperature on the mechanical properties of a commercial aluminum sponge has been evaluated in terms of yielding stress and tangent modulus. Experimental tests have been performed by compression and used to infer mechanical properties by means of a 3D FE model. The same approach has been used also to evaluate the effect of a heat treatment of the sponge on the material behavior during forming. In conclusion numerical simulation of laser heating has been used to show the effect of the laser-material interaction on the final homogeneity of processed foams.

MICROSTRUCTURAL MODELING OF COLD CREEP/FATIGUE IN NEAR ALPHA TITANIUM ALLOYS USING CELLULAR AUTOMATA METHOD

2008 ◽  
Vol 32 (2) ◽  
pp. 195-212 ◽  
Author(s):  
N. Boutana ◽  
P. Bocher ◽  
M. Jahazi ◽  
D. Piot ◽  
F. Montheillet
Keyword(s):  
Mechanical Properties ◽  
Cellular Automata ◽  
Titanium Alloys ◽  
Experimental Studies ◽  
Processing Parameters ◽  
Creep Tests ◽  
Creep Fatigue ◽  
Alpha Titanium ◽  
Set Up ◽  
Empirical Approaches

It is well known that the presence of large heterogeneous textured regions in forged near alpha titanium alloys could lead to large variations of mechanical properties when fatigue and creep cycles are applied at room temperature. On the other hand, experimental studies and microtexture investigations are complex to set up, lengthy and costly, and one cannot expect to understand the alloy behavior by relying only on empirical approaches. Hence, numerical methods are excellent alternatives for analyzing the influence of microscopic and macroscopic heterogeneities on mechanical properties in shorter times and with minimum need for experimentation. In the present investigation, a cellular automata (CA) method was used to simulate the effect of texture heterogeneities, on both local and global mechanical properties. A 2D array of cells was used and the stresses and strains developed in various heterogeneous regions were evaluated using the Eshelby theory. Using the CA method, various types of microstructures were modeled and compared with each other to quantify the influence of processing parameters on mechanical properties. The results predict, and are used to explain, the experimentally phenomena observed in creep responses during cold fatigue/creep tests of near alpha titanium samples.

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.

scholarly journals Effect of Hot Forging and Boron Content on the Mechanical Properties of Dual Phase Steel

2013 ◽  
Vol 15 (AEROSPACE SCIENCES) ◽  
pp. 1-14 ◽  
Author(s):  
A. Farahat ◽  
S. Ayyad ◽  
A. El-Desouky ◽  
W. Farouk ◽  
A. Kassab
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Boron Content ◽  
Hot Forging ◽  
Dual Phase

Phase evolution in hot forging of dual phase titanium alloys: Experiments and numerical analysis

2015 ◽  
Vol 20 ◽  
pp. 382-388 ◽  
Author(s):  
Stefania Bruschi ◽  
Gianluca Buffa ◽  
Antonino Ducato ◽  
Livan Fratini ◽  
Andrea Ghiotti
Keyword(s):  
Numerical Analysis ◽  
Titanium Alloys ◽  
Hot Forging ◽  
Phase Evolution ◽  
Dual Phase

scholarly journals Effects of Bedding Geometry and Cementation Strength on Shale Tensile Strength Based on Discrete Element Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jiong Wang ◽  
Yang Wang ◽  
Liu Yang ◽  
Tianquan Chang ◽  
Qingping Jiang
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Tensile Strength ◽  
Softening Effect ◽  
Strength Based ◽  
Increasing Trend ◽  
Simulation Results ◽  
Set Up ◽  
Brazilian Splitting ◽  
Line Crack

To study the effects of anisotropy and heterogeneity on the shale failure mode and tensile strength, Brazilian splitting tests were performed from both directions of the bedding and layer thickness. Layers containing different bedding and loading angles and layer thicknesses were obtained separately. The results show that, at 0° and 90° angles, the shale cracks grow “linearly”; at 15°, the shale cracks have “arc type” growth; and at 30°–75°, the shale-splitting displays “broken line” crack propagation. The tensile strength from 0° to 90° exhibits an increasing trend. Water has a significant softening effect on the tensile strength of shale—the higher the water content, the lower the tensile strength. In addition, a 3DEC numerical simulation was used to simulate the tests, establishing shale specimen particles with random blocks. In the shale disc, uneven parallel bedding and uniform parallel bedding were set up with different loading angles and layer thicknesses to generate simulated stress-displacement curves, and the effect of layering on shale cleavage was analyzed from a mesoscopic perspective. The tensile strength of shale with uniform parallel bedding was found to be higher under the same conditions, which is consistent with the experimental results. By comparing the experimental and simulation results, from both the macro- and mesoperspectives, the Brazilian splitting crack growth of shale is affected by bedding, displaying a process from disorder to order. This study is of great significance for further exploration of the mechanical properties of shale under loading failure.

Numerical Simulation of Discrete Die Bending of Rectangular Tube

2012 ◽  
Vol 602-604 ◽  
pp. 1951-1954 ◽  
Author(s):  
Qing Li Wei ◽  
Xin Zhong ◽  
Qiu Ping Song
Keyword(s):  
Numerical Simulation ◽  
Yield Strength ◽  
Influence Factors ◽  
Fe Model ◽  
Rectangular Tube ◽  
Bending Radius ◽  
Set Up

The concept of discrete die bending of rectangular tube is proposed, and the FE model is set up. The phenomenon of section distortion of rectangular tube generated by discrete die bending is analyzed. The feasibility of discrete die used for bending of rectangular tube is proved by comparing the section distorted rate generated by both discrete die and integral die. A lots of numerical simulation of the influence factors of section distortion are analyzed, the results show that larger the bending radius is or the thicker the rectangular tube is or the larger the yield strength of rectangular tube is, the smaller the section distorted rate will be. Then the dimple generated by discrete die is described, and the influence factors are studied, the results shows that the smaller the bending radius is or the thinner the rectangular tube is or the smaller the yield strength of rectangular tube is, the stronger the dimples on the rectangular tube will be.

scholarly journals Numerical Analysis of Friction Effects on Temperature and Phases within Forged Ti-6Al-4V Alloy Aeroengine Drum

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1649
Author(s):  
Shiyuan Luo ◽  
Yongxin Jiang ◽  
Kai Yan ◽  
Guangming Zou ◽  
Po Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Finite Element ◽  
Temperature Distribution ◽  
Fe Model ◽  
Β Phase ◽  
Heating Effects ◽  
Small Influence ◽  
Forged Parts ◽  
Reasonable Range

Friction conditions significantly impact the temperature and phases of titanium forged parts, further directly affecting the microstructures and mechanical properties of final parts. In this paper, a 2D simplified finite element (FE) model combined with phase transition equations is developed to simulate a Ti-6Al-4V drum forging procedure. Then, friction effects on the temperature and phases of the forged drum are numerically analyzed and verified by experiments. The simulated results indicate that a reasonable range of friction factor is needed to obtain a relatively homogenous temperature distribution within the forged drum. Moreover, unlike its small influence on the α + β phase, improving friction obviously decreases the general levels of temperature and β phase and increases the homogeneities of α and β phases within the forged drum, which are associated with cooling rates and the heating effects of friction and deformation.

Sign in / Sign up

Export Citation Format

Share Document