The Effect of Isothermal Forging Parameters on the Microstructure and Properties of Ti-5Al-5Mo-5V-1Cr-1Fe Titanium Alloy

2010 ◽  
Vol 97-101 ◽  
pp. 301-305
Author(s):  
Hong Zhen Guo ◽  
Xiao Yan Wang ◽  
Zhao Long Zhao ◽  
Tao Wang ◽  
Ze Kun Yao
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Process Parameters ◽  
Duplex Microstructure ◽  
Deformation Degree ◽  
Isothermal Forging ◽  
Forging Process ◽  
Temperature Range ◽  
Fine Duplex ◽  
Strength And Plasticity

In this paper the effect of isothermal forging process parameters on the microstructure and the mechanical properties of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy was researched. The results of the tests indicate that, in the temperature range of 755~905 °C and the deformation degree range of 20~60 %, with the increase of deforming temperature, the volume of primary α-phases decrease, but the globularization extent of the α-phases increases and partial secondary α-phases transform into equiaxed shape. At the temperature of 860 °C, the alloy exhibits excellent strength and plasticity, as the uniform and fine duplex microstructure formed after isothermal forging. When the deformation degree increased from 20% to 60%, primary and secondary α-phases were gradually broken and the recrystallization energy was continually accumulated, which ceaselessly strengthened the properties of the alloy. With the increase of forging times, the globularization extent of decreases, leaving the chain of α-phases, which damages the strength and plasticity of the alloy.

The Effect of Isothermal Forging Process Parameters on the Microstructure and the Properties of TA15 Near α Titanium Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 367-371
Author(s):  
Hong Zhen Guo ◽  
Zhang Long Zhao ◽  
Bin Wang ◽  
Ze Kun Yao ◽  
Ying Ying Liu
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Tensile Properties ◽  
Process Parameters ◽  
Spherical Shape ◽  
Deformation Degree ◽  
Isothermal Forging ◽  
Forging Process ◽  
Α Phase ◽  
Strip Shape

In this paper the effect of isothermal forging process parameters on the microstructure and the mechanical properties of TA15 titanium alloy was researched. The results of the tests indicate that, in the range of temperature of 850 °C~980 °C and deformation degree of 20%~60%, with the increase of temperature or deformation, as the reinforcement of deformation recrystallization, the primary α-phase tends to the spherical shape and secondary α-phase transforms from the acicular shape to fine and spherical shape with disperse distribution, which enhance the tensile properties at room and high temperature. With the increment of forging times, the spheroidization of primary α-phase aggrandizes and secondary α-phase transforms from spherical and acicular shape to wide strip shape, which decrease the tensile properties at room and high temperature. The preferable isothermal forging process parameters are temperature of 980 °C, deformation degree of 60%, and few forging times.

Effect of Near-Isothermal Forging Temperature on the Microstructure and Mechanical Properties of Near α High Temperature Titanium Alloy

2017 ◽  
Vol 898 ◽  
pp. 579-585 ◽  
Author(s):  
Tao Li ◽  
Li Hua Chai ◽  
Shao Hui Shi ◽  
Zhi Lei Xiang ◽  
Yong Shuang Cui ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
High Temperature ◽  
Strain Rate ◽  
Grain Growth ◽  
Isothermal Forging ◽  
Microstructure And Mechanical Properties ◽  
Strength And Plasticity

The effect of near-isothermal forging temperature on the microstructure and mechanical properties of Ti-Al-Sn-Zr-Mo-Nb-W-Si-Er near α high temperature titanium alloy was investigated by near-isothermal forging at the strain rate of 0.01s-1 and 80% deformation. The results indicated that near-isothermal forging temperature of 1050°C is relatively low. After forging at 1050°C the grain growth is not obvious and original β grain as well as intragranular lamellar are fine. By comparison, the alloy forged at 1120°C possessed typical basket weave microstructure. With the increase of near-isothermal forging temperature, the tensile strength and plasticity of the alloy decrease. Excellent comprehensive mechanical properties could be achieved in the alloy after forging at temperature 1050°C.

scholarly journals Preparation and Mechanical Properties of ZK61-Y Magnesium Alloy Wheel Hub via Liquid Forging—Isothermal Forging Process

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 385
Author(s):  
Yushi Qi ◽  
Heng Wang ◽  
Lili Chen ◽  
Hongming Zhang ◽  
Gang Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Heat Treatments ◽  
Second Phase ◽  
Phase Hardening ◽  
Isothermal Forging ◽  
Forging Process ◽  
Microstructure And Mechanical Properties ◽  
Alloy Wheel

A ZK61-Y magnesium (Mg) alloy wheel hub was prepared via liquid forging—isothermal forging process. The effects of Y-element contents on the microstructure and mechanical properties of liquid forging blanks were investigated. The formation order of the second phase was I-phase (Mg3Zn6Y) → W-phase (Mg3Zn3Y2) → Z-phase (Mg12ZnY) with the increase of the Y-element content. Meanwhile, the I-phase and Z-phase formed in the liquid forging process were beneficial to the grain refinement. The numerical simulation of the isothermal forging process was carried out to analyze the effects of forming temperature on the temperature and stress field in the forming parts using the software Deform-3D. Isothermal forging experiments and post heat treatments were conducted. The influence of isothermal forging temperature, heat treatment temperature and preservation time on the microstructure and mechanical properties of the forming parts were also studied. The dynamic recrystallization (DRX), second-phase hardening, and work hardening account for the improvement of properties after the isothermal forging process. The forming part forged at 380 °C displayed the outstanding properties. The elongation, yield strength, and ultimate tensile strength were 18.5%, 150 MPa and 315 MPa, respectively. The samples displayed an increased elongation and decreased strength after heat treatments. The 520 °C—1 h sample possessed the best mechanical properties, the elongation was 25.5%, the yield stress was 125 MPa and the ultimate tensile strength was 282 MPa. This can be ascribed to the recrystallization and the elimination of working hardening. Meanwhile, the second phase transformation (I-phase → W-phase → Mg2Y + MgZn2), dissolution, and decomposition can be observed, as well.

The Influence of the Deformation Degree on the Mechanical Properties and Microstructures of the Blanks Obtained by Tube and Wire Drawing

2017 ◽  
Vol 1143 ◽  
pp. 85-90 ◽  
Author(s):  
Octavian Potecaşu ◽  
Florentina Potecaşu ◽  
Mihaela Marin ◽  
Florin Bogdan Marin ◽  
Florica Chicoş
Keyword(s):  
Mechanical Properties ◽  
Wire Drawing ◽  
Strength Properties ◽  
Three Dimensions ◽  
Deformation Degree ◽  
Metallic Material ◽  
Materials Used ◽  
Strength And Plasticity ◽  
Hot Rolled ◽  
Rolled Wire

In this paper is describe the influence of the deformation degree on the mechanical properties and microstrucure of the blanks obtained by tube and wire drawing. The materials used for this study are represented by two different samples: hot rolled wire rod and wire for concrete reinforcement with periodic profile (drawn wire) with three dimensions of obtained diameter ( d1 = 5.00 mm, d2= 4 mm and d3= 3,5 mm). The results reveal that the strength properties of the samples are increasing with an increase in the degree of deformation, while the plasticity properties are lowering.The purpose of this paper is to evidence the changes in the structure, the strength and plasticity properties depending on the deformation degree and section reducing of the metallic material.

Mechanical Properties of Ti–6Al–4V Titanium Alloy with Submicrocrystalline Structure Produced by Multiaxial Forging

2008 ◽  
Vol 584-586 ◽  
pp. 783-788 ◽  
Author(s):  
Gennady A. Salishchev ◽  
Sergey V. Zherebtsov ◽  
Svetlana Malysheva ◽  
A. Smyslov ◽  
E. Saphin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Fatigue Limit ◽  
Comparative Investigation ◽  
Submicrocrystalline Structure ◽  
Coarse Grained ◽  
Isothermal Forging ◽  
Microcrystalline Alloy ◽  
The Impact

A comparative investigation of mechanical properties of Ti–6Al–4V titanium alloy with coarse-grained (400 m), microcrystalline (10 µm) and submicrocrystalline (0.4 µm) structures in the temperature range 20–500°C has been carried out. The submicrocrystalline structure was obtained by multiaxial isothermal forging. The alloys with the coarse-grained and microcrystalline structures were used in a heat-strengthened condition. The microstructure refinement increases both the strength and fatigue limit of the alloy at room temperature by about 20%. The strength of the submicrocrystalline alloy is higher than that of the microcrystalline alloy in the range 20 - 400°C. Long-term strength of the submicrocrystalline specimens below 300°C is also considerably higher than that of the other conditions. However, the creep strength of the submicrocrystalline alloy is slightly lower than that of the heat-strengthened microcrystalline alloy already at 250°C. The impact toughness in submicrocrystalline state is lower especially in the samples with introduced cracks. Additional surface modification of submicrocrystalline alloy by ion implantation gives a considerable increase in the fatigue limit. Advantages of practical application of submicrocrystalline titanium alloys produced by multiaxial isothermal forging have been evaluated.

FE Simulation of Grain Size during the Isothermal Forging of a TC6 Titanium Alloy Disc

2005 ◽  
Vol 475-479 ◽  
pp. 3177-3180 ◽  
Author(s):  
A.M. Xiong ◽  
Wei Chao Huang ◽  
S.H. Chen ◽  
Miao Quan Li
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Constitutive Equation ◽  
Fe Simulation ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Maximum Difference ◽  
Compression Tests ◽  
Isothermal Forging ◽  
Forging Process

Isothermal compression tests were conducted at Thermecmaster-Z simulator, and grain size of the prior a phase was measured at a Leica LABOR-LUX12MFS/ST microscope for quantitative metallography. A methodology to establish a constitutive equation with grain size was proposed with the help of the experimental results. Combining FEM and the present constitutive equation at high temperature deformation, grain size of the prior a phase was simulated during the isothermal forging of a TC6 titanium alloy disc. The present results illustrate grain size and distribution of the prior a phase in the forging process of TC6 titanium alloy disc in detail. The maximum difference between the calculated results and the experimental is not more than 15%.

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