Effects of Die Temperature on Microstructure Evolution of 7A85 Aluminum Forging

2014 ◽  
Vol 633-634 ◽  
pp. 628-633
Author(s):  
Jian Liang Hu ◽  
You Ping Yi ◽  
Shi Quan Huang
Keyword(s):  
Uniform Distribution ◽  
Microstructure Evolution ◽  
Isothermal Forging ◽  
Forging Process ◽  
Medium Scale ◽  
Aluminum Forging ◽  
Die Temperature ◽  
Precipitated Phases ◽  
High Degree ◽  
Distribution Of Dislocations

The free forging process of medium scale specimen was carried out to study the effects of the die temperature on the microstructure evolution of 7A85 aluminum forging. The results show that with the increase of die temperature, the size of the grains and the distribution of dislocations and precipitates of free forging tend to have a high degree of uniformity. Considering the effects of die temperature, the isothermal forging process was applied for the deformation of complex aviation forging. The metal flows smoothly during the isothermal forging process and thus there is little possibility of forming unfill, crack and other defects. The dislocations are evenly distributed during the isothermal forging process. Consequently, there is a relatively uniform distribution of precipitated phases of the aviation forging.

Microstructure Evolution of Mg-10Gd-2Y-0.5Zn-0.3Zr Alloy during Isothermal Forging Process

2014 ◽  
Vol 783-786 ◽  
pp. 485-490
Author(s):  
De Bin Shan ◽  
X.Z. Han ◽  
Wen Chen Xu
Keyword(s):  
Microstructure Evolution ◽  
Ageing Time ◽  
High Strength ◽  
Aged Alloy ◽  
Secondary Phases ◽  
Obvious Effect ◽  
Isothermal Forging ◽  
Forging Process ◽  
The Matrix ◽  
Peak Aged

The isothermal forging process of a bracket and its microstructure evolution of Mg-10Gd-2Y-0.5Zn-0.3Zr alloy have been investigated in the present study. The results show that the bracket with thin-web and high-rib is well formed through modifying corners and adding an active damping block into male die. Amounts of lamellae and particles distribute uniformly on the matrix after the isothermal forging process and ageing process. The isothermal forging process has an obvious effect on the precipitation behaviour of secondary phases, while it did not change the grain size greatly. With the increase of ageing time, more secondary phases precipitate from α-Mg matrix until 60h. The optimal ultimate tensile strength and elongation of the peak-aged alloy are 382MPa and 4.03%, respectively. The combined effects of LPO and β′ phases contribute to the high strength of the peak-aged 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.

scholarly journals Microstructure Evolution of AZ80 Magnesium Alloy during Multi-Directional Forging Process

2014 ◽  
Vol 55 (2) ◽  
pp. 270-274 ◽  
Author(s):  
Qingfeng Zhu ◽  
Lei Li ◽  
Zhiqiang Zhang ◽  
Zhihao Zhao ◽  
Yubo Zuo ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Microstructure Evolution ◽  
Forging Process ◽  
Az80 Magnesium Alloy

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.

FEM simulation of hot forging process to predict microstructure evolution

2013 ◽  
Author(s):  
Shi-Hong Zhang ◽  
Hai-Yan Zhang ◽  
Hong-Wu Song ◽  
Ming Cheng
Keyword(s):  
Microstructure Evolution ◽  
Hot Forging ◽  
Fem Simulation ◽  
Forging Process ◽  
Hot Forging Process

Deformation Behaviors of Non-Metallic Inclusion in FGH96 Superalloy during Different Plastic Processes

2012 ◽  
Vol 538-541 ◽  
pp. 1187-1191
Author(s):  
Min Cong Zhang ◽  
Chen Yi Liu ◽  
Shu Yun Wang
Keyword(s):  
Transition Zone ◽  
Extrusion Direction ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Metallic Inclusion ◽  
Isothermal Forging ◽  
Forging Process ◽  
Discontinuous Line ◽  
Metallic Inclusions ◽  
Deformation Behaviors

The non-metallic inclusions in FGH96 superalloy during different plastic processes were studied. The results show that SiO2 react with aluminum and titanium in FGH96 superalloy and the reaction zone is formed in the interface between SiO2 and alloy, whereas Al2O3 react with no elements in FGH96 superalloy and the transition zone between them is mechanical combination during the plastic processes. In addition the sizes of non-metallic inclusions increase in the direction perpendicular to deformation during isothermal forging process. The non-metallic inclusions are pulled into a discontinuous line in extrusion direction and areas of non-metallic inclusions in each direction are constricted during extrusion process. The non-metallic inclusions of FGH96 superalloy is conditioned by the state of the as-extrusion inclusions during extrusion+isothermal forging process. In summary, extrusion process with large extrusion ratio can break the non-metallic inclusions in FGH96 alloy effectively and improve forging quality.

Analysis of Microstructure Evolution in the Forging Process of a Windmill Main Shaft

2006 ◽  
Vol 77 (8) ◽  
pp. 583-589 ◽  
Author(s):  
Jan Sińczak ◽  
Piotr Skubisz ◽  
Maciej Pietrzyk ◽  
Aneta Łukaszek-Sołek
Keyword(s):  
Microstructure Evolution ◽  
Main Shaft ◽  
Forging Process

Microstructure Evolution of Dynamic Recrystallization of 42CrMo Steel during Multi-Stage Forging by FEM

2012 ◽  
Vol 217-219 ◽  
pp. 415-418 ◽  
Author(s):  
Dong Yang ◽  
Wen Lin Chen ◽  
Rui Zhou ◽  
Shao Yang Wang ◽  
Yong Ma ◽  
...  
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Forging Process ◽  
42Crmo Steel ◽  
Multi Stage

Different process steps of the workpiece have different effects on the microstructure in the multi-stage forging. In this study, the effect of four different process steps of steering arm on microstructure was studied by FEM. Results have showed that upsetting is beneficial to refine the microstructure as well as finish forging. Especially drawing can make the distribution of microstructure homogeneous while bending has less effect on it. The already-designed forging process for steering arm was reasonable based on the simulation. Eventually, the grain size level of the steering arm was tested as 6.5 based on the conventional standard.

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