A Method of Establishing Dynamic Recrystallization Model of Aluminum Alloy Using True Stress-True Strain Curve
A recrystallization, true-strain technique applied in the direction of testing material strength using applied steady tension/compression
Inactive Publication Date: 2015-07-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0003] Aiming at the existing method of determining the mathematical model of dynamic recrystallization by metallographic method, the present invention proposes a method of establishing the mathematical model of dynamic recrystallization of aluminum alloy by using true stress-true strain curve
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[0025] 5083 plate was used in the test, and its chemical composition (mass fraction) is shown in Table 1
[0026] Table 1 Test 5083 plate chemical composition
[0027] Si
Fe
Cu
mn
Mg
Cr
Ni
Zn
Ti
Zr
be
Na
V
Al
0.08
0.05
0.01
0.6
4.61
0.1
0.15
0.034
0.029
0.24
0.0006
0.0008
0.048
the remaining
[0028] The high-temperature single-tension test is carried out on a computer-controlled electronic universal thermal tensile testing machine RG2000-20, and the geometric dimensions of the sample are as follows: figure 1 As shown, the sheet thickness is 2mm.
[0029] The strain rate used was 6.56×10 -5 ~6.56×10 -3 S -1 ;The temperature is 623K, 673K, 723K, 773K, 793K, 808K. The sample needs to be kept warm for 5 minutes before tensile deformation, so that the sample evenly reaches the set target temperature.
[0030] The hardening rate was calculated from t...
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Abstract
The invention discloses a method for establishing an aluminium alloy dynamic recrystallization model by using a true stress-true strain curve, belonging to the field of analyzing of material microstructures. The method comprises the following steps of: obtaining a hardening rate of a material by adopting the true stress-true strain curve obtained through a high-temperature tensile test, determining peak value strain, peak value stress and steady-state stress under different conditions by analyzing the change of the hardening rate, and establishing a peak value strain and critical strain mathematical model and a dynamic recrystallization volume fraction according to an empirical formula. The method disclosed by the invention overcomes the disadvantages of being lagging, time-consuming, incomplete and imprecise by using a metallographic method to research the recrystallization behaviour of the material. After being combined with finite element software, the method is capable of quantitatively analyzing the change condition of the dynamic recrystallization volume fraction of aluminium alloy.
Description
technical field [0001] The invention belongs to the field of material microstructure analysis, and mainly relates to a method for establishing a dynamic recrystallization mathematical model of an aluminum alloy by using a true stress-true strain curve. Background technique [0002] The superplastic forming technology developed by using the excellent deformation properties of aluminum alloy in the superplastic state can form parts with complex shapes on small-tonnage equipment that are difficult or impossible to form by other plastic processing techniques, and can meet the requirements for the forming of aluminum alloy parts for rail vehicles need. Aluminum alloy has the advantages of high strength, good plasticity, corrosion resistance and processability, and has become a popular material for superplastic forming in the automobile and rail transit industries. It can greatly reduce the weight of vehicles and promote energy-saving and environmental protection in the transporta...
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IPC IPC(8): G01N3/18
Inventor 鲁世红刘倩金霞周清史学刚陈星
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS