CN114692401B - Optimization method for full-lamellar gamma titanium aluminum alloy plasticizing deformation technological parameters - Google Patents
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005457 optimization Methods 0.000 title claims abstract description 8
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 title claims description 35
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims abstract description 39
- 230000035945 sensitivity Effects 0.000 claims abstract description 35
- 230000006835 compression Effects 0.000 claims abstract description 34
- 238000007906 compression Methods 0.000 claims abstract description 34
- 238000004088 simulation Methods 0.000 claims abstract description 23
- 238000010586 diagram Methods 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 238000012669 compression test Methods 0.000 claims description 6
- 238000005336 cracking Methods 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 229910000946 Y alloy Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention provides an optimization method of all-lamellar gamma-titanium-aluminum alloy plasticizing deformation process parameters, which comprises the steps of calculating deformation speed sensitivity index values, energy dissipation values and plastic flow instability parameter values of all-lamellar gamma-titanium-aluminum alloy by adopting flow stress and strain data obtained by a thermal simulation compression deformation test under the combination condition of different deformation process parameters; respectively drawing an energy dissipation rate contour map and a plastic flow instability contour map; constructing a thermal processing window diagram according to the macroscopic cracking condition of the sample obtained by the thermal simulation compression deformation test; and (3) corresponding the thermal processing window graph with the deformation speed sensitivity index value, the energy dissipation rate contour graph and the plastic flow instability contour graph to obtain a deformation speed sensitivity index value, an energy dissipation rate value and a plastic flow instability parameter value range of the whole-sheet gamma-titanium aluminum alloy, wherein the deformation speed sensitivity index value, the energy dissipation rate value and the plastic flow instability parameter value range of the whole-sheet gamma-titanium aluminum alloy are macroscopically not cracked in the high-temperature deformation process, and accurately optimizing the whole-sheet gamma-titanium aluminum alloy high-temperature deformation process parameter range to enable the result to be more reasonable.
Description
Technical Field
The invention relates to the field of high-temperature plastic deformation of alloy materials, in particular to a reasonable parameter determination method of a titanium-aluminum alloy plasticizing deformation process.
Background
The gamma titanium aluminum alloy has the advantages of low density, high specific strength and rigidity, good oxidation resistance and corrosion resistance, good creep property and the like, has the potential of replacing the traditional nickel-based superalloy or steel with higher density, is also the most advantageous metal structure material for replacing the traditional superalloy, and is respectively applied to the fields of turbocharger impellers, low-pressure turbine blades and the like of modern aeroengines and high-performance automobile engines.
The gamma-titanium aluminum alloy has four microstructures, and the comprehensive mechanical property of the whole-sheet gamma-titanium aluminum alloy is best, but the gamma-titanium aluminum alloy has intrinsic brittleness, is difficult to deform, has poor processability and has a narrow deformation temperature range. If the process parameters are improperly selected, the gamma-titanium-aluminum alloy part is easy to generate defects such as cracks, heat insulation shearing bands and the like in the high-temperature deformation process, so that the part cannot meet the use requirement, therefore, the plasticizing deformation process has wide application prospect in manufacturing the gamma-titanium-aluminum alloy part, and the whole-sheet gamma-titanium-aluminum alloy part meeting the use requirement can be obtained by optimizing and selecting reasonable plasticizing deformation process parameters.
"Kong Fantao, zhang Shuzhi, chen Yuyong. High temperature deformation and working diagram of Ti-46Al-2Cr-4Nb-Y alloy [ J ]. Chinese report of nonferrous metals, 2010,20 (S1): 233-236." flow stress and strain data of Ti-46Al-2Cr-4Nb-Y alloy obtained by thermal simulation compression test method under different deformation temperatures and deformation speeds are reported, and a dynamic material model is adopted to establish a thermal working diagram of Ti-46Al-2Cr-4Nb-Y alloy, and a reasonable technological parameter range of Ti-46Al-2Cr-4Nb-Y alloy is determined. The method is characterized in that the deformation process parameters of Ti-46Al-2Cr-4Nb-Y alloy are optimized by considering the influence of the energy dissipation rate and the instability parameters; however, no criterion for optimizing the high-temperature deformation process parameters of the titanium-aluminum alloy is explicitly provided, no macroscopic cracking condition is mentioned during thermal simulation compression of the Ti-46Al-2Cr-4Nb-Y alloy sample, the determined high-temperature deformation process parameters are inaccurate, and the high-temperature deformation process parameters of the gamma titanium-aluminum alloy cannot be optimized in practice.
Disclosure of Invention
The invention aims to avoid the defects of the prior art, and provides an optimization method capable of optimizing the high-temperature deformation process parameters of the whole-sheet gamma-titanium-aluminum alloy and improving the plasticization deformation process parameters of the whole-sheet gamma-titanium-aluminum alloy in the high-temperature deformation process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an optimization method of all-sheet gamma titanium aluminum alloy plasticizing deformation process parameters comprises the following steps:
step one, at the deformation temperature of 1100-1260 ℃, the deformation speed of 0.001-1 s -1 Under the condition that the deformation is 50%, carrying out a thermal compression test on the full-sheet gamma-titanium aluminum alloy to obtain flow stress sigma and strain epsilon data of the full-sheet gamma-titanium aluminum alloy under the condition of different deformation temperatures and deformation speeds;
calculating a deformation speed sensitivity index value m, an energy dissipation value eta and a plastic flow instability parameter value zeta of the full-sheet gamma titanium-aluminum alloy after high-temperature compression deformation according to the flow stress sigma and flow strain epsilon data;
drawing an energy dissipation rate contour map and a plastic flow instability parameter contour map of the whole-sheet gamma titanium aluminum alloy during high-temperature compression deformation respectively by taking the logarithmic deformation speed as an abscissa and the deformation temperature as an ordinate according to the energy dissipation rate eta and the plastic flow instability parameter value xi;
step four, taking the whole-sheet gamma titanium aluminum alloy sample after the thermal simulation compression deformation test in the step one, and constructing a whole-sheet gamma titanium aluminum alloy thermal processing window diagram;
step five, the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value xi obtained in the step two are corresponding to a hot working window diagram with a structure in the step four, and the actual deformation speed sensitivity index value m is respectively corresponding to the situation that the whole sheet gamma titanium aluminum alloy sample macroscopically cracks and does not crack Real world Energy dissipation value η Real world Plastic flow instability parameter value xi Real world Is defined by the range of (2);
and obtaining the preferable technological parameters of the deformation temperature and the deformation speed of the full-sheet gamma-titanium-aluminum alloy sample after thermal simulation compression deformation through corresponding the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value zeta obtained in the step two.
Further, the first step specifically includes: at each temperature point with the deformation temperature of 1100 ℃, 1140 ℃, 1180 ℃, 1220 ℃ and 1260 ℃, the deformation speed of the whole-sheet gamma-titanium-aluminum alloy is 0.001s -1 、0.01s -1 、0.1s -1 、1s -1 The thermal simulation compression deformation test of the alloy is carried out, the deformation amount is 50%, and the flow stress sigma and the strain epsilon data of the whole-sheet gamma titanium aluminum alloy under the combination of five deformation temperatures and four deformation speed conditions are respectively obtained.
In the second step, the deformation speed sensitivity index value m of the whole lamellar gamma titanium aluminum alloy after high temperature compression deformation is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 ) The method comprises the steps of carrying out a first treatment on the surface of the σ is the flow stress (MPa); epsilon is the strain; t is the absolute deformation temperature (K);
the energy dissipation value eta is obtained by the following formula:
wherein m is a deformation speed sensitivity index;
the plastic flow instability parameter value xi is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 )。
The beneficial effects of the invention are as follows: according to the flow stress and strain data obtained by adopting a thermal simulation compression test method under the combination condition of different deformation process parameters, calculating a deformation speed sensitivity index value m, an energy dissipation value eta and a plastic flow instability parameter value zeta; respectively drawing an energy dissipation rate contour map and a plastic flow instability parameter contour map of the whole-sheet gamma titanium aluminum alloy during deformation by taking the logarithmic deformation speed as an abscissa and the deformation temperature as an ordinate; according to a sample structure thermal processing window diagram obtained after thermal simulation compression deformation, an energy dissipation rate diagram and a plastic flow instability diagram are combined, the ranges of a deformation speed sensitivity index value m, an energy dissipation rate value eta and a plastic flow instability parameter value zeta corresponding to the condition that the thermal simulation compression sample is free of macroscopic cracking are selected, and the technological parameters of the plasticization deformation of the whole-sheet gamma titanium-aluminum alloy are optimized.
Drawings
FIG. 1 is a contour plot of energy dissipation ratio at the time of an alloy thermal compression set test of the present invention;
FIG. 2 is a contour plot of plastic flow instability parameters of an alloy of the present invention;
FIG. 3 is a graph of a thermal processing window of the alloy of the present invention upon thermal compression set.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
In order to achieve the above object, the present invention provides the following embodiments:
example 1: as shown in fig. 1-3, the optimization method of the whole-sheet gamma titanium aluminum alloy plasticizing deformation process parameters comprises the following steps:
step one, at each temperature point with the deformation temperature of 1100 ℃, 1140 ℃, 1180 ℃, 1220 ℃ and 1260 ℃, the deformation speed of the whole-sheet gamma-titanium-aluminum alloy is 0.001s respectively -1 、0.01s -1 、0.1s -1 、1s -1 Is a thermal simulation of (2)And (3) carrying out compression deformation test, wherein the deformation amount is 50%, and the flow stress sigma and strain epsilon data of the whole-sheet gamma titanium aluminum alloy under the combination of five deformation temperatures and four deformation speed conditions are respectively obtained.
Calculating a deformation speed sensitivity index value m, an energy dissipation value eta and a plastic flow instability parameter value zeta of the whole-sheet gamma titanium aluminum alloy after high-temperature compression deformation according to the flow stress sigma and strain epsilon data;
the deformation speed sensitivity index value m of the whole-sheet gamma titanium aluminum alloy after high-temperature compression deformation is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 ) The method comprises the steps of carrying out a first treatment on the surface of the σ is the flow stress (MPa); epsilon is the strain; t is the absolute deformation temperature (K);
the energy dissipation value eta is obtained by the following formula:
wherein m is a deformation speed sensitivity index;
the plastic flow instability parameter value xi is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 )。
Drawing an energy dissipation rate contour map and a plastic flow instability parameter contour map of the whole-sheet gamma titanium aluminum alloy during high-temperature compression deformation respectively by taking the logarithmic deformation speed as an abscissa and the deformation temperature as an ordinate according to the energy dissipation rate eta and the plastic flow instability parameter value xi;
step four, taking the whole-sheet gamma titanium aluminum alloy sample after the thermal simulation compression deformation test in the step one, and constructing a whole-sheet gamma titanium aluminum alloy thermal processing window diagram;
step five, the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value xi obtained in the step two are corresponding to a hot working window diagram with a structure in the step four, and the actual deformation speed sensitivity index value m is respectively corresponding to the situation that the whole sheet gamma titanium aluminum alloy sample macroscopically cracks and does not crack Real world Energy dissipation value η Real world Plastic flow instability parameter value xi Real world Is defined by the range of (2);
and obtaining the preferable technological parameters of the deformation temperature and the deformation speed of the full-sheet gamma-titanium-aluminum alloy sample after thermal simulation compression deformation through corresponding the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value zeta obtained in the step two.
Specific calculation examples: referring to fig. 1-3, the optimization method of the full-sheet gamma titanium aluminum alloy plasticizing deformation process parameters comprises the following specific steps:
(a) The deformation temperature is selected to be 1100 ℃, 1140 ℃, 1180 ℃, 1220 ℃, 1260 ℃ and the deformation speed is selected to be 0.001s -1 、0.01s -1 、0.1s -1 、1s -1 Under the condition of 50% of deformation, respectively carrying out thermal simulation compression test on the full-sheet Ti-46.5Al-2Nb-2Cr alloy to obtain flow stress sigma and strain epsilon data of the full-sheet Ti-46.5Al-2Nb-2Cr alloy during thermal simulation compression deformation;
(b) According to the flow stress and strain data obtained in the step (a), respectively calculating deformation speed sensitivity index value m of the full-lamellar Ti-46.5Al-2Nb-2Cr alloy after thermal simulation compression under each group of deformation temperature and deformation speed combination conditions through formulas (1) to (3), and then calculating energy dissipation value eta and plastic flow instability parameter value zeta, wherein the calculation results are shown in table 1;
in the formulas (1), (2) and (3), m is a deformation speed sensitivity index;is the deformation speed(s) -1 ) The method comprises the steps of carrying out a first treatment on the surface of the σ is the flow stress (MPa); epsilon is the strain; t is the absolute deformation temperature (K); η is the energy dissipation ratio; ζ is a plastic flow destabilization parameter;
TABLE 1
(c) According to the energy dissipation value eta and the plastic flow instability parameter value zeta calculated in the table 1, taking the logarithmic deformation speed as an abscissa and the deformation temperature as an ordinate, respectively constructing an energy dissipation rate contour map of the full-sheet Ti-46.5Al-2Nb-2Cr alloy during thermal simulation compression deformation, as shown in figure 1, and a plastic flow instability parameter contour map, as shown in figure 2;
(d) Constructing a thermal processing window diagram of the full-sheet Ti-46.5Al-2Nb-2Cr alloy during thermal compression deformation according to the full-sheet gamma titanium aluminum alloy sample after the thermal simulation compression deformation test in the step (a), as shown in figure 3;
(e) Corresponding the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value zeta in the table 1 to the hot working window graph in the step (d) to obtain the ranges of the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value zeta of the full-sheet Ti-46.5Al-2Nb-2Cr alloy thermal simulation compression sample under the conditions of macroscopic cracking and non-cracking respectively, wherein the ranges are shown in the table 2;
TABLE 2
| Whether or not to crack | m value | Eta value | Value of xi |
| Is that | 0.06361～0.26281 | 0.11961～0.41623 | -0.20534～0.21675 |
| Whether or not | 0.13259～0.40521 | 0.23414～0.57673 | 0.01217～0.29754 |
By combining the results, when the deformation speed sensitivity index value m is larger than 0.25, the energy dissipation value eta is larger than 0.4 and the plastic flow instability parameter value zeta is larger than 0, the plasticity ratio of the full-sheet Ti-46.5Al-2Nb-2Cr alloy at high temperature compression deformation is better, and the corresponding technological parameter ranges are obtained, wherein the technological parameter ranges comprise: the deformation temperature is 1220-1260 ℃ and the deformation speed is 0.01s -1 ～0.001s -1 ；
According to the result, selecting proper total sheet Ti-46.5Al-2Nb-2Cr alloy plasticizing deformation process parameters as shown in table 3, wherein the high-temperature deformation plasticity is the best;
table 3;
| deformation temperature/. Degree.C | Deformation speed/s -1 |
| 1220 | 0.001 |
| 1260 | 0.01，0.001 |
Example 2 is the same as example 1, except that the first step is specifically: at each temperature point with the deformation temperature of 1100-1260 ℃, the corresponding deformation speed is 0.001-1 s -1 And (3) carrying out a thermal simulation compression test on the whole-sheet gamma-titanium aluminum alloy at each speed point, wherein the deformation is 50%, and obtaining flow stress sigma and strain epsilon data of the whole-sheet gamma-titanium aluminum alloy under the combination of different deformation temperatures and deformation speed conditions during high-temperature compression deformation.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The optimization method of the full-sheet gamma titanium aluminum alloy plasticizing deformation process parameters is characterized by comprising the following steps of:
step one, at the deformation temperature of 1100-1260 ℃, the deformation speed of 0.001-1 s -1 Under the condition of 50% of deformation, carrying out thermal simulation compression test on the whole lamellar gamma titanium aluminum alloy to obtainThe data of the high-temperature compression deformation flow stress sigma and the strain epsilon of the full-sheet gamma titanium aluminum alloy under the condition combination of different deformation temperatures and deformation speeds;
calculating a deformation speed sensitivity index value m, an energy dissipation value eta and a plastic flow instability parameter value zeta of the whole-sheet gamma titanium aluminum alloy after high-temperature compression deformation according to the flow stress sigma and strain epsilon data;
drawing an energy dissipation rate contour map and a plastic flow instability parameter contour map of the whole-sheet gamma titanium aluminum alloy during high-temperature compression deformation respectively by taking the logarithmic deformation speed as an abscissa and the deformation temperature as an ordinate according to the energy dissipation rate eta and the plastic flow instability parameter value xi;
step four, taking the whole-sheet gamma titanium aluminum alloy sample after the thermal simulation compression deformation test in the step one, and constructing a whole-sheet gamma titanium aluminum alloy thermal processing window diagram;
step five, the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value xi obtained in the step two are corresponding to a hot working window diagram with a structure in the step four, and the actual deformation speed sensitivity index value m is respectively corresponding to the situation that the whole sheet gamma titanium aluminum alloy sample macroscopically cracks and does not crack Real world Energy dissipation value η Real world Plastic flow instability parameter value xi Real world Is defined by the range of (2);
and obtaining the preferable technological parameters of the deformation temperature and the deformation speed of the full-sheet gamma-titanium-aluminum alloy sample after thermal simulation compression deformation through corresponding the deformation speed sensitivity index value m, the energy dissipation value eta and the plastic flow instability parameter value zeta obtained in the step two.
2. The method for optimizing the plasticizing deformation process parameters of the full-sheet gamma-titanium aluminum alloy according to claim 1, wherein the step one specifically comprises the following steps: at each temperature point with the deformation temperature of 1100 ℃, 1140 ℃, 1180 ℃, 1220 ℃ and 1260 ℃, the deformation speed of the whole-sheet gamma-titanium-aluminum alloy is 0.001s -1 、0.01s -1 、0.1s -1 、1s -1 Is a thermal analog compression change of (2)And (3) carrying out a shape test, wherein the deformation amount is 50%, and the flow stress sigma and strain epsilon data of the whole-sheet gamma titanium aluminum alloy under the combination of five deformation temperatures and four deformation speed conditions are respectively obtained.
3. The method for optimizing the plasticizing deformation process parameters of the full-sheet gamma-titanium aluminum alloy according to claim 1, wherein in the second step, the deformation speed sensitivity index value m of the full-sheet gamma-titanium aluminum alloy after high-temperature compression deformation is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 ) The method comprises the steps of carrying out a first treatment on the surface of the σ is the flow stress (MPa); epsilon is the strain; t is the absolute deformation temperature (K);
the energy dissipation value eta is obtained by the following formula:
wherein m is a deformation speed sensitivity index;
the plastic flow instability parameter value xi is obtained by the following formula:
wherein m is a deformation speed sensitivity index;is the deformation speed(s) -1 )。
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