CN102706920A - Method for evaluating mixed crystal formation tendency of single-crystal high-temperature alloys - Google Patents
Method for evaluating mixed crystal formation tendency of single-crystal high-temperature alloys Download PDFInfo
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- CN102706920A CN102706920A CN2012101385977A CN201210138597A CN102706920A CN 102706920 A CN102706920 A CN 102706920A CN 2012101385977 A CN2012101385977 A CN 2012101385977A CN 201210138597 A CN201210138597 A CN 201210138597A CN 102706920 A CN102706920 A CN 102706920A
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- 239000013078 crystal Substances 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 26
- 239000000956 alloy Substances 0.000 title claims abstract description 26
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 16
- 241001310793 Podium Species 0.000 claims description 35
- 229910000601 superalloy Inorganic materials 0.000 claims description 32
- 238000013461 design Methods 0.000 claims description 7
- 238000004781 supercooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000005495 investment casting Methods 0.000 abstract 1
- 230000000638 stimulation Effects 0.000 abstract 1
- 238000011158 quantitative evaluation Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
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Abstract
The invention relates to the technology of investment casting, in particular to a method for evaluating mixed crystal formation tendency of single-crystal high-temperature alloys. Molds A with different platform lengths and molds B with different platform heights are designed, and single-crystal castings A and B of various alloys are cast according to the molds. Mixed alloy formation abilities of the alloys are quantitatively evaluated by analyzing the platform lengths and the platform heights which are formed by mixed crystals in the castings A and B. The low minimum platform length formed by the mixed crystals or the high maximum platform height formed by the mixed crystals indicates high mixed crystal formation tendency of the alloys. On the premise that solidification conditions are unchanged and stimulation technique is not adopted, the mixed crystal formation abilities of the different single-crystal high-temperature alloys can be quantitatively represented. By the aid of the method, the problem that mixed crystal formation tendency of the single-crystal high-temperature alloys is difficult to evaluated, the mixed crystal formation abilities of the different single-crystal high-temperature alloys in a directional solidification process are quantitatively evaluated, and evidence for selecting single-crystal high-temperature alloys with weak mixed crystal formation tendency in actual production is provided.
Description
Technical field:
The present invention relates to the investment cast technology, be specially a kind of single crystal super alloy stray crystal and form tendentious assessment method.
Background technology:
Single crystal super alloy has become the main material of gas turbine engine blade because of its excellent performance.In the casting process of single crystal casting; Because of the complicated geometric configuration of foundry goods; And the interpolation of refractory elements in a large number in the single crystal super alloy, stray crystal often occurring and form the situation that causes single crystal casting to be scrapped, this has become a common difficult problem that influences the single crystal super alloy preparation.Thereby, in actual production process, should select stray crystal to form the more weak single crystal super alloy of tendentiousness and improve yield rate and reduce production costs.
Summary of the invention:
The object of the present invention is to provide a kind of single crystal super alloy stray crystal to form tendentious assessment method.Do not changing curing condition and do not using under the prerequisite of analogue technique, can quantitatively characterizing the stray crystal of different single crystal super alloys form ability.Therefore, the maximum superiority of the present invention is the different single crystal super alloy tendentiousness that stray crystal forms in the directional solidification process of quantitative assessment, solves the single crystal super alloy stray crystal and forms the problem that tendentiousness is difficult to estimate.
Technical scheme of the present invention is:
A kind of single crystal super alloy stray crystal forms tendentious assessment method; The theory that stray crystal forms when surpassing critical forming core degree of supercooling according to the degree of supercooling of platform edge; Design two kinds of symmetrical mold A and B with different platform length and height; Longer or the strong more rule of the more little stray crystal formation tendentiousness of podium level through land lengths, the quantitative assessment stray crystal forms tendentiousness.
Described single crystal super alloy stray crystal forms tendentious assessment method, and mould A has different platforms length and constant podium level: land lengths is 1-50mm, and podium level is 1-10mm; Mould B has constant land lengths and different platforms height: land lengths is 10-30mm, and podium level is 0.2-20mm.
Described single crystal super alloy stray crystal forms tendentious assessment method, and along the direction of solidifying from bottom to top, the land lengths L of mould A increases in the 1-50mm scope gradually, and the podium level H of mould B increases in the 0.2-20mm scope gradually.
Described single crystal super alloy stray crystal forms tendentious assessment method, and the land lengths of mould A is 3-26mm, podium level 5mm; The land lengths 15mm of mould B, podium level 0.5-14mm.
Described single crystal super alloy stray crystal forms tendentious assessment method, and along the direction of solidifying from bottom to top, the land lengths L of mould A increases in the 3-26mm scope gradually, and the podium level H of mould B increases in the 0.5-14mm scope gradually.
Described single crystal super alloy stray crystal forms tendentious assessment method, is nickel-base high-temperature single crystal alloy by evaluating material.
Described single crystal super alloy stray crystal forms tendentious assessment method, and mould A is used to estimate the influence that land lengths L forms stray crystal; Mould B is used to estimate the influence that podium level H forms stray crystal.
The invention has the beneficial effects as follows:
1. the present invention's stray crystal when solidifying that cross-sectional area is undergone mutation on direction theory of being easy to form, design has the mould A of different platform length and the mould B of different platform height, according to this two kinds of die casting multiple single crystal super alloy foundry goods A and B.Foundry goods A forms tendentiousness through the stray crystal of the land lengths quantitative evaluation single crystal super alloy that stray crystal forms; Foundry goods B carries out quantitative evaluation through the podium level that stray crystal forms to single crystal alloy.The evaluation result of this method can be used as the foundation that alloy is selected.
2. the present invention designs two kinds of mould A and B: the podium level H of mould A is constant, and land lengths L increases progressively, and is used for the influence that the research platform length L forms stray crystal; The land lengths L of mould B is constant, and podium level H successively decreases, and is used for the influence that the research platform height H forms stray crystal.
3. single crystal casting A of the present invention and B are simple in structure, are easy to casting, and the stray crystal of quantitative evaluation single crystal super alloy forms tendentiousness fast and accurately.Thereby this method cost is low, is beneficial to and applies.
Description of drawings:
Fig. 1 (a)-(b) is the macro morphology figure of foundry goods A and foundry goods B.Wherein, Fig. 1 (a) is foundry goods A; Fig. 1 (b) is foundry goods B.Among the figure, 1 blade; 2 platforms; L: land lengths; H: podium level.
Fig. 2 is inboard platform and the figure of outside platform cross section tissue of foundry goods A.
Fig. 3 is inboard platform and the figure of outside platform cross section tissue of foundry goods B.
Fig. 4 (a)-(b) is the influence curve of alloying component to stray crystal.Wherein, Fig. 4 (a) is the minimum land lengths L that alloying component occurs stray crystal
MinInfluence; Fig. 4 (b) is the maximum podium level H that alloying component occurs stray crystal
MaxInfluence.
Embodiment:
The theory that stray crystal forms when surpassing critical forming core degree of supercooling according to the degree of supercooling of platform edge; Design two kinds of symmetrical mold A and B with different platform length and height; Longer or the strong more rule of the more little stray crystal formation tendentiousness of podium level through land lengths, the quantitative assessment stray crystal forms tendentiousness.
Mould A has different platforms length and constant podium level, and along the direction of solidifying from bottom to top, land lengths L increases in the 1-50mm scope gradually; Mould B has constant land lengths and different platforms height, and along the direction of solidifying from bottom to top, podium level H increases in the 0.2-20mm scope gradually.
Single crystal super alloy stray crystal of the present invention forms tendentious assessment method, and concrete steps are following:
1. mould design
The identical point of mould A and B: the blade symmetria bilateralis of mould A and mould B is provided with platform, and blade (long * wide: 10mm * 10mm); Berm width (10mm); Adjacent platform spacing (16mm).
The difference of mould A and B: the land lengths L=1-50mm of mould A, podium level H constant (1-10mm); The land lengths L of mould B constant (10-30mm), podium level H=0.2-20mm.
The purposes of mould A and B: mould A is used to estimate the influence that land lengths L forms stray crystal; Mould B is used to estimate the influence that podium level H forms stray crystal.
2. cere module preparation
Use mould compacting wax-pattern A and B, two wax-pattern A and two wax-pattern B are assembled into the cere module by radial (along circumference) disposing way and running gate system bonding.Be called outside platform away from the platform at module center, be called inboard platform near the platform at module center.
3. ceramic shell mould preparation
Adopt the prepared formwork of traditional fabrication ceramic shell mould, then formwork is put into muffle furnace and be heated to 900-1100 ℃, be incubated the qualified ceramic shell mould of acquisition after 1-3 hour.
4. alloy cast
Under identical curing condition, pour into a mould different high temperature alloys, the single crystal casting A and the B of casting different-alloy.
5. stray crystal is observed
Single crystal casting A and B are carried out macro etch, observe the platform size that stray crystal occurs.Come the stray crystal of quantitative test alloy to form tendentiousness through the platform size that contrasts different single crystal super alloy stray crystals appearance.
Embodiment
Single crystal casting A and B according to the die casting that is designed are corresponding with mould A and B respectively, and its macro morphology is as shown in Figure 1, and blade 1 symmetria bilateralis of foundry goods A and foundry goods B is provided with platform 2.The height H of the platform 2 of foundry goods A is constant to be 5mm, and along the direction of solidifying from bottom to top, land lengths L increases in the 3-26mm scope gradually; The length L of the platform 2 of foundry goods B is constant to be 15mm, and along the direction of solidifying from bottom to top, podium level H increases in the 0.5-14mm scope gradually.
With the DD5 nickel-base high-temperature single crystal alloy is example, introduces land lengths L and height H form ability to stray crystal influence.Fig. 2 is inboard and the outside platform cross section tissue of foundry goods A.When land lengths L was increased to 14mm, the edge of outside platform began to occur stray crystal forming core and this stray crystal and grows up that to get into platform inner, and stray crystal do not occur in the inboard platform this moment; When land lengths L was increased to 20mm, the stray crystal area in the platform of the outside obviously increased, and begin occur stray crystal in the inboard platform this moment.Fig. 3 is inboard and the outside platform cross section tissue of foundry goods B.When podium level H is reduced to 7mm, begins to occur stray crystal in the platform of the outside, and stray crystal do not occur in the inboard platform.When podium level H is reduced to 3mm, begin to occur stray crystal in the inboard platform, the interior stray crystal area of outside platform this moment obviously increases.
Three kinds of minimum land lengths L that the nickel-base high-temperature single crystal alloy composition occurs stray crystal
MinInfluence shown in Fig. 4 (a).L
MinIt is strong more that the more for a short time stray crystal that shows alloy forms ability.Thereby the outside platform stray crystal occurs more easily than inboard platform, and stray crystal platform is identical with the tendentiousness that inboard platform forms: DD90＞DD5 in the outside SRR99.
Three kinds of maximum podium level H that the nickel-base high-temperature single crystal alloy composition occurs stray crystal
MaxInfluence shown in Fig. 4 (b).H
MaxThe stray crystal formation ability that shows alloy more greatly is strong more.Thereby the outside platform stray crystal occurs more easily than inboard platform, and stray crystal platform is identical with the tendentiousness that inboard platform forms: DD90＞DD5 in the outside SRR99.
The experimental result of Fig. 4 (a) and (b) shows: it is consistent that land lengths L and platform height H form tendentious judge conclusion to stray crystal, and therefore to form tendentiousness all be feasible to the stray crystal of the foundry goods quantitative evaluation single crystal super alloy through having different platform length L or podium level H.
Therefore, the present invention has the mould A of different platform length and the mould B of different platform height through design, and according to the single crystal casting A and the B of these two kinds of multiple alloys of die casting.Form ability through the land lengths of stray crystal formation among analysis foundry goods A and the B and the stray crystal of height quantitative evaluation alloy, the minimum land lengths of stray crystal formation maximum podium level more little or stray crystal formation is high more to show that the stray crystal formation tendentiousness of alloy is strong more.Thereby, can quantitative assessment the stray crystal of different single crystal super alloys form ability, for selecting stray crystal to form the more weak single crystal super alloy of tendentiousness in the actual production foundation is provided.
Claims (7)
1. a single crystal super alloy stray crystal forms tendentious assessment method; It is characterized in that: the theory that stray crystal forms when surpassing critical forming core degree of supercooling according to the degree of supercooling of platform edge; Design two kinds of symmetrical mold A and B with different platform length and height; Longer or the strong more rule of the more little stray crystal formation tendentiousness of podium level through land lengths, the quantitative assessment stray crystal forms tendentiousness.
2. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 1, it is characterized in that, mould A has different platforms length and constant podium level: land lengths is 1-50mm, and podium level is 1-10mm; Mould B has constant land lengths and different platforms height: land lengths is 10-30mm, and podium level is 0.2-20mm.
3. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 2; It is characterized in that: along the direction of solidifying from bottom to top; The land lengths L of mould A increases in the 1-50mm scope gradually, and the podium level H of mould B increases in the 0.2-20mm scope gradually.
4. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 1, it is characterized in that: the land lengths of mould A is 3-26mm, podium level 5mm; The land lengths 15mm of mould B, podium level 0.5-14mm.
5. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 4; It is characterized in that: along the direction of solidifying from bottom to top; The land lengths L of mould A increases in the 3-26mm scope gradually, and the podium level H of mould B increases in the 0.5-14mm scope gradually.
6. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 1, it is characterized in that: by evaluating material is nickel-base high-temperature single crystal alloy.
7. form tendentious assessment method according to the described single crystal super alloy stray crystal of claim 1, it is characterized in that: mould A is used to estimate the influence that land lengths L forms stray crystal; Mould B is used to estimate the influence that podium level H forms stray crystal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210138597.7A CN102706920B (en) | 2012-05-04 | 2012-05-04 | Method for evaluating mixed crystal formation tendency of single-crystal high-temperature alloys |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691882A (en) * | 2013-12-17 | 2014-04-02 | 上海交通大学 | Complicated thin-walled investment casting and method for evaluating casting performance of nickel-based alloy |
| CN109648065A (en) * | 2019-02-01 | 2019-04-19 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy recrystallization formability |
| CN109724556A (en) * | 2017-10-27 | 2019-05-07 | 中国科学院金属研究所 | The recrystallization tendentiousness evaluation method of nickel-base high-temperature single crystal alloy hot investment casting process |
| CN110487788A (en) * | 2019-07-12 | 2019-11-22 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy low-angle boundary formability |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102029A (en) * | 1983-12-27 | 1987-01-17 | 联合工艺公司 | Forgeability in nickel superalloys improves |
| US5649280A (en) * | 1996-01-02 | 1997-07-15 | General Electric Company | Method for controlling grain size in Ni-base superalloys |
| WO2005060631A2 (en) * | 2003-12-11 | 2005-07-07 | Ohio University | Titanium alloy microstructural refinement method and high temperature, high strain rate superplastic forming of titanium alloys |
-
2012
- 2012-05-04 CN CN201210138597.7A patent/CN102706920B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102029A (en) * | 1983-12-27 | 1987-01-17 | 联合工艺公司 | Forgeability in nickel superalloys improves |
| US5649280A (en) * | 1996-01-02 | 1997-07-15 | General Electric Company | Method for controlling grain size in Ni-base superalloys |
| WO2005060631A2 (en) * | 2003-12-11 | 2005-07-07 | Ohio University | Titanium alloy microstructural refinement method and high temperature, high strain rate superplastic forming of titanium alloys |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691882A (en) * | 2013-12-17 | 2014-04-02 | 上海交通大学 | Complicated thin-walled investment casting and method for evaluating casting performance of nickel-based alloy |
| CN103691882B (en) * | 2013-12-17 | 2015-07-08 | 上海交通大学 | Complicated thin-walled investment casting and method for evaluating casting performance of nickel-based alloy |
| CN109724556A (en) * | 2017-10-27 | 2019-05-07 | 中国科学院金属研究所 | The recrystallization tendentiousness evaluation method of nickel-base high-temperature single crystal alloy hot investment casting process |
| CN109724556B (en) * | 2017-10-27 | 2020-08-21 | 中国科学院金属研究所 | Method for evaluating recrystallization tendency in precision casting process of nickel-based single crystal superalloy |
| CN109648065A (en) * | 2019-02-01 | 2019-04-19 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy recrystallization formability |
| CN109648065B (en) * | 2019-02-01 | 2020-08-21 | 中国科学院金属研究所 | Method for evaluating recrystallization forming tendency of single crystal superalloy |
| CN110487788A (en) * | 2019-07-12 | 2019-11-22 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy low-angle boundary formability |
| CN110487788B (en) * | 2019-07-12 | 2021-08-20 | 中国科学院金属研究所 | Method for evaluating small-angle grain boundary forming tendency of single crystal superalloy |
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| CN102706920B (en) | 2014-03-26 |
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Effective date of registration: 20210811 Address after: 110172 block C12, south of Shendong Sixth Road, west of Zhongxing Street, Shenfu new area, Shenyang City, Liaoning Province Patentee after: Liaoning Hongyin Metal Co.,Ltd. Address before: 110016 No. 72, Wenhua Road, Shenhe District, Liaoning, Shenyang Patentee before: INSTITUTE OF METAL RESEARCH CHINESE ACADEMY OF SCIENCES |
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Denomination of invention: Evaluation method of heterocrystalline formation tendency of single crystal superalloys Effective date of registration: 20220225 Granted publication date: 20140326 Pledgee: Fushun Bank Co.,Ltd. Development Zone sub branch Pledgor: Liaoning Hongyin Metal Co.,Ltd. Registration number: Y2022210000012 |
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