CN103451657A - Chemical milling method for monocrystalline high temperature alloy precision casting - Google Patents
Chemical milling method for monocrystalline high temperature alloy precision casting Download PDFInfo
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- CN103451657A CN103451657A CN2012101787941A CN201210178794A CN103451657A CN 103451657 A CN103451657 A CN 103451657A CN 2012101787941 A CN2012101787941 A CN 2012101787941A CN 201210178794 A CN201210178794 A CN 201210178794A CN 103451657 A CN103451657 A CN 103451657A
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Abstract
The invention relates to a chemical milling method for monocrystalline high temperature alloy precision casting. The method is as below: first cleaning impurities on the surface of the precision casting; then putting a corrosion liquid and a precision casting in a corrosion groove, putting in a test piece with known thickness, immersing the precision casting and the test piece in the corrosion liquid, heating the corrosion groove from outside to maintain the temperature of the corrosion liquid at 20-60 DEG C, corroding for 90-200 min to shed off the corrosion products; taking out the precision casting and the test piece from the corrosion groove, flushing the precision casting and the test piece with clear water, brushing off residual corrosion products, air-drying the precision casting and the test piece, measuring thickness change of the test piece and determining the removal amount of the casting; and if the removal amount is not enough, repeating the above steps until a required removal amount is reached. The method provided by the invention is mainly suitable for chemical milling of Re-containing nickel base monocrystalline high temperature alloy. The chemical milling method is mainly used for removal of local stress concentration on the surface layer of the casting in a casting technology, and can effectively alleviate defect of recrystallization in a subsequent heat treatment process.
Description
Technical field
The invention belongs to the superalloy technical field, be specifically related to a kind of chemical milling method of single crystal super alloy precision castings.
Background technology
In order to meet thrust-weight ratio that aircraft engine improves day by day and the requirement of energy-conserving and environment-protective, topmostly in engine hold warm parts superalloy and develop directionally solidified alloy and single crystal alloy from polycrystalline.Single crystal alloy is owing to having removed the crystal boundary weakened under high temperature, and performance is largely increased.In order to obtain more excellent performance, single crystal super alloy experienced from the first-generation without the Re alloy to the s-generation containing the 3%Re alloy, be developed to the third generation and add the alloy of Ru containing the alloy of 6%Re and the 4th generation of recent development on high Re basis.Re adds the obvious high-temperature behavior that increases superalloy.But, in the single crystal preparation process, the crystal grain defects such as recrystallize will cause the remarkable reduction of performance.
By milling, can significantly reduce the unrelieved stress on top layer, reduce the generation of recrystallize.Through the Searches of Patent Literature, find no the Patents technology of nickel-base high-temperature single crystal alloy blade chemical milling method.But proposed the method for a kind of blade finish forge milling in patent CN101696501, adopted hydrochloric acid, the nitric acid of 100-135/L and the ferric chloride aqueous solutions of 400-500/L of 55-75/L, this etching reagent also can carry out the milling of first-generation single crystal super alloy.But can not adopt the method to containing the Re alloy-steel casting, carrying out milling.
Summary of the invention
The chemical milling method that the purpose of this invention is to provide a kind of single crystal super alloy precision castings, this chemical milling method is mainly used in to be removed in casting technique in the stress raisers on foundry goods top layer, can effectively reduce recrystallization defect in follow-up heat treatment process.
The invention provides a kind of chemical milling method of single crystal super alloy precision castings, the method key step is as follows:
(1) cleaning precision castings surface impurity;
(2) corrosive fluid and precision castings are put into to etching tank, put into the test test piece of known thickness simultaneously, make precision castings and test piece all immerse in corrosive fluid, and in etching tank external application water-bath or constant temperature oven heating, make the corrosive fluid temperature at 20-60 ℃, after corrosion 90-200min, visible significantly corrosion product comes off;
(3) precision castings and test piece are taken out from etching tank, rinse with clear water, and brush away residual corrosion product, dry after cleaning, measure the variation in thickness of test piece, determine the removal amount of foundry goods;
(4) repeat again above step (2)-(3) as the removal amount deficiency, until reach required removal amount.
The chemical milling method of single crystal super alloy precision castings provided by the invention, the proportioning of described corrosive fluid is: nitric acid: 200-400ml, hydrofluoric acid: 150-350ml, distilled water: 350-700ml.Corrosion temperature is 20-60 ℃; Etching time is 90-200min.
The chemical milling method of single crystal super alloy precision castings provided by the invention is applied to the nickel-base high-temperature single crystal alloy containing Re.
The present invention has following advantage:
1, the present invention has simple to operate, manageable characteristics.
2, the present invention can remove the unrelieved stress layer on single crystal super alloy top layer, reduces the recrystallization defect due to being out of shape, and increases the yield rate of single crystal super alloy precision castings.
3, the present invention can show the grain structure of single crystal alloy simultaneously.
Embodiment
Following examples will be further described the present invention, but not thereby limiting the invention.
Embodiment 1
Weighing 500ml distilled water, 220ml hydrofluoric acid, 240ml nitric acid, the preparation corrosive fluid, mix.
The DD5 of one group of as cast condition essence casting blade and the monocrystalline test piece for preparing with technique are put into to etching tank simultaneously, then corrosive fluid is poured in etching tank, guarantee corrosive fluid submergence foundry goods, etching tank carries out heating in water bath outward, and measures the corrosive fluid temperature between 20-60 ℃.About 100min of milling time.Remove surperficial residue after rinsing with clear water again.Reduce altogether 0.1mm with the thickness of miking test piece, under this condition, the precision castings surface divide out except 0.05mm thick.
Embodiment 2
Weighing 600ml distilled water, 300ml hydrofluoric acid, 200ml nitric acid, the preparation corrosive fluid, mix.
One group of heat treated DD5 precision castings is put into to etching tank, then corrosive fluid is poured in etching tank, make corrosive fluid submergence foundry goods, heated with the temperature controllable electric furnace under etching tank, keep the corrosive fluid temperature between 20-60 ℃.About 150min of milling time.Rinse and remove corrosion product with clear water again.The corrosion of visual observation cast(ing) surface evenly.The thickness of measuring test piece has reduced 0.12mm, and divide out except 0.06mm in the surface of foundry goods.
Embodiment 3:
Surface is carried out to the milling processing through one group of DD32 single crystal super alloy test piece of sandblasting by embodiment 1, then carry out solution treatment, will not have the test piece of milling also to carry out solution treatment simultaneously and compare.The structure observation in cross section shows, there is not the approximately recrystallized layer of 30 μ m of a layer thickness in the test piece surface of milling, through the test piece of milling, does not observe recrystallized layer.
Claims (4)
1. the chemical milling method of a single crystal super alloy precision castings, it is characterized in that: the method key step is as follows:
(1) cleaning precision castings surface impurity;
(2) corrosive fluid and precision castings are put into to etching tank, put into the test test piece of known thickness simultaneously, precision castings and test piece are all immersed in corrosive fluid, and, at the etching tank external heat, make the corrosive fluid temperature at 20-60 ℃, after corrosion 90-200min, corrosion product comes off;
(3) precision castings and test piece are taken out from etching tank, rinse with clear water, and brush away residual corrosion product, dry after cleaning, measure the variation in thickness of test piece, determine the removal amount of foundry goods;
(4) repeat again above step (2)-(3) as the removal amount deficiency, until reach required removal amount.
2. according to the chemical milling method of the described single crystal super alloy precision castings of claim 1, it is characterized in that: the proportioning of described corrosive fluid is: nitric acid: 200-400ml, hydrofluoric acid: 150-350ml, distilled water: 350-700ml.
3. according to the chemical milling method of the described single crystal super alloy precision castings of claim 1, it is characterized in that: the mode of described etching tank external heat is water-bath or constant temperature oven heating.
4. the chemical milling method of the described single crystal super alloy precision castings of claim 1 is applied to the nickel-base high-temperature single crystal alloy containing Re.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101787941A CN103451657A (en) | 2012-06-01 | 2012-06-01 | Chemical milling method for monocrystalline high temperature alloy precision casting |
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| CN2012101787941A CN103451657A (en) | 2012-06-01 | 2012-06-01 | Chemical milling method for monocrystalline high temperature alloy precision casting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018933A (en) * | 2014-04-21 | 2015-11-04 | 中国科学院金属研究所 | Macrograin corrosion method for monocrystal high-temperature alloy casting containing Re and/or Ru |
| CN105442033A (en) * | 2015-12-12 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Corrosive agent for displaying steam line under high-temperature alloy heading state and corrosion test method |
| CN105543947A (en) * | 2015-12-12 | 2016-05-04 | 中国航空工业标准件制造有限责任公司 | Corrosive for flow line displaying under heading state of high-temperature alloy and corrosion testing method |
| CN105803533A (en) * | 2016-05-03 | 2016-07-27 | 中国航空工业集团公司北京航空材料研究院 | Method for removing recrystallization of monocrystal high-temperature alloy turbine blade |
| CN107641807A (en) * | 2017-09-25 | 2018-01-30 | 南昌航空大学 | A kind of method of suitable nickel-base casting alloy chemical attack processing |
| CN113622032A (en) * | 2021-08-25 | 2021-11-09 | 中国航发沈阳黎明航空发动机有限责任公司 | Process method for controlling fluorescent display of single crystal blade |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696501A (en) * | 2009-10-29 | 2010-04-21 | 西安航空动力股份有限公司 | Precision-forging chemical-milling solution for high-temperature alloy blades and chemical milling method |
| CN101709471A (en) * | 2009-12-16 | 2010-05-19 | 沈阳黎明航空发动机(集团)有限责任公司 | Chemical milling method for titanium alloy blades |
| CN102330087A (en) * | 2011-09-23 | 2012-01-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for removing strained layer on surface of single crystal blade casting through chemical milling |
-
2012
- 2012-06-01 CN CN2012101787941A patent/CN103451657A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696501A (en) * | 2009-10-29 | 2010-04-21 | 西安航空动力股份有限公司 | Precision-forging chemical-milling solution for high-temperature alloy blades and chemical milling method |
| CN101709471A (en) * | 2009-12-16 | 2010-05-19 | 沈阳黎明航空发动机(集团)有限责任公司 | Chemical milling method for titanium alloy blades |
| CN102330087A (en) * | 2011-09-23 | 2012-01-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for removing strained layer on surface of single crystal blade casting through chemical milling |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018933A (en) * | 2014-04-21 | 2015-11-04 | 中国科学院金属研究所 | Macrograin corrosion method for monocrystal high-temperature alloy casting containing Re and/or Ru |
| CN105018933B (en) * | 2014-04-21 | 2017-05-17 | 中国科学院金属研究所 | Macrograin corrosion method for monocrystal high-temperature alloy casting containing Re and/or Ru |
| CN105442033A (en) * | 2015-12-12 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Corrosive agent for displaying steam line under high-temperature alloy heading state and corrosion test method |
| CN105543947A (en) * | 2015-12-12 | 2016-05-04 | 中国航空工业标准件制造有限责任公司 | Corrosive for flow line displaying under heading state of high-temperature alloy and corrosion testing method |
| CN105803533A (en) * | 2016-05-03 | 2016-07-27 | 中国航空工业集团公司北京航空材料研究院 | Method for removing recrystallization of monocrystal high-temperature alloy turbine blade |
| CN105803533B (en) * | 2016-05-03 | 2018-06-29 | 中国航空工业集团公司北京航空材料研究院 | A kind of method for removing single crystal super alloy turbo blade recrystallization |
| CN107641807A (en) * | 2017-09-25 | 2018-01-30 | 南昌航空大学 | A kind of method of suitable nickel-base casting alloy chemical attack processing |
| CN113622032A (en) * | 2021-08-25 | 2021-11-09 | 中国航发沈阳黎明航空发动机有限责任公司 | Process method for controlling fluorescent display of single crystal blade |
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