CN103451656A - Chemical milling method of K423A cast superalloy without intergranular corrosion - Google Patents
Chemical milling method of K423A cast superalloy without intergranular corrosion Download PDFInfo
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- CN103451656A CN103451656A CN2013103876060A CN201310387606A CN103451656A CN 103451656 A CN103451656 A CN 103451656A CN 2013103876060 A CN2013103876060 A CN 2013103876060A CN 201310387606 A CN201310387606 A CN 201310387606A CN 103451656 A CN103451656 A CN 103451656A
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Abstract
The invention provides a chemical milling method of K423A cast superalloy without intergranular corrosion. The chemical milling method is characterized in that a composite addition agent is added to a chemical milling working fluid, so that after being subjected to chemical milling machining, the K423A alloy has a smooth and sound surface without intergranular corrosion. The chemical milling method comprises the following steps of (1) removing oil by using ultrasonic waves; (2) activating; (3) carrying out chemical milling machining; and (4) carrying out aftertreatment. The chemical milling method has the advantage that after the K423A alloy is subjected to chemical milling machining, the metal surface with small surface roughness, good surface evenness and accurate size and without allowance and intergranular corrosion can be obtained.
Description
Technical field
The present invention relates to a kind of chemistry milling method, relate in particular to the chemistry milling method of a kind of K423A cast superalloy without intergranular corrosion.
Background technology
The K423A superalloy is the nickel-base cast superalloy that China develops voluntarily, there are the characteristics such as intensity is high and anti-oxidant, anti-fatigue performance is good, tissue is stable, is applicable to be produced on hollow (or solid) turning vane of gas turbine or the block cast guider that use below 1000 ℃.Adopt milling processing can remove the unnecessary material of turning vane or block cast guider specific region, remove to greatest extent part useless heavy, alleviate the oeverall quality of aircraft and guarantee the precision of accessory size, expose and eliminate the mo(u)lded piece cosmetic bug.Yet, the K423A alloy in strong acidic environment during milling Susceptibility To Intergranular Corrosion very high, there will be intergranular corrosion in conventional nickel base superalloy milling corrosive fluid carries out the process of milling processing, had a strong impact on high temperature tensile strength, creep strength and the creep rupture strength of K423A alloy.
Add combined additive and eliminate K423A superalloy milling processing intergranular corrosion in the milling corrosive fluid, make corrosion more even.The present invention utilizes combined additive to make crystal boundary suitable with the crystal grain dissolution rate, thereby eliminates intergranular corrosion, obtains the metallic surface that surfaceness is little, surface finish good, occur without intergranular corrosion.The K423A superalloy has well overcome the technical barrier of precision casting and mechanical workout without intergranular corrosion milling processing as a kind of special working method.
Summary of the invention
The object of the present invention is to provide the chemistry milling method of a kind of K423A cast superalloy without intergranular corrosion, adopt the method can access that surfaceness is little, surface finish good, size is accurate, without surplus, without the metallic surface of intergranular corrosion.
The present invention is achieved in that its method steps is:
(1) ultrasonic wave oil removing: Sodium dodecylbenzene sulfonate 8～10 g/L, sodium lauryl sulphate 2～4g/L, alcohol 40ml/L are mixed with degreasing fluid, temperature 50 C, vibration of ultrasonic wave power: 1.2kw, each 10min of vibration of ultrasonic wave time, this degreasing fluid is removed to the test piece surface and oil contaminant, till eliminating.After oil removing, test piece is thoroughly cleaned through water, then carries out surperficial moisture film continuity check, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.By after 9.7mol/L hydrochloric acid and the mixing of 16.8mol/L hydrofluoric acid, room temperature, erosion time 120～150 s, carry out milling processing immediately after activation;
(3) milling processing: 40% hydrofluoric acid 250～350ml/L, Fe(NO3)39H2O 200～250g/L, 85% phosphoric acid 200～300ml/L, straight alkylbenzene sulfonate 1～3 g/L, thiocyanate-1～3 g/L are mixed with the milling working fluid, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then by K423A alloy vertical hanging in this milling working fluid.
(4) aftertreatment: after milling processing, sample moves to immediately in hot water and soaks 3～5min, and cold water flush 2 times, dry up.
Advantage of the present invention is: can access surfaceness by milling processing after adding combined additive at chemical milling solution little, surface finish is good, and size is accurate, without surplus, and the K423A alloy surface particularly occurred without intergranular corrosion.Intergranular corrosion detects to be carried out with reference to the requirement of ASTM G28 A standard code.Observe under 350 times, KH-7700 3 D video microscope on crystal boundary and separate out mutually without harmful according to the K423A alloy after milling of the present invention, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact.
Embodiment
Embodiment mono-: (1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C
18h
29naO
3s) 8 g/L
Sodium lauryl sulphate (C
12h
25sO
4na) 2g/L
Alcohol (C
2h
5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 60 ± 2 ℃ of 40% hydrofluoric acid 250ml/L, Fe(NO3)39H2O 200g/L, 85% phosphoric acid 200ml/L, straight alkylbenzene sulfonate 1 g/L, thiocyanate-1 g/L temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.3 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 313 μ m, milling speed 3.13 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment bis-: (1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C
18h
29naO
3s) 10 g/L
Sodium lauryl sulphate (C
12h
25sO
4na) 4g/L
Alcohol (C
2h
5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 350ml/L, Fe(NO3)39H2O 250g/L, 85% phosphoric acid 300ml/L, straight alkylbenzene sulfonate 3 g/L, thiocyanate-3 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.048 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 280 μ m, milling speed 2.80 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment tri-:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C
18h
29naO
3s) 9 g/L
Sodium lauryl sulphate (C
12h
25sO
4na) 3g/L
Alcohol (C
2h
5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 135s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 300ml/L, Fe(NO3)39H2O 210g/L, 85% phosphoric acid 230ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.397 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 346 μ m, milling speed 3.46 μ m/min, surface finish is 20 μ m, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment tetra-:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C
18h
29naO
3s) 8 g/L
Sodium lauryl sulphate (C
12h
25sO
4na) 4g/L
Alcohol (C
2h
5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 120s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 310ml/L, Fe(NO3)39H2O 220g/L, 85% phosphoric acid 260ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.212 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 243 μ m, milling speed 2.43 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Embodiment five:
(1) ultrasonic wave oil removing: the ultrasonic wave of removing the test piece surface and oil contaminant is removed oil formula:
Sodium dodecylbenzene sulfonate (C
18h
29naO
3s) 10 g/L
Sodium lauryl sulphate (C
12h
25sO
4na) 2g/L
Alcohol (C
2h
5oH) 40ml/L
Temperature 50 C
Vibration of ultrasonic wave power: 1.2kw
Till the vibration of ultrasonic wave time eliminates
The part oil removing is thoroughly cleaned by water, then carries out the continuity check of piece surface moisture film, if whole piece surface is hydrophilic, without the globule with do not infiltrate place, thinks that oil removing is qualified;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface.The parameter of activating process is, hydrochloric acid 9.7mol/L, and hydrofluoric acid 16.8mol/L, room temperature, erosion time 150s, carry out milling processing immediately after activation;
(3) milling processing: the parameter of milling complete processing is, 40% hydrofluoric acid 300ml/L, Fe(NO3)39H2O 240g/L, 85% phosphoric acid 280ml/L, straight alkylbenzene sulfonate 2 g/L, thiocyanate-2 g/L, then overturn K423A alloy vertical hanging 100 min(in this milling working fluid once in every 20 minutes).
(4) aftertreatment: after milling processing, sample is transferred to hot-water soak 3～5min immediately, and cold water flush 2 times, dry up, and guarantees that alloy surface is residual without the milling working fluid, affects the alloy surface quality.
Adopting the JB-6C surface coarseness profiling instrument to record the alloy sample surface roughness Ra is 1.170 μ m, the 35DL ultrasonic thickness indicator records the chemistry milling degree of depth 440 μ m, milling speed 4.40 μ m/min, observe on crystal boundary and separate out mutually without harmful under 350 times, KH-7700 3 D video microscope with reference to the requirement of ASTM G28 A method standard code, and to measure the intergranular corrosion degree of depth be 0 μ m, surfacing is intact, meets processing request.
Claims (1)
1. a K423A cast superalloy, without the chemistry milling method of intergranular corrosion, is characterized in that method steps is:
(1) ultrasonic wave oil removing: Sodium dodecylbenzene sulfonate 8～10 g/L, sodium lauryl sulphate 2～4g/L, alcohol 40ml/L are mixed with degreasing fluid, temperature 50 C, vibration of ultrasonic wave power: 1.2kw, each 10min of vibration of ultrasonic wave time, this degreasing fluid is removed to the test piece surface and oil contaminant, and after oil removing, test piece is cleaned through water, then carries out surperficial moisture film continuity check, until whole piece surface is hydrophilic, without the globule with do not infiltrate place;
(2) activation: remove the oxide film that the K423A high-temperature alloy surface forms, make surface in active state, for milling processing provides good surface, by after 9.7mol/L hydrochloric acid and the mixing of 16.8mol/L hydrofluoric acid, room temperature, erosion time 120～150 s, carry out milling processing immediately after activation;
(3) milling processing: 40% hydrofluoric acid 250～350ml/L, Fe(NO3)39H2O 200～250g/L, 85% phosphoric acid 200～300ml/L, straight alkylbenzene sulfonate 1～3 g/L, thiocyanate-1～3 g/L, be mixed with the milling working fluid, 60 ± 2 ℃ of temperature, stirring velocity 160～200r/min, then by K423A alloy vertical hanging in this milling working fluid;
(4) aftertreatment: after milling processing, sample moves to immediately in hot water and soaks 3～5min, and cold water flush 2 times, dry up.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746077A (en) * | 2015-03-12 | 2015-07-01 | 南昌航空大学 | Precise chemical milling method for Ti2AlNb alloy |
| 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 |
| CN108385108A (en) * | 2018-04-19 | 2018-08-10 | 东北大学 | A kind of single crystal super alloy precision castings milling cream and its preparation method and application |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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2013
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Non-Patent Citations (3)
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| 付明等: "化学铣切工艺在15-5PH精密机械零件加工中的研究与应用", 《航空兵器》 * |
| 李怀章: "用于磷酸和硝酸的腐蚀抑制剂", 《陕西化工》 * |
| 袁亮: "GH4169高温合金腐蚀加工及其对基体性能影响研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746077A (en) * | 2015-03-12 | 2015-07-01 | 南昌航空大学 | Precise chemical milling method for Ti2AlNb alloy |
| 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 |
| CN108385108A (en) * | 2018-04-19 | 2018-08-10 | 东北大学 | A kind of single crystal super alloy precision castings milling cream and its preparation method and application |
| CN108385108B (en) * | 2018-04-19 | 2019-06-11 | 东北大学 | A kind of single crystal super alloy precision castings milling cream and its preparation method and application |
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Application publication date: 20131218 |