CN113894270A - Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting - Google Patents
Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting Download PDFInfo
- Publication number
- CN113894270A CN113894270A CN202111131514.7A CN202111131514A CN113894270A CN 113894270 A CN113894270 A CN 113894270A CN 202111131514 A CN202111131514 A CN 202111131514A CN 113894270 A CN113894270 A CN 113894270A
- Authority
- CN
- China
- Prior art keywords
- section
- blade
- crystal
- isometric
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8477—Investigating crystals, e.g. liquid crystals
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention relates to the technical field of high-temperature alloy precision investment casting, in particular to a prediction method of micro-porosity of a high-temperature alloy isometric crystal blade or a structural casting. The method comprises the steps of pouring the isometric crystal blade by adopting a polycrystalline casting furnace, performing primary cutting on the cast blade, reserving a certain margin for a tenon casting head, performing macroscopic crystal grain corrosion on the section of the tenon casting head, analyzing the solidification sequence and the feeding channel opening and closing state of the tenon in the solidification process of the isometric crystal blade by observing the section grain size, further obtaining whether the tenon of the isometric crystal blade and the whole blade body are fully fed in the solidification process, and predicting the micro-porosity condition of the isometric crystal blade. The method has the characteristics of simple operation and low cost, and is more suitable for predicting the micro-porosity of the equiaxial crystal blade in the production of the engineering blade. The invention can reduce the cost loss caused by the cast dissection and has guiding significance for solving the casting micro-porosity in the production of the engineering blade.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy precision investment casting, in particular to a prediction method of micro-porosity of a high-temperature alloy isometric crystal blade or a structural casting.
Background
In order to improve the performance and the use reliability of the high-temperature alloy blade and the structural casting, the detection and analysis of the micro-porosity of the casting are generally required. The micro-porosity detection needs to perform dissection sampling, sample grinding, metallographic microscope photographing and metallographic analysis on the blade and the structural part, and finally obtains the micro-porosity of the blade or the structural part. The method is a conventional scheme which is commonly adopted at present, has the characteristic of accurate measurement result, can only detect a single casting, and the cast after dissection can not be used. However, it is obviously impractical to dissect all castings in order to understand the microporosity of producing a batch of all castings and to improve the reliability of use of the batch of castings.
Disclosure of Invention
The invention aims to provide a method for predicting the micro-porosity of a high-temperature alloy isometric crystal blade or a structural type casting, which is mainly suitable for predicting the micro-porosity inside the high-temperature alloy investment precision casting isometric crystal blade and is also suitable for predicting the micro-porosity inside the high-temperature alloy investment precision casting structural type isometric crystal casting.
The technical scheme of the invention is as follows:
a prediction method for micro-porosity of a high-temperature alloy isometric crystal blade or a structural casting comprises the steps of pouring the isometric crystal blade by a polycrystalline casting furnace on the premise that a pouring system is solidified according to a sequence when the high-temperature alloy isometric crystal blade is prepared, primarily cutting the cast isometric crystal blade, reserving allowance for a tenon casting head, carrying out macroscopic grain corrosion on the cross section of the tenon casting head, analyzing the solidification sequence and the open-close state of a feeding channel of the isometric crystal blade at the tenon in the solidification process by observing the grain size of the cross section, further obtaining whether the tenon of the isometric crystal blade and the whole blade body are fully fed in the solidification process, and pre-judging the micro-porosity condition of the whole isometric crystal blade;
or in the process of preparing the high-temperature alloy isometric crystal blade, on the premise that a casting system is solidified according to the sequence, the isometric crystal blade is cast by adopting a polycrystalline casting furnace, the cast isometric crystal blade is cut, a certain section of the isometric crystal blade is cut, macroscopic crystal grain corrosion is carried out on the cut section, the solidification sequence and the open-close state of a feeding channel at the section of the isometric crystal blade in the solidification process are analyzed by observing the grain size of the section, so that whether the blade body below the cut section of the isometric crystal blade is fully fed in the solidification process is obtained, and the micro-porosity condition of the isometric crystal blade is pre-judged;
or when preparing the high-temperature alloy isometric crystal structure casting, on the premise that a casting system is solidified according to the sequence, adopting a polycrystal casting furnace to cast the isometric crystal casting, carrying out casting head primary cutting on the cast isometric crystal casting, reserving allowance for a casting head, carrying out macroscopic grain corrosion on the section of the casting head, analyzing the solidification sequence and the feeding channel opening and closing state of the casting head of the isometric crystal structure in the solidification process by observing the grain size of the section, further obtaining whether the isometric crystal structure can be fully fed in the solidification process, and thereby predicting the whole micro-porosity condition of the isometric crystal structure.
The method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting predicts the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting by observing the size and the shape of the cross-section crystal grains.
The prediction method for the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting has the advantages that no obvious thermal section exists below the cut and corroded section, the design of the whole pouring system is reasonable, and the process and the design meet the sequential solidification characteristic.
According to the prediction method of the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting, the length direction size of the isometric crystal blade is 35-500 mm, and the thickness size of the isometric crystal blade is 2-35 mm.
According to the prediction method of the micro-porosity of the high-temperature alloy isometric crystal blade or the structure casting, the length direction size of the isometric crystal structure casting is 35-500 mm, and the thickness size of the isometric crystal structure casting is 2-35 mm.
According to the prediction method for the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting, the outer part of the section is a rapidly solidified fine isometric crystal, the outer part of the section is a columnar crystal composition with directional growth, and the inner part of the section is a coarse isometric crystal.
According to the method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting, when the area of the cross section occupied by the columnar crystal is larger than 70%, the outer part of the cross section is fine isometric crystal, the grain size of the outer isometric crystal is smaller than 2mm, the columnar crystal growing from outside to inside in a directional mode is in a butt joint trend, the grain length of the columnar crystal is larger than 10mm, the columnar crystal occupies the whole cross section, and the coarse isometric crystal can not be seen in the inner part of the columnar crystal, namely the inner isometric crystal occupies less than 20% of the area of the cross section, so that the cross section is solidified too fast and a feeding channel is narrow, sufficient feeding cannot be achieved, an obvious micro-porosity defect exists, and the area percentage of the micro-porosity in the casting is larger than 1.5%.
According to the method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting, when the columnar crystal occupies 30-70% of the cross section area, the fine isometric crystal is arranged outside the cross section, the grain size of the outer isometric crystal is smaller than 2mm, the grain length of the cross section of the columnar crystal growing from outside to inside in a directional mode is 3-10 mm, the coarse isometric crystal with the grain size of more than 3mm is arranged inside the cross section, the inner isometric crystal occupies 20-60% of the cross section area, the solidification of the outer portion of the cross section is fast, the solidification of the inner portion is slow, the feeding channel is in an open state for a long time, the inner grain is early in nucleation, the larger grain can cause obstruction to feeding, the micro-porosity is good, and the area percentage of the micro-porosity is 0.7-1.5%.
According to the method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting, when the area of a cross section of a columnar crystal is less than 30%, the area of the cross section is isometric crystal, the grain size of the isometric crystal at the outer part is less than 2mm, the grain length of the columnar crystal directionally grown from outside to inside of the cross section is very small or even no columnar crystal is generated, namely the columnar crystal occupies less than 30% of the area of the cross section, the inner part of the cross section is coarse isometric crystal with the grain size of more than 2mm, the isometric crystal at the inner part occupies more than 60% of the area of the cross section, the outer part of the cross section is slowly solidified, a feeding channel is always in an open state, the nucleation of the crystal grain at the outer part of the cross section is late, the nucleation time is not long, the smaller crystal grain cannot cause great obstruction to feeding, the micro-porosity is good, and the area percentage of the micro-porosity is 0-0.7%.
The design idea of the invention is as follows:
according to the invention, through analysis of grain size corrosion and micro-porosity of a large number of castings, the grain size and distribution form of anatomical sections are found to be in certain correlation with the micro-porosity of the castings, and the method has a certain prediction effect on the micro-porosity of the castings. In order to predict the micro-porosity inside the mass-cast blades or structural members, the process optimization degree of the isometric crystal blades or structural members is improved at the same time.
The invention provides a brand-new prediction method for micro-porosity of a high-temperature alloy isometric crystal blade or a structural member, which analyzes the solidification sequence and the feeding channel opening and closing state of a tenon in the solidification process of the isometric crystal blade by observing section crystal grains so as to obtain whether the tenon and the whole blade body of the isometric crystal blade are fully fed in the solidification process, and predicts the micro-porosity condition of the isometric crystal blade.
The invention has the following advantages and beneficial effects:
1. the method is easy to control and low in cost, and can directly reflect the severity of the micro-porosity defect.
2. The method has the advantages of short operation period and high efficiency, and can predict the whole batch of castings.
3. The invention can shorten the process development period in the initial stage of casting development.
4. Under the condition of reasonable design of a pouring system, the invention can provide an improved direction for the casting process, so that the process is continuously optimized.
5. The method has the characteristics of simple operation and low cost, and is more suitable for predicting the micro-porosity of the equiaxial crystal blade in the production of the engineering blade.
6. The invention can reduce the cost loss caused by the cast dissection and has guiding significance for solving the casting micro-porosity in the production of the engineering blade.
7. The method is mainly suitable for predicting the internal micro-porosity of the high-temperature alloy investment precision casting isometric crystal blade, and is also suitable for predicting the internal micro-porosity of the high-temperature alloy investment precision casting structure type isometric crystal casting.
Drawings
Fig. 1 is a schematic structural view of an isometric crystal blade applicable to the present invention.
Fig. 2 shows several grain growth features involved in the present invention. In the figure, 1 is coarse equiaxed crystal, 2 is columnar crystal, and 3 is fine equiaxed crystal.
Detailed Description
In the specific implementation process, as shown in fig. 1 and 2, the prediction method of the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting comprises the following steps: taking a casting head of a blade or a structural casting to cut the section, adopting HCl + H2O2Or FeCl3And (3) performing macroscopic grain size corrosion on the cross section by using HCl corrosion solution until clear grains can be observed on the cross section of the casting head, wherein the outer part of the cross section is a rapidly solidified fine isometric crystal 3, the outer part of the cross section is a columnar crystal 2 growing directionally from outside to inside, and the inner part of the cross section is a coarse isometric crystal 1. Through observing the section grain size, the solidification sequence and the feeding channel opening and closing state of the tenon in the solidification process of the isometric crystal blade are analyzed, whether the tenon and the whole blade body of the isometric crystal blade are fully fed in the solidification process is further obtained, and the microscopic feeding of the isometric crystal blade is predicted according to the full feeding sequence and the full feeding stateA loose condition.
The present invention will be described in more detail below with reference to examples.
Example 1
The embodiment predicts the micro-porosity of the high-temperature alloy isometric crystal blade, the structure of the blade is similar to that of the blade shown in figure 1, the total length is 290mm, the maximum thickness of the tenon is 38mm, the root extending thickness is 26mm, the blade tip thickness is 5mm, the thickness is gradually increased to 14mm towards the blade root, and the sequential solidification requirement is met. The method of the invention is adopted to predict the internal micro-porosity condition of the blade, the blade tenon casting head is cut, and the crystal grain corrosion is carried out, wherein the appearance and distribution conditions of the crystal grains are as follows: the outside of the cross section is rapidly solidified fine isometric crystals, the grain size of the isometric crystals at the outside of the cross section is less than 2mm, the outside and the inside are directionally grown columnar crystals, the grain length of the columnar crystals is more than 10mm, the growth of the columnar crystals at two ends is almost in a butt joint trend, the existence of the thicker isometric crystals is hardly seen in the inside of the cross section, namely, the inside isometric crystals account for within 20 percent of the area of the cross section.
The distribution of the crystal grains on the section of the casting head is reflected, in the process of casting head solidification, a feeding channel is narrow, the casting head is in a directional solidification trend in the transverse direction, the solidification speed is high, no equiaxial crystal which is finally formed into nuclei freely and grows up exists in the casting head, namely, the section is almost composed of thick columnar crystals, the columnar crystals are obtained by surface nucleation rapid solidification and directional growth, and the columnar crystals account for more than 70 percent of the area of the section. The grain state shows that in the process of blade solidification, a casting head for feeding the blade is solidified too fast, a feeding channel is narrow, the blade cannot be fed fully, obvious micro-porosity defects possibly exist, and the micro-porosity area percentage of the blade is more than 1.5%.
The conventional micro-loosening detection is carried out on the leaf blade, the area percentage of the micro-loosening at the most serious part is 3.26%, the micro-loosening is serious, and the area percentage is the same as the prediction result.
Example 2
The embodiment predicts the micro-porosity of the high-temperature alloy isometric crystal blade, the structure of the blade is similar to that of the blade shown in figure 1, the total length is 165mm, the maximum thickness of the tenon is 25mm, the root extending thickness is 18mm, the blade tip thickness is 4mm, the thickness is gradually increased to 10mm towards the blade root, and the sequential solidification requirement is met. The method of the invention is adopted to predict the internal micro-porosity condition of the blade, the blade tenon casting head is cut, and the crystal grain corrosion is carried out, wherein the appearance and distribution conditions of the crystal grains are as follows: the outside of the section is a rapidly solidified fine equiaxed crystal, the grain size of the equiaxed crystal outside the section is less than 2mm, the grain length of the columnar crystal growing directionally from outside to inside is 3-5 mm, the inside is a thicker equiaxed crystal, and the grain size of the inner equiaxed crystal is more than 3 mm.
The distribution of the casting head section crystal grains is reflected, in the casting head solidification process, a feeding channel is better opened and closed, a larger feeding expansion angle is provided, and the size of an internal isometric crystal is larger, namely: the section of the crystal is provided with rapidly solidified and directionally grown columnar crystals, and the columnar crystals account for 30-70% of the area of the section; the interior of the cross section is coarse isometric crystals, and the isometric crystals in the cross section account for 20-60% of the area of the cross section; the outside of the cross section is fine equiaxed crystals, and the fine equiaxed crystals on the outside of the cross section account for 10% -20% of the area of the cross section. The grain state shows that in the blade solidification process, the surface of a casting head for feeding the blade is solidified faster, the inner part of the casting head is solidified more slowly, a feeding channel is in an open state for a longer time, the inner grains are nucleated earlier, and the larger grains can cause certain obstruction to the blade feeding. The combination of the above can predict that the micro-porosity of the leaf is better, and the area percentage of the micro-porosity of the leaf is between 0.7 and 1.5 percent.
The conventional micro-loosening detection is carried out on the leaf blade, the area percentage of the micro-loosening at the most serious position is 1.38%, the micro-loosening is good, and the area percentage is the same as the prediction result.
Example 3
The embodiment predicts the micro-porosity of the high-temperature alloy isometric crystal surface fine-grained blade, the structure of the blade is similar to that of the blade shown in figure 1, the total length is 70mm, the maximum thickness of the tenon is 10mm, the thickness of the extending root is 6mm, the thickness of the blade tip is 3mm, the blade root is gradually thickened to 5mm, and the sequential solidification requirement is met. The method of the invention is adopted to predict the internal micro-porosity condition of the blade, the blade tenon casting head is cut, and the crystal grain corrosion is carried out, wherein the appearance and distribution conditions of the crystal grains are as follows: the small isometric crystals generated by the action of the refiner are arranged outside the section, the grain size of the isometric crystals outside the section is smaller than 1mm, the relatively thick isometric crystals generated by nucleation and free nucleation under the action of the refiner are arranged inside the section, the grain size of the isometric crystals inside the section is 2-3 mm, and columnar crystals are hardly generated.
The distribution of the crystal grains on the cross section of the casting head reflects that in the process of casting head solidification, a feeding channel is well opened, a large feeding expansion angle is provided, columnar crystals which are rapidly solidified and directionally grown almost do not exist in the cross section, namely the columnar crystals occupy less than 10% of the area of the cross section, slightly thick isometric crystals are in the cross section, the more fine the internal isometric crystals are, the more beneficial the casting feeding is, and the more 85% of the area of the cross section is occupied by the isometric crystals in the cross section. The grain state shows that in the blade solidification process, the surface of a casting head for feeding the blade is solidified slowly, a feeding channel is always in an open state, the nucleation of internal grains is late, the nucleation growth time is short, and the smaller grains cannot cause great obstruction to the blade feeding. The comprehensive prediction shows that the micro-porosity of the blade is good, and the area percentage of the micro-porosity of the blade is 0-0.7%.
The leaf is subjected to conventional micro-loosening detection, the area percentage of the micro-loosening at the most serious part is 0.26%, the micro-loosening is good, and the detection result is the same as the prediction result.
The embodiment result shows that the method is mainly suitable for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting on the premise of meeting the sequential solidification. By observing the grain size of the cross section and analyzing whether the isometric crystal blade or the structural casting is fully fed or not in the solidification process, the micro-porosity condition of the isometric crystal blade or the structural casting can be effectively predicted.
Claims (9)
1. A prediction method for micro-porosity of a high-temperature alloy isometric crystal blade or a structural casting is characterized in that when the high-temperature alloy isometric crystal blade is prepared, on the premise that a pouring system is solidified according to a sequence, the isometric crystal blade is poured by a polycrystalline casting furnace, the cast isometric crystal blade is subjected to primary cutting, a tenon casting head is left with a margin, macroscopic crystal grain corrosion is carried out on the cross section of the tenon casting head, the solidification sequence and the open-close state of a feeding channel at the tenon in the solidification process of the isometric crystal blade are analyzed by observing the grain size of the cross section, whether the tenon of the isometric crystal blade and the whole blade body are fully fed in the solidification process is further obtained, and the micro-porosity condition of the whole isometric crystal blade is predicted according to the condition;
or in the process of preparing the high-temperature alloy isometric crystal blade, on the premise that a casting system is solidified according to the sequence, the isometric crystal blade is cast by adopting a polycrystalline casting furnace, the cast isometric crystal blade is cut, a certain section of the isometric crystal blade is cut, macroscopic crystal grain corrosion is carried out on the cut section, the solidification sequence and the open-close state of a feeding channel at the section of the isometric crystal blade in the solidification process are analyzed by observing the grain size of the section, so that whether the blade body below the cut section of the isometric crystal blade is fully fed in the solidification process is obtained, and the micro-porosity condition of the isometric crystal blade is pre-judged;
or when preparing the high-temperature alloy isometric crystal structure casting, on the premise that a casting system is solidified according to the sequence, adopting a polycrystal casting furnace to cast the isometric crystal casting, carrying out casting head primary cutting on the cast isometric crystal casting, reserving allowance for a casting head, carrying out macroscopic grain corrosion on the section of the casting head, analyzing the solidification sequence and the feeding channel opening and closing state of the casting head of the isometric crystal structure in the solidification process by observing the grain size of the section, further obtaining whether the isometric crystal structure can be fully fed in the solidification process, and thereby predicting the whole micro-porosity condition of the isometric crystal structure.
2. The method for predicting the microporosity of a superalloy isometric blade or structural casting as in claim 1, wherein the microporosity of a superalloy isometric blade or structural casting is predicted by observing cross-sectional grain size and morphology.
3. The method for predicting the micro-porosity of the superalloy isometric blade or the structural casting according to claim 1, wherein the cut and eroded section has no significant thermal junction below it, and the integral gating system is designed reasonably so that the process and design meet the sequential solidification characteristics.
4. The method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting according to claim 1, wherein the isometric crystal blade is 35-500 mm in length direction and 2-35 mm in thickness.
5. The method for predicting the microporosity of the superalloy isometric crystal blade or the structural casting according to claim 1, wherein the isometric crystal structural casting has a length dimension of 35-500 mm and a thickness dimension of 2-35 mm.
6. The method for predicting the microporosity of a superalloy isometric blade or structural casting of claim 1, wherein the outer portion of the cross section is a rapidly solidified fine isometric crystal, the outer portion is an inner portion of the cross section is a directionally grown columnar crystal composition, and the inner portion of the cross section is a coarse isometric crystal.
7. The method for predicting the microporosity of the superalloy blade or the structural casting according to claim 6, wherein when the area of the cross section occupied by the columnar crystal is more than 70%, the outer portion of the cross section is fine isometric crystal, the grain size of the outer isometric crystal is less than 2mm, the columnar crystal which grows directionally from outside to inside of the cross section tends to be in butt joint, the grain length of the columnar crystal is more than 10mm, the columnar crystal occupies the whole cross section, and no coarse isometric crystal is almost seen in the inner portion, namely the inner isometric crystal occupies less than 20% of the area of the cross section, the cross section is solidified too fast, the feeding channel is narrow, sufficient feeding cannot be obtained, the defect of the microporosity is obvious, and the area percentage of the microporosity inside the casting is more than 1.5%.
8. The method for predicting the micro-porosity of the high-temperature alloy isometric crystal blade or the structural casting according to claim 6, characterized in that when the columnar crystal occupies 30-70% of the cross section area, the outer part of the cross section is the fine isometric crystal, the grain size of the outer isometric crystal is less than 2mm, the grain length of the cross section of the columnar crystal growing directionally from outside to inside is 3-10 mm, the inner part of the cross section is the coarse isometric crystal with the grain size of more than 3mm, the inner isometric crystal occupies 20-60% of the cross section area, the outer part of the cross section solidifies faster and the inner part solidifies slower, the feeding channel is in an open state for a longer time, the inner grain nucleates earlier, the larger grain can obstruct feeding, the micro-porosity is better, and the area percentage of the micro-porosity is 0.7-1.5%.
9. The method for predicting the microporosity of the high-temperature alloy isometric crystal blade or the structural casting according to claim 6, wherein when the area of the cross section is less than 30 percent, the outer part of the cross section is the isometric crystal, the grain size of the outer isometric crystal is less than 2mm, the grain length of the columnar crystal directionally grown from outside to inside of the cross section is very small or no columnar crystal is generated, namely the columnar crystal occupies less than 30 percent of the area of the cross section, the inner part of the cross section is the coarse isometric crystal with the grain size of more than 2mm, the inner isometric crystal occupies more than 60 percent of the area of the cross section, the outer part of the cross section is slowly solidified, the feeding channel is always in an open state, the outer grain of the cross section is late in nucleation and does not grow for a long time, the smaller grains cannot cause great obstruction to feeding, the microporosity is good, and the area percentage of the microporosity is 0-0.7 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131514.7A CN113894270B (en) | 2021-09-26 | 2021-09-26 | Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131514.7A CN113894270B (en) | 2021-09-26 | 2021-09-26 | Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113894270A true CN113894270A (en) | 2022-01-07 |
| CN113894270B CN113894270B (en) | 2022-11-22 |
Family
ID=79029351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111131514.7A Active CN113894270B (en) | 2021-09-26 | 2021-09-26 | Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113894270B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778456A (en) * | 2012-07-24 | 2012-11-14 | 贵州安吉航空精密铸造有限责任公司 | Fabrication and application method for casting microporosity standard spectrum |
| CN105234377A (en) * | 2015-10-28 | 2016-01-13 | 西安航空动力股份有限公司 | Method for solving loosening problem of directional solidification column crystal and single-crystal blade tenon and blade module |
| CN107014813A (en) * | 2017-05-24 | 2017-08-04 | 东北大学 | A kind of steel continuous casting billet solidifies arborescent structure detection method |
| CN107367510A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | Method for measuring isometric crystal rate of high-carbon steel continuous casting billet |
| CN110531047A (en) * | 2019-09-10 | 2019-12-03 | 青岛华翔航空科技有限公司 | A method of passing through scanning electron microscope, microscopic analysis defect type |
| CN110846560A (en) * | 2018-12-31 | 2020-02-28 | 宝鼎科技股份有限公司 | Integrally cast and formed rudder bearing wooden cage steel casting and manufacturing method thereof |
| JP2021043828A (en) * | 2019-09-13 | 2021-03-18 | 日立金属株式会社 | Analysis method of metal solidified crystal structure, and analyzing device of metal solidified crystal structure |
-
2021
- 2021-09-26 CN CN202111131514.7A patent/CN113894270B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778456A (en) * | 2012-07-24 | 2012-11-14 | 贵州安吉航空精密铸造有限责任公司 | Fabrication and application method for casting microporosity standard spectrum |
| CN105234377A (en) * | 2015-10-28 | 2016-01-13 | 西安航空动力股份有限公司 | Method for solving loosening problem of directional solidification column crystal and single-crystal blade tenon and blade module |
| CN107367510A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | Method for measuring isometric crystal rate of high-carbon steel continuous casting billet |
| CN107014813A (en) * | 2017-05-24 | 2017-08-04 | 东北大学 | A kind of steel continuous casting billet solidifies arborescent structure detection method |
| CN110846560A (en) * | 2018-12-31 | 2020-02-28 | 宝鼎科技股份有限公司 | Integrally cast and formed rudder bearing wooden cage steel casting and manufacturing method thereof |
| CN110531047A (en) * | 2019-09-10 | 2019-12-03 | 青岛华翔航空科技有限公司 | A method of passing through scanning electron microscope, microscopic analysis defect type |
| JP2021043828A (en) * | 2019-09-13 | 2021-03-18 | 日立金属株式会社 | Analysis method of metal solidified crystal structure, and analyzing device of metal solidified crystal structure |
Non-Patent Citations (1)
| Title |
|---|
| 朱苗勇等: "《连铸坯的偏析及其控制》", 30 November 2015, 冶金工业出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113894270B (en) | 2022-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Elliott et al. | Directional solidification of large superalloy castings with radiation and liquid-metal cooling: A comparative assessment | |
| Park et al. | Stray grain formation in single crystal Ni-base superalloy welds | |
| Bewlay et al. | Niobium silicide high temperature in situ composites | |
| CN111364096B (en) | Substrate-triggered single crystal high-temperature alloy directional solidification process | |
| US20100071812A1 (en) | Unidirectionally-solidification process and castings formed thereby | |
| US20130022803A1 (en) | Unidirectionally-solidification process and castings formed thereby | |
| US9144842B2 (en) | Unidirectional solidification process and apparatus and single-crystal seed therefor | |
| Yan et al. | Morphological characteristics of Al3Sc particles and crystallographic orientation relationships of Al3Sc/Al interface in cast Al-Sc alloy | |
| CN113894270B (en) | Prediction method for micro-porosity of high-temperature alloy isometric crystal blade or structural casting | |
| Xinbao et al. | Analysis of competitive growth mechanism of stray grains of single crystal superalloys during directional solidification process | |
| Chen et al. | On the dendrite deformation and evolution mechanism of Ni-based superalloy during directional solidification | |
| CN112185472A (en) | Method for predicting freckle morphology defects in directionally solidified peritectic alloy paste area | |
| US6343641B1 (en) | Controlling casting grain spacing | |
| Onyszko et al. | Turbine blades of the single crystal nickel based CMSX-6 superalloy | |
| Hu et al. | Formation mechanisms and control method for stray grains at melt-back region of Ni-based single crystal seed | |
| Sun et al. | Topologically close-packed phase precipitation in Ni-based superalloys | |
| Qin et al. | Orientation control of multiple single crystal blades using a novel high-throughput mold via seeding-grain selection technique | |
| Dong | Analysis of Grain Selection during Directional Solidification of Gas Turbine Blades. | |
| Xu et al. | Effect of competitive crystal growth on microstructural characteristics of directionally solidified nickel-based single crystal superalloy | |
| Liang et al. | Preparation and tensile properties of DD5 single crystal castings | |
| Li et al. | Effects of directional solidification parameters and crystal selector on microstructure of single crystal of Ni-base superalloys | |
| CN2721283Y (en) | Composite crystallizer for single crystal and directional cylindrulite composite crystalline blade | |
| CN112536421A (en) | Method for improving performance stability of thin-wall single crystal high-temperature alloy casting | |
| Zhang et al. | Oxidation and hot corrosion of electrodeposited Ni–7Cr–4Al nanocomposite | |
| CN202305266U (en) | Chemical analysis sample mould of high-magnesium aluminum alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |