CN109443916B - Research method of solidification process information of free surface of metal melt - Google Patents
Research method of solidification process information of free surface of metal melt Download PDFInfo
- Publication number
- CN109443916B CN109443916B CN201811024965.9A CN201811024965A CN109443916B CN 109443916 B CN109443916 B CN 109443916B CN 201811024965 A CN201811024965 A CN 201811024965A CN 109443916 B CN109443916 B CN 109443916B
- Authority
- CN
- China
- Prior art keywords
- tensile sample
- tensile
- solidification
- free surface
- sample
- 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.)
- Active
Links
- 238000007711 solidification Methods 0.000 title claims abstract description 44
- 230000008023 solidification Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000011160 research Methods 0.000 title abstract description 14
- 239000013078 crystal Substances 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 210000004027 cell Anatomy 0.000 claims description 8
- 210000001787 dendrite Anatomy 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007769 metal material Substances 0.000 abstract description 7
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
Landscapes
- 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)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for researching the solidification process information of the free surface of a metal melt, which realizes the observation research of the solidification structure of the free surface of the metal melt by carrying out the steps of size design, point laser remelting, rapid stretch-breaking and fracture observation on a plate-shaped tensile sample of a metal material, is a feasible research approach for the solidification behavior of the free surface of liquid metal, and can provide a new method and new knowledge for the theoretical research of the metal solidification basis.
Description
Technical Field
The invention relates to a method for researching the information of a free surface solidification process of a metal melt.
Background
The solidification of the free surface of the liquid is a ubiquitous natural phenomenon (such as icing on the water surface), and the surface solidification phenomenon of the liquid metal can be found in solidification technologies such as casting, welding, directional solidification, laser surface modification and the like, so that the solidification behavior of the free surface of the molten metal is an important basic scientific problem in the metal solidification theory. The solidification condition of a thin layer of metal melt on the free surface of liquid metal is different from the three-dimensional crystallization space in the melt in the traditional solidification theory, the initial crystallization process is carried out in a two-dimensional plane and is influenced by a plurality of factors such as material composition, surface heat dissipation (melt radiation and gas convection heat dissipation), melt convection, surface tension, atmosphere, added materials (powder, wire materials and the like), surface inclusion and the like, so that the surface solidification structure is different and the rule is difficult to find, and the research on the solidification behavior of the free surface of liquid metal is lack of feasible breakthrough for a long time.
The Laser Surface Remelting (LSR) technology is carried out under strict argon protection, so that the oxidation/nitridation of the surface of a molten pool can be effectively avoided, and the material subjected to laser remelting has high surface smoothness, does not need post-treatment and can be directly observed; the remelting melting pool solidification behavior on the laser surface is one of the common processes of laser processing technologies such as laser additive manufacturing, laser welding, laser surface modification and the like, and has representativeness and universality, so the technology can be used as an experimental means for researching the free surface solidification behavior of the melting pool.
Disclosure of Invention
The invention aims to solve at least one of the problems and provides a method for researching information of a free surface solidification process of a metal melt.
The method for researching the information of the free surface solidification process of the metal melt comprises the following steps:
s1, designing a tensile sample with a specific thickness.
And S2, under the condition of specific oxygen content, performing spot laser surface remelting on the central part of the gauge length section of the tensile sample, and naturally cooling to enable thermal cracks to appear in the gauge length section.
S3, selecting the thermal crack of the main extension consistent with the width direction of the tensile sample as the observation object, and recording the position.
S4, stretching the tensile specimen with a specific tensile force along the length direction of the tensile specimen so that the tensile specimen breaks and the thermal crack becomes the beginning of the breaking position.
And S5, observing the crystal form of the selected thermal crack of the tensile sample after fracture, and deducing the solidification process information of the free surface of the metal melt according to the crystal form observation.
Wherein, the formula sigma is F/S according to the pressure intensityArea ofAccording to the previous experimental result, the empirical formula of the specific tension, the specific thickness and the gauge length width is obtained as follows:
wherein h is a specific thickness in mm, F is a specific tensile force in N, S is a gauge length section width in mm, sigma is the tensile strength of the material to be researched, and Pa and k are introduced strength reduction coefficients with the value range of 0.75-0.9 (obtained by the summary of experimental results). According to the formula, the thickness ranges of the plate-shaped tensile samples made of different metal materials can be rapidly calculated, and the final size of the sample can be determined through simple verification experiments.
The early research result shows that the laser irradiation energy in the remelting process has a linear relation with the overall dimension of the plate-shaped tensile sample, and the empirical formula of the irradiation energy (P.t) for remelting on the surface of the point-shaped laser is as follows:
P·t＝λ·L·K·h
wherein P is laser power, t is laser irradiation time, L is the length of the tensile sample and is in mm, K is the width of the tensile sample and is in mm, h is the specific thickness of the tensile sample and is in mm, lambda is an energy conversion coefficient, and the value is 0.7-1.0J/mm3(summarised from experimental results). According to the formula, the irradiation energy of different metal material spot laser remelting can be rapidly calculated, and corresponding remelting process parameters P and t can be obtained through simple preliminary experiments.
Wherein the specific oxygen content is less than 50 ppm.
And cleaning the tensile sample between the step S1 and the step S2, wherein the cleaning mode sequentially comprises the steps of washing, acetone ultrasonic cleaning, deionized water ultrasonic cleaning, drying and drying, and the drying dish is stored for less than 48 hours.
The solidification process information of the free surface of the metal melt comprises instability of a solid-liquid interface, determination of a local heat dissipation direction, a solidification speed, distribution of a liquid film at the final solidification stage and a formation mechanism of a thermal crack.
Wherein the relation among the specific tension, the specific thickness and the gauge length section width is h ═ F/s · k · σ;
in the laser surface remelting process, the relation between the laser power P and the laser irradiation time t is P & t ═ lambda & L & K & h.
The invention can realize the observation and research of the free surface solidification structure of the metal melt by carrying out size design, spot laser remelting, rapid stretch-breaking and fracture observation on the sheet-shaped tensile sample of the metal material, is a feasible research way of the free surface solidification behavior of the liquid metal, and can provide a new method and new knowledge for the theoretical research of the metal solidification basis.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a process diagram illustrating a method of investigating information about a free surface solidification process of a metal melt according to an embodiment of the invention;
FIG. 2 shows a schematic view of a plate-like tensile specimen according to an embodiment of the present invention;
FIG. 3 shows a tensile sample remelted region morphology that can be used for surface solidification structure observation according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention has the central idea that a special plate-shaped tensile sample for a metal material is taken as a research object, the surface of the tensile sample is subjected to spot laser remelting, when the tensile sample is rapidly fractured on a universal testing machine, thermal cracks in a shrinkage hole of a remelting region can rapidly expand and cause fracture, structures which can reflect solidification process information, such as cells, dendrites and the like reserved due to insufficient liquid phase feeding can be observed at the thermal cracks on the fracture surface of the tensile sample, and the solidification process of the free surface of a metal melt can be rapidly deduced by researching the morphological characteristics of the solidification structure of the thermal cracks on the surface layer of the remelting region.
The scheme of the invention will be further explained by means of specific examples.
Example 1 method for investigating solidification structure of free surface of titanium alloy melt
As shown in fig. 1, the method mainly comprises the steps of designing a tensile specimen (a); remelting the surface of the spot laser; rapidly breaking the sample (c); and (d) observing a fracture thermal crack structure, wherein the specific research steps are as follows:
design tensile specimens. The dimensions of a plate-shaped tensile sample specially used for observing a surface solidification structure are designed according to the conventional built-in parameters of a high-power laser, a universal mechanical testing machine and a scanning electron microscope used for research, and are shown in figure 2. The surface of the sample is polished, and the thickness h of the sample is determined according to the following formula: h is F/s.k.sigma.
Where F is the tensile force (in N) of the universal tester, S is the gauge length thickness of the sample (12 mm for the sample in FIG. 2), and σ is the tensile strength (in Pa) of the material under study. The tensile strength of the test specimen is reduced by the presence of thermal cracks in the remelting zone, introducing a strength reduction factor k of about 0.9. By way of example in FIG. 1, a universal tester with a tensile force of 40kN and a titanium alloy with a tensile strength of 1100MPa is selected, and h is 40 × 103/(12×10-3×0.9×1100×106)＝3.36(mm)。
The strength reduction coefficient of a metallic material having poor weldability and a high thermal tendency, such as a wrought superalloy and a wrought aluminum alloy, is preferably 0.75 to 0.9.
The surface of the tensile sample to be remelted needs to be cleaned. The cleaning method comprises the following steps: washing with water to remove obvious dirt → ultrasonic cleaning with acetone to remove oil stain → ultrasonic cleaning with deionized water → drying with a blower → storing in a drying dish. The storage time of the cleaned sample is not longer than 48 hours, otherwise the sample needs to be cleaned again.
And remelting the surface of the spot laser. In order to avoid the influence of external factors such as oxygen, nitrogen, inclusion and the like, the laser surface remelting experiment needs to be carried out in a clean, dry and closed operation box with an argon protective atmosphere. The cleaned tensile specimen is fixed in an operation box, and if a plurality of specimens exist, the specimens need to be separately placed to prevent cross thermal influence. When the oxygen content of the operation box is reduced to below 50ppm, performing punctiform laser remelting on the central position (slightly deviated) of a gauge length section of the tensile sample, namely fixing the position of a laser beam, and determining parameters by referring to the following formulas, wherein the laser power P (unit W) and the irradiation time t (unit s) are only adjusted:
P·t＝λ·V′，V′＝L·K·h
wherein V' is the reference volume (unit mm) of the tensile sample3) L is the maximum length of the tensile specimen, K is the maximum width of the specimen, and h is the thickness of the specimen (specimen size V' in fig. 2: 83 × 30 × h: 2490 · h). Lambda is an energy conversion coefficient, and is about 0.7-0.75J/mm in the case of a general alloy obtained by a research experiment3. As an example, in fig. 1, h is 3.36mm, p.t is (0.7-0.75) × 2490 × 3.36 is 5856-6275 (J), so the laser power-irradiation time parameters can be selected as follows: 3000W-2s, 2000W-3s, 2500W-2.5s, 1500W-4s, etc. The actual combination of parameters chosen will depend on the state of the laser device and is generally chosen to be an integer. The energy conversion factor lambda can be adjusted to 0.75 to 1.0 for metal materials with low laser energy absorption such as aluminum alloys and copper alloys.
The plate-shaped tensile sample after the surface remelting of the point laser is cooled under the protection of the atmosphere in the operation box, and then the plate-shaped tensile sample is placed into a drying dish for storage.
The sample was snap-broken. Before the stretch breaking operation, the heavy melt tensile specimen should be observed by SEM, and the specimen "the main expansion direction of the thermal crack is nearly perpendicular to the tensile direction" is selected and photographed to store the recording position, as shown in fig. 3 (b). Then, the plate-shaped tensile sample is broken on a universal mechanical test piece, the sample is clamped by a hydraulic clamping end, a large tensile force (40 kN in figure 1) in a measuring range is selected, the tensile force is broken by manual control, and tensile information does not need to be recorded. During the stretching process, the thermal cracks become the initial fracture sites, so the surface of the thermal cracks appears in the local part of the tensile fracture, as shown in figure 3(c), the dendritic surface of the site is smooth and has no plastic deformation characteristics, which indicates that the thermal cracks are formed at the end of the solidification of the molten pool and are not influenced by the plastic fracture of the tensile sample.
And (5) observing fracture hot crack tissues. The cell crystal and the dendrite are the most common crystal forms of liquid metal and can reflect the information of the solidification process. Placing the fracture of the tensile sample under SEM, neglecting other fracture morphologies, finding out thermal cracks at the edge of the fracture, observing the morphologies of cell crystals and dendrites in the fracture, judging the instability condition of a solid-liquid interface through the transformation of the cell crystals → the dendrites, determining the local heat dissipation direction through the growth direction of the cell crystals/the dendrites, presuming the solidification speed through the cell crystal/dendrite spacing, presuming the distribution of a liquid film at the final solidification stage and the formation mechanism of the thermal cracks through the viscous deformation morphology of the cell crystals/the dendrites, and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. The method for researching the information of the free surface solidification process of the metal melt is characterized by comprising the following steps of:
s1, designing a tensile sample with a specific thickness;
s2, under the condition of specific oxygen content, performing spot laser surface remelting on the central part of a gauge length section of the tensile sample, and naturally cooling to enable thermal cracks to appear in the gauge length section;
s3, selecting a thermal crack with the main expansion direction consistent with the width direction of the tensile sample as an observation area, and recording the position of the thermal crack;
s4, stretching the tensile sample along the length direction of the tensile sample by using a specific tensile force, so that the tensile sample is broken and the thermal crack becomes the starting point of the breaking position;
and S5, observing the crystal form of the selected hot cracks of the tensile sample after fracture, and deducing the solidification process information of the free surface of the metal melt according to the observation of the cell crystals/dendrites.
2. The method of claim 1, wherein the relationship between the specified tension, the specified thickness, and the gauge length width is:
wherein h is a specific thickness in mm, F is a specific tensile force in N, S is a gauge length section width in mm, sigma is the tensile strength of the material to be researched, and Pa and k are introduction strength reduction coefficients with the value range of 0.75-0.9.
3. The method of claim 1, wherein the relationship between the laser power P of the spot laser surface remelting and the laser irradiation time t is:
P·t＝λ·L·K·h
wherein L is the length of the tensile sample and is in mm, K is the width of the tensile sample and is in mm, h is the specific thickness of the tensile sample and is in mm, and lambda is an energy conversion coefficient and takes the value of 0.7-1.0J/mm3。
4. The method of claim 1,
the oxygen content is specified to be 50ppm or less.
5. The method of claim 1,
and cleaning the tensile sample between the step S1 and the step S2, wherein the cleaning mode sequentially comprises the steps of washing, acetone ultrasonic cleaning, deionized water ultrasonic cleaning, drying and drying in a drying dish, and the storage time of the drying dish is less than 48 hours.
6. The method of claim 1,
the solidification process information of the free surface of the metal melt comprises instability of a solid-liquid interface, determination of a local heat dissipation direction, solidification speed, distribution of a liquid film at the final solidification stage and a formation mechanism of a thermal crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024965.9A CN109443916B (en) | 2018-09-04 | 2018-09-04 | Research method of solidification process information of free surface of metal melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024965.9A CN109443916B (en) | 2018-09-04 | 2018-09-04 | Research method of solidification process information of free surface of metal melt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109443916A CN109443916A (en) | 2019-03-08 |
| CN109443916B true CN109443916B (en) | 2020-11-17 |
Family
ID=65532611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811024965.9A Active CN109443916B (en) | 2018-09-04 | 2018-09-04 | Research method of solidification process information of free surface of metal melt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109443916B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110188420A (en) * | 2019-05-15 | 2019-08-30 | 华中科技大学 | A kind of thermal cracks extension prediction technique based on numerical simulation |
| CN111693563B (en) * | 2020-05-08 | 2023-04-07 | 新兴际华集团有限公司 | Method for analyzing structure and performance of iron-based remelted layer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104226952A (en) * | 2014-01-02 | 2014-12-24 | 上海大学 | Metal solidification process simulation method |
| CN105132844A (en) * | 2015-09-30 | 2015-12-09 | 北京航空航天大学 | Method for improving high-temperature oxidation resistance of Nb-Si-based multicomponent alloy |
| CN106289969A (en) * | 2016-07-15 | 2017-01-04 | 中国核动力研究设计院 | The fracture toughness testing method of minor diameter thick-walled metal tubing |
| CN107675167A (en) * | 2017-09-04 | 2018-02-09 | 中国航发北京航空材料研究院 | A kind of superhigh intensity steel member ultrasonic impact auxiliary laser cladding restorative procedure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10541136B2 (en) * | 2016-11-29 | 2020-01-21 | President And Fellows Of Harvard College | N-type doping of strained epitaxial germanium films through co-implantation and nanosecond pulsed laser melting |
-
2018
- 2018-09-04 CN CN201811024965.9A patent/CN109443916B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104226952A (en) * | 2014-01-02 | 2014-12-24 | 上海大学 | Metal solidification process simulation method |
| CN105132844A (en) * | 2015-09-30 | 2015-12-09 | 北京航空航天大学 | Method for improving high-temperature oxidation resistance of Nb-Si-based multicomponent alloy |
| CN106289969A (en) * | 2016-07-15 | 2017-01-04 | 中国核动力研究设计院 | The fracture toughness testing method of minor diameter thick-walled metal tubing |
| CN107675167A (en) * | 2017-09-04 | 2018-02-09 | 中国航发北京航空材料研究院 | A kind of superhigh intensity steel member ultrasonic impact auxiliary laser cladding restorative procedure |
Non-Patent Citations (3)
| Title |
|---|
| Formation of metastable cellular microstructures in selective laser melted alloys;K.G. Prashanth等;《Journal of Alloys and Compounds》;20161222;第27-34页 * |
| NaBi(WO4)2 枝晶生长实时观察及其凝固组织研究;艾飞等;《中国科学》;20071231;第390-395页 * |
| 激光增材制造（３Ｄ打印）制备钛合金的微观组织研究;邹涛等;《应用激光》;20160630;第286-290页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109443916A (en) | 2019-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gao et al. | A comparative study of pulsed Nd: YAG laser welding and TIG welding of thin Ti6Al4V titanium alloy plate | |
| Arora et al. | Microstructure evolution during friction stir welding of aluminum alloy AA2219 | |
| Yang et al. | Porosity elimination and heat treatment of diode laser-clad homogeneous coating on cast aluminum-copper alloy | |
| CN109443916B (en) | Research method of solidification process information of free surface of metal melt | |
| Xu et al. | Microstructure characterization of laser welded Ti-6Al-4V fusion zones | |
| Chowdhury et al. | Fiber laser welded AZ31 magnesium alloy: The effect of welding speed on microstructure and mechanical properties | |
| Park et al. | Stray grain formation, thermomechanical stress and solidification cracking in single crystal nickel base superalloy welds | |
| JP2016128172A (en) | Titanium hot rolling ingot being hard to cause surface flaw and its manufacturing method | |
| Santhanakrishnan et al. | Macro-and microstructural studies of laser-processed WE43 (Mg-Y-Nd) magnesium alloy | |
| Fan et al. | Microstructure and mechanical properties of 6061 aluminum alloy laser-MIG hybrid welding joint | |
| Arami et al. | Microporosity control and thermal-fatigue resistance of A319 aluminum foundry alloy | |
| Lin et al. | Laser in-situ synthesis of titanium matrix composite coating with TiB–Ti network-like structure reinforcement | |
| Hongchao et al. | Diffusion bonding between Zr-based metallic glass and copper | |
| He et al. | Uncovering the roles of laser action modes in surface mechanical properties of 2024 aluminum alloy | |
| Chen et al. | Characterization, removal and evaluation of oxide film in the diffusion bonding of Zr55Cu30Ni5Al10 bulk metallic glass | |
| Nirish et al. | Fatigue Performance Improvement of AlSi10Mg Manufactured by Selective Laser Melting through Heat Treatment | |
| Meinert et al. | Refurbishment of aluminum alloys by laser cladding | |
| Lu et al. | The Femtosecond Laser Ablation on Ultrafine-Grained Copper | |
| Heczel et al. | Influence of high-pressure torsion on the microstructure and the hardness of a Ti-rich high-entropy alloy | |
| Wang et al. | Continuous recrystallization phenomenon in high purity copper during equal channel angular pressing up to high strain at room temperature | |
| He et al. | Surface grain formation mechanism in the laser remelting molten pool of a near-β titanium alloy | |
| CN105695829B (en) | A kind of magnesium alloy of low temperature resistant environment and preparation method thereof | |
| Wang et al. | An investigation on microstructures and mechanical properties of twinning-Induced plasticity steels prepared by directional solidification | |
| Motyka et al. | The effect of heat treatment on static and dynamic mechanical properties of rapidly solidified and plastically consolidated RS442 aluminium alloy | |
| Chu | Study on mechanical properties of crack healing of low carbon steel based on cyclic phase transformation heat treatment |
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 |