CN110595907A - Method for improving accuracy of uniaxial hot compression test - Google Patents
Method for improving accuracy of uniaxial hot compression test Download PDFInfo
- Publication number
- CN110595907A CN110595907A CN201910706950.9A CN201910706950A CN110595907A CN 110595907 A CN110595907 A CN 110595907A CN 201910706950 A CN201910706950 A CN 201910706950A CN 110595907 A CN110595907 A CN 110595907A
- Authority
- CN
- China
- Prior art keywords
- sample
- groove
- compression
- uniaxial
- lubricant
- 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
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
- G01N3/18—Performing tests at high or low temperatures
-
- 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
- G01N2203/0019—Compressive
-
- 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
-
- 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
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a method for improving the accuracy of a uniaxial hot compression test, which comprises the following steps: placing the thermally compressed cylindrical sample between compression bars for uniaxial thermal compression; the end face of the thermal compression cylindrical sample is provided with a groove, and a lubricant is filled in the groove. This application is at the in-process of unipolar hot compression, through set up the recess at the sample terminal surface, cooperates emollient, makes the sample be in and warp under the one-way stress state, and the friction between sample and depression bar is close ideal state, has improved the accuracy and the uniformity of material flow stress data.
Description
Technical Field
The invention relates to the technical field of material hot working and data processing, in particular to a method for improving the accuracy of a uniaxial hot compression test.
Background
Accurate compressive rheological stress data is the basis for formulating the evolution law of the metal material hot working process, process numerical simulation and calibration deformation microstructure. The torsion test method, uniaxial tension test method, and uniaxial compression test method can all be used to determine the rheological behavior of a material, but the uniaxial compression method is most widely used.
Uniaxial hot compression generally employs two devices: thermal analogue testing machines (e.g. Gleeble from DSI) and high temperature universal testing machines (e.g. MTS test system). The uniaxial hot compression test piece used conventionally is a cylinder, and as shown in fig. 1, in order to avoid instability during compression, the aspect ratio of the test piece is generally 3: 2. however, in the compression process, friction inevitably exists between the end face of the sample and the pressure rod, so that the middle part of the sample after deformation generates a bulging phenomenon, and the sample is not cylindrical in an ideal state (without friction), and stress strain data obtained by an experiment is not accurate and can be used only through friction correction, so that the uncertainty and complexity of the experiment are increased.
To reduce the effects of friction, lubricating layer materials such as graphite flakes, glass frit, and boron nitride are typically added between the sample and the plunger. Nevertheless, the lubrication of each experiment is difficult to ensure consistency, and experimental errors and poor repeatability are inevitable in the case where the friction coefficient cannot be directly obtained.
Disclosure of Invention
The invention aims to provide a method for improving the accuracy of a uniaxial hot compression test, which can reduce the bulging phenomenon generated in the middle of a deformed sample to the maximum extent and ensure the accuracy of the compression rheological stress data.
In view of the above, the present application provides a method for improving the accuracy of uniaxial hot compression test, comprising:
placing the thermally compressed cylindrical sample between compression bars for uniaxial thermal compression; the end face of the thermal compression cylindrical sample is provided with a groove, and a lubricant is filled in the groove.
Preferably, the depth of the groove is H1, the height of the thermally compressed cylindrical test piece is H, H1: h ═ 0.01 to 0.05: 1, the distance from the edge of the groove to the edge of the thermally compressed cylindrical test specimen is D1, D1: h1 ═ 1 to 5: 1.
preferably, the h 1: h ═ 0.02 to 0.04): 1, the D1: h1 ═ (1.5-3.5): 1.
preferably, when the temperature of the uniaxial hot compression is 450-550 ℃, the lubricant is graphite and molybdenum disulfide.
Preferably, when the temperature of uniaxial hot compression is 550-1200 ℃, the surface of the groove is provided with a boron nitride layer, a mica layer and a graphite layer in sequence from the end close to the groove.
Preferably, the thickness of the graphite layer is 100 microns, the thickness of the mica layer is 80 microns, and the groove is filled with the thickness of the boron nitride layer.
Preferably, the uniaxial hot compression temperature is more than 1200 ℃, and the lubricant is a glass-based lubricant.
Preferably, the groove is a cylindrical groove.
Preferably, the aspect ratio of the thermally compressed cylindrical sample is 1.5 to 2.5.
The application provides a method for improving the hot compression accuracy of a uniaxial hot compression test, which comprises the steps of placing a hot compression cylindrical sample between compression bars for uniaxial hot compression, wherein in the process, the hot compression cylindrical sample is provided with a groove, and a lubricant is filled in the groove; the existence of terminal surface recess makes sample and pressure head area of contact reduce, and frictional force reduces, and the difficult deformation district reduces, has guaranteed the accuracy of flow stress data, and the quantitative effect of recess to emollient has avoided cylindrical sample to press askew, the emergence of pressing oblique problem because of lubricated inequality in compression process simultaneously, has further guaranteed the homogeneity of cylindrical sample flow stress after warping. Therefore, this application is at the in-process of unipolar hot compression, through set up the recess at the sample terminal surface, supplementary emollient makes the sample warp under the one-way stress state, and the friction is close the ideal state, has guaranteed the accuracy and the uniformity of flow stress data.
Drawings
FIG. 1 is a schematic structural view of a uniaxial hot compression coupon of the present invention;
FIG. 2 is a graph of the internal strain distribution of a uniaxial hot compressed sample of the present invention after 50% reduction at different groove depths;
FIG. 3 is a graph of the internal strain distribution of a uniaxial hot compressed sample of the present invention after 50% reduction at different groove diameters;
FIG. 4 is a profile view of a uniaxially hot compressed sample of the present invention before and after compression;
FIG. 5 is a DEFORM finite element simulation internal equivalent strain distribution diagram of two samples after hot pressing;
fig. 6 is a load-displacement graph of two samples of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In view of the prior art, the accuracy of the rheological stress data is finally influenced by the bulging phenomenon of the sample in the uniaxial compression process, the method for improving the accuracy of the uniaxial hot compression test is provided, and the method finally enables the experimental condition of the sample to be close to an ideal state by arranging the groove on the end face of the sample and filling the lubricant into the groove, so that the accuracy and the consistency of the rheological stress data are ensured. Specifically, the embodiment of the invention discloses a method for improving the accuracy of a uniaxial hot compression test, which comprises the following steps:
placing the thermally compressed cylindrical sample between compression bars for uniaxial thermal compression; the end face of the thermal compression cylindrical sample is provided with a groove, and a lubricant is filled in the groove.
In the uniaxial hot compression process, the process may be performed according to a method of uniaxial hot compression well known to those skilled in the art, and the present application is not particularly limited. The thermal compression cylindrical sample is a cylindrical sample commonly used for uniaxial thermal compression in the field, and in order to avoid instability in the compression process, the height-diameter ratio of the thermal compression cylindrical sample is 1.5-2.5, and in a specific embodiment, the height-diameter ratio is 1.5. The specific material of the thermocompression cylindrical test piece is not particularly limited, and all materials capable of uniaxial thermocompression can be selected from the thermocompression cylindrical test piece for testing, for example, the material for the uniaxial thermocompression test can be a high temperature alloy, and in a specific embodiment, the material for the uniaxial thermocompression test is CSU-a1 powder metallurgy high temperature alloy; and the parameters related to uniaxial hot compression can be selected according to specific experimental requirements. In uniaxial hot compression test, the lubricant provided by the application is non-conductive, so a high-temperature furnace or induction heating can be selected as a heating mode, and a direct resistance heating mode cannot be used.
The key point of the application lies in that the end face of the thermal compression cylindrical sample is provided with a groove, namely the end face of the thermal compression cylindrical sample contacted with the pressure rod is provided with a groove, the shape of the groove is preferably cylindrical, and in order to ensure that the thermal compression sample can be realized, the depth of the groove and the diameter of the groove have great influence on the uniaxial thermal compression; in a specific embodiment, the depth of the groove is H1, the height of the thermally compressed cylindrical coupon is H, H1: h ═ 0.01 to 0.05: 1, the distance from the edge of the groove to the edge of the thermally compressed cylindrical test specimen is D1, D1: h1 ═ 1 to 5: 1; in certain embodiments, the h 1: h ═ 0.02 to 0.04): 1, the D1: h1 ═ (1.5-3.5): 1; more specifically, h 1: h ═ 0.02: 1, D1: h1 ═ 2.5: 1; the diameter and the depth of the groove can enable the antifriction effect to be obvious, the loading force is reduced, and the bulging of the thermal compression cylindrical sample is reduced to the maximum extent.
The accuracy of the uniaxial hot-compression rheological data cannot be guaranteed only by arranging the groove on the end face of the hot-compression cylindrical sample, and further, a lubricant needs to be filled in the groove. The grooves are filled with a lubricant to maintain parallelism of the end faces of the cylindrical test specimens. The lubricant is selected differently according to different thermal compression temperatures, and for example, when the temperature of the uniaxial thermal compression is 450-550 ℃, the lubricant is graphite or molybdenum disulfide; when the temperature of the uniaxial hot compression is 550-1200 ℃, the lubricant is boron nitride and the like; the temperature of the uniaxial hot compression is more than 1200 ℃, and the lubricant is a glass-based lubricant. In order to enhance the lubricating effect, a combination of a plurality of lubricating modes can be adopted, such as a three-layer lubricating mode of a boron nitride layer, a mica layer and a graphite layer at the temperature of 1200 ℃; the heat insulation effect of the mica and the boron nitride can also eliminate the cold end effect in the experiment; the thickness of the graphite layer is 100 microns, the thickness of the mica layer is 80 microns, and the groove is filled with the thickness of the boron nitride layer.
In the uniaxial hot compression process, the groove is formed in the end face of the cylindrical sample, so that the contact area of the sample and a pressure head is reduced, the friction force is reduced, the hard-to-deform dead zone is reduced, and the stress state of the sample cannot be changed when the friction force is greatly reduced by the groove; the quantitative target is realized through filling the emollient in the recess of terminal surface, and the emollient can be powder or spray, has avoided the cylinder sample to scribble the inequality and lead to the askew phenomenon of pressing of sample pressure. Therefore, the method provided by the application solves the problem of load rise caused by friction, and finally ensures the accuracy and consistency of the compression rheological stress data.
For further understanding of the present invention, the method for improving the accuracy of uniaxial hot compression test provided by the present invention is described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Examples
1) Taking a cylindrical sample with the height of 12mm and the diameter of 8mm, respectively processing grooves with the diameter of 6.8mm on the surface of the cylindrical sample, keeping the diameter of the grooves unchanged as shown in figure 1, designing a plurality of groups of novel samples with different groove depths h1, and simulating the thermal compression rheological behavior of the novel samples with different groove depths by using a finite element analysis software DEFORM, wherein the internal strain distribution is shown in figure 2, and other parameters are shown in table 1;
TABLE 1 simulation parameter table for samples with different groove depths at 1010 deg.C and 0.032/S rolling reduction of 50%
| Group of | H1/H0 (cylinder) | h1/H＝0.01 | h1/H＝0.02 | h1/H＝0.05 |
| Maximum diameter/mm | 5.85 | 5.76 | 5.78 | 5.79 |
| Maximum load/KN | 37.7 | 36.3 | 35.8 | 34.9 |
Fig. 2 is a graph showing the internal strain distribution of the uniaxially hot compressed samples of the present invention after 50% reduction at different groove depths, where in fig. 2, a) is the strain distribution of the cylindrical samples, and b) is h 1: strain profile of the new sample with H ═ 0.01, panel c) H1: strain profile of the new sample with H ═ 0.02, panel d) H1: strain profile of the new sample with H ═ 0.05, panel e) H1: as can be seen from fig. 2 and table 1, when the groove is too deep (fig. 2(e)), the groove wall is relatively thin, and the lubricant washes out the groove at high temperature, which does not achieve the design purpose; h 1: the value of H is suitably 0.01-0.05, preferably 0.02: not only can reduce the loading force to a certain extent, but also has good lubricating effect.
2) On a cylindrical sample with the diameter of 8 multiplied by 12mm, taking a novel sample with the groove depth of 0.24mm fixed, designing different groove diameters, and analyzing the thermal compression rheological behavior of the novel sample, wherein the result is shown in figure 3 and table 2;
TABLE 2 simulation parameter table for 1010 deg.C, 0.032/S rolling reduction 50% for different groove diameter samples
| Group of | d1/h1＝1 | d1/h1＝2 | d1/h1＝2.5 | d1/h1＝4 | d1/h1＝5 |
| Maximum diameter/mm | 5.74 | 5.76 | 5.78 | 5.81 | 5.82 |
| Maximum load/KN | 35 | 35.1 | 35.8 | 36.1 | 36.6 |
FIG. 3 is a graph of the internal strain distribution of a uniaxial hot compressed sample of the present invention after 50% reduction at different groove diameters; in fig. 3, a) is d 1: internal strain profile of the new sample with h1 ═ 1, panel b) d 1: internal strain profile of the new sample with h1 ═ 2, panel c) d 1: internal strain profile of the new sample, h1 ═ 2.5, d) d 1: internal strain profile of new sample h1 ═ 4, e) d 1: internal strain profile of the new sample h1 ═ 5; it can be known from fig. 3 and table 2 that when the ratio of the distance d1 from the edge of the groove to the edge of the sample to the depth h1 of the groove is 1-5, the maximum diameter of the novel sample after deformation is smaller than that of the cylindrical sample, which indicates that a certain antifriction effect exists, so that the d1 size is appropriate at (1-5) × h1, 2.5 is recommended, the antifriction effect is obvious in comprehensive consideration, and the load-carrying force is reduced to some extent.
3) Lubricant agent
The function of the lubricant is as follows: lubrication under high temperature and high pressure, friction control, cold end effect elimination, die wear reduction and convenient demoulding sampling.
The selection of the lubricant is based on: thermal compression temperature, sample characteristics, mold and processing conditions;
for example:
lower temperature (around 550 ℃): graphite and molybdenum disulfide;
moderate temperatures (below 1200 ℃): boron nitride, glass frit;
higher temperature (above 1200 ℃): a glass-based lubricant.
The hot working temperature of the alloy in the experiment is below 1200 ℃, so that a three-layer lubrication mode of boron nitride, mica and graphite is adopted, the boron nitride powder is filled in the grooves to realize the quantification of the lubricant, the optimal lubrication is realized, the uniform deformation is realized, and the cold end effect of the pressure head can be eliminated.
4) Heating and loading mode
When a conductive lubricant (e.g., graphite) is used, the thermal compression experiment can be performed on a Gleeble thermal simulation tester; when the lubricant is not conductive, it can be performed on a material testing system such as MTS, equipped with an induction heating system if a thermal analog testing machine is still desired. The mold material of the loading system can be selected from mold steel or high-temperature alloy when used at a lower temperature; higher temperature (<SiC and Si can be selected at 1200-1400 DEG C3N4Or TZM molybdenum titanium zirconium alloy; higher temperatures may be used with high temperature ceramics (the mold material is also selected with consideration for the processing resistance of the compressed material).
5) After the relevant parameters and conditions are determined, performing a thermal compression experiment and performing relevant effect analysis, specifically:
rapidly heating a CSU-A1 powder metallurgy high-temperature alloy sample with the size of phi 8 multiplied by 12mm and the size of a groove of phi 6.8 multiplied by 0.24mm, filling boron nitride in the groove and placing mica and graphite sheets at two ends to a target temperature, preserving heat for 15min to enable a temperature field inside the sample to be uniform, carrying out isothermal hot compression on the novel sample at the target temperature at a specified rate, wherein the reduction is 6mm, and rapidly quenching the sample with water to freeze a deformed tissue after the hot compression is finished for subsequent microscopic characterization. While uniaxial hot compaction was performed on the same size cylindrical samples (without grooves) in comparison, the test conditions were the same as above. The die material adopted by the hot compression finite element simulation is AISI-H26, the size is phi 30 multiplied by 30mm, the grid number of the workpiece is as follows: 1500, die grid number: 1000, heat transfer coefficient: die-workpiece: 10N/sec/mm/c; mold-lubricant, lubricant-workpiece: 2N/sec/mm/c; coefficient of friction: cylindrical sample: 0.2; novel sample: 0; convection coefficient: 0.02N/sec/mm/c; the target temperature can be 954 ℃, 1066 ℃, 1010 ℃ or 1121 ℃ respectively; the above specified rates can be respectively selected from 0.0032/S, 0.01/S or 0.032/S, in which the target temperature is 1010 ℃ and the specified rate is 0.032/S;
the novel sample sprayed with boron nitride is shown in fig. 4(a), the groove is uniformly filled with boron nitride powder, and the sample applied with the lubricant can still keep good end face parallelism; the appearance of the traditional cylindrical sample after hot pressing is shown in fig. 4(b), because the friction of the end surface is large, the sample has obvious swelling, and the swelling is larger when the friction is larger; the appearance of the new sample after hot pressing is shown in fig. 4(c), and it can be seen that the sample can still maintain a cylindrical shape in an ideal state when the rolling reduction is 50%.
From the cylinder upset friction coefficient measurement method, the friction coefficient during the hot compression process can be calculated according to equation 1:
b＝4ΔRh/(RΔh) (2)
wherein, m-coefficient of friction; r-ideal radius (after no frictional deformation); h-post-press height; b-the coefficient of drumbeat; Δ R-the difference between the maximum and minimum radii after compression; delta h-rolling reduction; h is0、R0Initial height and radius, respectively;
TABLE 3 Friction coefficient m-value data sheet
| Group of | 1121℃ | 1066℃ | 1010℃ | 954℃ | Average |
| Novel test sample | 0.02 | 0.01 | 0.01 | 0.04 | 0.02 |
| Cylindrical test sample | 0.15 | 0.28 | 0.30 | 0.31 | 0.26 |
According to the formula and the measurement value of the experiment, the friction coefficient of the CSU-A1 powder high-temperature alloy hot compression process under the experiment condition (954-1121 ℃) is calculated and obtained as shown in Table 3, and the following can be seen: even if the same lubrication is used, the cylindrical sample still has friction coefficients of about 0.2 and 0.3, the calculated friction coefficient of the novel sample is close to 0, the friction eliminating effect is obvious, the experimental accuracy is improved, and the obtained rheological stress data can be used without friction correction.
FIG. 5 is a DEFORM finite element simulation two kinds of samples 1010 ℃, and an internal equivalent distribution graph after 0.032/S hot pressing, wherein (5a) is a distribution graph of a traditional cylindrical sample, and (5b) is a distribution graph of a novel sample, and the finite element simulation result of FIG. 5 shows that the maximum radius of the novel sample after hot pressing is 5.78mm, the cylindrical sample is 5.85mm, the drum degree of the novel sample is obviously smaller than that of the cylindrical sample, and the novel sample is matched with the experimental result (FIG. 4); the distribution of the local strain inside the novel sample is more uniform, and in comparison, a larger local strain gradient exists in the cylindrical sample, and the area of a deformation dead zone is larger. Therefore, the novel sample microstructure fits a wider observation area with the same local strain.
FIG. 6 is a graph showing load-displacement curves at 1010 ℃ for the conventional and novel samples, after 0.032/S was pressed at 50%. (6a) Is an experimental measurement value; (6b) is the result of finite element simulation of DEFORM. As can be seen from fig. 6, the load required to compress the new sample is lower than that of the cylindrical sample, reducing the load burden and the experimental cost of the hot press apparatus.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method of improving the accuracy of a uniaxial hot compression test comprising:
placing the thermally compressed cylindrical sample between compression bars for uniaxial thermal compression; the end face of the thermal compression cylindrical sample is provided with a groove, and a lubricant is filled in the groove.
2. The method of claim 1, wherein the depth of the groove is H1, the height of the thermally compressed cylindrical coupon is H, H1: h ═ 0.01 to 0.05: 1, the distance from the edge of the groove to the edge of the thermally compressed cylindrical test specimen is D1, D1: h1 ═ 1 to 5: 1.
3. the method according to claim 1 or 2, wherein the h 1: h ═ 0.02 to 0.04): 1, the D1: h1 ═ (1.5-3.5): 1.
4. the method according to claim 1 or 2, wherein the lubricant is graphite and molybdenum disulfide when the uniaxial hot compression temperature is 450 to 550 ℃.
5. The method according to claim 1 or 2, wherein the uniaxial hot compression temperature is 550-1200 ℃, and the groove surface is provided with a boron nitride layer, a mica layer and a graphite layer in sequence from the end near the groove.
6. The method of claim 5, wherein the graphite layer has a thickness of 100 microns, the mica layer has a thickness of 80 microns, and the boron nitride layer has a thickness that fills the grooves.
7. The method according to claim 1 or 2, wherein the temperature of the uniaxial hot compaction is greater than 1200 ℃ and the lubricant is a glass-based lubricant.
8. A method according to claim 1 or 2, wherein the recess is a cylindrical recess.
9. The method according to claim 1 or 2, wherein the aspect ratio of the thermally compressed cylindrical sample is 1.5 to 2.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706950.9A CN110595907B (en) | 2019-08-01 | 2019-08-01 | Method for improving accuracy of uniaxial hot compression test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706950.9A CN110595907B (en) | 2019-08-01 | 2019-08-01 | Method for improving accuracy of uniaxial hot compression test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110595907A true CN110595907A (en) | 2019-12-20 |
| CN110595907B CN110595907B (en) | 2021-03-12 |
Family
ID=68853322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910706950.9A Active CN110595907B (en) | 2019-08-01 | 2019-08-01 | Method for improving accuracy of uniaxial hot compression test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110595907B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129631A (en) * | 2020-09-16 | 2020-12-25 | 浙江久立特材科技股份有限公司 | Cold deformation die working curve design method based on full-size strain strengthening |
| CN112964568A (en) * | 2021-01-18 | 2021-06-15 | 江阴兴澄特种钢铁有限公司 | Method for carrying out high strain rate uniaxial compression test by using L-gauge |
| CN113188948A (en) * | 2021-04-21 | 2021-07-30 | 博深股份有限公司 | Uniaxial compressibility determination method of metal powder in warm-pressing state |
| RU2763855C1 (en) * | 2021-03-26 | 2022-01-11 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Installation for evaluation of low-temperature properties of grease lubricants for heavy-loaded sliding friction units |
| RU2815207C1 (en) * | 2023-11-02 | 2024-03-12 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Method of evaluating low-temperature properties of semifluid lubricants |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660370A (en) * | 2012-05-10 | 2012-09-12 | 张家港拓普新材料科技有限公司 | High-temperature lubricating agent and preparation process thereof |
| CN105300799A (en) * | 2015-11-11 | 2016-02-03 | 大连理工大学 | Quasi-state single shaft compression experiment method and apparatus thereof |
| CN106644629A (en) * | 2016-11-16 | 2017-05-10 | 邢鑫鑫 | Thermocompression sample processing device for Gleeble thermal simulated test machine |
| CN108892541A (en) * | 2018-07-10 | 2018-11-27 | 山东国晶新材料有限公司 | A kind of preparation method of cylindrical composite heater |
-
2019
- 2019-08-01 CN CN201910706950.9A patent/CN110595907B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660370A (en) * | 2012-05-10 | 2012-09-12 | 张家港拓普新材料科技有限公司 | High-temperature lubricating agent and preparation process thereof |
| CN105300799A (en) * | 2015-11-11 | 2016-02-03 | 大连理工大学 | Quasi-state single shaft compression experiment method and apparatus thereof |
| CN106644629A (en) * | 2016-11-16 | 2017-05-10 | 邢鑫鑫 | Thermocompression sample processing device for Gleeble thermal simulated test machine |
| CN108892541A (en) * | 2018-07-10 | 2018-11-27 | 山东国晶新材料有限公司 | A kind of preparation method of cylindrical composite heater |
Non-Patent Citations (4)
| Title |
|---|
| 付明杰等: "TiAl合金高温压缩变形条件下的本构模型", 《钢铁研究学报》 * |
| 张戈等: "热模拟压缩试样两端鼓肚现象的研究改善", 《土木建筑与环境工程》 * |
| 张艳姝等: "TC4钛合金高温本构关系的研究", 《热加工工艺》 * |
| 邹子和: "《不锈钢管和型钢的热挤压》", 31 August 2014, 冶金工业出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129631A (en) * | 2020-09-16 | 2020-12-25 | 浙江久立特材科技股份有限公司 | Cold deformation die working curve design method based on full-size strain strengthening |
| CN112964568A (en) * | 2021-01-18 | 2021-06-15 | 江阴兴澄特种钢铁有限公司 | Method for carrying out high strain rate uniaxial compression test by using L-gauge |
| CN112964568B (en) * | 2021-01-18 | 2022-09-30 | 江阴兴澄特种钢铁有限公司 | Method for carrying out high strain rate uniaxial compression test by using L-gauge |
| RU2763855C1 (en) * | 2021-03-26 | 2022-01-11 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Installation for evaluation of low-temperature properties of grease lubricants for heavy-loaded sliding friction units |
| CN113188948A (en) * | 2021-04-21 | 2021-07-30 | 博深股份有限公司 | Uniaxial compressibility determination method of metal powder in warm-pressing state |
| CN113188948B (en) * | 2021-04-21 | 2024-04-05 | 博深股份有限公司 | Method for measuring uniaxial compressibility of metal powder in warm-pressing state |
| RU2815207C1 (en) * | 2023-11-02 | 2024-03-12 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Method of evaluating low-temperature properties of semifluid lubricants |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110595907B (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110595907B (en) | Method for improving accuracy of uniaxial hot compression test | |
| Oh et al. | Analysis of the billet deformation during equal channel angular pressing | |
| Li et al. | Friction coefficient in hot compression of cylindrical sample | |
| Pater et al. | Establishment of a new hybrid fracture criterion for cross wedge rolling | |
| CN111753453B (en) | High-precision simulation method for high-strength steel die forging forming process | |
| Li et al. | A study on hot extrusion of Ti–6Al–4V using simulations and experiments | |
| Wang et al. | Simulation of temperature and stress in 6061 aluminum alloy during online quenching process | |
| Murata et al. | Compression spinning of circular magnesium tube using heated roller tool | |
| Liu et al. | Investigation of cold drawing process of thin-walled ribbed steel tube | |
| Wen et al. | Investigations on the interfacial heat transfer coefficient during hot stamping of ultra-high strength steel with Al-Si coating | |
| Asif et al. | Experimental investigation of thermal properties of tool steel and mild steel with heat treatment | |
| Liang et al. | Simulation of extrusion process of AZ31 magnesium alloy | |
| Liu et al. | La-based bulk metallic glass failure analysis under static and dynamic loading | |
| Kim et al. | The effect of a rubber mold on densification and deformation of a metal powder compact during cold isostatic pressing | |
| Sleboda et al. | The effect of thermomechanical processing on the properties of Fe–40 at.% Al alloy | |
| Semiatin et al. | A comparison of the plastic-flow response of a powder-metallurgy nickel-base superalloy under nominally-isothermal and transient-heating hot-working conditions | |
| Kang et al. | Densification behavior of iron powder during cold stepped compaction | |
| Kolbasnikov et al. | The Bauschinger effect and the formation of microalloyed-steel properties in pipe manufacture | |
| Lame et al. | Anisotropic shrinkage and gravity induced creep during sintering of steel powder compacts | |
| Yang et al. | Rubber isostatic pressing and cold isostatic pressing of metal powder | |
| Xinbo et al. | Research on the flow stress characteristics of AISI 1006 and AISI 5140 in the temperature range of warm forging by means of thermo-mechanical experiments | |
| Kim et al. | Plastic deformation of porous metal with an initial inhomogeneous density distribution | |
| RU2532234C1 (en) | Method to measure mechanical properties of material under conditions of confined pressure (versions) | |
| Miao et al. | High temperature stress–strain curves of MnS and their applications in finite element simulation | |
| CN109900560A (en) | A kind of metal material deformation-membership credentials test method based on taper type sample |
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 |