AU2020102811A4 - Experimental device and method for testing hot cracking tendency of alloys - Google Patents
Experimental device and method for testing hot cracking tendency of alloys Download PDFInfo
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- AU2020102811A4 AU2020102811A4 AU2020102811A AU2020102811A AU2020102811A4 AU 2020102811 A4 AU2020102811 A4 AU 2020102811A4 AU 2020102811 A AU2020102811 A AU 2020102811A AU 2020102811 A AU2020102811 A AU 2020102811A AU 2020102811 A4 AU2020102811 A4 AU 2020102811A4
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- 238000012360 testing method Methods 0.000 title claims abstract description 169
- 238000005336 cracking Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000956 alloy Substances 0.000 title claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 18
- 239000011521 glass Substances 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 21
- 230000006698 induction Effects 0.000 claims description 21
- 238000002474 experimental method Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 abstract description 16
- 230000008023 solidification Effects 0.000 abstract description 16
- 239000007788 liquid Substances 0.000 description 8
- 238000005266 casting Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- 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 discloses an experimental device and method for testing the hot
cracking tendency of alloys, which comprises a test sample, wherein a glass tube is
sleeved outside the test sample; a heating system for heating the test sample is arranged
outside the test sample; one end of the test sample is fixedly connected with a tension
sensor; the other end of the test sample is provided with a displacement sensor; a sample
clamp is arranged at one end of the test sample close to the displacement sensor; a slide
block is fixedly connected below the sample clamp, the tension sensor and the
displacement sensor respectively; and the slide block is connected with a slide rail in a
sliding manner. The invention is simple to operate, by which we can measure the
relevant data of the solidification shrinkage stress-temperature-time and the
solidification shrinkage amount-temperature-time during the solidification process. The
invention has a wide application range and is suitable for measuring and evaluating the
hot cracking tendency of most alloy materials which can form a semi-solid state.
-1/4
Figure 1
Description
-1/4
Figure 1
Experimental device and method for testing hot cracking tendency of alloys
The invention relates to the technical field of casting and welding performance
testing, in particular to an experimental device and method for testing the hot cracking
tendency of alloys.
Hot cracking is a common defect in the casting and welding processes of metal
materials. The defect causes that the performance of metal materials is reduced,
potential crack sources are increased, and even some alloys with high hot cracking
tendency cannot be produced by a traditional process. The key to solve the problem of
hot cracking is to define the mechanism of hot cracking, so as to take corresponding
measures to eliminate or alleviate hot cracking. At present, all of the methods for
measuring the hot cracking tendency are to cast molten metal directly into a mold, and
analyse the hot cracking tendency by testing the stress and strain during the
solidification process. However, the stress and strain obtained by the traditional test
method are influenced by the dendrite structure and cannot objectively reflect the
relationship between the properties of the liquid film and the tendency of hot cracking.
According to the present hot cracking mechanism proposed, the properties of the
liquid film in the later stage of solidification have important relation with the
generation of the hot cracking. Due to the existence of dendrite structure, the
traditional test method can not really reflect the actual stress and strain of the liquid
film, thus limiting the research on the action mechanism of the liquid film in the
generation process of the hot cracking. Therefore, it is of great theoretical significance
and engineering value to study the characteristics of intercrystalline liquid film in the later stage of solidification of semi-solid samples for further clarifying the mechanism of hot cracking and putting forward more accurate prediction criteria.
In recent years, castings have developed in the direction of lightness, thinness
and complex shapes, which puts forward higher requirements on how to reduce the
hot cracking tendency of castings. Some experimental methods for evaluating the hot
cracking tendency of alloys, which are designed and developed by researchers at
present, mainly include hot cracking ring method, critical dimension method and
critical load method, etc. The hot cracking test device used in the experiment process
is basically designed according to the solidification shrinkage principle of casting
itself. However, most of these devices are used to study alloy systems with high
tendency of hot cracking. For alloy systems with low tendency of hot cracking, it's
difficult for these devices to accurately acquire some relevant information and data in
the process of hot cracking, so that the critical solidification shrinkage force at the
time of initiation of hot cracking of alloys cannot be accurately acquired. Therefore, it
is necessary to propose a new method and experimental device for directly testing the
properties of liquid film to reflect the tendency of hot cracking of alloys.
The invention aims to provide an experimental device and method for testing the
hot cracking tendency of alloys so as to solve the above problems existing in the
present techniques. The experimental device and method are simple to operate and
wide in application range, and are suitable for measuring and evaluating the hot
cracking tendency of most alloy materials which can form a semi-solid state.
In order to achieve the above aim, the invention provides an experimental device
for testing the hot cracking tendency of alloys, wherein a test sample is comprised, a
glass tube is sleeved outside of the test sample; a heating system for heating the test
sample is arranged outside of the test sample; a tension sensor is fixedly connected to one end of the test sample; a displacement sensor is arranged on the other side of the test sample; a sample clamp is arranged on one end of the test sample close to the displacement sensor; below the sample clamp; the tension sensor and the displacement sensor, a slide block is fixedly connected to them respectively; the slide block is connected with a slide rail; the slide block is provided with a slide rail locking knob; the heating system, the tension sensor and the displacement sensor are connected with a computer.
Preferably, the test sample is cylindrical, and a sample support plate is arranged between the test sample and the glass tube.
Preferably, one side of the test sample is in threaded connection with one side of a connecting screw rod, the other side of the connecting screw rod is in threaded connection with a tension sensor, the tension sensor is fixedly connected with a fixed seat, and the fixed seat is fixedly connected with a slide block below thefixed seat.
Preferably, the sample clamp comprises clamping plates arranged on the upper side and the lower side of a test sample, the middle part of each clamping plate is provided with an arc-shaped groove matched with the test sample, two sides of the upper group and the lower group of clamping plates are detachably connected through fasteners, and the clamping plates positioned at the lower side are fixedly connected with a slide block below the clamping plates through screws.
Preferably, the outer side of the displacement sensor is provided with a fixed clamp, and the fixed clamp is fixedly connected with a slide block below the fixed clamp through a screw rod.
Preferably, the heating system comprises an induction coil and a temperature detector, wherein the induction coil is arranged outside the test sample, and the induction coil is connected with a high-frequency induction power supply.
An experimental method for testing the hot cracking tendency of alloys, which is carried out on the basis of the experimental device for testing the hot cracking tendency of alloys according to any one of the above claims, is characterized in that:
Step one. Check whether the heating system, the tension sensor and the
displacement sensor are normal or not;
Step two. Slide the three groups of slide blocks into the slide rail in sequence,
and connect the sample clamp, the tension sensor and the displacement sensor are
respectively and fixedly with the slide rail below the sample clamp;
Step three. Connect one end of the test sample fixedly with the tension sensor,
sleeve the glass tube outside the test sample, and sleeve the sample clamp on one end
of the test sample close to the displacement sensor;
Step four. Put one end of the test sample, which is far away from the tension
sensor, in close contact with the displacement sensor;
Step five. Heat the test sample through the heating system, and heat the test
sample to the temperature where the test sample is semi-solid, then preserve the
temperature;
Step six. Cool the test sample, and respectively test the shrinkage stress and the
shrinkage displacement of the test sample during the cooling process.
Preferably, in step 6, before cooling the test sample, fix the slide block under the
tension sensor on the slide rail, fix the slide block under the sample clamp on the slide
rail, fix both ends of the test sample by clamping the test sample with the sample
clamp, and measure the shrinkage stress during the process of cooling the test sample
by the tension sensor.
Preferably, before cooling the test sample, fix the slide block below the tension
sensor on the slide rail, connect the slide block below the sample clamp with the slide
rail in a sliding manner, fix the slide block below the displacement sensor on the slide
rail. The end of the test sample close to the tension sensor is the fixed end, the end of
the test sample close to the displacement sensor is the free end. Measure the shrinkage displacement by the displacement sensor during the process of cooling the test sample.
The invention discloses the following technical effects: heat the test sample to a
semi-solid temperature at a certain heating speed by utilizing high-frequency
electromagnetic induction. Test the shrinkage stress by the tension sensor during
solidification shrinkage. Obtain the stress and strain of the liquid film in the later
period of solidification directly by collecting relevant data of temperature, stress and
time online through the computer. Or test the shrinkage displacement by the
displacement sensor during solidification shrinkage, and acquire relevant data of
temperature, displacement and time online through the computer, so that alloys hot
cracking tendency analysis based on the property change of the liquid film is realized.
According to the invention, the test of the shrinkage stress and the shrinkage
displacement of the test sample is switched through the connection relationship
between the three groups of slide blocks and the slide rail and the connection
relationship between the sample clamp and the test sample.
The invention is simple to operate, by which we can measure the relevant data of
the solidification shrinkage stress-temperature-time and the solidification shrinkage
amount-temperature-time during the solidification process. The invention has a wide
application range and is suitable for measuring and evaluating the hot cracking
tendency of most alloy materials which can form a semi-solid state.
In order to provide a clearer picture of the embodiment of the invention or the
technical solutions in the existing techniques, a brief introduction of the appended
drawings to be used in the embodiment is given below. Obviously, the appended
drawings described below are only some embodiments of the invention. For the
ordinary technical personnel in this field, other appended drawings may be obtained
on the basis of these appended drawings without the cost of creative labour.
Figure 1 is a structural diagram of the experimental device of the invention;
Figure 2 is a partial enlarged view of A in Figure 1;
Figure 3 is a sectional view of the experimental apparatus device of the
invention;
Figure 4 is a partial enlarged view of B in Figure 3;
Wherein 1 is a test sample, 2 is a glass tube, 3 is a sample supporting plate, 4 is a
tension sensor, 5 is a displacement sensor, 6 is a sample clamp, 7 is a slide block, 8 is
a slide rail, 9 is a slide rail locking knob, 10 is a computer, 11 is a connecting screw
rob, 12 is a fixed seat, 13 is a clamping plate, 14 is a fastener , 15 is a fixing clamp
and 16 is an induction coil.
Following is a clear and complete description of the technical scheme in the
embodiments of the invention in conjunction with the appended drawings in the
embodiments of the invention. Obviously, the embodiments described are only part of
all embodiments of the invention, not the whole. Based on these embodiments of the
invention, all other embodiments obtained by ordinary technicians in the field without
making creative labor are within the scope of protection of the invention.
In order to make the above-mentioned purposes, characteristics and advantages
of the invention more clearly understood, a step-by-step detailed description of the
invention is given in combination with the appended drawings and the concrete
implementation method.
Referring to Figures 1-4, the invention provides an experimental device and
method for testing the hot cracking tendency of alloys, comprising a test sample 1
which has a spherical structure and a volume fraction of liquid phase no less than 30%.
A glass tube 2 is sleeved outside the test sample 1, the test sample 1 is cylindrical, a sample supporting plate 3 is arranged between the test sample 1 and the glass tube 2, and the test sample 1 is effectively supported by the sample supporting plate 3 and the glass tube 2.
A heating system for heating the test sample 1 is arranged outside the test sample
1; the heating system comprises an induction coil 16 and a temperature detector,
which are arranged outside the test sample 1; the induction coil 16 is connected with a
high-frequency induction power supply, and the temperature detector is an infrared
temperature detector. Cooling water is introduced into the induction coil 16 to prevent
the induction coil 16 from being damaged due to overheating of a long-term operation.
According to the invention, the temperature of the sample is fed back by infrared
temperature measurement, and the heating power is adjusted by the computer system,
so that the purposes of uniform heating and uniform cooling of the sample are
achieved.
The induction coil 16 is provided with two groups and a certain distance is
formed between the two groups. The distance is supposed to be larger than the
diameter of the test sample 1. The test sample 1 is horizontally arranged in the middle
of the induction coil 16. The middle of the induction coil 16 is a region where the
sample is heated; the heating efficiency is high, and the heating is uniform. The
induction coil 16 is of a semi-closed type, so that realizing non-contact infrared
temperature measurement on the sample is feasible.
One end of the test sample 1 is fixedly connected with a tension sensor 4, the
other side of the test sample 1 is provided with a displacement sensor 5, one end of
the test sample 1 close to the displacement sensor 5 is provided with a sample clamp 6,
a slide block 7 is fixedly connected below the sample clamp 6, the tension sensor 4
and the displacement sensor 5 respectively, the slide block 7 is connected with a slide
rail 8 in a sliding way, a slide rail locking knob 9 is arranged on the slide block 7, a
computer 10 is connected with a heating system, the tension sensor 4 and the
displacement sensor 5, the slide rail 8 is fixed on a horizontal plane. The test sample 1 is horizontally arranged to improve the measure accuracy.
According to a further optimization scheme, one side of the test sample 1 is in
threaded connection with one side of a connecting screw rob 11, the other side of the
connecting screw rob 11 is in threaded connection with the tension sensor 4, the
tension sensor 4 is fixedly connected with a fixed seat 12, and the fixed seat 12 is
fixedly connected with the slide block 7 below the fixed seat 12.
According to a further optimization scheme, the sample clamp 6 comprises
clamping plates 13 arranged on the upper side and the lower side of the test sample 1.
The middle part of each clamping plate 13 is provided with an arc-shaped groove
matched with the test sample 1, both of the two clamping plates 13 are detachably
connected through fasteners 14, and the clamping plates 13 positioned at the lower
side are fixedly connected with the slide block 7 below the clamping plates 13
through the screw rob.
According to a further optimization scheme, a fixing clamp 15 is arranged on the
outer side of the displacement sensor 5, and the fixing clamp 15 isfixedly connected
with the slide block 7 below the fixing clamp 15 through the screw rod.
An experimental method for testing the hot cracking tendency of alloys, which is
carried out on the basis of the above experimental device for testing the hot cracking
tendency of alloys, including test of the shrinkage stress and the shrinkage
displacement of the test sample 1.
Step one. Check whether the heating system, the tension sensor 4 and the
displacement sensor 5 are normal;
Step two. Slide the three groups of slide blocks 7 into the slide rail 8 in sequence,
and connect the sample clamp 6, the tension sensor 4 and the displacement sensor 5
are respectively and fixedly with the slide rail 8 below them;
Step three. Connect one end of the test sample 1 fixedly with the tension sensor 4,
sleeve the glass tube 2 outside the test sample 1, and sleeve the sample clamp 6 on one end of the test sample 1 close to the displacement sensor 5;
Step four. Put one end of the test sample 1, which is far away from the tension
sensor 4, in close contact with the displacement sensor 5;
Step five. Heat the test sample 1 through the heating system, and heat the test
sample 1 to the temperature where the test sample 1 is semi-solid, then preserve the
temperature;
Step six. When testing the shrinkage stress of the test sample: before cooling the
test sample 1, fix the slide block 7 under the tension sensor 4 on the slide rail 8, fix
the slide block 7 under the sample clamp 6 on the slide rail 8, fix both ends of the test
sample 1 by clamping the test sample with the sample clamp 6; then cool the test
sample 1, measure the shrinkage stress in the cooling process of the sample by the
tension sensor 4, and collect relevant data of temperature, stress and time online
through the computer.
When testing the shrinkage displacement of the test sample: before cooling the
test sample 1, fix the slide block 7 below the tension sensor 4 on the slide rail 8,
connect the slide block 7 below the sample clamp 6 with the slide rail 8 in a sliding
manner, fix the slide block 7 below the displacement sensor 5 on the slide rail 8. The
end of the test sample 1 close to the tension sensor 4 is the fixed end, the end of the
test sample 1 close to the displacement sensor 5 is the free end.; then cool the test
sample 1, measure the shrinkage displacement in the cooling process of the sample
through the displacement sensor 5, and collect relevant data of temperature,
displacement and time online through the computer.
The specific experimental steps for measuring the solidification shrinkage stress
of the Al-4Cu alloy are as follows:
Step one. Check whether the heating system, the tension sensor 4 and the
displacement sensor 5 are normal;
Step two. Slide the three groups of slide blocks 7 into the slide rail 8 in sequence,
and connect the sample clamp 6, the tension sensor 4 and the displacement sensor 5
are respectively and fixedly with the slide rail 8 below them;
And step three. Connect one end of the test sample 1 fixedly with the tension
sensor 4, sleeve the glass tube 2 outside the test sample 1; move the test sample 1 and
the glass tube 2 together to the middle position of the induction coil 16; and sleeve the
sample clamp 6 on one end of the test sample 1 close to the displacement sensor 5.
Adjust the height of the sample clamp 6 to make the center of the sample clamp 6
concentric with the test sample 1. Keep the sample clamp 6 loose so as to ensure that
the test sample 1 can move freely. Aim the infrared thermometer at the heating part of
the sample to be tested;
Step four. Put one end of the test sample 1, which is far away from the tension
sensor 4, in close contact with the displacement sensor 5;
Step five. Introduce cooling water into the high frequency induction coil; connect
the sensing wire of the stress sensor to the computer, and reset; heat the test sample 1
through a heating system to a semi-solid temperature, and then preserve the
temperature; heat the test sample 1 to 630 DEG C at a speed of 10 DEG C/min, and
preserve the temperature for 20 min;
Step six, before cooling the test sample 1, fix the slide block 7 below the tension
sensor 4 on the slide rail 8, fix the slide block 7 below the sample clamp 6 on the slide
rail 8 in a sliding manner, and clamp the test sample by the sample holder 6 to fix the
two ends of test sample 1. Then cool the test sample 1 to room temperature at a
cooling rate of 0.5 DEG C / s, measure the shrinkage stress in the cooling process of
the sample by the tension sensor 4, and collect relevant data of temperature, stress and
time online through the computer.
The specific experimental steps for measuring the solidification shrinkage
amount of the Al-4Cu alloy are as follows:
Step one. Check whether the heating system, the tension sensor 4 and the
displacement sensor 5 are normal;
Step two. Slide the three groups of slide blocks 7 into the slide rail 8 in sequence,
and connect the sample clamp 6, the tension sensor 4 and the displacement sensor 5
are respectively and fixedly with the slide rail 8 below them;
Step three. Connect one end of the test sample 1 fixedly with the tension sensor 4,
sleeve the glass tube 2 outside the test sample 1; move the test sample 1 and the glass
tube 2 together to the middle position of the induction coil 16; and sleeve the sample
clamp 6 on one end of the test sample 1 close to the displacement sensor 5. Adjust the
height of the sample clamp 6 to make the center of the sample clamp 6 concentric
with the test sample 1. Keep the sample clamp 6 loose so as to ensure that the test
sample 1 can move freely. Aim the infrared thermometer at the heating part of the
sample to be tested;
Step four. Put one end of the test sample 1, which is far away from the tension
sensor 4, in close contact with the displacement sensor 5;
Step five. Introduce cooling water into the high frequency induction coil; connect
the sensing wire of the stress sensor to the computer, and reset; heat the test sample 1
through a heating system to a semi-solid temperature, and then preserve the
temperature; heat the test sample 1 to 630 DEG C at a speed of 10 DEG C/min, and
preserve the temperature for 20 min;
Step six. Before cooling the test sample 1, fix the slide block 7 below the tension
sensor 4 on the slide rail 8, connect the slide block 7 below the sample clamp 6 with
the slide rail 8 in a sliding manner, fix the slide block 7 below the displacement sensor
on the slide rail 8. The end of the test sample 1 close to the tension sensor 4 is the
fixed end, the end of the test sample 1 close to the displacement sensor 5 is the free end.; then cool the test sample I to room temperature at a cooling rate of 0.5 DEG C/ s, measure the shrinkage stress in the cooling process of the sample by the displacement sensor 5, and collect relevant data of temperature, displacement and time online through the computer.
The test of the shrinkage stress and the shrinkage displacement of the test sample
1 is switched between the connection relationship between the three groups of slide
blocks and the slide rail and the connection relationship between the sample clamp 6
and the test sample 1.
In the description of the invention, what needs to be understood is that the terms
"vertical", "horizontal", "up", "down", "front", "back", "left", "right", "vertical",
"horizontal", "top", "bottom", "inside", "outside" are indicating orientation or position
relationship based on the appended drawings, only for the convenience of describing
the invention, and not indicating or implying that the device or element in question
must have a specific orientation, or must be constructed and operated in a specific
orientation, so this should not be understood as a limitation of the invention.
The above-described embodiments are merely illustrative of the preferred
embodiments of the invention and are not intended to limit the scope of the invention,
and various modifications and improvements thereof made by ordinal technical
personnel in this field without departing from the spirit of the design of the invention
should be included within the scope of protection defined by the claims of the
invention.
Claims (9)
1. An experimental device for testing the hot cracking tendency of alloys, is
characterized in that: a test sample (1) is comprised, a glass tube (2) is sleeved outside of the test sample (1); a heating system for heating the test sample (1) is arranged
outside of the test sample (1); a tension sensor (4) is fixedly connected to one end of
the test sample (1); a displacement sensor (5) is arranged on the other side of the test sample (1); a sample clamp (6) is arranged on one end of the test sample (1) close to
the displacement sensor (5); below the sample clamp (6); the tension sensor (4) and
the displacement sensor (5), a slide block (7) is fixedly connected to them respectively;
the slide block (7) is connected with a slide rail (8); the slide block (7) is provided with a slide rail locking knob (9); the heating system, the tension sensor (4) and the
displacement sensor (5) are connected with a computer (10).
2. The experimental device for testing the hot cracking tendency of alloys
according to claim 1, is characterized in that: the test sample (1) is cylindrical, and a
sample support plate (3) is provided between the test sample (1) and a glass tube (2).
3. The experimental device for testing the hot cracking tendency of alloys according to claim 1, is characterized in that: one side of the test sample (1) is in
threaded connection with one side of a connecting screw rod(l1), the other side of the
connecting screw rod(l1) is in threaded connection with a tension sensor (4), the
tension sensor (4) is fixedly connected with a fixed seat (12), and the fixed seat (12) is fixedly connected with a slide block (7) below the fixed seat (12).
4. The experimental device for testing the hot cracking tendency of alloys according to claim 1, is characterized in that: the sample clamp (6) comprises
clamping plates (13) arranged on the upper side and the lower side of the test sample
(1), the middle part of the clamping plates (13) is provided with an arc groove matched with the test sample (1), the two sides of the upper group and the lower
group of clamping plates (13) are detachably connected through fasteners (14), and
the clamping plates (13) on the lower side are fixedly connected with a slide block (7) below the clamping plates (13) through screws.
5. The experimental device for testing the hot cracking tendency of alloys according to claim 1, is characterized in that: the outer side of the displacement sensor
(5) is provided with a fixing clamp (15), and the fixing clamp (15) is fixedly connected with a slide block (7) below the fixing clamp (15) through a screw rod.
6. The experimental device for testing the hot cracking tendency of alloys
according to claim 1, is characterized in that: the heating system comprises an induction coil (16) and a temperature detector, arranged outside the test sample (1),
and the induction coil (16) is connected with a high-frequency induction power
supply.
7. An experimental method for testing the hot cracking tendency of alloys is
operated based on the experimental device for testing the hot cracking tendency of alloys according to any one of claims 1 to 6, characterized in that:
Step one. Check whether the heating system, the tension sensor (4) and the
displacement sensor (5) are normal;
Step two. Slide the three groups of slide blocks (7) into the slide rail (8) in
sequence, and connect the sample clamp (6), the tension sensor (4) and the
displacement sensor (5) are respectively and fixedly with the slide rail (8) below them;
Step three. Connect one end of the test sample (1) fixedly with the tension sensor
(4), sleeve the glass tube (2) outside the test sample (1), and sleeve the sample clamp
(6) on one end of the test sample (1) close to the displacement sensor (5);
Step four. Put one end of the test sample (1), which is far away from the tension
sensor (4), in close contact with the displacement sensor (5);
Step five. Heat the test sample (1) through the heating system, and heat the test
sample (1) to the temperature where the test sample (1) is semi-solid, then preserve the temperature;
Step six. Cool the test sample (1) and test the shrinkage stress and the shrinkage displacement of the test sample (1) respectively during the cooling process.
8. An experimental method for testing the hot cracking tendency of alloys
according to claim 7, is characterized in that: in step 6, before cooling the test sample
(1), fix the slide block (7) under the tension sensor (4) on the slide rail (8), fix the slide block (7) under the sample clamp (6) on the slide rail (8), fix both ends of the
test sample (1) by clamping the test sample with the sample clamp (6), and measure
the shrinkage stress during the process of cooling the test sample by the tension sensor
(4).
9. An experimental method for testing the hot cracking tendency of alloys
according to claim 7, is characterized in that: in step 6, before cooling the test sample (1), fix the slide block (7) below the tension sensor (4) on the slide rail (8), connect
the slide block (7) below the sample clamp (6) with the slide rail (8) in a sliding
manner, fix the slide block (7) below the displacement sensor (5) on the slide rail (8). The end of the test sample (1) close to the tension sensor (4) is the fixed end, the end
of the test sample (1) close to the displacement sensor (5) is the free end. Measure the
shrinkage displacement by the displacement sensor (5) during the process of cooling
the test sample.
-1/4-
Figure 1
-2/4-
Figure 2
-3/4-
Figure 3
-4/4-
Figure 4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102811A AU2020102811A4 (en) | 2020-10-16 | 2020-10-16 | Experimental device and method for testing hot cracking tendency of alloys |
Applications Claiming Priority (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116429569A (en) * | 2023-03-09 | 2023-07-14 | 内蒙金属材料研究所 | Alloy material heat-resistant characteristic testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116429569A (en) * | 2023-03-09 | 2023-07-14 | 内蒙金属材料研究所 | Alloy material heat-resistant characteristic testing device |
| CN116429569B (en) * | 2023-03-09 | 2024-04-02 | 内蒙金属材料研究所 | Alloy material heat-resistant characteristic testing device |
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