CN216082232U - Device for preparing fine grain region of T/P92 steel welding joint - Google Patents
Device for preparing fine grain region of T/P92 steel welding joint Download PDFInfo
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- CN216082232U CN216082232U CN202121908105.9U CN202121908105U CN216082232U CN 216082232 U CN216082232 U CN 216082232U CN 202121908105 U CN202121908105 U CN 202121908105U CN 216082232 U CN216082232 U CN 216082232U
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Abstract
The utility model discloses a device for preparing a T/P92 steel welded joint fine grain region, which comprises a preheating furnace and a heating furnace which are arranged in an up-and-down communication manner, a propelling mechanism which is arranged above the preheating furnace and used for propelling a sample to move, and a water mist cooling device which is arranged between the propelling mechanism and the preheating furnace and used for cooling the sample; the pushing mechanism comprises a transmission rod connected with the sample, a gear meshed with the transmission rod and a motor driving the transmission rod to move. The device can prepare the welding joint fine grain region of the large-size T/P92 steel sample (the size can reach 20cm x 2cm x 5cm), and the size of the prepared sample fine grain region can reach the size of the sample, namely the whole sample is the fine grain region after preparation, so that the subsequent high-temperature performance evaluation of the T/P92 steel fine grain region and the service life detection of the T/P92 steel welding joint are facilitated, and the working efficiency is improved.
Description
Technical Field
The utility model belongs to the field of steel microstructure regulation and control, and particularly relates to a device for preparing a fine grain region of a welding joint.
Background
The T/P92 steel is creep-enhanced ferrite heat-resistant steel, has excellent high-temperature creep property, and is widely applied to manufacturing high-temperature components of supercritical thermal power generating units. However, in recent years, there have been many early cracking incidents of T/P92 steel weld joints. Research shows that the fine grain region of the joint is a weak link of the T/P92 steel welding joint, the creep damage and the fracture position of the T/P92 welding joint are concentrated in the fine grain region, and the creep life of the joint is sharply reduced by early cracking of the fine grain region. The fine grain area refers to the peak temperature in the welding heat affected zone at 1100-Ac3In between, the structure is transformed into austenite, but austenite grains cannot grow sufficiently, and a region with fine grains is formed after cooling. In the welded joint of the conventional method, the total width of the heat affected zone is about 2 to 4mm, and the width of the fine grain zone is often less than 1 mm.
Although the width of the fine grain region is narrow, it greatly affects the high temperature performance of the welded joint. Therefore, the high-temperature performance evaluation of the fine crystal zone is the research focus of the T/P92 steel welding. A commonly used method for evaluating high temperature properties is creep or endurance testing, which requires obtaining larger-sized test pieces (generally, round bar-shaped test pieces need to be more than 5mm in diameter and more than 50mm in length). The heat affected zone of the actual welded joint is narrow and no conditions for sampling studies are available. Thermal simulation based on a thermal simulator or heat treatment based on a heat treatment furnace is currently used to produce heat affected zones of large size.
The large-size T/P92 thermal simulation is an effective method for preparing T/P92 steel fine grain regions, a typical Gleeble3500 type thermal die testing machine is taken as an example, the heating temperature can reach 1450 ℃, the highest heating rate of 10000 ℃/s is achieved, and the highest cooling rate of 2000 ℃/s can be achieved in the 800-500 ℃ section by adopting an aerosol cooling mode. Therefore, the thermal simulator has the condition of simulating rapid heating and cooling of the welding thermal cycle, and the heat affected zone can be controlled by taking the actual thermal cycle curve as a target when the heat affected zone is prepared. However, the method has a certain limitation, the temperature of the sample is generally monitored and controlled by a thermocouple, the thermocouple is welded on the surface of the middle part of the sample by a resistance spot welding method and is cooled by clamps at two ends of the sample, the temperature of the middle part of the sample is higher than that of the two ends of the sample, and therefore, for a rod-shaped sample, the effective width of a thermal simulation preparation fine crystal area is not more than 20 mm. The short fine grain region sample can only be subjected to a durability test, cannot be subjected to a creep test, and cannot measure the creep rate of the fine grain region. In addition, the thermal simulation testing machine is complex in system and expensive in price, only one sample can be prepared at a time, and the efficiency is low.
The heat treatment method is adopted to prepare the fine grain region, the advantage is that the size of the sample is not limited, however, the key problem of the heat treatment is that the heating speed of the heat treatment furnace is slow, the sample heated by the heat treatment furnace is generally subjected to heat conduction at the bottom of a hearth and convection of air in the hearth, and the heating speed of the core part of the sample is generally less than 120 ℃/min and is far lower than the heating speed of a heat affected zone during actual welding. Therefore, when the temperature exceeds Ac3At temperature, the austenite grains of the T/P92 steel have sufficient time to grow, and therefore the grain size of the fine grains produced by this method is often larger than the fine grains in the actual welded joint.
In conclusion, the existing heat treatment device cannot simultaneously meet the preparation requirement of the T/P92 steel fine grain region in terms of both the sample size and the heating speed, which brings obstruction to the high-temperature performance evaluation of the T/P92 steel fine grain region and simultaneously brings challenge to the service life monitoring of the T/P92 steel welding joint.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide a device capable of preparing a fine grain region of a large-size T/P92 steel welding joint, and the whole sample is prepared to be the fine grain region.
The technical scheme is as follows: the utility model relates to a device for preparing a T/P92 steel welded joint fine grain region, which comprises a preheating furnace and a heating furnace which are arranged in an up-and-down communication manner, a propelling mechanism which is arranged above the preheating furnace and used for propelling a sample to move, and a water mist cooling device which is arranged between the propelling mechanism and the preheating furnace and used for cooling the sample; the pushing mechanism comprises a transmission rod connected with the sample, a gear meshed with the transmission rod and a motor driving the transmission rod to move.
Furthermore, the device also comprises movable heat-resisting movable baffles which are respectively arranged at the top end of the preheating furnace and the top end of the heating furnace.
Furthermore, baffle guide rails are arranged at the top end of a preheating furnace and the top end of a heating furnace of the device, racks are arranged on the side edges of the movable heat-resistant movable baffles, and the movable heat-resistant movable baffles are driven by a motor to move through the meshing of the racks and the gears.
Furthermore, a conveying rod of the device is fixedly connected to the preheating furnace through a conveying rod support, and the motor is fixedly connected to the conveying rod support through a motor support.
Furthermore, the pushing mechanism of the device also comprises a conveying rod guide sleeve which is arranged on the conveying rod support and used for positioning the conveying rod, and the bottom end of the conveying rod is fixedly connected with the sample through a set clamp.
Furthermore, the preheating furnace and the heating furnace of the device both comprise furnace bodies, thermocouples arranged on the furnace bodies and resistance wires arranged in the furnace bodies.
Furthermore, an alumina ceramic crucible is arranged in a heating furnace of the device.
Furthermore, the water mist cooling device of the device comprises an air outlet arranged on the conveying rod, and the air outlet cools the sample by water mist formed by air and water.
Has the advantages that: compared with the prior art, the utility model has the advantages that: the device can prepare the welding joint fine grain region of the large-size T/P92 steel sample (the size can reach 20cm x 2cm x 5cm), and the size of the prepared sample fine grain region can reach the size of the sample, namely the whole sample is the fine grain region after preparation, so that the subsequent high-temperature performance evaluation of the T/P92 steel fine grain region and the service life detection of the T/P92 steel welding joint are facilitated, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic view of the apparatus;
fig. 2 is a schematic structural diagram of the device.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.
The device for preparing the fine grain zone of the T/P92 steel welding joint comprises a propelling mechanism 3, a water mist quick cooling device 4, a preheating furnace 1 and a heating furnace 2, and is shown in figure 1. The preheating furnace 1 is arranged at the upper end of the heating furnace 2 and communicated with the heating furnace. The propelling mechanism 3 is arranged at the upper end of the preheating furnace 1 and realizes the up-and-down movement of the T/P92 steel sample. The water mist quick cooling device 4 is positioned between the propelling mechanism 3 and the preheating furnace 1, and realizes quick cooling of the T/P92 steel sample.
As shown in fig. 2, the propelling mechanism 3 includes a transmission rod 5 with a rack, a gear 6 engaged with the transmission rod 5, and a motor 7, preferably a servo motor, for driving the transmission rod 5 to move up and down by driving the gear 6 to rotate. The conveying rod 5 is provided with a conveying rod guide sleeve 11 for positioning the conveying rod, the bottom end of the conveying rod 5 is fixedly connected with a clamp 12, and the test is clamped through the clamp 12. The transfer rod 5 is fixed by a transfer rod holder 9 provided on the preheating furnace 1, and the motor 7 is fixed by a motor holder 10 provided on the transfer rod holder 9.
The water mist cooling device 4 comprises an air outlet 17 arranged on the conveying rod support 9, and the air compressor and the water channel are additionally arranged, so that the air compressor blows air and water to the sample through the air outlet 17, and the sample is rapidly cooled.
The preheating furnace 1 comprises a furnace body 13, a thermocouple 14 arranged on the furnace body 13 and a resistance wire 15 arranged in the furnace body 13. Similarly, the heating furnace 2 includes a furnace body 13, a thermocouple 14 disposed on the furnace body 13, and a resistance wire 15 disposed in the furnace body 13. An alumina ceramic crucible 16 is also arranged in the heating furnace 2, and liquid aluminum is arranged in the crucible 16.
In addition to the above, the apparatus further comprises a heat-resistant shutter 8 provided between the water mist cooling device 4 and the preheating furnace 1, and a heat-resistant shutter 8 provided between the preheating furnace 1 and the heating furnace 2. The heat-resisting movable baffle 8 is movable, a rack is arranged on one side of the heat-resisting movable baffle, and the heat-resisting movable baffle moves under the driving of the motor 7 through the meshing of the rack and the gear 6. Correspondingly, the top ends of the preheating furnace 1 and the heating furnace 2 are respectively provided with a guide rail for moving the heat-resisting movable baffle 8.
The method for preparing the fine grain region of the T/P92 steel welded joint by adopting the device comprises the following steps:
(1) clamping a sample at the bottom end of the conveying rod 5 through a clamp 12;
(2) the temperature of the preheating furnace 1 is increased to 650 ℃, the temperature of the heating furnace 2 is increased to 910-930 ℃, and the device is heated from 650 ℃ to 910-930 ℃ to realize rapid heating;
(3) controlling a motor 7 to open a heat-resistant movable baffle 8 of the preheating furnace 1, controlling the motor 7 to drive a transmission rod 5, moving the sample into the preheating furnace 1, and keeping the temperature for 0.5-1 h;
(4) controlling a motor 7 to drive a transmission rod 5, immersing the sample into the liquid aluminum in the alumina ceramic crucible 16, and keeping the temperature for 1-2 min;
(5) the control motor 7 drives the transmission rod 5 to move the sample to the water mist quick cooling device 4, and the control motor 7 closes a heat-resistant movable baffle 8 of the preheating furnace 1;
(6) and opening an air compressor, spraying water mist out of the air outlet 17, cooling the sample to room temperature, cooling to room temperature, taking out the sample, and cooling the sample to room temperature from 910-930 ℃, thereby realizing rapid cooling.
The prior austenite grain size of the P92 steel parent material adopted by the utility model is about 60 mu m, the prior austenite grain size of the fine crystal zone prepared by the method is only about 15 mu m, and the grain of the P92 steel is obviously refined after heat treatment, so that the heat affected zone of the welding joint of the T/P92 steel prepared by the method is effective.
Claims (8)
1. The utility model provides a preparation T/P92 steel welded joint fine grain region's device which characterized in that: the device comprises a preheating furnace (1) and a heating furnace (2) which are communicated up and down, a propelling mechanism (3) which is arranged above the preheating furnace (1) and used for propelling a sample to move, and a water mist cooling device (4) which is arranged between the propelling mechanism (3) and the preheating furnace (1) and used for cooling the sample; the propelling mechanism (3) comprises a transmission rod (5) connected with the sample, a gear (6) meshed with the transmission rod (5) and a motor (7) driving the transmission rod (5) to move.
2. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as set forth in claim 1, wherein: the device also comprises movable heat-resistant movable baffles (8) which are respectively arranged at the top end of the preheating furnace (1) and the top end of the heating furnace (2).
3. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as claimed in claim 2, wherein: baffle guide rails are arranged at the top end of the preheating furnace (1) and the top end of the heating furnace (2), racks are arranged on the side edges of the heat-resistant movable baffles (8), and the heat-resistant movable baffles are driven by the motor (7) to move through the engagement of the racks and the gear (6).
4. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as set forth in claim 1, wherein: the conveying rod (5) is fixedly connected to the preheating furnace (1) through a conveying rod support (9), and the motor (7) is fixedly connected to the conveying rod support (9) through a motor support (10).
5. The apparatus for preparing the fine grain zone of the T/P92 steel welded joint according to claim 4, wherein: the propelling mechanism (3) further comprises a conveying rod guide sleeve (11) which is arranged on the conveying rod support (9) and used for positioning the conveying rod (5), and the bottom end of the conveying rod (5) is fixedly connected with a sample through a set clamp (12).
6. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as set forth in claim 1, wherein: the preheating furnace (1) and the heating furnace (2) both comprise a furnace body (13), a thermocouple (14) arranged on the furnace body (13) and a resistance wire (15) arranged in the furnace body (13).
7. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as set forth in claim 6, wherein: an alumina ceramic crucible (16) is arranged in the heating furnace (2).
8. The apparatus for preparing the fine crystalline zone of the welded joint of T/P92 steel as set forth in claim 1, wherein: the water mist cooling device (4) comprises an air outlet (17) arranged on the conveying rod (5), and the water mist formed by air and water is used for cooling the sample through the air outlet (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908105.9U CN216082232U (en) | 2021-08-13 | 2021-08-13 | Device for preparing fine grain region of T/P92 steel welding joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121908105.9U CN216082232U (en) | 2021-08-13 | 2021-08-13 | Device for preparing fine grain region of T/P92 steel welding joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216082232U true CN216082232U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121908105.9U Active CN216082232U (en) | 2021-08-13 | 2021-08-13 | Device for preparing fine grain region of T/P92 steel welding joint |
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| Country | Link |
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| CN (1) | CN216082232U (en) |
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2021
- 2021-08-13 CN CN202121908105.9U patent/CN216082232U/en active Active
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