CN112159942A - Constant-elasticity alloy for anti-radiation sensor and preparation method thereof - Google Patents

Constant-elasticity alloy for anti-radiation sensor and preparation method thereof Download PDF

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CN112159942A
CN112159942A CN202010832390.4A CN202010832390A CN112159942A CN 112159942 A CN112159942 A CN 112159942A CN 202010832390 A CN202010832390 A CN 202010832390A CN 112159942 A CN112159942 A CN 112159942A
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李永友
王方军
刘海定
刘应龙
万红
程鹏
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Chongqing Materials Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
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    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
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    • C22B9/18—Electroslag remelting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

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Abstract

The invention relates to a constant elasticity alloy for an anti-radiation sensor and a preparation method thereof, wherein the alloy comprises the following components in percentage by weight: ni: 41.5-43.0%; cr: 4.90-5.75%; ti: 2.20-2.75%; al: 0.30-0.80%; c: less than or equal to 0.06 percent;mn: less than or equal to 0.80 percent; si: less than or equal to 1.00 percent; cr + (Ti-4 XC): 7.10-8.10%; not more than 0.15% of harmful elements, and P: less than or equal to 0.04 percent; s: less than or equal to 0.04 percent; fe: and (4) the balance. The irradiation performance of the alloy is as follows: the total 60-year cumulative dose in normal environment is 5.26 multiplied by 104Gy, accident environmental dose 2.5 × 105Gy (3 months after accident), low expansion coefficient, low non-metallic inclusion and small average grain size, and can be applied to precise sensor equipment for nuclear power engineering with special requirements and other precise instrument equipment with the requirements.

Description

Constant-elasticity alloy for anti-radiation sensor and preparation method thereof
Technical Field
The invention relates to a metal material, in particular to a constant-elasticity alloy for an anti-radiation sensor and a preparation method thereof.
Background
The constant-elasticity alloy is mainly characterized in that the elastic modulus or the resonant frequency of the constant-elasticity alloy changes little when the temperature changes around the room temperature, namely the constant-elasticity alloy has small elastic modulus or frequency temperature coefficient. The method is mainly applied to vibrators of mechanical filters, magnetostrictive delay lines, standard frequency elements, vibrating wires in sensors, vibrating cylinders, clocks, hairsprings of pressure measuring and force measuring instruments, bellows, suspension wires, corrugated pipes and the like. The constant-elasticity alloy is classified into a ferromagnetic constant-elasticity alloy and a nonmagnetic constant-elasticity alloy.
The current constant elasticity alloy has the following main alloy grades:
1 ferromagnetic constant-elasticity alloy
(1) Fe-Ni based alloy of constant elasticity
Typical designations are: 3J53 alloy. The main elements of the alloy are Ni 40-45%, Cr 5-6%, and the balance Fe. The alloy has wide application in the field of capacitance transmitters.
(2) Co-Fe-based constant-elasticity alloy
Typical designations are: a Co54Cr10Fe alloy. The main elements of the alloy are Ni 50-60%, Cr 6-15%, and the balance Fe. The alloy has wide application in corrosive environment.
2 non-magnetic constant-elasticity alloy
(1) Nb-based constant-elasticity alloy
Typical designations are: ti40Al5Nb alloy. The alloy mainly comprises Ti 37-41%, Al 4-7% and the balance of Nb. The alloy has wide application in the field with wide environmental temperature change.
(2) Pb-based constant-elasticity alloy
Typical designations are: au50Pb alloy. The main elements of the alloy are Au 45-55% and the balance of Pb. The alloy requires beta in some casesE、βGThe application is wide in the zero-trend occasions.
(3) Fe-Mn based alloy of constant elasticity
Typical designations are: mn31Fe alloy. The main elements of the alloy are Mn 28-33%, and the balance is Fe. The alloy has a transition point T to antiferromagneticNHas wide application in special occasions.
(4) Mn-based constant-elasticity alloy
Typical designations are: mn79Ni21 alloy. The main elements of the alloy are Ni 21% and Mn 79%. The alloy has a transition point T to antiferromagneticNAnd martensitic transformation temperature TmHas wide application in special occasions.
(5) Cr-based constant-elasticity alloy
Typical designations are: MnFe5Cr alloy. The main elements of the alloy are Mn0.9%, Fe5.1% and the rest is Cr. The alloy is widely applied to ultrasonic delay lines.
The nuclear power generation is related to the national civilization, higher requirements are put forward on nuclear power safety, and with the development of precise sensor equipment for nuclear power engineering with high precision and high performance requirements, a total accumulated dosage of 5.26 multiplied by 10 in the normal environment for 60 years is required4Gy, accident environmental dose 2.5 × 105Gy (3 months after accident) irradiation. At the same time, the alloy must meet the following performance requirements: mean linear expansion coefficient alpha(-45～+80)℃＝6.0～8.3×10-6The average grain size is 3.5 grade or finer per DEG C (aging state), the sum of the contents of non-metallic inclusions is not more than 3 grade, and the alloy environment use requirements meeting the requirements are not met in the market at present.
Disclosure of Invention
The invention aims to provide a constant-elasticity alloy for an anti-radiation sensor and a preparation method thereof aiming at the defects of the prior art, wherein the irradiation performance of the alloy is as follows: the total 60-year cumulative dose in normal environment is 5.26 multiplied by 104Gy, incident environmental doseIs 2.5 multiplied by 105Gy (3 months after accident), low expansion coefficient, low non-metallic inclusion and small average grain size, and can be applied to precise sensor equipment for nuclear power engineering with special requirements and other precise instrument equipment with the requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant elasticity alloy for an anti-radiation sensor comprises the following components in percentage by weight:
ni: 41.5-43.0%; cr: 4.90-5.75%; ti: 2.20-2.75%; al: 0.30-0.80%; c: less than or equal to 0.06 percent; mn: less than or equal to 0.80 percent; si: less than or equal to 1.00 percent; cr + (Ti-4 XC): 7.10-8.10%; not more than 0.15% of harmful elements, and P: less than or equal to 0.04 percent; s: less than or equal to 0.04 percent; fe: and (4) the balance.
The better technical scheme is that the alloy comprises the following components in percentage by weight: ni: 42.5-42.8%; cr: 5.5-5.6%; ti: 2.6-2.65%; al: 0.55-0.60%; c: 0.03-0.4%; mn: 0.4 percent; si: 0.4 percent; cr + (Ti-4 XC): 7.10-8.10%; not more than 0.15% of harmful elements, and P: less than or equal to 0.04 percent; s: less than or equal to 0.04 percent; fe: and (4) the balance.
The harmful elements comprise the following components in percentage by weight: co is less than or equal to 0.1 percent, B is less than or equal to 0.005 percent, N is less than or equal to 30ppm, O is less than or equal to 30ppm, H is less than or equal to 10ppm, wherein N + O + H is less than or equal to 60 ppm.
The preparation method of the constant-elasticity alloy for the radiation-proof sensor comprises the following steps of:
1) smelting
Taking all components of the constant-elasticity alloy for the anti-radiation sensor according to the proportion, and carrying out vacuum induction melting;
first refining
Adding a bottom material in the furnace: fe. Smelting Ni and Cr into molten steel at 1550-1600 deg.c and vacuum degree not more than 10Pa for 0.6-0.8 min/kg;
second refining
Adding other alloy elements into the furnace, fully stirring at 1500-1580 ℃, controlling the vacuum degree to be less than or equal to 5Pa after the alloy is completely melted, filling argon for protection, standing the molten steel, adjusting the temperature to 1450 ℃, and quickly pouring;
then electroslag remelting is carried out, CaF is adopted during remelting2-CaO2-Al2O3a-MgO quaternary slag system, wherein the remelting temperature is 1650-1750 ℃, and the remelting speed is 0.6-1.0 Kg/min;
carrying out thermal feeding by adopting a power decreasing method before finishing smelting, wherein the feeding current reduction rate is 0.0015KA/S, and obtaining an alloy steel ingot;
2) forging
The alloy steel ingot obtained in the step 1) is subjected to heat preservation for 60-120 minutes at the temperature of 1140-1160 ℃, the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 850 ℃, and the alloy steel ingot is forged into a square billet;
3) hot rolling
Step 2) forging the obtained square billet, preserving heat and hot-rolling the square billet into phi 52+2After mm bar stock, turning into phi 51+0.5mm bar, wherein the cold-drawn collet is turned to phi 39+1mm×120+20The mm is a circle slightly smaller than the size of a finished product;
4) solution treatment
Performing solution annealing treatment on the bar obtained in the step 3), wherein the temperature of the solution annealing treatment is 950-1050 ℃, the heat preservation time is 50-90 minutes, the heat preservation time is different according to the diameter of the bar, and the heat preservation time is calculated by increasing the diameter of each 25mm for 30 minutes, and performing water cooling;
5) cold drawing
And (4) further cold-drawing the alloy obtained in the step 4) into a bar material, wherein the deformation amount is 30-50%, and thus the constant-elasticity alloy for the anti-irradiation sensor is obtained.
The slag system CaF in the step 1)2：CaO2：Al2O3: the weight ratio of MgO is 75:10:10: 5.
The remelting current in the step 1) is 7 +/-0.5 KA, and the voltage is 50 +/-5V.
The diameter of the alloy steel ingot in the step 1) is phi 300 mm.
The square billet in the step 2) is 95+5mm×95+5mm.
The temperature of the heat preservation in the step 3) is 1140-1160 ℃, and the heat preservation time is 60-120 minutes.
The invention relates to a Fe-Ni alloy containing main elements such as Fe, Ni, Cr, Ti, Al and the like, and the beta of the Fe-Ni binary alloyEBeta. at Ni contents of 28% and 44%, as a function of the Ni contentE＝0。βEIs very sensitive to the composition (Ni content), and to reduce this sensitivity, Cr is added appropriately, beta being increased with the increase of Cr contentEBut the Fe-Ni-Cr ternary alloy is a single-phase austenite structure, has low strength, hardness and elastic modulus, and is strengthened by adopting an alloying method. The invention adopts intermetallic compound strengthening type, Ti and Al are added on the basis of Fe-Ni-Cr, and gamma' -Ni3(Ti, Al) phase is precipitated in the tempering process to strengthen the alloy.
The effect of each element in the alloy is as follows:
ni: the gamma solid solution is formed with Fe and Cr to form an abnormal basis of alloy elasticity, which has great influence on the constant elasticity of the alloy. Since it is the Ni content in gamma-solid solution that affects the constant elasticity, which depends on the original composition of the alloy and on the gamma' -Ni content during ageing3Degree of precipitation of (Ti, Al) phase. Minimum Ni content in gamma solid solution after aging (as Ni)γExpressed) can be calculated according to the following empirical formula:
Niγni total-5.76 (Al-0.5) -3.24(Ti-2.0) -3.705
Wherein, 0.5 percent and 2 percent respectively represent the solubility of Al and Ti in a gamma phase; the values of 5.76 and 3.24 are the ratios of Ni/Al and Ni/Ti in the gamma phase; 3.705 is the ratio of Ni/Ti in the eta phase.
Cr: mainly reduces the positive value of the elastic modulus temperature coefficient, and simultaneously, the addition of Cr in the alloy also reduces Tc and provides corrosion resistance.
Ti, Al: ti is generally present in such alloys at about 1%, dissolves in solid solutions and forms TiC with C, while the remainder forms γ '-Ni 3(Ti, Al) strengthening phases with Ni, Al to strengthen the alloy, and Ni γ is reduced by precipitation of γ' phase (1% Ti combined with 3.66 times Ni), resulting in β E changes. Al is also an element forming a γ' strengthening phase.
On the basis of main elements such as Fe, Ni, Cr, Ti, Al and the like and trace elements such as C, Si, Mn and the like, the alloy fully considers the influence rule of components on elastic modulus influence factors such as lambda, mu, kappa and the like, so that the alloy has a reasonable structure, namely, the alloy meets the processing performance and irradiation requirements of the alloy, and simultaneously, the alloy is ensured to have a lower expansion coefficient and lower nonmetallic inclusions.
Meanwhile, in order to improve the strength of the alloy, control the expansion coefficient of the alloy, improve the forging performance of the alloy and the like, a small amount of trace elements such as C, Si, Mn and the like are added for performance optimization, high-purity raw materials are adopted, a vacuum induction melting and electroslag remelting pure purification duplex metallurgical process technology is adopted, and harmful elements such as Co, B, N, H, O and the like are controlled, so that the alloy of the precise sensor equipment for nuclear power engineering with high precision and high performance requirements is obtained, and the alloy has good stability.
Compared with the existing highest-performance alloy of the same type, the alloy disclosed by the invention has good low-expansion performance, high purity and fine-grain metallographic structure, especially has radiation-proof performance meeting specific requirements, fills the blank of the constant-elasticity alloy in the area, and can solve the problem that other alloys cannot solve or cannot solve the problem well, thereby promoting the technical progress and industrial development of related industries, and the economic benefit and the social benefit are obvious.
Tests prove that the alloy disclosed by the invention has the following properties: mean linear expansion coefficient alpha(-45～+80)℃＝6.0～8.3×10-6/° c (age); average grain size of grade 3.5 or finer; the non-metallic inclusions are fine and uniform, and the total content is not more than 3 grades; irradiation performance: the total 60-year cumulative dose in normal environment is 5.26 multiplied by 104Gy, incident ambient dose 2.5 × 105Gy (3 months after accident).
Drawings
FIG. 1 is a pre-irradiation non-metallic inclusion grade (100X) of the alloy of the present invention;
FIG. 2 is a pre-irradiation microstructure topography (100X) of the alloy of the present invention;
FIG. 3 is a pre-irradiation coefficient of thermal expansion of an alloy according to the present invention;
FIG. 4 shows non-metallic inclusions (100X) after irradiation of the alloy of the present invention;
FIG. 5 is a microstructure topography (100X) of the alloy of the present invention after irradiation;
FIG. 6 is a graph of the microstructure of the alloy of the present invention after irradiation (500X);
FIG. 7 is a graph of the post-irradiation thermal expansion coefficient of the alloy of the present invention.
Detailed Description
The invention is further illustrated but is not intended to be limited thereby within the scope of the embodiments described.
Example 1
A constant elasticity alloy for an anti-radiation sensor comprises the following chemical components in percentage by weight: c: 0.03; si: 0.4; mn: 0.4; ni: 42.5; cr: 5.6; ti: 2.6; al: 0.6; the balance being Fe;
the constant-elasticity alloy for the anti-radiation sensor is prepared by the following method:
1) smelting
First refining
Adding a bottom material in the furnace: fe. Smelting Ni and Cr into molten steel at 1550-1600 deg.c and vacuum degree not more than 10Pa for 0.6-0.8 min/kg;
second refining
Adding the rest alloy elements into the furnace, fully stirring, controlling the vacuum degree to be less than or equal to 5Pa after the alloy is completely melted at the temperature of 1500-1580 ℃, filling argon for protection, standing the molten steel, adjusting the temperature to 1450 ℃, and quickly pouring;
then electroslag remelting is carried out, CaF is adopted during remelting2-CaO2-Al2O3-MgO ═ 75:10:10:5 (weight ratio) quaternary slag system;
remelting at 1650-1750 ℃, remelting at 0.6-1.0 Kg/min, controlling current at 7 +/-0.5 KA and voltage at 50 +/-5V, performing thermal feeding by adopting a power subtraction method before finishing smelting, wherein the reduction rate of feeding current is 0.0015KA/S, and obtaining an alloy steel ingot with the diameter of 300 mm;
2) forging
The alloy steel ingot obtained in the step 1) is arranged at 1140-1160 DEG CAnd (3) preserving the heat for 90 minutes at the temperature of the temperature, wherein the specific heat preservation time is determined by the size of the steel ingot. The open forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 850 ℃, and the forging temperature is 95 DEG C+5mm ×95+5A square billet of mm;
3) hot rolling
Step 2) forging of the resulting 95+5mm×95+5mm square billet is hot-rolled into phi 52 after the heat preservation temperature is 1140-1160 ℃ and the heat preservation time is 60 minutes+2After mm bar stock, turning into phi 51+0.5mm bar, wherein the cold-drawn collet is turned to phi 39+ 1mm×120+20mm；
4) Solution treatment
The alloy solution annealing treatment temperature is 950-1050 ℃, the heat preservation time is 60 minutes, and water cooling is carried out;
5) cold drawing
And (3) cold-drawing the alloy into a bar material, wherein the deformation amount of the bar material is 38%, so that the constant-elasticity alloy for the radiation-proof sensor is obtained.
Example 2:
a constant elasticity alloy for an anti-radiation sensor comprises the following chemical components in percentage by weight: c: 0.04; si: 0.4; mn: 0.4; ni: 42.8 of the total weight of the powder; cr: 5.5; ti: 2.65 of; al: 0.55; the balance being Fe; the produced alloy ingot is processed into an alloy material by hot processing and cold processing, and is applied to the manufacturing of a cup body material of a sensor.
The preparation method is the same as example 1.
The alloy obtained in example 1-2 was used for the following tests:
chemical composition
The test results are shown in tables 1 and 2 after the detection of a mechanical industrial instrument material product quality supervision and detection center and Chongqing Material research institute Co.
TABLE 1
Element(s) Index requirement Before irradiation After irradiation Developing an alloy proof
Ni 41.5～43.0 41.31 42.51 42.27
Cr 4.90～5.75 5.48 5.38 5.35
Ti 2.20～2.75 2.48 2.56 2.46
Al 0.30～0.80 0.438 0.433 0.61
C ≤0.06 0.023 0.026 0.016
Mn ≤0.80 0.365 0.391 0.37
Si ≤1.00 0.393 0.413 0.38
P ≤0.04 0.0005 0.0005 0.0054
S ≤0.04 0.0005 0.0005 0.01
Cr+(Ti-4×C) 7.10～8.10 7.868 7.836 7.746
Co ≤0.1 0.062 0.058 0.022
B ≤0.005 0.0047 0.0039 0.0024
Fe Balance of Balance of Balance of Balance of
TABLE 2 gas element detection results
Element(s) N O H N+O+H
Project index requirements ≤30ppm ≤30ppm ≤10ppm ≤60ppm
Before irradiation 14 18 3.7 35.7
After irradiation 12 18 0.9 30.9
Developing an alloy proof 18 9 1.7 28.7
Second, mechanical properties
The test results are shown in Table 3 after the test of the quality supervision and detection center of the mechanical industrial instrument material products and Chongqing Material research institute Co.
TABLE 3 mechanical Property test results
Figure BDA0002638463950000101
Three, other performance indexes
The test results are shown in table 4, the non-metallic inclusion before irradiation is shown in fig. 1, the microstructure before irradiation is shown in fig. 2, the thermal expansion coefficient before irradiation is shown in fig. 3, the non-metallic inclusion after irradiation is shown in fig. 4, the microstructure after irradiation is shown in fig. 5 and fig. 6, and the thermal expansion coefficient after irradiation is shown in fig. 7.
Table 4 results of other performance tests
Figure BDA0002638463950000102
And (4) conclusion:
experiments prove that the alloy disclosed by the invention has the following properties: mean linear expansion coefficient alpha(-45～+80)℃＝6.0～ 8.3×10-6/° c (age); average grain size of grade 3.5 or finer; the non-metallic inclusions are fine and uniform, and the total content is not more than 3 grades; irradiation performance: the total 60-year cumulative dose in normal environment is 5.26 multiplied by 104Gy, incident ambient dose 2.5 × 105Gy (3 months after accident). (Note: in the experiment, accelerated irradiation aging is adopted, and the total accumulated dose in normal environment for 60 years is 5.26 multiplied by 104Gy, dose rate is 1K Gy/h, and accident environment dose is 2.5 multiplied by 105Gy (3 months after accident), dose rate was 10 kGy/h. )

Claims (10)

1. The constant-elasticity alloy for the radiation-resistant sensor is characterized by comprising the following components in percentage by weight:
ni: 41.5-43.0%; cr: 4.90-5.75%; ti: 2.20-2.75%; al: 0.30-0.80%; c: less than or equal to 0.06 percent; mn: less than or equal to 0.80 percent; si: less than or equal to 1.00 percent; cr + (Ti-4 XC): 7.10-8.10%; not more than 0.15% of harmful elements, and P: less than or equal to 0.04 percent; s: less than or equal to 0.04 percent; fe: and (4) the balance.
2. The alloy of claim 1, wherein the alloy comprises the following components in weight percent: ni: 42.5-42.8%; cr: 5.5-5.6%; ti: 2.6-2.65%; al: 0.55-0.60%; c: 0.03-0.4%; mn: 0.4 percent; si: 0.4 percent; cr + (Ti-4 XC): 7.10-8.10%; not more than 0.15% of harmful elements, and P: less than or equal to 0.04 percent; s: less than or equal to 0.04 percent; fe: and (4) the balance.
3. The alloy of claim 1 or 2, wherein the harmful elements are present in the following weight percentages: co is less than or equal to 0.1 percent, B is less than or equal to 0.005 percent, N is less than or equal to 30ppm, O is less than or equal to 30ppm, H is less than or equal to 10ppm, wherein N + O + H is less than or equal to 60 ppm.
4. The preparation method of the constant-elasticity alloy for the radiation-resistant sensor is characterized by comprising the following steps of:
1) smelting
Taking the components according to the proportion of claim 1 or 2, and carrying out vacuum induction melting;
first refining
Adding a bottom material in the furnace: fe. Smelting Ni and Cr into molten steel at 1550-1600 deg.c and vacuum degree not more than 10Pa for 0.6-0.8 min/kg;
second refining
Adding other alloy elements into the furnace, fully stirring at 1500-1580 ℃, controlling the vacuum degree to be less than or equal to 5Pa after the alloy is completely melted, filling argon for protection, standing the molten steel, adjusting the temperature to 1450 ℃, and quickly pouring;
then electroslag remelting is carried out, CaF is adopted during remelting2-CaO2-Al2O3a-MgO quaternary slag system, wherein the remelting temperature is 1650-1750 ℃, and the remelting speed is 0.6-1.0 Kg/min;
carrying out thermal feeding by adopting a power decreasing method before finishing smelting, wherein the feeding current reduction rate is 0.0015KA/S, and obtaining an alloy steel ingot;
2) forging
The alloy steel ingot obtained in the step 1) is subjected to heat preservation for 60-120 minutes at the temperature of 1140-1160 ℃, the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 850 ℃, and the alloy steel ingot is forged into a square billet;
3) hot rolling
Step 2), forging to obtain a square billet, performing heat preservation, performing hot rolling to obtain a bar, and turning, wherein the cold drawing chuck is turned into a round shape with the size slightly smaller than that of a finished product;
4) solution treatment
Carrying out solution annealing treatment on the bar obtained in the step 3), wherein the temperature of the solution annealing treatment is 950-1050 ℃, the heat preservation time is 50-90 minutes, and cooling with water;
5) cold drawing
And (4) further cold-drawing the alloy obtained in the step 4) into a bar material, wherein the deformation amount is 30-50%, and thus the constant-elasticity alloy for the anti-irradiation sensor is obtained.
5. The method of claim 4, wherein: the slag system CaF in the step 1)2：CaO2：Al2O3: the weight ratio of MgO is 75:10:10: 5.
6. The method of claim 4, wherein: the remelting current in the step 1) is 7 +/-0.5 KA, and the voltage is 50 +/-5V.
7. The method of claim 4, wherein: the diameter of the alloy steel ingot in the step 1) is phi 300 mm.
8. The method of claim 4, wherein: the square billet in the step 2) is 95+5mm ×95+5mm。
9. The method of claim 4, wherein: the temperature of the heat preservation in the step 3) is 1140-1160 ℃, and the heat preservation time is 60-120 minutes.
10. The method of claim 4, wherein: and 4) increasing the heat preservation time by 30 minutes per 25mm according to the diameter of the bar in the solution annealing.
CN202010832390.4A 2020-08-18 2020-08-18 Constant-elasticity alloy for anti-radiation sensor and preparation method thereof Pending CN112159942A (en)

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