CN107587080A - A kind of precipitation strength heat resisting steel and its preparation technology - Google Patents
A kind of precipitation strength heat resisting steel and its preparation technology Download PDFInfo
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- CN107587080A CN107587080A CN201710965439.1A CN201710965439A CN107587080A CN 107587080 A CN107587080 A CN 107587080A CN 201710965439 A CN201710965439 A CN 201710965439A CN 107587080 A CN107587080 A CN 107587080A
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Abstract
A kind of precipitation strength heat resisting steel and its preparation technology, alloying component meet following area requirement by mass percentage：C：0.03 0.06%, Ni：6 10%, Cr：8 13%, Al：1.5 2.4%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%, surplus Fe；By the alloy melting of preparation into alloy mother liquor, alloy cast ingot is finally prepared to；By alloy cast ingot in 850 1100 DEG C of scope roll forming sheet materials；By the sheet material after rolling by solution treatment, Ageing Treatment, precipitation strength heat resisting steel is obtained.While the heat resisting steel of the present invention has excellent in strength performance, there is good Toughness.Alloy At Room Temperature tensile strength is not less than 1000MPa, and yield strength is more than 900MPa, and room temperature elongation percentage is higher than 12%, and the contraction percentage of area is higher than 50%.
Description
Technical field
The invention belongs to metal material field, and in particular to a kind of precipitation strength heat resisting steel and its preparation technology.
Background technology
High martensitic chromium heat resisting steel obtains extensive use because of its cheap cost and excellent performance.Higher chromium
Content ensures that alloy possesses good anti-oxidant, corrosion resistance, further ensure that alloy makes under harsh working condition
Use performance.Further to improve alloy mechanical property, there is research to attempt to add Ni, Al element into alloy recently, pass through promotion
The formation of the NiAl phases of small and dispersed in alloy, and alloy is obtained more preferably mechanical property.However, when alloying level is higher
When, often cause high temperature ferrite to be formed, and the ductile-brittle transition temperature of alloy is improved simultaneously, under causing alloy plasticity drastically
Drop, alloy performance is formed and had a strong impact on.Current result of study thinks that the addition of Al elements influences to show on alloy plasticity
Write, a small amount of Al elements addition can cause alloy ductile-brittle transition temperature to improve rapidly.Therefore, Al element content does not surpass typically
Cross 1%.
The content of the invention
It is an object of the invention to provide a kind of precipitation strength heat resisting steel and its preparation technology, and adjust simultaneously alloy into
Divide, and combine rational processing and Technology for Heating Processing, amplitude peak reduces alloy ductile-brittle transition temperature, so that alloy acquisition is good
Good intensity matches with plasticity.
In order to realize above goal of the invention, the technical solution adopted in the present invention is：
A kind of precipitation strength heat resisting steel, alloying component meet following area requirement by mass percentage：C：0.03-
0.06%, Ni：6-10%, Cr：8-13%, Al：1.5-2.4%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%, surplus is
Fe。
Further improve of the invention is that alloying component meets following area requirement by mass percentage：C：0.05-
0.06%, Ni：6%, Cr：8.5-11%, Al：2%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%, surplus Fe；
A kind of preparation technology of precipitation strength heat resisting steel, comprises the following steps：
1) alloyage：Alloying component meets following area requirement by mass percentage：C：0.03-0.06%, Ni：6-
10%, Cr：8-13%, Al：1.5-2.4%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%, surplus Fe；
2) melting step：By the alloy melting of preparation into alloy mother liquor, alloy cast ingot is finally prepared to；
3) high temperature hot rolling：By alloy cast ingot in 850-1100 DEG C of scope roll forming sheet material；
4) alloy is heat-treated：By the sheet material after rolling by solution treatment, Ageing Treatment, precipitation strength heat resisting steel is obtained.
Further improve of the invention is, melting is carried out using vaccum sensitive stove in step 2).
Further improve of the invention is that the vacuum of vaccum sensitive stove is not higher than 5 × 10-3MPa。
Further improve of the invention is, alloy cast ingot is prepared into using negative pressure casting technique in step 2).
Further improve of the invention is, when being rolled in step 3), every time rolling pushes deflection not less than 30%,
Deflection is not less than 70% after the completion of rolling.
Further improve of the invention is that the temperature of solution treatment is 1050-1200 DEG C, and the time is 0.5-2 hours.
Further improve of the invention is that the temperature of Ageing Treatment is 700-780 DEG C, and the time is 8-24 hours.
Compared with prior art, the device have the advantages that：
The present invention improves higher Ni, Al content on the basis of 9-12Cr alloys, so promoting small and dispersed in alloy
NiAl phases separate out；C element content is reduced to reduce influence of the chromium carbide roughening to alloy property；Cancel the ferrites such as W, Mo to be formed
The addition of element, to reach the purpose for reducing alloy ductile-brittle transition temperature.
The alloy prepared by the method for the invention possesses good combination property and structure stability, prolonged heat exposure bar
Precipitate size change is little under part.Alloy average grain size 80-160 microns, it is mainly double by martensite and reversed austenite
Mutually form, wherein Martensite Volume Fraction is not less than 60%.Alloy separates out big after Ageing Treatment in intra-die even dispersion
The spherical NiAl phases of fine size are measured, precipitated phase average-size is no more than 70nm, and its volume fraction is not less than 10%.Alloy has
While having excellent in strength performance, there is good Toughness.Alloy At Room Temperature tensile strength is not less than 1000MPa, and surrender is strong
Degree is more than 900MPa, and room temperature elongation percentage is higher than 12%, and the contraction percentage of area is higher than 50%.The alloy adapts to be used for supercritical thermal power machine
Group turbo blade, can also be applied to the fields such as aerospace, nuclear reactor and petrochemical industry, such as aircraft components, reactor component and oil
Frock is standby etc..
Embodiment
The present invention is described in further detail with reference to embodiment.
The present invention relates to a kind of high alumina martensitic stain less steel.
Embodiment 1
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：
2%, Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：2%, Co：
3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove 5 × 10 are not higher than in vacuum-3Under MPa by the alloy melting of preparation into
Alloy mother liquor, alloy cast ingot is finally prepared into using negative pressure casting technique.
3) high temperature hot rolling：By alloy cast ingot, in 1050 DEG C of roll forming sheet materials, rolling, every time rolling reduction is not low
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 2
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：
2%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：2%, Nb：
0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove 5 × 10 are not higher than in vacuum-3Under MPa by the alloy melting of preparation into
Alloy mother liquor, alloy cast ingot is finally prepared into using negative pressure casting technique.
3) high temperature hot rolling：By alloy cast ingot in 1050 DEG C of roll forming sheet materials, rolling, every time rolling reduction is not low
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 3
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：
2%, Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：2%, Co：
3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove 5 × 10 are not higher than in vacuum-3Under MPa by the alloy melting of preparation into
Alloy mother liquor, alloy cast ingot is finally prepared into using negative pressure casting technique.
3) high temperature hot rolling：By alloy cast ingot, in 1050 DEG C of roll forming sheet materials, rolling, every time rolling reduction is not low
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Comparative example 1
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：
1%, Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：8.5%, Al：1%, Co：
3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove by the alloy melting of preparation into alloy mother liquor, finally using negative pressure casting
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling：Alloy cast ingot is not less than 30% in 1050 DEG C of roll forming sheet materials, every time rolling reduction,
Final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 2
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：1%,
Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：1%, Co：
3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove by the alloy melting of preparation into alloy mother liquor, finally using negative pressure casting
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling：Alloy cast ingot is not less than 30% in 1050 DEG C of roll forming sheet materials, every time rolling reduction,
Final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 3
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：3%,
Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：11%, Al：3%, Co：
3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove by the alloy melting of preparation into alloy mother liquor, finally using negative pressure casting
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling：Alloy cast ingot is not less than 30% in 1050 DEG C of roll forming sheet materials, every time rolling reduction,
Final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 4
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.05%, Ni：6%, Cr：13%, Al：3%,
Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：Composition includes by mass percentage：C：0.05%, Ni：6%, Cr：13%,
Al：3%, Co：3%, Nb：0.06%, Zr：0.05%, surplus Fe.
2) melting step：Using vaccum sensitive stove by the alloy melting of preparation into alloy mother liquor, finally using negative pressure casting
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling：Alloy cast ingot is not less than 30% in 1050 DEG C of roll forming sheet materials, every time rolling reduction,
Final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1050 DEG C of solution treatment 2 hours air cooling, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Referring to table 1, the alloy property of embodiment and comparative example is tested respectively.From result, embodiment is closed
Gold utensil is for good comprehensive strength and toughness.When Al content is relatively low in alloy, intensity is substantially poor, and toughness has no significantly
Improve.And when Al content is too high, alloy ductility drastically declines.
The alloy mechanical property test result of table 1
Embodiment 4
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.03%, Ni：8%, Cr：8%, Al：
1.5%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：By mentioned component alloyage raw material.
2) melting step：Using vaccum sensitive stove 5 × 10 are not higher than in vacuum-3Under MPa by the alloy melting of preparation into
Alloy mother liquor, alloy cast ingot is finally prepared into using negative pressure casting technique.
3) high temperature hot rolling：By alloy cast ingot, in 850 DEG C of roll forming sheet materials, rolling, every time rolling reduction is not less than
30%, final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1100 DEG C of solution treatment 2 hours air cooling, then at 700 DEG C
Effect 20 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 5
The heat-resisting steel material of the present embodiment, includes by mass percentage：C：0.06%, Ni：10%, Cr：13%, Al：
2.4%, Co：1%, Nb：0.01%, surplus Fe.
The preparation method of the present embodiment comprises the following steps：
1) raw material is prepared：According to mentioned component alloyage raw material；
2) melting step：Using vaccum sensitive stove 5 × 10 are not higher than in vacuum-3Under MPa by the alloy melting of preparation into
Alloy mother liquor, alloy cast ingot is finally prepared into using negative pressure casting technique.
3) high temperature hot rolling：By alloy cast ingot, in 1100 DEG C of roll forming sheet materials, rolling, every time rolling reduction is not low
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated：By the sheet material after rolling after 1200 DEG C of solution treatment 0.5 hour air cooling, then at 750 DEG C
Timeliness 8 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
In the present invention after the completion of solution treatment, alloy average grain size 80-160 microns, mainly by martensite and inversion
Austenitic duplex is formed, and wherein Martensite Volume Fraction is not less than 60%.
Alloy separates out the spherical NiAl phases of a large amount of fine sizes after Ageing Treatment, in intra-die even dispersion, separates out
Phase average size is no more than 70nm, and its volume fraction is higher than 10%.
Alloy At Room Temperature tensile strength is not less than 1000MPa, and yield strength is higher than 12% more than 900MPa, room temperature elongation percentage,
The contraction percentage of area is higher than 50%.
Claims (8)
1. a kind of precipitation strength heat resisting steel, it is characterised in that alloying component meets following area requirement by mass percentage：C：
0.03-0.06%, Ni：6-10%, Cr：8-13%, Al：1.5-2.4%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%,
Surplus is Fe.
2. a kind of preparation technology of precipitation strength heat resisting steel, it is characterised in that comprise the following steps：
1) alloyage：Alloying component meets following area requirement by mass percentage：C：0.03-0.06%, Ni：6-10%,
Cr：8-13%, Al：1.5-2.4%, Co：≤ 3%, Nb：≤ 0.1%, Zr：≤ 0.1%, surplus Fe；
2) melting step：Adopt the alloy melting of preparation into alloy mother liquor, be finally prepared to alloy cast ingot；
3) high temperature hot rolling：By alloy cast ingot in 850-1100 DEG C of scope roll forming sheet material；
4) alloy is heat-treated：By the sheet material after rolling by solution treatment, Ageing Treatment, precipitation strength heat resisting steel is obtained.
3. the preparation technology of a kind of precipitation strength heat resisting steel according to claim 2, it is characterised in that used in step 2)
Vaccum sensitive stove carries out melting.
4. the preparation technology of a kind of precipitation strength heat resisting steel according to claim 3, it is characterised in that vaccum sensitive stove
Vacuum is not higher than 5 × 10-3MPa。
5. the preparation technology of a kind of precipitation strength heat resisting steel according to claim 2, it is characterised in that used in step 2)
Negative pressure casting technique is prepared into alloy cast ingot.
6. the preparation technology of a kind of precipitation strength heat resisting steel according to claim 2, it is characterised in that rolled in step 3)
When, every time rolling pushes deflection not less than 30%, and deflection is not less than 70% after the completion of rolling.
A kind of 7. preparation technology of precipitation strength heat resisting steel according to claim 2, it is characterised in that the temperature of solution treatment
Spend for 1050-1200 DEG C, the time is 0.5-2 hours.
A kind of 8. preparation technology of precipitation strength heat resisting steel according to claim 2, it is characterised in that the temperature of Ageing Treatment
Spend for 700-780 DEG C, the time is 8-24 hours.
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Cited By (4)
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| SE2050144A1 (en) * | 2020-02-11 | 2021-08-12 | Blykalla Reaktorer Stockholm Ab | A martensitic steel |
| CN113699465A (en) * | 2021-08-26 | 2021-11-26 | 华能国际电力股份有限公司 | Ferrite-based high-strength corrosion-resistant dual-phase alloy and preparation method thereof |
| CN113981328A (en) * | 2021-09-18 | 2022-01-28 | 四川大学 | Aluminum-containing austenitic stainless steel with surface spontaneously and continuously generating aluminum oxide film |
| SE2150379A1 (en) * | 2021-03-29 | 2022-07-19 | Blykalla Reaktorer Stockholm Ab | An overlay welding material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE2050144A1 (en) * | 2020-02-11 | 2021-08-12 | Blykalla Reaktorer Stockholm Ab | A martensitic steel |
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| CN113699465A (en) * | 2021-08-26 | 2021-11-26 | 华能国际电力股份有限公司 | Ferrite-based high-strength corrosion-resistant dual-phase alloy and preparation method thereof |
| CN113981328A (en) * | 2021-09-18 | 2022-01-28 | 四川大学 | Aluminum-containing austenitic stainless steel with surface spontaneously and continuously generating aluminum oxide film |
| CN113981328B (en) * | 2021-09-18 | 2022-05-24 | 四川大学 | Aluminum-containing austenitic stainless steel with surface spontaneously and continuously generating aluminum oxide film and preparation method thereof |
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