CN104032232B - A kind of anti-oxidant resistance to liquid lead bismuth corrodes low activation martensite heat-resistant steel - Google Patents
A kind of anti-oxidant resistance to liquid lead bismuth corrodes low activation martensite heat-resistant steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 105
- 239000010959 steel Substances 0.000 title claims abstract description 105
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 62
- 239000007788 liquid Substances 0.000 title claims abstract description 32
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 29
- 230000004913 activation Effects 0.000 title claims abstract description 23
- 230000003078 antioxidant effect Effects 0.000 title claims abstract description 19
- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 17
- 235000006708 antioxidants Nutrition 0.000 title claims abstract description 17
- 238000005275 alloying Methods 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
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- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
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- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 23
- 229910052715 tantalum Inorganic materials 0.000 claims description 20
- 229910052720 vanadium Inorganic materials 0.000 claims description 20
- 229910052804 chromium Inorganic materials 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 229910052748 manganese Inorganic materials 0.000 claims description 13
- 238000005496 tempering Methods 0.000 claims description 13
- 229910052721 tungsten Inorganic materials 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 25
- 238000005260 corrosion Methods 0.000 abstract description 25
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 15
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 5
- 239000011651 chromium Substances 0.000 description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 239000000463 material Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 19
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- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 239000000470 constituent Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000004992 fission Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052596 spinel Inorganic materials 0.000 description 3
- 239000011029 spinel Substances 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
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Abstract
A kind of anti-oxidant resistance to liquid lead bismuth is the object of the present invention is to provide to corrode low activation martensite heat-resistant steel, the per-cent that its alloying element accounts for total mass is: 0.09%≤C≤0.12%, 8.8%≤Cr≤9.2%, 1.48%≤W≤1.54%, 0.17%≤V≤0.23%, 0.12%≤Ta≤0.16%, 0.48≤Mn≤0.50%, 0.40%≤Si≤0.80%, N < 0.010%, Al < 0.010%, Ni < 0.005%, Mo < 0.005%, Nb < 0.010%, Co < 0.005%, Ti & lt, 0.010%, Cu < 0.010%, O & lt, 0.005%, P & lt, 0.005%, S & lt, 0.005%, matrix is Fe.This high temperature steel has excellent mechanical property, hot properties, anti-oxidation characteristics and resistance to liquid metal corrosion performance.
Description
Technical field
The invention belongs to heat-resisting resistance to irradiation metal material field, be specifically related to a kind of anti-oxidant resistance to liquid lead bismuth corrosion (LBE) low activation martensitic steel being applicable to fusion reactor, strong neutron irradiation can be resisted, resistance to high temperature oxidation, and the eutectic of resistance to liquid lead bismuth corrosion.
Background technology
Along with the aggravation of energy dilemma, exploitation safety, the green novel energy source that energy density is high become the main direction of mankind's energy development.Nuclear energy (nuclear fusion energy and nuclear fission energy) is the most promising clean energy.Compared to nuclear fission energy, nuclear fusion power plants can not produce carbon, and the radioactivity byproduct generated is also less than current nuclear fission power station, and storage method is simpler.Owing to being subject to the acting in conjunction that high temperature, stress, neutron irradiation and liquid-metal coolant wash away when structural part in fusion reactor is on active service, this requires that the structural wood materials and parts of fusion reactor must possess excellent high temperature resistant, Flouride-resistani acid phesphatase, anti-liquid metal corrosion performance and low activation feature simultaneously.For the low activation problem of the structured material in fusion reactor, the world generally adopts low activating element W, and V, Ta replace the easily-activated elements Mo in script fission-type reactor structured material, Ni, Nb.Easily-activated elements Mo, the induced radioactivity nucleic transformation period that Ni, Nb produce after neutron irradiation reaches 44 years respectively, 7.6 ten thousand years, 20,000 years.These Long-lived Radionuclides through neutron irradiation generation are that the nuclear waste disposal in later stage brings stern challenge.In addition, because of the characteristic such as high thermal conductivity, low melting point, high boiling point, low-steam pressure of liquid lead bismuth eutectic, it is used as the reactive system loop of fusion reactor and the refrigerant of covering by countries in the world design, simultaneously because its excellent neutronics characteristic and radiation hardness are also designed the high-energy neutron target target being used as accelerator-driven sub-critical system.In the reactive system of fusion reactor, the alloying element part in the structured material directly contacted with liquid lead bismuth can be dissolved in liquid lead bismuth, causes structured material top layer alloying element content to change, and produces serious oxidation corrosion; In addition, liquid lead bismuth circulates in cooling loop, and the oxide film more weak with basal body binding force can be washed and peel off, and causes inner metal to continue oxidation corrosion occurs.Therefore require that fusion reactor structured material not only needs to possess good mechanical property, also need at high temperature possess the over-all propertieies such as good structure stability, antioxidant property and resistance to liquid metal corrosion.The low activation martensite heat-resistant steel of modified 9-12%Cr is because possessing excellent mechanical property, high temperature microstructure stability, and high temperature oxidation resistance and become fusion reactor preferred material.T/P91, T/P92 is as steel grade comparatively ripe in 9-12% chromium martensitic high temperature steel, can suitability for industrialized production, and be widely used in overcritical with ultra supercritical thermal power station steam conveying pipe, and possess good anti-air or steam oxidation performance, but its poor-performing of resistance to liquid metal corrosion, cannot be applied in the system such as fusion reactor and ADS Accelerator Driven Subcritical heap.Therefore, grasp the several crucial country of nuclear technique in the world, as the U.S., Russia, France, Britain, Japan, Germany, India, all on the basis of 9-12% chromium martensitic high temperature steel, research and development are applicable to the new structural material of following fusion reactor and ADS Accelerator Driven Subcritical heap, and China is also in the blank stage in the research and development field of this type of material.Research team of the present invention is optimized alloy composition on the basis of 9-12% chromium martensitic high temperature steel, and by adjustment alloying element content and thermal treatment process, materials microstructure of optimizing structure, thus obtain good anti-liquid lead bismuth corrosive nature.。
The present invention proposes a kind of resistance to oxidation resistance to liquid lead bismuth corrosion (LBE) low activation martensite heat-resistant steel being applicable to fusion reactor, it possesses excellent mechanical property, hot properties, Flouride-resistani acid phesphatase embrittlement characteristic and anti-liquid lead bismuth corrosive property, can meet the service requirements of the first wall of plasma body faced by nuclear fusion stack and the hash target structure material of ADS Accelerator Driven Subcritical heap.And in the prior art, patent documentation 1 (application number 200610085908.2) provides the martensitic structure material in close with the present invention, same field.Although this martensitic structure material has good anti-neutron irradiation performance, it does not consider the performance that anti-liquid lead bismuth is corroded.In addition, in this patent documentation, do not mention the Si adding 0.4-0.8% in martensitic steel, improve its anti-liquid lead bismuth corrosive nature.
Summary of the invention
The object of the present invention is to provide a kind of anti-oxidant resistance to liquid lead bismuth corrosion (LBE) low activation martensitic steel being applicable to fusion reactor, it has excellent high temperature oxidation resistance, anti-liquid lead bismuth corrosive nature and anti-neutron irradiation performance.The present invention is on the basis of patent documentation 1, and the content of the key elements such as adjustment C, Mn, Si, Cr, by controlling the influence factor that delta ferrite generates, obtaining single full martensitic stucture, improving obdurability; Add the elements such as Ta, V and realize low activation characteristic; And adopt Ta, V microalloy treatment, improve its hot properties; Particularly design and the Si element adding reasonable content to improve resistance to liquid metal corrosion performance, finally make steel grade of the present invention have excellent mechanical property, hot properties, anti-oxidation characteristics and resistance to liquid metal corrosion performance.Because not having analogous material as a reference, the maximum difficult point of material development of the present invention is its component system, thermal treatment process and organizational controls.According to the calculation formula of Cr equivalent, after adding Si element, the Cr equivalent of martensitic steel changes greatly, and it is comparatively complicated that component system becomes, and very easily occurs delta ferrite.In addition, in the present invention, also proposed the thought controlling steel alloy tissue with Cr equivalent, establish the contact between steel alloy chemical composition and microstructure.
The present invention specifically provides a kind of anti-oxidant resistance to liquid lead bismuth corrosion (LBE) low activation martensite heat-resistant steel being applicable to fusion reactor, it is characterized in that, the per-cent that the alloying element of described martensite heat-resistant steel accounts for total mass is: 0.09%≤C≤0.12%, 8.8%≤Cr≤9.2%, 1.48%≤W≤1.54%, 0.17%≤V≤0.23%, 0.12%≤Ta≤0.16%, 0.48≤Mn≤0.50%, 0.4%≤Si≤0.8%, matrix is Fe; Strict control can produce the easily-activated constituent content of radionuclide after neutron irradiation, require as follows: N < 0.010%, Al < 0.010%, Ni < 0.005%, Mo < 0.005%, Nb < 0.010%, Co < 0.005%, Ti<0.010%, Cu < 0.010%; Other customary impurities constituent contents require as follows: O<0.005%, P<0.005%, S<0.005%.
Anti-oxidant resistance to liquid lead bismuth of the present invention corrodes low activation martensite heat-resistant steel, it is characterized in that, the optimum composition proportion of alloying element of described martensitic steel is: 0.095%C, 8.96%Cr, 1.51%W, 0.21%V, 0.14%Ta, 0.49%Mn, 0.6%Si, matrix is Fe.
Anti-oxidant resistance to liquid lead bismuth of the present invention corrodes low activation martensite heat-resistant steel, it is characterized in that, the Cr equivalent calculation formula of described high temperature steel is netCreq (pct)=Cr+2Si+1.5Mo+0.75W+5V+1.75Nb+5.5Al+1.5Ti-0.691 (Ni+Co+0.5Mn+0.3Cu+25N+30C+3Ta), and Cr equivalent≤10%, be organized as single martensitic stucture.
Anti-oxidant resistance to liquid lead bismuth of the present invention corrodes low activation martensite heat-resistant steel under high temperature air condition, and Surface Creation has the rich Cr oxide film of densification of protectiveness; In liquid Pb-Bi eutectic after corrosion, Surface Creation has the bilayer structure oxide film of protectiveness, and its skin is the Fe of rich Fe
3o
4oxidation film layer, internal layer is the spinel structure dense oxidation film of rich Si and Cr.
Present invention also offers the heat treating method that described anti-oxidant resistance to liquid lead bismuth corrodes low activation martensite heat-resistant steel, it is characterized in that, the heat treating regime of described martensite heat-resistant steel is: normalizing 900-1150 DEG C/30-35min/ air cooling+tempering 700-850 DEG C/90-120min/ air cooling.Optimum heat treating regime is: normalizing 950-1100 DEG C/30-35min/ air cooling+tempering 760-800 DEG C/90-120min/ air cooling.
The present invention is based on the consideration of the aspects such as the mechanical property to Structural Materials for Fusion Reactors, low activation characteristic, anti-oxidation characteristics and anti-liquid lead bismuth corrosive nature, provide a kind of anti-oxidant resistance to liquid lead bismuth and corrode low activation martensite heat-resistant steel, in described high temperature steel, the content of each element is as follows with effect:
Content be 0.1% C element can form M with alloying elements such as Cr, V, Ta
23c
6or MX type carbide, produce precipitation strength, make high temperature steel obtain good hot strength, and can ensure that hardening capacity that steel is good is to obtain whole martensitic stucture.Content be 9% Cr element be the main interpolation alloying element improving antioxidant property in high temperature steel, itself and oxygen are combined in the Cr of the Surface Creation densification of high temperature steel
2o
3film or FeCr
2o
4spinel structure oxide film, stops oxygen and matrix to react further, reaches anti-oxidant and erosion-resisting object.Content be 0.6% Si element significantly can improve the antioxidant anticorrosive performance of high temperature steel, improve the density of oxide film, intercept the infiltration of liquid metal, thus improve the resistance to liquid metal corrosion performance of high temperature steel.Content be 0.49% Mn element can improve the consistency of high temperature steel and liquid lead bismuth metal, also significantly can reduce Ac1 temperature and the martensite start temperature of steel, suppress the formation of delta ferrite, ensure that matrix is single martensitic stucture.If there is delta ferrite in martensitic steel, delta ferrite intensity is low and delta ferrite/martensitic boundary strength is more weak, and this will cause the toughness of material and intensity all poor; In addition, with martensitic phase ratio, more easily there is oxidation and corrosion in delta ferrite, and the resistance of oxidation of martensitic steel and resistance to liquid metal corrosion ability are reduced.Content be 1.5% W element can suppress the alligatoring of carbide, improve the high temperature creep property of high temperature steel, obtain excellent mechanical behavior under high temperature.Content be 0.21% V element there is strong carbon solidification effect, slow down the alligatoring of carbide, V generates nano-sized carbonitride in the base in addition, effectively can control dislocation motion, improves the high temperature creep property of high temperature steel.Content be 0.14% Ta element can be combined with carbon, nitrogen and generate MX type nano-sized carbonitride, these precipitated phases at high temperature have excellent thermostability, can effective pinning dislocation.W, V, Ta are low activating elements, material can be made to possess low reactivity energy, thus meet the service requirements of fusion reactor structured material.In addition, for impurity element, particularly the easily-activated element such as N, Ni, Mo, Ni, Co, Cu will strictly control; P is easy in grain boundaries segregation in the base, reduces the toughness of high temperature steel; S easily forms MnS with Mn in the base and is mingled with, thus the toughness of reduction material and plasticity.
The invention has the advantages that, improve the resistance to liquid metal corrosion performance that traditional chromium content is the martensite heat-resistant steel of 9-12%.The present invention adjusts the constituent content control Cr equivalents such as C, Mn, Si, thus suppresses delta ferrite to generate, and the full martensitic stucture that final acquisition is single improves obdurability; Add the elements such as Ta, V and realize low activation characteristic; And adopt Ta, V microalloy treatment, improve its hot properties; With the addition of a certain amount of Si element to improve resistance to liquid metal corrosion performance, finally make steel grade of the present invention have excellent mechanical property, hot properties, anti-oxidation characteristics and resistance to liquid metal corrosion performance.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 2 martensitic steel metallographic structure figure.
Fig. 2 is the stereoscan photograph after the embodiment of the present invention 2 martensitic steel 700 DEG C of air constant temperature oxidation 500h.
Fig. 3 is the corrosion layer cross-section morphology after the embodiment of the present invention 2 martensitic steel corrodes 500h hour in the plumbous bismuth of 600 DEG C of saturated oxygen concentration liquid.
Embodiment
The present invention is described in detail by the following examples, wherein all embodiment steel and comparative example steel forge through same process, rolling process, the tensile property under its heat treatment state of last test and impact property.
Embodiment 1
The chemical composition of martensitic steel is: C:0.090wt.%, Cr:8.95wt.%, W:1.50wt.%, V:0.20wt.%, Ta:0.14wt.%, Mn:0.50wt.%, Si:0.59wt.%, Al<0.005wt.%, N:50 (ppm), Ni:40 (ppm), Mo:40 (ppm), Nb:43 (ppm), Co:40 (ppm), Ti:33 (ppm), Cu<0.01wt.%, O:42 (ppm), P:48 (ppm), S:26 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 950-1100 DEG C/30min/ air cooling+tempering 760-800 DEG C/100min/ air cooling.
Embodiment 2
The chemical composition of martensitic steel is: C:0.095wt.%, Cr:8.96wt.%, W:1.51wt.%, V:0.21wt.%, Ta:0.14wt.%, Mn:0.49wt.%, Si:0.60wt.%, Al<0.005wt.%, N:50 (ppm), Ni:40 (ppm), Mo:40 (ppm), Nb:43 (ppm), Co:48 (ppm), Ti:33 (ppm), Cu<0.010wt.%, O:42 (ppm), P:48 (ppm), S:26 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 950-1100 DEG C/30min/ air cooling+tempering 760-800 DEG C/100min/ air cooling.
Embodiment 3
The chemical composition of martensitic steel is: C:0.093wt.%, Cr:9.04wt.%, W:1.48wt.%, V:0.18wt.%, Ta:0.12wt.%, Mn:0.48wt.%, Si:0.53wt.%, Al<0.010wt.%, N:36 (ppm), Ni:42 (ppm), Mo:44 (ppm), Nb:40 (ppm), Co:40 (ppm), Ti:27 (ppm), Cu<0.010wt.%, O:42 (ppm), P:40 (ppm), S:36 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 950-1100 DEG C/30min/ air cooling+tempering 760-800 DEG C/100min/ air cooling.
Comparative example 1
The chemical composition of martensitic steel is: C:0.086wt.%, Cr:8.89wt.%, W:1.54wt.%, V:0.18wt.%, Ta:0.11wt.%, Mn:0.48wt.%, Si:0.35wt.%, Al<0.005wt.%, N:52 (ppm), Ni:36 (ppm), Mo:42 (ppm), Nb:50 (ppm), Co:30 (ppm), Ti:40 (ppm), Cu<0.01wt.%, O:48 (ppm), P:43 (ppm), S:24 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 950-1100 DEG C/30min/ air cooling+tempering 760-800 DEG C/100min/ air cooling.
Comparative example 2
The chemical composition of martensitic steel is: C:0.092wt.%, Cr:9.00wt.%, W:1.48wt.%, V:0.21wt.%, Ta:0.14wt.%, Mn:0.49wt.%, Si:0.87wt.%, Al<0.005wt.%, N:61 (ppm), Ni:30 (ppm), Mo:44 (ppm), Nb:42 (ppm), Co:37 (ppm), Ti:46 (ppm), Cu<0.01wt.%, O:40 (ppm), P:30 (ppm), S:26 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 950-1100 DEG C/30min/ air cooling+tempering 760-800 DEG C/100min/ air cooling.
Comparative example 3
The chemical composition of martensitic steel is identical with embodiment 2 composition, wherein C:0.095wt.%, Cr:8.96wt.%, W:1.51wt.%, V:0.21wt.%, Ta:0.14wt.%, Mn:0.49wt.%, Si:0.60wt.%, Al<0.005wt.%, N:50 (ppm), Ni:40 (ppm), Mo:40 (ppm), Nb:43 (ppm), Co:40 (ppm), Ti:33 (ppm), Cu<0.010wt.%, O:42 (ppm), P:48 (ppm), S:26 (ppm), surplus is iron.
The final heat treating regime of this martensitic steel is: normalizing 1180 DEG C/30min/ air cooling+tempering 870 DEG C/100min/ air cooling.
Comparative example 4
The chemical composition of martensitic steel is: C:0.093wt.%, Cr:8.96wt.%, W:1.51wt.%, V:0.20wt.%, Ta:0.14wt.%, Mn:0.50wt.%, Al<0.010wt.%, N:73 (ppm), Ni:35 (ppm), Mo:49 (ppm), Nb:48 (ppm), Co:36 (ppm), Ti:50 (ppm), Cu<0.01wt.%, O:40 (ppm), P:30 (ppm), S:48 (ppm), surplus is iron.The chemical composition of comparative example 4 steel, in the steel grade chemical composition ratio range described in patent documentation 1, with above-mentioned all embodiments compared with comparative example composition of steel, does not add Si alloying element.
The final heat treating regime of this martensitic steel is: normalizing 980 DEG C/30min/ air cooling+tempering 760 DEG C/100min/ air cooling.
Table 1 embodiment and the mechanical property of comparative example steel at room temperature and 600 DEG C
Table 1 is mechanical properties and the room temperature impact toughness test data of embodiment and comparative example steel.Can find out, Si content and V, W, Ta alloying element content all have impact to intensity and toughness.Embodiment 1,2,3 hardness of steel and plasticity are more or less the same, but the ballistic work of embodiment 2 steel is compared with the ballistic work height 25J of embodiment 1,3 steel.The intensity of embodiment 1,2 steel exceeds about 25MPa compared with the intensity of comparative example 1 steel, but both impelling strength is more or less the same; Meanwhile, the intensity of embodiment 1,2,3 steel is compared with the low about 20MPa of the intensity of comparative example 2 steel, but its impelling strength is significantly better than comparative example 2 steel; The comprehensive mechanical property of visible embodiment steel is generally better than comparative example 1,2 steel.Consider, intensity and the plasticity and toughness of embodiment 2 steel are optimum.In addition, the mechanical property of heat treating regime to high temperature steel also has a great impact.In the identical situation of chemical composition (embodiment 2 steel and comparative example 3 steel), the interval higher limit of the more optimum normalizing temperature of normalizing temperature of comparative example 3 steel is high 30 DEG C, and the interval higher limit of the more optimum tempering temperature of tempering temperature is high 20 DEG C, but the strength degradation of comparative example 3 steel about 55MPa, impact toughness decreased 91J.Visible, embodiment 2 Heat Treatment Of Steel system is better than comparative example 3 Heat Treatment Of Steel system.Comparative example 4 steel is the one of martensitic steel described in patent documentation 1, does not add Si element, but the intensity of comparative example 4 steel is compared with the low 30-40MPa of intensity of embodiment 1,2,3 steel, and impact property and embodiment steel are more or less the same.
Fig. 1 is the metallographic structure photo of embodiment 2 steel, and as seen from the figure, embodiment 1 steel obtains single martensitic stucture, and this shows the microstructure that effectively can be controlled steel by adjustment constituent content control Cr equivalent.
Fig. 2 is the stereoscan photograph of embodiment 2 steel after 700 DEG C of air constant temperature oxidation 500h.As seen from the figure, the oxidation-resistance property of embodiment 2 steel is better, the fine and close Cr of protectiveness that what Surface Creation 5 μm was thick have
2o
3oxide film.
Fig. 3 is the corrosion layer cross-section morphology after embodiment 2 steel corrodes 500h in the plumbous bismuth of 600 DEG C of saturated oxygen concentration liquid.As seen from the figure, embodiment 2 steel generates 15 μm of thick bilayer structure oxide films with protectiveness through liquid lead bismuth corrosion rear surface, its skin is the Fe of rich Fe
3o
4oxidation film layer, internal layer is the FeCr of rich Si, Cr
2o
4spinel structure dense oxidation film.
Result shows, the present invention by constituent content control Cr equivalents such as adjustment C, Mn, Si, thus suppresses delta ferrite to generate, and finally obtains single full martensitic stucture, improves obdurability; Add the elements such as Ta, V and realize low activation characteristic; And adopt Ta, V microalloy treatment, improve its hot properties; With the addition of a certain amount of Si element to improve resistance to liquid metal corrosion performance, finally make steel grade of the present invention have excellent mechanical property, hot properties, anti-oxidation characteristics and resistance to liquid metal corrosion performance.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. an anti-oxidant resistance to liquid lead bismuth corrodes low activation martensite heat-resistant steel, it is characterized in that, the per-cent that the alloying element of martensitic steel accounts for total mass is: 0.09%≤C≤0.12%, 8.8%≤Cr≤9.2%, 1.48%≤W≤1.54%, 0.17%≤V≤0.23%, 0.12%≤Ta≤0.16%, 0.48≤Mn≤0.50%, 0.40%≤Si≤0.80%, N < 0.010%, Al < 0.010%, Ni < 0.005%, Mo < 0.005%, Nb < 0.010%, Co < 0.005%, Ti<0.010%, Cu < 0.010%, O<0.005%, P<0.005%, S<0.005%, Fe surplus,
Cr equivalent≤10% of described steel;
Cr equivalent calculation formula is: netCreq (pct)=Cr+2Si+1.5Mo+0.75W+5V+1.75Nb+5.5Al+1.5Ti-0.691 (Ni+Co+0.5Mn+0.3Cu+25N+30C+3Ta).
2. corrode low activation martensite heat-resistant steel according to resistance to liquid lead bismuth anti-oxidant described in claim 1, it is characterized in that the per-cent that the alloying element of described martensitic steel accounts for total mass is: 0.095%C, 8.96%Cr, 1.51%W, 0.21%V, 0.14%Ta, 0.49%Mn, 0.6%Si, matrix is Fe.
3. one kind corrodes the heat treating method of low activation martensite heat-resistant steel according to resistance to liquid lead bismuth anti-oxidant described in claim 1, it is characterized in that, the heat treating regime of described martensitic steel is: normalizing 900-1150 DEG C/30-35min/ air cooling+tempering 700-850 DEG C/90-120min/ air cooling.
4. the heat treating method of low activation martensite heat-resistant steel is corroded according to resistance to liquid lead bismuth anti-oxidant described in claim 3, it is characterized in that, the heat treating regime of described martensitic steel is: normalizing 950-1100 DEG C/30-35min/ air cooling+tempering 760-800 DEG C/90-120min/ air cooling.
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| CN109609849A (en) * | 2018-12-28 | 2019-04-12 | 西安交通大学 | One kind low activation martensitic steel containing Si and its heat treatment method |
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| CN114959548B (en) * | 2022-05-23 | 2024-05-07 | 中国科学院金属研究所 | Method for improving lead (lead bismuth) corrosion resistance of ferrite/martensitic steel through pre-oxidation treatment |
| CN115612926B (en) * | 2022-09-19 | 2023-08-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Ferrite/martensite heat-resistant steel for lead-bismuth pile and preparation method thereof |
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