CN108018503A - A kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel and preparation method thereof - Google Patents
A kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel and preparation method thereof Download PDFInfo
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
A kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel and preparation method thereof, utilize microstructure hereditary phenomenon of the initial martensitic structure in two-phase section heating process, the ferrite and austenite structure with lath feature are obtained after two-phase section heats, refined tissue, more boundaries are introduced into material at the same time, so as to accelerate crystal grain segmentation process in the operation of rolling, promote crystal grain refinement, material is subjected to air-cooled or water quenching to room temperature after heating makes AUSTENITE GRAIN COARSENING in high temperature first in preparation process and obtains martensitic structure, material is reheated to A again1‑A3Between a certain temperature carry out two-phase section heating, insulation, then multi- pass rolling is carried out, it is accumulative to roll lower amount between 40 70%, roll rear material and carry out air-cooled or Water Quenching, present invention process is simple, controllability is strong, can significantly reduce the rolling reduction of ultra-fine crystal two-phase steel preparation process, while can prepare the ultra-fine crystal two-phase steel of heavy in section size.
Description
Technical field
The invention belongs to prepare ultra-fine grained ferrite/martensite dual-phase steel technical field, more particularly to a kind of stratiform is ultra-fine
Brilliant dual phase ferritic/martensite steel and preparation method thereof.
Background technology
Dual phase steel has excellent mechanics and processing performance in auto industry extensive use, energy saving to loss of weight to play weight
Act on.The performance of dual phase steel depends primarily upon ferrite and martensite two-phase proportion, only relies on composition design and process modification
Limited to its performance boost, crystal grain refinement is considered as to solve the problems, such as this effective means, for example, Dierk Raabe et al.
(“Deformation and fracture mechanisms in fine-and ultrafine-grained ferrite/
martensite dual-phase steels and the effect of aging,Acta Materialia,2011.59
(2):P.658-670 crystal grain ") is refined to 1.2 μm by 12.4 μm, material yield strength is improved to 525MPa by 445MPa, is resisted
Tensile strength is improved to 1037MPa by 870MPa.At present, the preparation method of the ultra-fine crystal two-phase steel of document report be divided into one-step method and
Two-step method.Mukherjee is based on deformation-induced ferrite transformation principle and proposes that one-step method prepares ultra-fine crystal two-phase steel, and uses and be somebody's turn to do
Technique is by crystal grain refinement to 1 μm or so (" Grain Refinement in Dual-Phase Steels, Metallurgical＆
Materials Transactions A,2009.40(9):p.2145-2159”and“Critical Comparison of
Novel and Conventional Processing for Dual-Phase Steels,Materials&
Manufacturing Processes,2007.22(4):p.511-515”)；Xu Haiwei et al. (" fine grains based on dynamic phase trasnsition
Two-phase mild steel organizational controls, Acta Metallurgica Sinica, 2006.42 (10):") and South Korea scholar Hong et al. p.1101-1108
(“Influence of deformation induced ferrite transformation on grain refinement
of dual phase steel,Materials Science&Engineering A,2002.323(1):P.148-159 ")
This method is respectively adopted by crystal grain refinement to 2-4 μm；(" 700MPa is with the ultra-fine crystal two-phase steel of higher level's low cost hot rolling by Dong Yi et al.
Exploitation, steel product quality control technology, shape, dimensional accuracy, quality control on the surface with improve scientific seminar, 2010 ") herein
Develop Nb micro-alloying technologies on the basis of technology, improved recrystallization temperature, be conducive to deformation-induced ferrite transformation
Produce.The ultra-fine crystal two-phase steel of document report is prepared using two-step method more, its technical process is divided into large plastometric set crystal grain thinning
Quenched with two-phase section Short Time Heating and obtain two steps of duplex structure, wherein laminated rolling (" Characteristics of
plastic deformation by rotary-die equal-channel angular pressing,Scripta
Materialia,2005.52(6):P.433-437 "), high pressure torsion (" The mechanism of formation of
nanostructure and dissolution of cementite in a pearlitic steel during high
pressure torsion,Acta Materialia,2003.51(18):The channel pressings such as p.5555-5570 "),
(“Ultrafine grained ferrite–martensite dual phase steels fabricated via equal
channel angular pressing:Microstructure and tensile properties,Acta
Materialia,2005.53(11):P.3125-3134 "), cold rolling (" Formability of High Strength Dual-
phase Steels,Steel Research International,2006.77(9):P.654-667 "), cold forging
(“Structure–property optimization of ultrafine-grained dual-phase steels
using a microstructure-based strain hardening model,Acta Materialia,2007.55
(7):") and large deformation warm-rolling (" 1 μm of on strength of Effect of grain refinement to p.2337-2350
and toughness of dual-phase steels,Materials Science&Engineering A,2010.527
(29–30):") etc. p.7832-7840 technology is often used for crystal grain refinement, can be effectively by crystal grain refinement by this method
To 1 μm or so.
Although above-mentioned two classes method can effectively prepare ultra-fine crystal two-phase steel, these methods are from practical application farther out.
Technology of Deformation Induced Ferrite Transformation requires rolling mill practice extremely stringent, it is desirable to big deflection, high rate of deformation and rolls
Postcooling speed, industrialized production still difficulties.Large deformation+two-phase section Short Time Heating quenching technical can only prepare section ruler
Very little less Ultra-fine Grained dual-phase steel material, the reason is that the larger amount of plastic deformation of the process calls, the final size of sample compared with
It is small；On the other hand, the material in two-phase section heating process after large deformation can only Short Time Heating with ensure obtain ultra-fine grain, if
Material section size is larger, and Short Time Heating cannot make center portion material austenitizing, can not obtain duplex structure.Therefore, work is developed
It is ultra-fine crystal two-phase steel technical field that skill is simple, adapts to the ultra-fine crystal two-phase steel technology of preparing of heavy in section size of industrialized production
Key technique problem.
The content of the invention
In order to overcome above technological deficiency, object of the present invention is to provide a kind of stratiform Ultra-fine Grained dual phase ferritic/
Martensite steel and preparation method thereof, solves the problems, such as to prepare high tough Ultra-fine Grained dual phase steel, tool in Low Carbon Mn-Si-Cr Ferritic/Bainitic steel
There is ultra-fine grained ferrite/martensitic structure of Lamellar character, while the strength of materials, elongation percentage improve, impact flexibility obtains
Significantly improve.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel, the component by weight hundred of layered ultra-fine crystal two-phase steel
Ratio is divided to be calculated as：C:0.15-0.25%, Cr:0.5-2.0%, Mn:1.5-3.0%, Si:0.7-2.50%, P：<0.05%, S：<
0.06%, surplus Fe.
The stratiform Ultra-fine Grained two-phase steel organization is：Ferrite and martensite are alternately distributed in stratiform, and ferrite is in etc.
Shaft-like, average grain size are about 1 μm, and the volume fraction of martensite is 10-50%, and martensite bar thickness is 0.2-2 μm, geneva
Body silver spacing is 0.2-2 μm.
The ultra-fine crystal two-phase steel of stratiform ballistic work (A in -196 DEG C~80 DEG C temperature rangesKV) it is more than 138J, and
Occurs tough sexual abnormality rise phenomenon in -60 DEG C~0 DEG C temperature range, highest ballistic work is more than 258J.
A kind of preparation method of stratiform Ultra-fine Grained dual phase ferritic/martensite steel, comprises the following steps：Low-carbon Mn-Si-Cr
It is that composition of steel (wt.%) by weight percentage is calculated as：C:0.15-0.25%, Cr:0.5-2.0%, Mn:1.5-3.0%, Si:
0.7-2.50%, P：<0.05%, S：<0.06%, surplus Fe；Low Carbon Mn-Si-Cr Ferritic/Bainitic steel is heated to 900-1200 DEG C, is obtained
To austenite, and 0.5-2h is kept the temperature, make homogeneity of austenite component and make grain coarsening, then air-cooled or water quenching to room temperature, obtains
To lath martensite tissue；
Lath martensite tissue is reheated to A again1-A3Between a certain temperature carry out two-phase section heating 0.5-3h, obtain
Ferrite/austenite structure with lath feature；
Then gained ferrite/austenite structure is subjected to multi- pass rolling in 550-700 DEG C of temperature range, it is accumulative to roll
Lower amount rolls rear material and carries out air-cooled or Water Quenching between 40-70%；It can obtain stratiform Ultra-fine Grained dual phase ferritic/horse
Family name's body steel.
The component of layered ultra-fine crystal two-phase steel is by weight percentage：C:0.15-0.25%, Cr:0.5-
2.0%, Mn:1.5-3.0%, Si:0.7-2.50%, P：<0.05%, S：<0.06%, surplus Fe.
The stratiform Ultra-fine Grained two-phase steel organization prepared after preparation method processing is：Ferrite and martensite are handed in stratiform
For distribution, ferrite in etc. shaft-like, average grain size be about 1 μm, the volume fraction of martensite is 10-50%, martensite bar
Thickness is 0.2-2 μm, and martensite silver spacing is 0.2-2 μm.
The ultra-fine crystal two-phase steel of prepared stratiform ballistic work (A in -196 DEG C~80 DEG C temperature rangesKV) it is more than 138J, and
And occurring tough sexual abnormality rise phenomenon in -60 DEG C~0 DEG C temperature range, highest ballistic work is more than 258J.
Beneficial effects of the present invention：
The method have the characteristics that the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel for being used to prepare the ultra-fine crystal two-phase steel of stratiform need to have substantially
Structure Inheritance feature, martensitic structure obtained ferrite and austenite structure after two-phase section heating have martensite lath
Feature, while two-phase section heating after obtain austenite there is enough stability, Austria does not occur in the subsequent operation of rolling
Family name's body is changed into martensitic structure to pearlite or ferritic transformation during roller repairing.In addition, this technology invention with it is big
Deformation+two-phase section Short Time Heating quenching, which prepares ultra-fine crystal two-phase steel technique, to be compared and also has the characteristics that：A) system can be significantly reduced
The deformation quantity of standby ultra-fine crystal two-phase steel, it is not necessary to which very big deflection carrys out crystal grain thinning；B) it is double can to prepare Ultra-fine Grained for a step process
Xiang Gang, it is not necessary to two-phase section heating quenching after rolling；C) the ultra-fine crystal two-phase steel of heavy in section size can be prepared, solves heavy in section ruler
Technical barrier prepared by very little ultra-fine crystal two-phase steel.By this method prepare stratiform Ultra-fine Grained Mechanical Properties of Dual Phase Steels be：Rp0.2
>=750MPa, Rm >=1300MPa, A >=12%, ballistic work (A in -196 DEG C~80 DEG C temperature rangesKV) it is more than 138J, and-
Occurs tough sexual abnormality rise phenomenon in 60 DEG C~0 DEG C temperature range, highest ballistic work is more than 258J.
Brief description of the drawings
The ultra-fine crystal two-phase steel rolling mill practice schematic diagram of Fig. 1 stratiforms.
The ultra-fine crystal two-phase steel SEM tissues of Fig. 2 stratiforms.
The ultra-fine crystal two-phase steel TEM tissues of Fig. 3 stratiforms.
Embodiment
The present invention is described in further details below by embodiment.
The present invention implementation steps be：Low Carbon Mn-Si-Cr Ferritic/Bainitic steel is heated to 900-1200 DEG C first and keeps the temperature 0.5-
2h, makes homogeneity of austenite component and makes grain coarsening, then air-cooled or water quenching to room temperature, obtains lath martensite tissue；Again
Martensitic structure is reheated to A1-A3Between a certain temperature carry out two-phase section heating, keep the temperature 0.5-3h, utilize geneva
Microstructure hereditary phenomenon in body tissue two-phase section heating process obtains the ferrite/austenite structure with lath feature, makes group
Knit and refined, while more boundaries are introduced into material, accelerate crystal grain segmentation process in subsequent rolling process；Then
Multi- pass rolling is carried out in 550-700 DEG C of temperature range, it is accumulative to roll lower amount between 40-70%, carry out air-cooled or water after rolling
Quench processing, you can obtain the ultra-fine grained ferrite/martensitic structure with Lamellar character, technological process is as shown in Figure 1.In this hair
Ferrite and martensitic phase in the ultrafine-grained (UFG) microstructure prepared can be adjusted in bright implementation process by regulating and controlling two-phase section heating-up temperature
Ratio.
Embodiment 1
Selecting chemical composition, (wt.%) is by weight percent：0.17C, 1.5Mn, 1.5Si, 1.0Cr, 0.02P,
0.032S, surplus are the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of Fe.Its A is measured using differential thermal analysis (DSC) method3And A1Temperature is respectively
820.2 DEG C and 745.4 DEG C.Water quenching is to room temperature after the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of the component is heated to 1050 DEG C of insulation 1.5h；
The martensite steel is heated to again to carry out warm-rolling at 650 DEG C after 800 DEG C of insulation 1h, it is accumulative to roll lower amount 50%, it is air-cooled to room after rolling
Temperature, obtains 10mm thick-layer shape Ultra-fine Grained dual phase sheet steels, Martensite Volume Fraction is about 40.6%, ferrite average grain size
0.98 μm, SEM and TEM tissues difference are as shown in Figures 2 and 3.Its mechanical property is：Rp0.2：836MPa, Rm：1432MPa, A:
15.8%, room temperature impact work((AKV) it is 139.8J, -20 DEG C of ballistic works are 258.7J, and -196 DEG C of ballistic works are 138J.
Embodiment 2
Selecting chemical composition, (wt.%) is by weight percent：0.23C, 2.0Mn, 1.5Si, 0.5Cr, 0.023P,
0.046S, surplus are the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of Fe.Its A is measured using differential thermal analysis (DSC) method3And A1Temperature is respectively
813.4 DEG C and 716.7 DEG C.Room temperature is air-cooled to after the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of the component is heated to 1150 DEG C of insulation 2h；Again
The martensite steel is heated to carry out warm-rollings at 700 DEG C after 760 DEG C of insulation 2h, it is accumulative to roll lower amount 50%, rear water quenching is rolled to room temperature,
20mm thick-layer shape Ultra-fine Grained dual phase sheet steels are obtained, Martensite Volume Fraction is about 30%, 1.12 μm of ferrite average grain size.
Its mechanical property is：Rp0.2：873MPa, Rm：1538MPa, A:14.1%, room temperature impact work((AKV) it is 159.3J, -20 DEG C are rushed
It is 271.4J to hit work(,
Embodiment 3
Selecting chemical composition, (wt.%) is by weight percent：0.15C, 2.5Mn, 1.0Si, 1.0Cr, 0.036P,
0.051S, surplus are the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of Fe.Its A is measured using differential thermal analysis (DSC) method3And A1Temperature is respectively
803.7 DEG C and 701.7 DEG C.Room temperature is air-cooled to after the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of the component is heated to 1200 DEG C of insulation 0.5h；
The martensite steel is heated to again to carry out warm-rolling at 700 DEG C after 760 DEG C of insulation 2.5h, it is accumulative to roll lower amount 70%, it is air-cooled to after rolling
Room temperature, obtains 3mm thick-layer shape Ultra-fine Grained dual phase sheet steels, Martensite Volume Fraction is about 35%, ferrite average grain size
0.86μm.Its mechanical property is：Rp0.2：763MPa, Rm：1362MPa, A:18.7%, room temperature impact work((AKV) it is 203.8J ,-
20 DEG C of ballistic works are 351.2J,
Embodiment 4
Selecting chemical composition, (wt.%) is by weight percent：0.25C, 2.5Mn, 1.5Si, 1.0Cr, 0.037P,
0.031S, surplus are the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of Fe.Its A is measured using differential thermal analysis (DSC) method3And A1Temperature is respectively
790.6 DEG C and 733.3 DEG C.Room temperature is air-cooled to after the Low Carbon Mn-Si-Cr Ferritic/Bainitic steel of the component is heated to 950 DEG C of insulation 2h；Again will
The martensite steel carries out warm-rolling at 700 DEG C after being heated to 750 DEG C of insulation 2.5h, accumulative to roll lower amount 70%, and room temperature is air-cooled to after rolling,
3mm thick-layer shape Ultra-fine Grained dual phase sheet steels are obtained, Martensite Volume Fraction is about 20%, 0.81 μm of ferrite average grain size.
The present invention is using the microstructure hereditary phenomenon in initial martensitic structure two-phase section heating process, after two-phase section heats
The ferrite and austenite structure with lath feature are obtained, is refined tissue, while is introduced more into material
Boundary, so as to accelerate crystal grain segmentation process in the operation of rolling, promotes crystal grain refinement, significantly reduces ultra-fine crystal two-phase steel and prepares
The rolling reduction of process, while solve the preparation problem of the ultra-fine crystal two-phase steel of heavy in section size.Obtain special with stratiform
Ultra-fine grained ferrite/martensitic structure of sign, while the strength of materials, elongation percentage improve, impact flexibility is improved significantly.
Claims (7)
1. a kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel, it is characterised in that the component of the ultra-fine crystal two-phase steel of stratiform is by weight
Amount percentage (wt.%) is calculated as：C:0.15-0.25%, Cr:0.5-2.0%, Mn:1.5-3.0%, Si:0.7-2.50%, P：<
0.05%, S：<0.06%, surplus Fe.
2. a kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel according to claim 1, it is characterised in that described
Stratiform Ultra-fine Grained two-phase steel organization is：Ferrite and martensite are alternately distributed in stratiform, the shaft-like such as ferrite is in, average crystal grain ruler
Very little about 1 μm, the volume fraction of martensite is 10-50%, and martensite bar thickness is 0.2-2 μm, and martensite silver spacing is
0.2-2μm。
3. a kind of stratiform Ultra-fine Grained dual phase ferritic/martensite steel according to claim 1, it is characterised in that described
The ultra-fine crystal two-phase steel of stratiform ballistic work (A in -196 DEG C~80 DEG C temperature rangesKV) it is more than 138J, and in -60 DEG C~0 DEG C temperature
Occurs tough sexual abnormality rise phenomenon in the range of degree, highest ballistic work is more than 258J.
4. a kind of preparation method of stratiform Ultra-fine Grained dual phase ferritic/martensite steel, it is characterised in that comprise the following steps：It is low
Carbon Mn-Si-Cr systems composition of steel (wt.%) by weight percentage is calculated as：C:0.15-0.25%, Cr:0.5-2.0%, Mn:1.5-
3.0%, Si:0.7-2.50%, P：<0.05%, S：<0.06%, surplus Fe；Low Carbon Mn-Si-Cr Ferritic/Bainitic steel is heated to 900-
1200 DEG C, austenite is obtained, and keeps the temperature 0.5-2h, makes homogeneity of austenite component and makes grain coarsening, then air-cooled or water quenching
To room temperature, lath martensite tissue is obtained；
Lath martensite tissue is reheated to A again1-A3Between a certain temperature carry out two-phase section heating 0.5-3h, had
Ferrite/austenite structure of lath feature；
Then gained ferrite/austenite structure is subjected to multi- pass rolling in 550-700 DEG C of temperature range, it is accumulative to roll lower amount
Between 40-70%, roll rear material and carry out air-cooled or Water Quenching；It can obtain stratiform Ultra-fine Grained dual phase ferritic/martensite
Steel.
5. a kind of preparation method of stratiform Ultra-fine Grained dual phase ferritic/martensite steel according to claim 4, its feature exist
In the component of layered ultra-fine crystal two-phase steel is by weight percentage：C:0.15-0.25%, Cr:0.5-2.0%, Mn:
1.5-3.0%, Si:0.7-2.50%, P：<0.05%, S：<0.06%, surplus Fe.
6. a kind of preparation method of stratiform Ultra-fine Grained dual phase ferritic/martensite steel according to claim 4, its feature exist
In the stratiform Ultra-fine Grained two-phase steel organization is：Ferrite and martensite are alternately distributed in stratiform, the shaft-like such as ferrite is in,
Average grain size is about 1 μm, and the volume fraction of martensite is 10-50%, and martensite bar thickness is 0.2-2 μm, martensite bar
Piece spacing is 0.2-2 μm.
7. a kind of preparation method of stratiform Ultra-fine Grained dual phase ferritic/martensite steel according to claim 4, its feature exist
In the ultra-fine crystal two-phase steel of stratiform ballistic work (A in -196 DEG C~80 DEG C temperature rangesKV) it is more than 138J, and -60
DEG C~0 DEG C of temperature range in there is tough sexual abnormality rise phenomenon, highest ballistic work is more than 258J.
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| CN113801984A (en) * | 2020-06-15 | 2021-12-17 | 中国科学院金属研究所 | Plastic deformation processing technology for synchronously improving strength and plasticity of low-carbon steel |
| CN113801984B (en) * | 2020-06-15 | 2023-03-21 | 中国科学院金属研究所 | Plastic deformation processing technology for synchronously improving strength and plasticity of low-carbon steel |
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