CN114214573B - Ferrite-martensite dual-phase steel and preparation method thereof - Google Patents

Ferrite-martensite dual-phase steel and preparation method thereof Download PDF

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CN114214573B
CN114214573B CN202111556232.1A CN202111556232A CN114214573B CN 114214573 B CN114214573 B CN 114214573B CN 202111556232 A CN202111556232 A CN 202111556232A CN 114214573 B CN114214573 B CN 114214573B
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martensite
ferrite
steel
dual
cooling
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CN114214573A (en
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孙俊杰
王浩
柳永宁
徐彬
赵睿澍
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Xian Jiaotong University
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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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • 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

Abstract

The invention discloses a ferrite-martensite dual-phase steel and a preparation method thereof, wherein the ferrite-martensite dual-phase steel consists of the following elements in percentage by mass: 0.1 to 0.35 percent; mo:0.01 to 0.5 percent; si:1.2% -3.5%; mn:1.5% -3.0%; cr:0.8 to 3.5 percent; v:0.05 to 0.25 percent; ni:0.1 to 1.5 percent; the balance being Fe. The invention prepares the fine-flake ferrite martensite dual-phase steel material by a simple heat treatment process, and the dual-phase steel structure is that ferrite and martensite which are characterized by multi-directional laths are alternately distributed in the crystal of prior austenite.

Description

Ferrite-martensite dual-phase steel and preparation method thereof
Technical Field
The invention belongs to the technical field of ferrite martensite dual-phase steel preparation, and particularly relates to ferrite martensite dual-phase steel and a preparation method thereof.
Background
Compared with other engineering materials, the steel material has the characteristics of high strength, good plasticity and toughness, uniform material, high working reliability and the like, and the obvious mechanical characteristics of the steel material make the steel material have great attraction in the application of industrial manufacturing. With the development of the industries such as ocean engineering, energy chemical industry, transportation and the like, the steel material is required to have high strength and good toughness, and the high-strength high-toughness steel has important significance in reducing the weight of the structural member, improving the safety and reducing the energy consumption.
The ferrite-martensite dual-phase steel is a steel grade which is developed in the last 60-70 years and has high strength and high toughness, and the structure of the ferrite-martensite dual-phase steel consists of hard phase martensite and soft matrix phase ferrite. The ferritic martensitic dual phase steel exhibits good mechanical properties such as high strength, good formability, low yield ratio, high work hardening rate, high uniform total elongation, high fatigue resistance and weldability, and is widely used in the fields of automobiles and the like.
The existing method for preparing the superfine crystal dual-phase steel material mainly adopts a deformation induced phase change technology and a large deformation + two-phase region short-time heating preparation technology, and although the two methods can prepare the dual-phase steel with excellent performance, both methods have certain disadvantages; wherein, the deformation induced phase transition technology has strict requirements on process conditions such as deformation rate, cooling rate and the like; the technology for preparing the dual-phase steel by large deformation and short-time heating in the two-phase region needs large plastic deformation of materials and large deformation resistance of the materials, so the technology is generally used for preparing the dual-phase steel materials of the centimeter grade and below in a laboratory, and a large amount of energy is consumed in the process. In conclusion, the preparation of large-size fine grain dual-phase steel suitable for industrial production is still a difficult problem in the field of dual-phase steel production.
Disclosure of Invention
The present disclosure is directed to a ferritic-martensitic dual phase steel and a method for manufacturing the same, which solve one or more of the above-mentioned problems. The invention prepares the fine-flake ferrite martensite dual-phase steel material by a simple heat treatment process, and the dual-phase steel structure is that ferrite and martensite which are characterized by multi-directional laths are alternately distributed in the crystal of prior austenite.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a ferrite martensite dual-phase steel which comprises the following elements in percentage by mass,
C：0.1％～0.35％；
Mo：0.01％～0.5％；
Si：1.2％～3.5％；
Mn：1.5％～3.0％；
Cr：0.8％～3.5％；
V：0.05％～0.25％；
Ni：0.1％～1.5％；
the balance of Fe;
wherein the structure of the ferrite-martensite dual-phase steel is as follows: the ferrite and martensite with the characteristics of multi-orientation lath are distributed in the original austenite crystal in an alternating way.
The further improvement of the invention is that in the ferrite-martensite dual-phase steel, the thickness of the martensite strip is 0.2-1.5 μm, and the thickness of the ferrite strip is 0.1-2.0 μm.
In a further improvement of the present invention, the prior austenite has an average grain size of 20 to 120 μm in the ferritic-martensitic dual phase steel.
The further improvement of the invention is that the volume fraction of martensite in the ferrite-martensite dual-phase steel is 15-70%.
The invention provides a preparation method of ferrite-martensite dual-phase steel, which comprises the following steps:
step 1, preparing alloy steel according to the element proportion of claim 1;
step 2, austenitizing the alloy steel obtained in the step 1, preserving heat, and cooling to room temperature to obtain lath martensite or bainite steel;
and 3, heating the lath martensite or bainite steel obtained in the step 2 to a preset temperature in a two-phase region, preserving heat, and cooling to prepare the ferrite-martensite dual-phase steel with lath characteristics.
The further improvement of the invention is that in the step 2, when the alloy steel obtained in the step 1 is austenitized, the austenitizing temperature range is 800-1200 ℃.
The invention has the further improvement that in the step 2, the step of cooling to room temperature specifically comprises the following steps: cooling to room temperature by water quenching or air cooling.
The further improvement of the invention is that in the step 3, the cooling step specifically comprises: and cooling by water quenching or air cooling.
The invention is further improved in that in the step 3, the duration of the heat preservation is 0.5-2 h.
Compared with the prior art, the invention has the following beneficial effects:
the alloy steel has obvious tissue genetic characteristics, a lath martensite or bainite structure obtained after quenching or air cooling can obtain a ferrite/austenite structure with lath characteristics after being heated in a two-phase region, and a flaky ferrite-martensite dual-phase structure can be obtained after water quenching or air cooling.
The invention provides a preparation method of flake-shaped ferrite-martensite dual-phase steel, which utilizes the tissue genetic phenomenon of martensite or bainite steel in the heating process of a two-phase region to obtain ferrite and austenite tissues with lath characteristics after the two-phase region is heated, so that the tissues are refined, and then the flake-shaped ferrite-martensite tissues are obtained by water quenching or air cooling. Compared with the preparation method of large deformation and short-time heating of the two-phase region, the preparation method of the flake ferrite martensite dual-phase steel has simple process, does not need large-degree plastic deformation, and can prepare workpieces with larger sizes; compared with the deformation induced phase change preparation method, the method has the advantages of simple heat treatment process and strong controllability, and can obtain ferrite martensite dual-phase steel without deformation, thereby greatly reducing the preparation difficulty. Besides, the method can adjust the content and the size of two phases in the flake ferrite martensite dual-phase steel by regulating the austenitizing temperature, the heating temperature of the two-phase region and the heating time, and the preparation process is energy-saving and environment-friendly and is suitable for industrial production.
The ferrite martensite dual-phase steel has simple heat treatment process and high production efficiency, can obtain the ferrite martensite structure with excellent performance and lath characteristics only by carrying out simple two-phase zone heating and quenching treatment on the quenched martensite or air-cooled bainite structure, reduces the complicated process steps of the preparation method at the present stage, can save a large amount of energy for workshops, has low requirement on equipment in the preparation process, can carry out tissue production on the premise of not increasing equipment in a general heat treatment workshop, and basically has no difficulty in heat treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of a quenched martensite structure of an alloy steel in example 2 of the present invention;
FIG. 2 is a SEM structure diagram of a fine-grained ferritic martensitic dual-phase steel with lath characteristics prepared in example 2 of the present invention;
FIG. 3 is a TEM structure of a fine-grained ferritic martensitic dual-phase steel with lath characteristics prepared in example 2 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the fine-flake ferrite-martensite dual-phase steel provided by the embodiment of the invention comprises the following chemical components in percentage by weight,
C：0.1％～0.35％；
Mo：0.01％～0.5％；
Si：1.2％～3.5％；
Mn：1.5％～3.0％；
Cr：0.8％～3.5％；
V：0.05％～0.25％；
Ni：0.1％～1.5％；
the balance of Fe;
wherein the structure of the flake dual-phase steel is as follows: ferrite and martensite which are characterized by multi-directional laths are distributed in the crystal of the prior austenite in an alternating manner.
In the embodiment of the invention, the average grain size of the prior austenite is 20-120 mu m, the thickness of the martensite strip is 0.2-1.5 mu m, the thickness of the ferrite strip is 0.1-2.0 mu m, and the volume fraction of the martensite is 15-70%.
The alloy steel has obvious tissue genetic characteristics, a lath martensite or bainite structure obtained after quenching or air cooling can obtain a ferrite/austenite structure with lath characteristics after being heated in a two-phase region, and a flaky ferrite-martensite dual-phase structure can be obtained after water quenching or air cooling.
The preparation method of the fine-flake ferrite martensite dual-phase steel comprises the following steps:
the method comprises the following steps: the alloy steel comprises the following components in percentage by weight (wt.%): c:0.1 to 0.35 percent; mo:0.01 to 0.5 percent; si:1.2 to 3.5 percent; mn:1.5 to 3.0 percent; cr:0.8 to 3.5 percent; v:0.05 to 0.25 percent; ni:0.1 to 1.5 percent, and the balance of Fe; austenitizing the alloy steel, preserving the heat for a certain time, and then performing water quenching or air cooling to room temperature to obtain lath martensite or bainite structures.
Step two: and (3) heating the lath martensite or bainite steel obtained in the step one to a certain temperature of a two-phase region, preserving heat for a certain time, and then performing water quenching or air cooling treatment to obtain the fine-piece ferrite martensite dual-phase steel with lath characteristics.
Wherein the austenitizing temperature of the alloy steel in the first step is 800-1200 ℃. In the second step, the heating temperature of lath martensite or bainite steel is set at A 1 ～A 3 The temperature is kept for 0.5 to 2 hours.
The ferrite martensite dual-phase steel provided by the embodiment of the invention has the advantages of simple heat treatment process and high production efficiency; the ferrite martensite structure with the lath characteristic can be obtained only by simply heating and quenching the quenched martensite or air-cooled bainite structure in a two-phase region, so that a large amount of energy can be saved; the preparation process has low requirement on equipment, and the general heat treatment workshop can organize production on the premise of not increasing the equipment, so that the difficulty in heat treatment is basically avoided.
The fine-flake ferrite-martensite dual-phase steel of the embodiment of the invention is subjected to complete austenitization and then water quenching or air cooling to obtain martensite or bainite structure, and then the obtained martensite or bainite steel is processed in A 1 ～A 3 Keeping the temperature at a certain temperature for 0.5-2.0 h (heating in a two-phase region), and then quenching with water or cooling with air to room temperature to obtain the lamellar ferrite martensite dual-phase steel, wherein the volume fraction of the martensite phase can be regulated and controlled by regulating and controlling the heating temperature in the two-phase region.
Example 1
In the embodiment of the invention, the components of the preparation material are as follows,
Fe-0.25-1.8-Mn-1.8-Si-1.3-Cr-0.4-Mo-0.25-Ni-0.1-V dual-phase steel material;
the preparation method comprises the following specific operations:
heating alloy steel to 1000 ℃ to austenize, preserving heat for 1h to homogenize austenite components, and then performing water quenching to obtain a lath martensite structure, wherein the prior austenite grain size is about 85 mu m;
and (3) reheating the lath martensite structure to 780 ℃, preserving the heat for 1h, and then performing water quenching treatment to obtain the flaky ferrite-martensite dual-phase steel.
Example 2
In the embodiment of the invention, the components of the preparation material are as follows,
Fe-0.25-1.8-Mn-1.8-Si-1.3-Cr-0.4-Mo-0.25-Ni-0.1-V dual-phase steel material;
the preparation method comprises the following specific operations:
heating alloy steel to 920 ℃ for austenitizing, preserving the heat for 1.5 hours to homogenize austenite components, and then cooling in air to obtain a bainite structure, wherein the size of prior austenite crystal grains is about 47 mu m, and the structure is shown in figure 1;
and (3) reheating the bainite structure to 780 ℃, preserving the heat for 1h, and then performing water quenching treatment on the material to obtain the fine-sheet ferrite martensite dual-phase steel, wherein the SEM structure is shown in figure 2, and the TEM structure is shown in figure 3.
Example 3
In the embodiment of the invention, the components of the preparation material are as follows,
Fe-0.25-1.8-Mn-1.8-Si-1.3-Cr-0.4-Mo-0.25-Ni-0.1-V dual-phase steel material;
the preparation method comprises the following specific operations:
heating alloy steel to 1200 ℃ to austenize, preserving heat for 2h to homogenize austenite components, and then performing water quenching to obtain a lath martensite structure, wherein the size of the lath martensite is about 215 micrometers;
and (3) reheating the lath martensite structure to 780 ℃, preserving heat for 1h, and then carrying out water quenching treatment on the material to obtain the flaky ferrite-martensite dual-phase steel.
Example 4
In the embodiment of the invention, the components of the preparation material are as follows,
Fe-0.2-1.8-Mn-1.8-Si-1.3-Cr-0.4-Mo-0.25-Ni-0.1-V dual-phase steel material;
the preparation method comprises the following specific operations:
heating the alloy steel to 900 ℃ to austenize, preserving heat for 1.5 hours to homogenize austenite components, and then performing water quenching to obtain a lath martensite structure;
and (3) reheating the lath martensite structure to 800 ℃, preserving the heat for 1.5h, and then performing water quenching treatment on the material to obtain the fine-flaky ferrite-martensite dual-phase steel.
Example 5
In the embodiment of the invention, the components of the preparation material are as follows,
Fe-0.3-1.8-Mn-1.8-Si-2-Cr-0.4-Mo-0.25-Ni-0.1-V dual-phase steel material;
the preparation method comprises the following specific operations:
heating the alloy steel to 900 ℃ to austenize, preserving heat for 1.5h to homogenize austenite components, and then performing water quenching to obtain a lath martensite group;
and (3) reheating the lath martensite structure to 800 ℃, preserving the heat for 1.5h, and then performing water quenching treatment on the material to obtain the fine-flaky ferrite-martensite dual-phase steel.
Example 6
The preparation method of the ferrite martensite dual-phase steel provided by the embodiment of the invention comprises the following steps:
step 1, according to C:0.1%, mo:0.01%, si:1.2%, mn:1.5%, cr:0.8%, V:0.05%, ni:0.1 percent and the balance of Fe, and preparing the alloy steel;
step 2, austenitizing the alloy steel obtained in the step 1, preserving heat, and cooling to room temperature to obtain lath martensite or bainite steel;
and 3, heating the lath martensite or bainite steel obtained in the step 2 to a preset temperature in a two-phase region, preserving heat, and cooling to prepare the ferrite-martensite dual-phase steel with lath characteristics.
In the step 2, when the alloy steel obtained in the step 1 is austenitized, the austenitizing temperature range is 800 ℃; in the step 2, the step of cooling to room temperature specifically comprises: cooling to room temperature by water quenching; in step 3, the cooling step specifically comprises: cooling by adopting a water quenching mode; in the step 3, the duration range of the heat preservation is 0.5h.
The ferrite martensite dual-phase steel prepared by the embodiment of the invention has the following structure: the ferrite and martensite with the characteristics of multi-orientation lath are distributed in the original austenite crystal in an alternating way.
Example 7
The preparation method of the ferrite martensite dual-phase steel provided by the embodiment of the invention comprises the following steps:
step 1, according to C:0.25%, mo:0.25%, si:2.5%, mn:2.0%, cr:2.0%, V:0.15%, ni:1.0 percent and the balance of Fe, and preparing the alloy steel;
step 2, austenitizing the alloy steel obtained in the step 1, preserving heat, and cooling to room temperature to obtain lath martensite or bainite steel;
and 3, heating the lath martensite or bainite steel obtained in the step 2 to a preset temperature in a two-phase region, preserving heat, and cooling to prepare the ferrite-martensite dual-phase steel with lath characteristics.
In the step 2, when the alloy steel obtained in the step 1 is austenitized, the austenitizing temperature range is 1000 ℃; in step 2, the step of cooling to room temperature specifically comprises: cooling to room temperature by adopting a water air cooling mode; in step 3, the cooling step specifically comprises: cooling treatment is carried out in an air cooling mode; in the step 3, the duration range of the heat preservation is 1h.
The ferrite martensite dual-phase steel prepared by the embodiment of the invention has the following structure: ferrite and martensite which are characterized by multi-directional laths are distributed in the crystal of the prior austenite in an alternating manner.
Example 8
The preparation method of the ferrite-martensite dual-phase steel provided by the embodiment of the invention comprises the following steps:
step 1, according to C:0.35%, mo:0.5%, si:3.5%, mn:3.0%, cr:3.5%, V:0.25%, ni:1.5 percent and the balance of Fe, and preparing the alloy steel;
step 2, austenitizing the alloy steel obtained in the step 1, preserving heat, and cooling to room temperature to obtain lath martensite or bainite steel;
and 3, heating the lath martensite or bainite steel obtained in the step 2 to a preset temperature in a two-phase region, preserving heat, and cooling to prepare the ferrite-martensite dual-phase steel with lath characteristics.
In the step 2, when the alloy steel obtained in the step 1 is austenitized, the austenitizing temperature range is 1200 ℃; in step 2, the step of cooling to room temperature specifically comprises: cooling to room temperature in an air cooling mode; in step 3, the cooling step specifically comprises: cooling by adopting a water quenching mode; in the step 3, the duration range of heat preservation is 2h.
The ferrite-martensite dual-phase steel prepared by the embodiment of the invention has the following structure: ferrite and martensite which are characterized by multi-directional laths are distributed in the crystal of the prior austenite in an alternating manner.
The chemical components of the fine-flake ferrite martensite dual-phase steel prepared by the embodiment of the invention are as follows: c:0.1 to 0.35 percent; mo:0.01 to 0.5 percent; si:1.2% -3.5%; mn:1.5 to 3.0 percent; cr:0.8 to 3.5 percent; v:0.05 to 0.25 percent; ni:0.1 to 1.5 percent, and the balance of Fe. Austenitizing the alloy steel, preserving the heat for a certain time, and then performing water quenching or air cooling to room temperature to obtain lath martensite or bainite structures. Heating the lath martensite or bainite steel to a certain temperature in a two-phase region, preserving the heat for a certain time, and then performing water quenching or air cooling treatment to obtain the fine-piece ferrite martensite dual-phase steel with lath characteristics. The fine-flake ferrite martensite dual-phase steel prepared according to the chemical components, the treatment process and the structure control technology not only has high tensile strength, but also has better plasticity.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (1)

1. A method for preparing ferrite martensite dual-phase steel is characterized by comprising the following steps:
step 1, preparing alloy steel according to element proportion;
step 2, austenitizing the alloy steel obtained in the step 1, preserving heat, and cooling to room temperature to obtain lath martensite or bainite steel;
step 3, heating the lath martensite or bainite steel obtained in the step 2 to a preset temperature in a two-phase region, preserving heat, and cooling to prepare ferrite-martensite dual-phase steel with lath characteristics;
wherein the element proportion in the step 1 is composed of the following elements in percentage by mass,
C：0.1％～0.35％；
Mo：0.01％～0.5％；
Si：1.2％～3.5％；
Mn：1.5％～3.0％；
Cr：0.8％～3.5％；
V：0.05％～0.25％；
Ni：0.1％～1.5％；
the balance being Fe;
in the step 2, when the alloy steel obtained in the step 1 is austenitized, the austenitizing temperature range is 800-1200 ℃; the step of cooling to room temperature specifically comprises: cooling to room temperature by water quenching or air cooling;
in step 3, the cooling step specifically comprises: cooling by water quenching or air cooling; the duration range of the heat preservation is 0.5-2 h;
the prepared ferrite-martensite dual-phase steel has the following structure: ferrite and martensite which are characterized by multi-directional laths are alternately distributed in the prior austenite crystal; in the ferrite martensite dual-phase steel, the thickness of a martensite strip is 0.2-1.5 μm, and the thickness of a ferrite strip is 0.1-2.0 μm; in the ferrite martensite dual-phase steel, the average grain size of prior austenite is 20-120 mu m; in the ferrite martensite dual-phase steel, the volume fraction of martensite is 15-70%.
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