CN110205544B - Chromium-free medium-manganese high-boron iron-based wear-resistant alloy and preparation method thereof - Google Patents

Chromium-free medium-manganese high-boron iron-based wear-resistant alloy and preparation method thereof Download PDF

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CN110205544B
CN110205544B CN201910458701.2A CN201910458701A CN110205544B CN 110205544 B CN110205544 B CN 110205544B CN 201910458701 A CN201910458701 A CN 201910458701A CN 110205544 B CN110205544 B CN 110205544B
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iron
alloy
based wear
resistant alloy
chromium
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CN110205544A (en
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吴润
张永锟
宋述鹏
徐凯
陈金
郝康达
周和荣
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Huangshi Yuanxiang Mould Material Co.,Ltd.
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Wuhan University of Science and Engineering WUSE
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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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D2211/001—Austenite
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

A chromium-free medium-manganese high-boron iron-based wear-resistant alloy and a preparation method thereof. The technical scheme is as follows: the high-boron iron-based wear-resistant alloy comprises the following chemical components: b is 1.5-3.0 wt%; c is 0.2-0.6 wt%; 0.8-1.2 wt% of Al; si is 0.7-1.4 wt%; mn is 4.0-10.0 wt%; ti is 0.3-0.5 wt%; ce accounts for 0.4-0.6 wt%; mg accounts for 0.4-0.6 wt%; s < 0.03 wt%; p is less than 0.04 wt%; the balance being Fe and unavoidable impurities. Firstly, scrap steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant are mixed according to chemical components of the high-boron-iron-based wear-resistant alloy, then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other mixtures is poured into the ladle, and the chromium-free medium-manganese high-boron-iron-based wear-resistant alloy is prepared by adopting a sand mould or an iron mould for casting forming, cooling and carrying out Mn mixing heat treatment. The product prepared by the invention has low cost, high hardness and good toughness.

Description

Chromium-free medium-manganese high-boron iron-based wear-resistant alloy and preparation method thereof
Technical Field
The invention belongs to the technical field of high-boron iron-based wear-resistant alloy. In particular to a chromium-free medium manganese high boron iron-based wear-resistant alloy and a preparation method thereof.
Background
There are three main forms of material failure: fracture, corrosion and wear. Although wear does not cause catastrophic damage to metal workpieces in either of the other two forms, the resulting economic loss is quite dramatic. In failed mechanical parts75-80% of the metal abrasion is caused by metal abrasion, and the failure caused by abrasion not only influences the use efficiency and the durability of the machine equipment, but also consumes a large amount of manpower and material resources to replace accessories and maintain the equipment, thereby causing huge economic loss. Therefore, various wear-resistant materials are developed, and the high-boron iron-based wear-resistant alloy is one of the wear-resistant materials. Compared with other steel-based wear-resistant materials, the high-boron iron-based wear-resistant alloy has two outstanding advantages: firstly, because the alloy does not contain a large amount of noble alloy elements such as Ni, Cr, Cu, Mo, W, V and the like, the cost is low; second, hard phase Fe in alloy2The microhardness of B is HV 1300-1600, and the B is compatible with hard phase Cr in high-chromium cast iron alloy7C3The microhardness HV 1200-1500 is equivalent to or slightly higher than that of the alloy, and the wear resistance is good. These advantages have attracted extensive attention from researchers.
However, due to Fe2And B has larger brittleness, and when the boron content is higher, a net structure is formed, so that the impact toughness of the high-boron iron-based wear-resistant alloy is reduced, and the application of the high-boron iron-based wear-resistant alloy under the working conditions of medium and high impact load is limited. Therefore, the prior art mostly focuses on improving the brittleness of boride:
one is to improve the brittleness of the boride itself. The method mainly improves the solid solubility of boron element by adding Cr and Mo, and simultaneously, the alloy element replaces Fe2Part of iron atoms in B improve the bonding force of B-B bonds, thereby reducing Fe2The intrinsic brittleness of the B hard phase, thereby improving the impact toughness performance of the wear-resistant alloy. For example, the influence of different chromium contents on the alloy structure and performance is researched by Dengbackeau et al, (Dengbackeau et al, influence of chromium on the hypoeutectic Fe-C-B alloy structure and mechanical property [ J]Material Heat treatment journal 2013.34(12): 67-71).
Secondly, the network-like distribution structure of boride is improved. Such methods are modification treatment and high temperature heat treatment. Studies on the influence of single modifier and composite modifier on the properties of high-boron-iron-based wear-resistant alloy (Studies on the control of hard phase morphology of Fe-Cr-B-C series high-boron-iron-based alloy and the influence on the properties thereof [ D ]]University of Kunming science 2016: 91-92); the regular member and the like improve boride step by step through high-temperature heat treatment to promote net-shaped Fe2Fracture B (He Zheng member, et al, quenchingEffect of fire temperature on texture and Properties of cast Fe-0.61C-1.56B alloys [ J]Heat treatment of metals 2013.38(2): 67-69).
Although the above-mentioned techniques improve the toughness of the material to some extent, the addition of a large amount of Cr increases the production cost of the alloy. While these studies are limited to improving the distribution and intrinsic brittleness of borides, another important component of the alloy (the matrix) does not contribute to toughness. The microstructure of the prior high-boron iron-based wear-resistant alloy is single, most of the high-boron iron-based wear-resistant alloy is a large amount of ferrite and a small amount of pearlite structures under the casting condition, and most of the high-boron iron-based wear-resistant alloy is a large amount of martensite and a small amount of austenite structures after high-temperature heat treatment. Such a matrix structure mainly composed of single components is difficult to be deformed in coordination with each other in internal structure structures when being impacted, and has relatively low toughness.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a chromium-free medium manganese high boron iron-based wear-resistant alloy with low cost, high hardness and good toughness and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following chemical components: b is 1.5-3.0 wt%; c is 0.2-0.6 wt%; 0.8-1.2 wt% of Al; si is 0.7-1.4 wt%; mn is 4.0-10.0 wt%; ti is 0.3-0.5 wt%; ce accounts for 0.4-0.6 wt%; mg accounts for 0.4-0.6 wt%; s < 0.03 wt%; p is less than 0.04 wt%; the balance being Fe and other unavoidable impurities.
The preparation method of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following steps: firstly, mixing scrap steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant according to chemical components of the high-boron-iron-based wear-resistant alloy; and then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other ingredients is poured into the ladle, the molten steel is cast and formed by adopting a sand mold or an iron mold, and is cooled to room temperature for Mn distribution heat treatment to prepare the chromium-free medium-manganese high-boron iron-based wear-resistant alloy.
The recarburizing agent is one of natural graphite pressed particles and graphitized electrode powder; the grain size of the carburant is 1-5 mm.
The particle size of the ferrotitanium, the rare earth magnesium silicon alloy and the rare earth ferrosilicon alloy is 2-6 mm.
The Mn distribution heat treatment process comprises the following steps: heating to 720-820 ℃, and preserving heat for 10-90 min; heating to 950-1050 ℃, and preserving heat for 2-10 min; then quenched to room temperature.
The casting temperature of the casting forming is 20-100 ℃ on an alloy liquid phase line.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
1. on the basis of improving boride distribution by adopting two types of composite modification treatment and high-temperature heat preservation, Mn element is added to replace Cr element in the prior art, so that the production cost of chromium-free medium-manganese high-boron iron-based wear-resistant alloy (hereinafter referred to as high-boron iron-based wear-resistant alloy) is reduced, and meanwhile, part of Mn atoms replace part of Fe atoms in boride to form iron-manganese composite boride, so that a proper amount of Mn element is added, and the toughness of boride is improved. Meanwhile, Mn element is distributed between austenite and ferrite by keeping the temperature of 720-820 ℃, so that the distribution of Mn element in the austenite has concentration gradient after high-temperature short-time austenitizing. The part with higher Mn concentration does not generate martensite transformation after high-temperature quenching and is reserved as residual austenite, so that the matrix structure of the prepared high-boron iron-based wear-resistant alloy contains not only martensite but also a large amount of residual austenite.
2. According to the invention, by adding a proper amount of Al and Si, a certain amount of ferrite still exists in the high-boron iron-based wear-resistant alloy matrix structure after high-temperature quenching, and the formation of brittle cementite in the cooling process is inhibited.
3. The matrix structure of the high-boron iron-based wear-resistant alloy prepared by the invention is composed of martensite, austenite and ferrite, the limitation of single matrix structure of the high-boron iron-based wear-resistant alloy is broken through, and the high-boron iron-based wear-resistant alloy obtains a diversified matrix structure. Martensite provides hardness assurance; austenite absorbs impact energy through the TRIP effect, improves toughness, and is transformed into martensite in deformation, so that the hardness of the high-boron iron-based wear-resistant alloy is further improved; the softer ferrite phase coordinative deformation delays the crack propagation; the three phases are mutually coordinated and act together, so that the high-boron iron-based alloy has good hardness and toughness.
The chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the invention is detected as follows: the hardness is 55-64 HRC; the impact toughness is 8-12J/cm2。
Therefore, the chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the invention has the characteristics of low cost, high hardness and good toughness.
Drawings
FIG. 1 is an XRD phase analysis diagram of a chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the invention;
FIG. 2 is a scanning electron microscope image of the chromium-free medium manganese high boron iron-based wear-resistant alloy shown in FIG. 1;
FIG. 3 is an XRD phase analysis of another chromium-free medium manganese high boron iron-based wear alloy prepared in accordance with the present invention;
FIG. 4 is a scanning electron microscope image of the chromium-free medium manganese high boron iron-based wear-resistant alloy shown in FIG. 3.
Detailed Description
The invention is further described with reference to the following figures and detailed description, without limiting its scope.
In this embodiment:
the grain size of the carburant is 1-5 mm;
the particle size of the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy is 2-6 mm;
the casting temperature of the casting forming is 20-100 ℃ on an alloy liquid phase line.
The detailed description is omitted in the embodiments.
Example 1
A chromium-free medium-manganese high-boron iron-based wear-resistant alloy and a preparation method thereof. The chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following chemical components: b is 1.5-2.0 wt%; c is 0.2-0.3 wt%; 0.8-0.95 wt% of Al; si accounts for 1.2-1.4 wt%; mn is 4.0-6.0 wt%; ti is 0.3-0.5 wt%; ce accounts for 0.4-0.6 wt%; mg accounts for 0.4-0.6 wt%; s < 0.03 wt%; p is less than 0.04 wt%; the balance being Fe and other unavoidable impurities.
The preparation method of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following steps: firstly, mixing scrap steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant according to chemical components of the high-boron-iron-based wear-resistant alloy; and then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other ingredients is poured into the ladle, the molten steel is cast and formed by adopting a sand mold or an iron mold, and is cooled to room temperature for Mn distribution heat treatment to prepare the chromium-free medium-manganese high-boron iron-based wear-resistant alloy.
The recarburizing agent is natural graphite pressed particles.
The Mn distribution heat treatment process comprises the following steps: heating to 720-760 ℃, and preserving heat for 10-30 min; then heating to 950-980 ℃, and preserving heat for 7-10 min; then quenched to room temperature.
The chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the embodiment is detected as follows: the hardness is 59-64 HRC; the impact toughness is 8.0-10.6J/cm2。
Example 2
A chromium-free medium-manganese high-boron iron-based wear-resistant alloy and a preparation method thereof. The chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following chemical components: b is 2.0-2.5 wt%; c is 0.3-0.45 wt%; 0.95-1.1 wt% of Al; si is 0.9-1.2 wt%; mn is 6.0-8.0 wt%; ti is 0.3-0.5 wt%; ce accounts for 0.4-0.6 wt%; mg accounts for 0.4-0.6 wt%; s < 0.03 wt%; p is less than 0.04 wt%; the balance being Fe and other unavoidable impurities.
The preparation method of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following steps: firstly, mixing scrap steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant according to chemical components of the high-boron-iron-based wear-resistant alloy; and then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other ingredients is poured into the ladle, the molten steel is cast and formed by adopting a sand mold or an iron mold, and is cooled to room temperature for Mn distribution heat treatment to prepare the chromium-free medium-manganese high-boron iron-based wear-resistant alloy.
The recarburizing agent is graphitized electrode powder.
The Mn distribution heat treatment process comprises the following steps: heating to 760-800 ℃, and preserving heat for 30-60 min; then heating to 980-1000 ℃, and preserving heat for 4-7 min; then quenched to room temperature.
The chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the embodiment is detected as follows: the hardness is 58-62 HRC; the impact toughness is 9.7-12.0J/cm2。
Example 3
A chromium-free medium-manganese high-boron iron-based wear-resistant alloy and a preparation method thereof. The chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following chemical components: b is 2.5-3.0 wt%; c is 0.45-0.6 wt%; al accounts for 1.1-1.2 wt%; si is 0.7-0.9 wt%; mn accounts for 8.0-10.0 wt%; ti is 0.3-0.5 wt%; ce accounts for 0.4-0.6 wt%; mg accounts for 0.4-0.6 wt%; s < 0.03 wt%; p is less than 0.04 wt%; the balance being Fe and other unavoidable impurities.
The preparation method of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following steps: firstly, mixing scrap steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant according to chemical components of the high-boron-iron-based wear-resistant alloy; and then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other ingredients is poured into the ladle, the molten steel is cast and formed by adopting a sand mold or an iron mold, and is cooled to room temperature for Mn distribution heat treatment to prepare the chromium-free medium-manganese high-boron iron-based wear-resistant alloy.
The Mn distribution heat treatment process comprises the following steps: heating to 800-820 ℃, and keeping the temperature for 60-90 min; heating to 1000-1050 ℃, and preserving heat for 2-4 min; then quenched to room temperature.
The recarburizing agent is one of natural graphite pressed particles and graphitized electrode powder.
The chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the embodiment is detected as follows: the hardness is 55-61 HRC; the impact toughness is 9.3-11.1J/cm2。
Compared with the prior art, the specific implementation mode has the following positive effects:
1. according to the specific embodiment, on the basis of improving boride distribution by adopting two types of composite modification treatment and high-temperature heat preservation, Mn is added to replace Cr in the prior art, so that the production cost of chromium-free medium-manganese high-boron iron-based wear-resistant alloy (hereinafter referred to as high-boron iron-based wear-resistant alloy) is reduced, and meanwhile, part of Mn atoms replace part of Fe atoms in boride to form iron-manganese composite boride, so that a proper amount of Mn is added, and the toughness of boride is improved. Meanwhile, Mn element is distributed between austenite and ferrite by keeping the temperature of 720-820 ℃, so that the distribution of Mn element in the austenite has concentration gradient after high-temperature short-time austenitizing. The part with higher Mn concentration does not generate martensite transformation after high-temperature quenching and is reserved as residual austenite, so that the matrix structure of the prepared high-boron iron-based wear-resistant alloy contains not only martensite but also a large amount of residual austenite.
2. In the specific embodiment, a certain amount of ferrite still exists in the high-boron iron-based wear-resistant alloy matrix structure after high-temperature quenching by adding a proper amount of Al and Si, and the formation of brittle cementite in the cooling process is inhibited.
3. The high-boron iron-based wear-resistant alloy prepared by the specific embodiment is shown in the attached drawing, and fig. 1 is an XRD (X-ray diffraction) phase analysis diagram of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy prepared in example 1; FIG. 2 is a scanning electron microscope image of the chromium-free medium manganese high boron iron-based wear-resistant alloy shown in FIG. 1; FIG. 3 is an XRD phase analysis of a chromium-free medium manganese high boron iron-based wear alloy prepared in example 2; FIG. 4 is a scanning electron microscope image of the chrome-free medium manganese high boron wear-resistant alloy shown in FIG. 3; as can be seen from fig. 1, 2, 3 and 4: the matrix of the prepared chromium-free medium-manganese high-boron iron-based wear-resistant alloy consists of three phases of ferrite, martensite and austenite. The matrix structure is composed of martensite, austenite and ferrite, so that the limitation of single matrix structure of the high-boron iron-based wear-resistant alloy is broken through, and the high-boron iron-based wear-resistant alloy obtains a diversified matrix structure. Martensite provides hardness assurance; austenite absorbs impact energy through the TRIP effect, improves toughness, and is transformed into martensite in deformation, so that the hardness of the high-boron iron-based wear-resistant alloy is further improved; the softer ferrite phase coordinative deformation delays the crack propagation; the three phases are mutually coordinated and act together, so that the high-boron iron-based alloy has good hardness and toughness.
The chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the specific embodiment is detected as follows: the hardness is 55-64 HRC; the impact toughness is 8-12J/cm2。
Therefore, the chromium-free medium manganese high boron iron-based wear-resistant alloy prepared by the specific embodiment has the characteristics of low cost, high hardness and good toughness.

Claims (4)

1. A preparation method of a chromium-free medium manganese high boron iron-based wear-resistant alloy is characterized in that the chemical components of the chromium-free medium manganese high boron iron-based wear-resistant alloy are as follows: 1.5-3.0 wt% of B, 0.2-0.6 wt% of C, 0.8-1.2 wt% of Al, 0.7-1.4 wt% of Si, 4.0-10.0 wt% of Mn, 0.3-0.5 wt% of Ti, 0.4-0.6 wt% of Ce, 0.4-0.6 wt% of Mg, less than 0.03 wt% of S, less than 0.04 wt% of P, and the balance of Fe and other unavoidable impurities;
the preparation method of the chromium-free medium-manganese high-boron iron-based wear-resistant alloy comprises the following steps: firstly, waste steel, pig iron, ferroboron, ferrosilicon, ferromanganese, ferrotitanium, rare earth magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant are mixed according to chemical components of the high-boron-iron-based wear-resistant alloy, then the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy are preset at the bottom of a ladle, then molten steel smelted by other mixed materials is poured into the ladle, the casting forming is carried out by adopting a sand mould or an iron mould, the cooling is carried out to the room temperature, and Mn distribution heat treatment is carried out to prepare the chromium-free medium-manganese high-boron-iron-based wear-resistant alloy;
the particle size of the ferrotitanium, the rare earth magnesium-silicon alloy and the rare earth ferrosilicon alloy is 2-6 mm;
the Mn distribution heat treatment process comprises the following steps: heating to 720-820 ℃, and preserving heat for 10-90 min; heating to 950-1050 ℃, and preserving heat for 2-10 min; then quenched to room temperature.
2. The method for preparing a chromium-free medium manganese high boron iron-based wear-resistant alloy according to claim 1, wherein the recarburizing agent is one of natural graphite pressed particles and graphitized electrode powder; the grain size of the carburant is 1-5 mm.
3. The method for preparing the chromium-free medium-manganese high-boron iron-based wear-resistant alloy according to claim 1, wherein the casting temperature for casting and forming is 20-100 ℃ on an alloy liquidus line.
4. A chromium-free medium manganese high boron iron-based wear-resistant alloy, which is characterized in that the chromium-free medium manganese high boron iron-based wear-resistant alloy is prepared according to the production method of the chromium-free medium manganese high boron iron-based wear-resistant alloy of any one of claims 1 to 3.
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