CN111057946A - A kind of (Cr, Fe)7C3TiC composite reinforced medium manganese steel and manufacturing method thereof - Google Patents

A kind of (Cr, Fe)7C3TiC composite reinforced medium manganese steel and manufacturing method thereof Download PDF

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CN111057946A
CN111057946A CN201911160876.1A CN201911160876A CN111057946A CN 111057946 A CN111057946 A CN 111057946A CN 201911160876 A CN201911160876 A CN 201911160876A CN 111057946 A CN111057946 A CN 111057946A
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steel
wear
medium manganese
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孟征兵
刘炜
殷鑫
邓耀德
唐祖田
吕霞
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Guilin University of Technology
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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
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
    • 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
    • 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
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Abstract

The invention relates to a (Cr, Fe)7C3TiC composite reinforced medium manganese wear-resistant steel and a preparation method thereof, belonging to the field of wear-resistant steel materials. The composite reinforced medium manganese wear-resistant steel comprises, by weight, 0.5-1.6% of C, 0.1-1.0% of Si, 6.0-9.0% of Mn, 3.5-9.5% of Cr, 0.01-1.50% of Ti and 0% of B.001-0.005%, 0.04-0.10% of Al, less than or equal to 0.015% of S, less than or equal to 0.015% of P, and the balance of iron and inevitable impurity elements. The manufacturing method comprises the steps of smelting, die casting, homogenizing annealing, quenching and tempering. The final structure is austenite, (Cr, Fe)7C3And a TiC composite structure. (Cr, Fe)7C3And TiC particles having a volume fraction of 10-25% and an average size of 0.3-7 um. The hardness range of the composite reinforced medium manganese wear-resistant steel is 49-59HRC, and the impact toughness Aku2 is more than or equal to 33J/cm2And the wear resistance under the working conditions of medium and low stress impact is 3-4 times that of the common medium manganese steel (Mn 6).

Description

A kind of (Cr, Fe)7C3TiC composite reinforced medium manganese steel and manufacturing method thereof
Technical Field
The invention belongs to the technical field of wear-resistant steel, and particularly relates to a wear-resistant steel (Cr, Fe)7C3TiC composite reinforced medium manganese wear-resistant steel and a preparation method thereof.
Background
In order to solve the problem that the wear resistance of high manganese steel is insufficient under the conditions of medium and low stress impact working conditions, medium manganese wear-resistant steel is researched and developed in the last 70 th century.
The matrix structure of the medium manganese steel is tempered martensite and retained austenite, and the wear resistance of the medium manganese steel is directly related to the work hardening effect, namely the medium manganese steel has better work hardening effect under the working conditions of medium and low stress impact, the higher the hardness of the medium manganese steel is, and the better the wear resistance is.
The medium manganese wear-resistant steel is mainly used in the related fields of ore mining, ferrous metallurgy, agricultural production, mechanical manufacturing and the like, works under medium and low stress impact working conditions for a long time, has high requirements on the comprehensive properties of the material such as hardness, impact toughness, wear resistance and the like, particularly can be damaged by cutting wear when running in a stress environment, matrix materials on the surface of the medium manganese wear-resistant steel are peeled off from a matrix to cause loose and porous surfaces, and the cutting wear speed can be further accelerated by the impact of the materials.
The widely used medium manganese steel (Mn content is 5-11%) is modified and enhanced, and the heat treatment process mainly tends to martensite + retained austenite double-phase manganese wear-resistant steel, namely quenching and high-temperature tempering. In recent years, the wear resistance of microalloy element reinforced medium manganese steel is studied, for example, patent ZL201711174760.4 provides a medium manganese steel lining plate material for a ball mill and a preparation method thereof, wherein the lining plate material comprises the chemical components of 0.2-0.6% of C, 5.0-8.0% of Mn, 0.1-0.3% of Si, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.01-0.05% of Nb, 0.3-0.8% of Cr, and the balance of Fe and inevitable impurities. The hardness of the medium manganese wear-resistant steel reaches 55HRC, and the impact energy of a V-shaped sample is 30J. But the wear resistance under the working conditions of medium and low stress impact is not fully satisfactory. In recent years, research on optimizing casting technology to improve the wear resistance of medium manganese steel has shown that patent ZL201611241619.7 provides a method for preparing a wear-resistant plate for lost foam casting medium manganese steel, which comprises the chemical components of C1.0-1.1%, Mn 9.0-10.0%, Si 0.5-0.6%, P less than or equal to 0.03%, S less than or equal to 0.03%, Mo 0.5-0.9%, Cr 3.0-4.0%, and the balance of Fe and inevitable impurities. The manganese steel in the lost foam casting has certain wear resistance under the high stress impact working condition except good impact toughness, but has poor wear resistance performance under the medium and low stress impact working conditions, and can not meet the working condition requirements.
And noble alloy elements such as Mo, Nb and the like added in the medium manganese steel greatly improve the production cost of the medium manganese steel.
Based on the above, the wear-resistant medium manganese steel is expected to be obtained, wherein Ti is used for replacing precious elements such as Mo and Nb, and a second-phase wear-resistant phase is introduced into the medium manganese steel at a lower production cost, so that the work hardening capacity of the medium manganese steel under the working conditions of medium and low stress impact is improved, and the wear resistance can be greatly improved while good service performance can be ensured.
Disclosure of Invention
The invention aims to provide the medium manganese steel with high wear resistance under medium and low stress impact working conditions at lower production cost, and the medium manganese wear-resistant steel has high hardness, good toughness, excellent wear resistance and wide application range.
Technical problem to be solved
In order to solve the above problems of the prior art, the present invention provides (Cr, Fe)7C3TiC composite reinforced medium manganese steel and a manufacturing method thereof. The wear resistance under the condition of medium and low impact reaches 3 to 4 times of that of the traditional medium manganese steel (Mn6), and the service performance meets the use requirement of related equipment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a kind of (Cr, Fe)7C3The TiC composite reinforced medium manganese wear-resistant steel is characterized by comprising, by weight, 0.5-1.6% of C, 0.1-1.0% of Si, 6.0-9.0% of Mn, 3.5-9.5% of Cr, 0.01-1.50% of Ti, 0.001-0.005% of B, 0.04-0.10% of Al, less than or equal to 0.015% of S, less than or equal to 0.015% of P and the balance of iron and inevitable impurity elements.
In the present case (Cr, Fe)7C3The design principle of each chemical element of the TiC composite reinforced medium manganese wear-resistant steel is as follows:
c: the C element can be dissolved in the iron to play a role of solid solution strengthening, and can form various carbides with the iron and other carbide forming elements. Under the working conditions of medium and low stress impact, the content of C is increased, which is beneficial to improving the wear resistance of steel; when the content of C is too high, the toughness of the steel is difficult to meet the requirement, and the content of carbon is low, so that the steel has better toughness but insufficient wear resistance. Thus, in the present invention, (Cr, Fe)7C3The weight percentage of C of the manganese wear-resistant steel in the TiC composite reinforcement is 0.5-1.6%.
Si: firstly, in the smelting process, the deoxidation effect is achieved, and the recovery rate of Ti element can be improved to a certain extent; next, when the Si content in the steel is 1.3% or less, Si is used as an alloy element, the strength, toughness and plasticity of the steel material can be improved as the Si content increases, and when the Si content exceeds 1.3%, the plastic toughness is rapidly reduced. Thus, in the present invention, (Cr, Fe)7C3The weight percentage of Si of the manganese wear-resistant steel in the TiC composite reinforcement is 0.1-1.0%.
Mn: mn is one of the essential elements for the composition of medium manganese steel. The manganese element has a very important position in the medium manganese steel, and not only can expand the gamma phase region of the medium manganese steel and stabilize the austenite structure of the medium manganese steel; meanwhile, the manganese element can also increase the fault energy of an austenite structure on the medium manganese steel matrix, promote the generation of mechanical twin crystals in austenite under a stress environment and induce plastic deformation, thereby improving the wear resistance of the medium manganese steel. Thus, in the present invention, (Cr, Fe)7C3Mass percentage of Mn in TiC composite reinforced medium manganese wear-resistant steelThe ratio is 6.0-9.0%.
Cr: cr can improve hardenability of steel and improve strength and hardness of steel. In addition, Cr forms a continuous solid solution with Fe and can form multiple carbides (M) with carbon in steel3C、M7C3). Wherein M is7C3The carbide has an isolated rod-shaped structure, and can ensure better toughness while improving the hardness of the matrix. M of high hardness7C3The shaped carbide plays a role of a wear-resistant framework when worn, and the steel matrix mainly plays a role of supporting the M7C3The carbide, so that the Cr element content is increased to promote the wear resistance. Thus, in the present invention, (Cr, Fe)7C3The weight percentage of Cr in the TiC composite reinforced manganese wear-resistant steel is 3.5-9.5%.
Ti: the Ti element can refine matrix structure grains in the medium manganese steel, thereby achieving the purpose of improving the mechanical property and the wear resistance of the medium manganese steel. And if the Ti element is excessive, the toughness of the steel is remarkably reduced. And the affinity of Ti and C is extremely strong, and highly dispersed and distributed TiC particles with extremely high hardness are formed in the solidification process. Since Ti has a much greater affinity for C than Cr, M is nascent during solidification7C3Is inhibited, and M is effectively prevented7C3Nucleation at grain boundary and growth to form network structure, M7C3Is in the form of discrete rods or particles. Thus, in the present invention, (Cr, Fe)7C3The mass percentage of Ti of the manganese wear-resistant steel in the TiC composite reinforcement is 0.01-1.50%.
B: the main role of B in steel is to increase the hardenability of steel and to improve the high temperature strength of steel. Thus, in the present invention, (Cr, Fe)7C3The weight percentage of B of the manganese wear-resistant steel in the TiC composite reinforcement is 0.001-0.005%.
Al: after Al is used as a strong deoxidizer and an alloying element and added into steel, on one hand, Ti element can be better protected from being oxidized in advance, on the other hand, Al and N in the steel can form fine and insoluble AlN particles, steel grains are refined, and meanwhile, the generation of TiN particles can be reduced, so that the steel is remarkably improvedReduced cold-brittleness tendency and aging tendency. Thus, in the present invention, (Cr, Fe)7C3The Al content of the manganese wear-resistant steel in the TiC composite reinforcement is 0.04-0.10% by mass.
In the present invention, (Cr, Fe)7C3Impurities in the TiC composite reinforced medium manganese wear-resistant steel can reduce the quality and the service life of the steel plate, however, the production cost is greatly increased due to the fact that the impurities are controlled too tightly. In combination with the above considerations, (Cr, Fe) in the present invention7C3The impurities such as N, H and O in the manganese wear-resistant steel in the TiC composite strengthening are controlled to be less than or equal to 5.0ppm of H, less than or equal to 0.0035 percent of O and less than or equal to 0.006 percent of N.
Wherein the weight percentage content of C, Ti and Cr satisfies 0.90-5 Cr/C; the microstructure of the composite reinforced medium manganese wear-resistant steel consists of austenite and micron-sized (Cr, Fe)7C3And TiC particles.
Wherein the micron-sized (Cr, Fe)7C3The volume fraction sum of the TiC particles can reach 10-25%, and the average size is 0.3-7 um.
The present invention also provides the above (Cr, Fe)7C3The preparation method of TiC composite reinforced medium manganese steel is characterized by comprising the following steps of:
the material of the invention is smelted in a medium frequency induction furnace, and the specific manufacturing process comprises the following steps:
step 1: heating low-carbon steel scrap and pig iron to 1550-; then adding the medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace for melting and stirring for 20 minutes; then Al powder is added, stirring and deoxidation is carried out, ferrotitanium is added, stirring is carried out, after the ferrotitanium is melted, alkaline slag-forming material is added on the surface of the molten steel to prevent the secondary oxidation of the molten steel, the mass fraction of the elements in the molten steel is controlled to be 0.5-1.6 percent of C, 0.1-1.0 percent of Si, 6.0-9.0 percent of Mn, 3.5-9.5 percent of Cr, 0.01-1.50 percent of Ti, 0.001-0.005 percent of B, 0.04-0.10 percent of Al, less than or equal to 0.015 percent of S, less than or equal to 0.015 percent of P, and the balance of iron and inevitable impurity elements; and finally, reducing the temperature to 1500-1550 ℃, preserving the temperature for 15 minutes, then carrying out casting and forming after calming for 10 minutes, and cutting off a riser after air cooling the casting for 1-3 hours.
Step 2: heating the cast steel ingot obtained in the step 1 to 1100-;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: heating the steel ingot obtained in the step 3 to 200-7C3And TiC composite reinforced medium manganese wear-resistant steel.
The invention has the beneficial effects that:
1) one of the invention (Cr, Fe)7C3The TiC composite reinforced medium-manganese wear-resistant steel replaces V, Mo and other precious alloy elements by using Ti with lower price. Can produce high-hardness carbide (Cr, Fe)7C3The microhardness is 1300-1800HV, and the TiC microhardness can reach 3400HV) particle reinforced phase, so that the hardness and the wear resistance of the material can be obviously improved, and the production cost is reduced. One of the invention (Cr, Fe)7C3The TiC-compounded reinforced medium-manganese wear-resistant steel can achieve the following mechanical properties that the hardness range is 49-59HRC, and the impact toughness Aku2 is more than or equal to 33J/cm 2.
2) The invention relates to a novel alloy (Cr, Fe)7C3The TiC composite reinforced medium manganese wear-resistant steel is applied to the field of low and medium impact working condition wear, the work hardening effect is better than that of common medium manganese steel (Mn6), the wear resistance is 3-4 times of that of common medium manganese steel, the problems of poor austenite stability, relative insufficient wear resistance, delayed workpiece cracking and the like are solved, the comprehensive performance of castings is improved, and the large-scale production is facilitated.
Drawings
FIG. 1 shows (Cr, Fe) in example 17C3And TiC composite reinforced medium manganese wear-resistant steel scanning electron microscope picture;
FIG. 2 shows (Cr, Fe) in example 17C3A gold phase diagram of the TiC composite reinforced medium-manganese wear-resistant steel;
FIG. 3 shows (Cr, Fe) in example 17C3EDS diagram of the TiC composite reinforced medium manganese wear-resistant steel;
Detailed Description
Example 1:
of this example (Cr, Fe)7C3The chemical components of the TiC composite reinforced medium manganese wear-resistant steel comprise, by weight, 1.0% of C, 0.4% of Si, 6.5% of Mn, 6.0% of Cr, 0.05% of Ti, 0.004% of B, 0.04% of Al, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance Fe and inevitable impurities.
Of this example (Cr, Fe)7C3The manufacturing method of the TiC composite reinforced medium manganese wear-resistant steel comprises the following steps:
step 1: heating low-carbon steel scrap and pig iron to 1550-; then adding the medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace for melting and stirring for 10 minutes; then adding Al powder, stirring and deoxidizing, then adding ferrotitanium, stirring, adding an alkaline slagging material on the surface of the molten steel after the ferrotitanium is melted to prevent the molten steel from being secondarily oxidized, wherein the mass fractions of elements in the molten steel are controlled according to the embodiment 1; and finally, reducing the temperature to 1500-1550 ℃ and preserving the temperature for 5 minutes, then carrying out casting forming after calming for 2 minutes, and cutting off a riser after air cooling the casting for 1-3 hours.
Step 2: heating the cast steel ingot obtained in the step 1 to 1100-;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: heating the steel ingot obtained in the step 3 to 200-7C3And TiC composite reinforced medium manganese wear-resistant steel.
For explaining the problems, mechanical property tests and comparative abrasion tests are carried out under the middle and low stress impact working conditions (the laboratory temperature is 20-30 ℃), an MLD-10 type dynamic load impact abrasive abrasion tester is adopted, the dynamic load of the test is 10Kg, the abrasive is 60-80 meshes of quartz sand, the flow rate of the quartz sand is 6Kg/h, the impact energy is 3J, and the abrasive abrasion test is carried out according to the national standard GB/T12444-2006.
By testing, the (Cr, Fe) prepared in this example7C3The mechanical property and the wear resistance of the TiC-compounded reinforced medium manganese wear-resistant steel are that the hardness is 50HRC, the impact toughness aKu2 of a V-shaped sample is more than or equal to 30J/cm2The wear resistance under the working conditions of low and medium stress impact is 3.1 times that of the common medium manganese steel (Mn 6).
Example 2
Of this example (Cr, Fe)7C3The chemical components of the TiC composite reinforced medium manganese wear-resistant steel comprise, by weight, 1.0% of C, 0.4% of Si, 6.5% of Mn, 6.0% of Cr, 1.0% of Ti, 0.004% of B, 0.04% of Al, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance Fe and inevitable impurities.
Of this example (Cr, Fe)7C3The manufacturing method of the TiC composite reinforced medium manganese wear-resistant steel comprises the following steps:
step 1: heating low-carbon steel scrap and pig iron to 1550-; then adding the medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace for melting and stirring for 10 minutes; then Al powder is added to stir and deoxidize, ferrotitanium is added to stir, after the ferrotitanium is melted, alkaline slagging material is added to the surface of the molten steel to prevent the molten steel from secondary oxidation, and the mass fraction of elements in the molten steel is controlled according to the embodiment 2; and finally, reducing the temperature to 1500-1550 ℃ and preserving the temperature for 5 minutes, then carrying out casting forming after calming for 2 minutes, and cutting off a riser after air cooling the casting for 1-3 hours.
Step 2: heating the cast steel ingot obtained in the step 1 to 1100-;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: heating the steel ingot obtained in the step 3 to 200-7C3And TiC composite reinforced medium manganese wear-resistant steel.
Test methods the test procedure of example 1 was followed to prepare(Cr,Fe)7C3The mechanical property and the wear resistance of the TiC composite reinforced medium manganese wear-resistant steel are that the hardness is 53HRC, the impact toughness aKu2 of a V-shaped sample is more than or equal to 35J/cm2The wear resistance under the working conditions of low and medium stress impact is 3.2 times that of the common medium manganese steel (Mn 6).
Example 3:
of this example (Cr, Fe)7C3The chemical components of the TiC composite reinforced medium manganese wear-resistant steel comprise, by weight, 1.0% of C, 0.4% of Si, 6.5% of Mn, 6.0% of Cr, 1.25% of Ti, 0.004% of B, 0.04% of Al, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance Fe and inevitable impurities.
Of this example (Cr, Fe)7C3The manufacturing method of the TiC composite reinforced medium manganese wear-resistant steel comprises the following steps:
step 1: heating low-carbon steel scrap and pig iron to 1550-; adding medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace to melt for 10 minutes, adding Al powder to stir, deoxidize and alloy, adding ferrotitanium to stir, adding an alkaline slagging material to the surface of molten steel to prevent secondary oxidation of the molten steel after the ferrotitanium is melted, and controlling the mass fraction of elements in the molten steel according to the embodiment 1; and finally, reducing the temperature to 1500-1550 ℃ and preserving the temperature for 10 minutes, then, after calming for 5 minutes, casting and forming, and after air cooling the casting to the temperature lower than 100 ℃, cutting off a riser.
Step 2: heating the cast steel ingot obtained in the step 1 to 1100-;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: heating the steel ingot obtained in the step 3 to 200-7C3And TiC composite reinforced medium manganese wear-resistant steel.
Test methods (Cr, Fe) prepared in this example were tested according to example 17C3Compounding with TiCThe mechanical property and the wear resistance of the reinforced medium manganese wear-resistant steel are that the hardness is 55HRC, and the impact toughness Aku2 of a V-shaped sample is more than or equal to 37J/cm2The wear resistance under the working conditions of low and medium stress impact is 3-4 times that of the common medium manganese steel (Mn 6).
Example 4:
of this example (Cr, Fe)7C3The chemical components of the TiC composite reinforced medium manganese wear-resistant steel comprise, by weight, 1.0% of C, 0.4% of Si, 6.5% of Mn, 6.0% of Cr, 0.75% of Ti, 0.004% of B, 0.04% of Al, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance Fe and inevitable impurities.
Of this example (Cr, Fe)7C3The manufacturing method of the TiC composite reinforced medium manganese wear-resistant steel comprises the following steps:
step 1: heating low-carbon steel scrap and pig iron to 1600 ℃ by using a medium-frequency induction furnace, and keeping the temperature for 5 minutes; adding medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace to melt for 10 minutes, adding Al powder, stirring and deoxidizing alloy, adding ferrotitanium, stirring, adding an alkaline slagging material on the surface of molten steel to prevent secondary oxidation of the molten steel after the ferrotitanium is melted, and controlling the mass fraction of elements in the molten steel according to the embodiment 1; and finally, reducing the temperature to 1520 ℃, preserving the temperature for 10 minutes, then, after calming for 5 minutes, casting and forming, and after air cooling the casting for 3 hours, cutting off a dead head.
Step 2: heating the cast steel ingot obtained in the step 1 to 1100-;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: heating the steel ingot obtained in the step 3 to 200-7C3And TiC composite reinforced medium manganese wear-resistant steel.
Test methods (Cr, Fe) prepared in this example were tested according to example 17C3The mechanical property and the wear resistance of the TiC composite reinforced medium manganese wear-resistant steel are that the hardness is 59HRC, and the V-shaped testThe impact toughness Aku2 of the sample is more than or equal to 39J/cm2(ii) a The test by an impact abrasive abrasion tester shows that: the wear resistance under the working conditions of low and medium stress impact is 3.9 times that of the common medium manganese steel (Mn 6).
The (Cr, Fe) prepared in example 47C3Compared with the wear resistance of TiC composite reinforced medium manganese wear-resistant steel applied to a medium manganese steel lining plate of a jaw crusher, the wear resistance is found to be 3.9 times that of Mn6 and 3.5 times that of a medium manganese steel lining plate in patent ZL201711174760.4 under the working conditions of low and medium stress impact.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention.

Claims (4)

1. A kind of (Cr, Fe)7C3The TiC composite reinforced medium manganese wear-resistant steel is characterized by comprising, by weight, 0.5-1.6% of C, 0.1-1.0% of Si, 6.0-9.0% of Mn, 3.5-9.5% of Cr, 0.01-1.50% of Ti, 0.001-0.005% of B, 0.04-0.10% of Al, less than or equal to 0.015% of S, less than or equal to 0.015% of P and the balance of iron and inevitable impurity elements.
2. (Cr, Fe) according to claim 17C3The preparation method of the TiC composite reinforced medium manganese wear-resistant steel sequentially comprises smelting, die casting, homogenizing annealing, quenching and tempering; wherein:
step 1: heating low-carbon steel scrap and pig iron to 1550-; adding medium carbon ferrochrome, ferromanganese, ferroboron and ferrosilicon into an induction furnace to melt for 10 minutes, adding metal Al powder to perform deoxidation alloying, adding ferrotitanium, adding an alkaline slagging material on the surface of molten steel to prevent the molten steel from being secondarily oxidized after the ferrotitanium is melted, finally reducing the temperature to 1500-1550 ℃, preserving the temperature for 10 minutes, then calming for 5 minutes, casting and forming, and cutting off a riser after an air-cooled casting is cooled to the temperature lower than 100 ℃;
step 2: carrying out homogenization annealing on the cast steel ingot obtained in the step 1, heating to 1100-1150 ℃, preserving heat for 1-2h according to the thickness of the casting, and finally air-cooling to room temperature;
and step 3: heating the steel ingot obtained in the step 2 to 400-;
and 4, step 4: and (4) heating the steel ingot obtained in the step (3) to 200-400 ℃, preserving the heat for 1.5-2.5h, and cooling the air to room temperature.
3. The method of claim 2, wherein the heat treatment results in austenite, micron-sized (Cr, Fe)7C3And TiC composite structure, micron-sized (Cr, Fe)7C3And TiC particles having a volume fraction total of 10-25% and an average size of 0.3-7 um.
4. The method according to claim 2, wherein (Cr, Fe)7C3The TiC composite reinforced medium manganese wear-resistant steel can achieve the following mechanical properties that the hardness range is 49-59HRC, and the impact toughness Aku2 is more than or equal to 33J/cm2The wear resistance under the medium and low stress impact conditions is 3-4 times that of the common medium manganese steel (Mn 6).
CN201911160876.1A 2019-11-23 2019-11-23 A kind of (Cr, Fe)7C3TiC composite reinforced medium manganese steel and manufacturing method thereof Pending CN111057946A (en)

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Application publication date: 20200424