CN111893393B - Mo-Ti alloy wear-resistant medium manganese steel and preparation method thereof - Google Patents
Mo-Ti alloy wear-resistant medium manganese steel and preparation method thereof Download PDFInfo
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- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 22
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000005098 hot rolling Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000005242 forging Methods 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 description 16
- 239000010936 titanium Substances 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
-
- 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
- C22C38/06—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention relates to Mo-Ti alloy wear-resistant medium manganese steel and a preparation method thereof, wherein the preparation method comprises smelting, namely vacuum induction smelting; forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a slab; hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, rolling at the beginning temperature of 1100-1150 ℃ and the finishing temperature of 830-900 ℃, hot rolling into a sheet through 5-7 passes of hot rolling, and then air cooling to room temperature; hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 600-700 ℃, the heat is preserved in a heating furnace for 1-10 hours, and then the hot rolled plate is rapidly cooled to room temperature by water. The wear-resistant medium manganese steel prepared by the invention has high tensile strength, good plasticity and excellent wear resistance, the tensile strength is 750-1200 MPa, the yield strength is 560-900 MPa, and the total elongation is 20-40%.
Description
Technical Field
The invention belongs to the technical field of medium manganese steel, and particularly relates to Mo-Ti alloy wear-resistant medium manganese steel and a preparation method thereof.
Background
Under the action of larger impact load or contact stress, the surface layer of the high-carbon high-manganese wear-resistant steel is rapidly subjected to work hardening, so that a high-wear-resistant surface layer is generated, and the austenite of the inner layer still maintains good toughness. The characteristic of the high-carbon high-manganese wear-resistant steel enables the high-carbon high-manganese wear-resistant steel to be widely applied to machinery such as metallurgy, mines, railways, electric power, coal and the like for a long time.
In recent years, high manganese steel is difficult to machine, so that the wear resistance is low due to insufficient work hardening capacity under the conditions of low and medium impact wear stress, and the production cost is high. Low alloy wear resistant steels, medium manganese wear resistant steels, and the like have been developed. The medium manganese wear-resistant steel has improved work hardening capacity due to the reduction of manganese content, and the wear resistance is improved, but the toughness is greatly reduced, so that the use life is reduced due to the fracture phenomenon, and the application of the medium manganese wear-resistant steel is limited. Therefore, the development of the medium manganese steel material with high strength, good toughness and wear resistance under the condition of not increasing the production cost has great practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the Mo-Ti alloy wear-resistant medium manganese steel with simple process and the preparation method thereof.
A preparation method of Mo-Ti alloy wear-resistant medium manganese steel sequentially comprises smelting, forging, hot rolling and annealing; the method comprises the following specific steps:
(1) smelting: vacuum induction melting is adopted, and steel ingots are obtained by casting; the steel ingot comprises the following chemical components in percentage by mass: c: 0.20 to 1.0%, Mn: 6.0-10.0%, Al: 0.02 to 1.0%, Si: 0-0.10%, Ti: 0-0.10%, Mo: 0 to 0.20%, and the balance of Fe and inevitable impurities;
(2) forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a plate blank with the cross-sectional dimension of 40mm multiplied by 230 mm;
(3) hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, rolling at the beginning temperature of 1100-1150 ℃ and the finishing temperature of 830-900 ℃, hot rolling into a sheet with the thickness of 3-15 mm by 5-7 passes of hot rolling, and then air cooling to room temperature;
(4) hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 600-700 ℃, and after the hot rolled plate is kept in a heating furnace for 1-10 hours, the hot rolled plate is rapidly cooled to room temperature by water.
The invention also discloses Mo-Ti alloy wear-resistant medium manganese steel obtained by the preparation method.
The steel grade selected by the invention comprises the following components:
carbon: the most cost-effective and effective solid solution strengthening elements in steel are at the same time important elements for stabilizing austenite. Generally, the higher the carbon content of steel, the higher the residual austenite content thereof, the more remarkable the TRIP effect at the time of deformation, and further, the strength, plasticity and work hardening properties are improved. Therefore, the C selected in the invention is 0.20-1.00%.
Manganese: the method mainly expands the austenite phase region of the steel, enables the precipitation line of the proeutectoid ferrite to move to the right, stabilizes austenite, reduces the austenite phase transformation temperature, delays the formation of pearlite, and is beneficial to the increase of the content of residual austenite in the final microstructure. However, too high Mn content results in too stable austenite, which is detrimental to the TRIP effect of the steel. The Mn selected in the invention is 6.0-10.0%.
Silicon: the important ferrite forming elements can obviously increase the activity of carbon atoms in the ferrite, promote the formation of residual austenite and improve the stability of the residual austenite. However, since too high a content of Si lowers the surface quality of TRIP steel, the Si content is designed to be 0.10% or less in the present invention.
Aluminum: mainly influences the distribution state of carbon and manganese in a matrix during reverse phase transformation annealing, influences the stacking fault energy and the mechanical property of residual austenite, can play a role in refining grains, does not influence the surface quality of steel, and can partially replace silicon. Meanwhile, the aluminum alloying can remarkably shorten the heat treatment time of the steel and accelerate the recrystallization process of the steel. The Al content in the invention is 0.02-1.0%.
Titanium: an important microalloy element, TiN which is very stable at high temperature, prevents austenite grains from growing before hot working, and obviously prevents recrystallization in the form of solid solution or fine TiC particles in microalloy steel at lower temperature to play a role in precipitation strengthening. Therefore, the Ti content in the invention is designed to be less than or equal to 0.10 percent.
Molybdenum: the steel material has raised hardenability, influence of austenite to ferrite conversion kinetics, fine grain structure, raised hardenability and heat strength, and high strength and creep resistance. The addition of Mo element in Ti alloy can obviously enhance the precipitation strengthening effect of carbide particles. In the invention, the Mo content is designed to be less than or equal to 0.20 percent.
Compared with the prior art, the invention has the following advantages:
(1) the steel has simple chemical components, and the microalloy elements Ti and Mo are added, so that on one hand, the strength and the wear resistance of the steel are improved through precipitation strengthening, and on the other hand, austenite crystal boundaries are pinned at high temperature to prevent austenite from coarsening, thus being beneficial to obtaining fine and uniform tissues after rolling and improving the strength and the low-temperature toughness of the steel.
(2) The heat treatment process for annealing the hot rolled plate of the steel aims to change the structure of the hot rolled steel, increase the austenite phase proportion, improve the plasticity of the material, increase the number of precipitates and improve the wear resistance.
(3) The steel has excellent mechanical properties, the tensile strength is 750-1200 MPa, the yield strength is 560-900 MPa, and the total elongation is 20-40%.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. The examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1: Mo-Ti alloy wear-resistant medium manganese steel and preparation method thereof
The preparation method sequentially comprises smelting, forging, hot rolling and annealing; the method comprises the following specific steps:
(1) smelting: vacuum induction melting is adopted, and steel ingots are obtained by casting; the chemical components of the steel ingot are as follows by mass percent: 0.21%, Mn: 6.0%, Al: 0.07%, Si: 0.05%, Ti: 0.05%, Mo: 0.10%, and the balance of Fe and inevitable impurities.
(2) Forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a plate blank with the cross-sectional dimension of 40mm multiplied by 230 mm;
(3) hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, carrying out initial rolling at 1100 ℃ and final rolling at 830 ℃, carrying out 7-pass hot rolling, carrying out hot rolling to obtain a sheet with the thickness of 5mm, and then carrying out air cooling to room temperature;
(4) hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 630 ℃, and after the hot rolled plate is kept in a heating furnace for 8 hours, the hot rolled plate is rapidly cooled to room temperature by water; obtaining the Mo-Ti alloy wear-resistant medium manganese steel.
Through detection, the Mo-Ti alloy wear-resistant medium manganese steel obtained in the embodiment has the tensile strength of 860MPa, the yield strength of 610MPa and the total elongation of 38.5%.
Example 2: Mo-Ti alloy wear-resistant medium manganese steel and preparation method thereof
The preparation method sequentially comprises smelting, forging, hot rolling and annealing; the method comprises the following specific steps:
(1) smelting: vacuum induction melting is adopted, and steel ingots are obtained by casting; the chemical components of the steel ingot are as follows by mass percent: 0.23%, Mn: 8.0%, Al: 0.07%, Si: 0.06%, Ti: 0.1%, Mo: 0.20%, and the balance of Fe and inevitable impurities.
(2) Forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a plate blank with the cross-sectional dimension of 40mm multiplied by 230 mm;
(3) hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, rolling at the beginning temperature of 1150 ℃ and the finishing temperature of 850 ℃, performing 7-pass hot rolling, hot rolling to form a sheet with the thickness of 5mm, and then air cooling to room temperature;
(4) hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 650 ℃, and after the hot rolled plate is kept warm in a heating furnace for 5 hours, the hot rolled plate is rapidly cooled to room temperature by water; obtaining the Mo-Ti alloy wear-resistant medium manganese steel.
Through detection, the Mo-Ti alloy wear-resistant medium manganese steel obtained in the embodiment has the tensile strength of 1107MPa, the yield strength of 860MPa and the total elongation of 33.5%.
Example 3: Mo-Ti alloy wear-resistant medium manganese steel and preparation method thereof
The preparation method sequentially comprises smelting, forging, hot rolling and annealing; the method comprises the following specific steps:
(1) smelting: vacuum induction melting is adopted, and steel ingots are obtained by casting; the chemical components of the steel ingot are as follows by mass percent: 0.85%, Mn: 9.0%, Al: 0.03%, Si: 0.02%, Ti: 0.9%, Mo: 0.05%, and the balance of Fe and inevitable impurities.
(2) Forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a plate blank with the cross-sectional dimension of 40mm multiplied by 230 mm;
(3) hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, carrying out initial rolling at the temperature of 1130 ℃ and final rolling at the temperature of 890 ℃, carrying out hot rolling for 5 times to obtain a sheet with the thickness of 12mm, and then carrying out air cooling to room temperature;
(4) hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 680 ℃, and after heat preservation is carried out in a heating furnace for 2 hours, the hot rolled plate is rapidly cooled to room temperature by water; obtaining the Mo-Ti alloy wear-resistant medium manganese steel.
Through detection, the Mo-Ti alloy wear-resistant medium manganese steel obtained in the embodiment has the tensile strength of 985MPa, the yield strength of 750MPa and the total elongation of 28%.
Claims (1)
1. The preparation method of the Mo-Ti alloy wear-resistant medium manganese steel is characterized by sequentially comprising the steps of smelting, forging, hot rolling and annealing; the method comprises the following specific steps:
(1) smelting: vacuum induction melting is adopted, and steel ingots are obtained by casting; the chemical components of the steel ingot are as follows by mass percent: 0.23%, Mn: 8.0%, Al: 0.07%, Si: 0.06%, Ti: 0.1%, Mo: 0.20%, the balance being Fe and inevitable impurities;
(2) forging: heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging into a plate blank with the cross-sectional dimension of 40mm multiplied by 230 mm;
(3) hot rolling: heating the plate blank in a high-temperature furnace from room temperature to 1200 ℃, preserving heat for 2h, rolling at the beginning temperature of 1150 ℃ and the finishing temperature of 850 ℃, performing 7-pass hot rolling, hot rolling to form a sheet with the thickness of 5mm, and then air cooling to room temperature;
(4) hot treatment after hot rolling: the annealing temperature of the hot rolled plate is 650 ℃, and after the hot rolled plate is kept warm in a heating furnace for 5 hours, the hot rolled plate is rapidly cooled to room temperature by water; obtaining the Mo-Ti alloy wear-resistant medium manganese steel.
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| CN109082590A (en) * | 2018-08-23 | 2018-12-25 | 东北大学 | A kind of high-strength plasticity hot rolling medium managese steel plate and its critical zone roll preparation method |
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| CN110066964A (en) * | 2019-04-09 | 2019-07-30 | 东北大学 | A kind of superhigh intensity medium managese steel and its warm-rolling preparation method |
| CN110592490A (en) * | 2019-09-17 | 2019-12-20 | 北京科技大学 | A hot-rolled medium-manganese steel with high-strength plastic product and no plastic instability and its preparation method |
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