CN114774651A - Heat treatment design of YZ25SiMnMoV flat steel for railway bearing - Google Patents
Heat treatment design of YZ25SiMnMoV flat steel for railway bearing Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 title claims abstract description 26
- 238000013461 design Methods 0.000 title claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000011651 chromium Substances 0.000 claims abstract description 6
- 239000010949 copper Substances 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000011733 molybdenum Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000011593 sulfur Substances 0.000 claims abstract description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 28
- 230000000171 quenching effect Effects 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 23
- 238000005496 tempering Methods 0.000 claims description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- 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
- C21D2211/008—Martensite
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to the technical field of steel for railways, and particularly relates to a heat treatment design of YZ25SiMnMoV flat steel for railway bearing, which comprises the following components: 0.23-0.27% of carbon, 1.00-1.20% of silicon, 1.60-1.80% of manganese, 0.08-0.12% of vanadium, 003-0.009% of aluminum, 0.0.13-0.16% of chromium, less than or equal to 0.10% of copper, less than or equal to 0.015% of phosphorus, less than or equal to 0.003% of sulfur, 0.33-0.37% of molybdenum and less than or equal to 0.10% of Ni.
Description
Technical Field
The invention relates to the technical field of steel for railways, in particular to a heat treatment design of YZ25SiMnMoV flat steel for railway bearing.
Background
The flat steel is a steel material with the width of 12-300mm, the thickness of 4-60mm, the cross section of rectangle and a slight truncated edge. The flat steel mainly comprises carbon structural steel, high-quality carbon structural steel and low-alloy high-strength structural steel. The flat steel can be finished steel products, and can also be used as a blank of a welded pipe and a thin slab for a pack-rolled thin plate. The flat steel can be used as a finished material for manufacturing hoop iron, tools and mechanical parts, and can be used as a house frame structural member, an escalator and the like in construction.
The existing flat steel for the railway bearing has some defects in the using process, such as lower safety, poor mechanical property, poor tensile property and short service life, and therefore the novel YZ25SiMnMoV flat steel for the railway bearing is provided for solving the problems.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention is provided in view of the problems of the existing YZ25SiMnMoV flat steel for railway load bearing.
Therefore, the invention aims to provide a heat treatment design of YZ25SiMnMoV flat steel for railway bearing, which has better mechanical property, high structural strength, strong tensile property, long service life and higher safety in the using process.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a railway bears the heat treatment design of YZ25SiMnMoV band steel, it includes carbon, silicon, manganese, vanadium, aluminium, chromium, copper, phosphorus, sulphur, molybdenum and Ni according to the formulation concrete match proportion, use as the band steel for weighing of railway, have better mechanical properties and tensile strength, have long performance life, have stronger shock resistance at the same time, the security is higher;
wherein the content of the first and second substances,
the carbon is prepared from the following components in parts by weight: 0.23-0.27%;
the silicon is prepared from the following components in parts by weight: 1.00-1.20%;
the manganese is prepared from the following components in parts by weight: 1.60-1.80%;
the vanadium is prepared from the following components in parts by weight: 0.08-0.12%;
the aluminum is prepared from the following components in parts by weight: 003-0.009%;
the chromium is prepared from the following components in parts by weight: 0.13-0.16%;
the copper is prepared from the following components in parts by weight: less than or equal to 0.10 percent;
the phosphorus is prepared from the following components in parts by weight: less than or equal to 0.015 percent;
the sulfur is prepared from the following components in parts by weight: less than or equal to 0.003 percent;
the molybdenum comprises the following components in parts by weight: 0.33 to 0.37 percent;
the Ni is prepared from the following components in parts by weight: less than or equal to 0.10 percent.
As a preferred scheme of the heat treatment design of the YZ25SiMnMoV flat steel for the railway bearing weight, the invention comprises the following steps: the mechanical properties of the YZ25SiMnMoV flat steel for the railway bearing are as follows: rm is more than or equal to 1200MPa, Rel is more than or equal to 950MPa, A is more than or equal to 8 percent, and the impact energy AKV (at-20 ℃) is more than or equal to 15J.
As a preferred scheme of the heat treatment design of the YZ25SiMnMoV flat steel for the railway bearing weight, the invention comprises the following steps: the method comprises the following steps:
step 1: in order to obtain better comprehensive mechanical properties, a process route of normalizing, quenching and tempering is formulated for a heat treatment system of YZ25SiMnMoV flat steel for railway bearing, wherein the main purpose of normalizing is to refine crystal grains, the purpose of quenching is to enable the YZ25SiMnMoV flat steel to obtain a martensite structure, and the purpose of tempering is to reduce the brittleness of quenched steel, eliminate internal stress and obtain the final properties and stability required by the structure;
step 2: designing a heat treatment process: the normalizing heat treatment temperature of the heat treatment process is selected to be 925 ℃, 935 ℃ and 945 ℃, the temperature is kept for 2 hours, and the furnace is cooled to the room temperature. The quenching temperatures are respectively set to 895 ℃, 915 ℃ and 935 ℃, and the sample is oil-quenched to room temperature after being kept for 2 hours. The tempering temperature is selected to be 390 ℃, 410 ℃ and 430 ℃, and the tempering temperature is kept for 4.5 hours and then air-cooled to the room temperature.
Compared with the prior art, the invention has the beneficial effects that: the material has better mechanical property and tensile property, long service life, stronger impact resistance and higher safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 shows the normalized structure (a), (b) of YZ25SiMnMoV flat steel of the invention at 925 ℃; (c)935 ℃; (d)945 ℃;
FIG. 2 is a graph of tensile strength as a function of normalizing temperature for the invention;
FIG. 3 is a graph of the variation of impact power at-20 ℃ with normalizing temperature according to the invention;
FIG. 4 is an optical microscope microstructure under different quenching conditions according to the present invention;
FIG. 5 is a graph showing the variation of tensile strength with quenching temperature according to the present invention;
FIG. 6 is a graph of the change in impact power with quenching temperature according to the present invention;
FIG. 7 is a graph of tensile strength as a function of tempering temperature for a transverse sample according to the present invention; (b) longitudinal sampling;
FIG. 8 is a graph of the variation of tensile strength with tempering temperature of the present invention (a) transverse samples; (b) longitudinal sampling;
FIG. 9 is a graph of the tensile strength as a function of tempering temperature for a transverse sample according to the present invention; (b) longitudinal sampling.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
A thermal treatment design of YZ25SiMnMoV flat steel for railway bearing comprises the following components: 0.23-0.27% of carbon, 1.00-1.20% of silicon, 1.60-1.80% of manganese, 0.08-0.12% of vanadium, 003-0.009% of aluminum, 78-0.16% of chromium 0.0.13, less than or equal to 0.10% of copper, less than or equal to 0.015% of phosphorus, less than or equal to 0.003% of sulfur, 0.33-0.37% of molybdenum and less than or equal to 0.10% of Ni.
Wherein: the mechanical properties of the YZ25SiMnMoV flat steel for the railway bearing are as follows: rm is more than or equal to 1200MPa, Rel is more than or equal to 950MPa, A is more than or equal to 8 percent, and the impact energy AKV (at minus 20 ℃) is more than or equal to 15J.
Wherein: the method comprises the following steps:
step 1: in order to obtain better comprehensive mechanical properties, a process route of normalizing, quenching and tempering is formulated for a heat treatment system of YZ25SiMnMoV flat steel for railway bearing, wherein the main purpose of normalizing is to refine crystal grains, the purpose of quenching is to enable the YZ25SiMnMoV flat steel to obtain a martensite structure, and the purpose of tempering is to reduce the brittleness of quenched steel, eliminate internal stress and obtain the final properties and stability required by the structure;
step 2: designing a heat treatment process: the normalizing heat treatment temperature of the heat treatment process is selected to be 925 ℃, 935 ℃ and 945 ℃, the temperature is kept for 2 hours, and the furnace is cooled to the room temperature. The quenching temperatures are respectively set to 895 ℃, 915 ℃ and 935 ℃, and the sample is oil-quenched to room temperature after being kept for 2 hours. The tempering temperature is selected to be 390 ℃, 410 ℃ and 430 ℃, and the air cooling is carried out to the room temperature after the heat preservation is carried out for 4.5 h.
Results of the experiment
1. Effect of normalizing Process on Material texture and Properties
1.1 normalizing by adopting the heat treatment test scheme of the second step, wherein the microstructure of the material is shown in figure 1 after the YZ25SiMnMoV flat steel is normalized at the temperature of 925 ℃, 935 ℃ and 945 ℃ respectively. FIGS. 1(a), (b) show normalized tissues at 925 ℃ and (c), (d) show normalized tissues at 935 ℃ and 945 ℃. It can be seen that the structure after normalizing at 925 ℃ is mainly bainite and a small amount of pearlite. As the normalizing temperature increases, bainite gradually coarsens, the pearlite structure increases, and massive ferrite occurs.
1.2 the tensile strength of the YZ25SiMnMoV flat steel at the three normalizing temperatures is firstly increased and then decreased along with the increase of the normalizing temperature, and when the normalizing temperature is 935 ℃, the tensile strength is the highest, and the highest value is 1658 MPa.
1.3 comparing impact toughness results at different normalizing temperatures shows that the normalizing temperature has little influence on the impact toughness.
2. Influence of quenching process on material structure and properties
2.1 quenching by adopting the heat treatment test scheme of the second step, and respectively quenching the YZ25SiMnMoV flat steel at 895 ℃, 915 ℃ and 935 ℃. The result shows that under the same normalizing temperature, quenching and tempering structures with different quenching temperatures are mostly bainite structures, the residual austenite structures are few, the bainite structures and the residual austenite are obviously changed along with the slow increase of the quenching temperature, the bainite is fine in shape, the quantity of the residual austenite is reduced, and the stage with the best structure state is quenching 915 ℃.
2.2 the YZ25SiMnMoV flat steel is respectively quenched at 895 ℃, 915 ℃, 935 ℃ and 895 ℃, the tensile strength is highest, the transverse sample reaches 1475.0MPa, the longitudinal sample is 1395.4MPa, the transverse sample is 1355.1MPa and the longitudinal sample is 1300.7MPa at 915 ℃, the transverse sample is 1373.8MPa and the longitudinal sample is 1326.3MPa at 935 ℃. Compared with the longitudinal sample under the same condition, the transverse sample has higher value than the longitudinal sample, and the tensile property of the transverse sample is better.
2.3YZ25SiMnMoV flat steel, when the impact energy is respectively quenched at 895 ℃, 915 ℃ and 935 ℃, under the technical condition of quenching at 935 ℃, the maximum impact energy (KV 2/J) of a transverse sample is 19.2, the value of the longitudinal sample impact energy is 16.2, when the quenching temperature is 895 ℃, the value of the transverse sample impact energy is 17.3, the value of the longitudinal sample impact energy is 15.0, when the quenching temperature is 915 ℃, the value of the transverse sample impact energy is 18.2, and the value of the longitudinal sample impact energy is 16.0. The impact energy performance of the transverse sample is superior to that of the longitudinal sample under the same process condition.
3. Influence of quenching process on material structure and properties
1.1YZ25SiMnMoV flat steel tensile strength under the technology of normalizing at 935 ℃ plus quenching at 895 ℃, the tensile strength is firstly increased and then decreased, when the tempering temperature reaches 410 ℃, the maximum transverse sample tensile strength is 1475.01MPa, the maximum longitudinal sample tensile strength is 1395.44MPa, when the tempering temperature is 390 ℃, the maximum transverse sample tensile strength is 1405.17MPa, the maximum longitudinal sample tensile strength is 1357.82MPa, and when the tempering temperature is 430 ℃, the maximum transverse sample tensile strength is 1369.75MPa, and the maximum longitudinal sample tensile strength is 1338.61 MPa.
1.2YZ25SiMnMoV flat steel tensile strength under the technology of normalizing 935 ℃ plus quenching 915 ℃, the tensile strength of the transverse sample and the longitudinal sample are opposite to the change of the tempering temperature, when the tempering temperature is increased, the change of the transverse sample is firstly increased and then decreased, and the change of the longitudinal sample is firstly decreased and then increased.
1.3YZ25SiMnMoV flat steel tensile strength is lower and lower along with the rise of tempering temperature under the process of normalizing at 935 ℃ plus quenching at 935 ℃.
The heat treatment experiment result shows that the best heat treatment system designed by the YZ25SiMnMoV flat steel is as follows: the normalizing process is carried out by keeping the temperature at 935 ℃ for 2h and cooling to room temperature; the quenching process is that the temperature is kept for 2h at 915 ℃, and the quenching process is carried out to room temperature; the tempering process is that the temperature is kept at 410 ℃ for 4.5h, and then the air is cooled to room temperature.
While the invention has been described with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of this invention can be used in any combination as long as there is no structural conflict, and the combination is not exhaustively described in this specification merely for the sake of brevity and resource savings. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (3)
1. The utility model provides a railway bearing uses thermal treatment design of YZ25SiMnMoV band steel which characterized in that: the steel comprises carbon, silicon, manganese, vanadium, aluminum, chromium, copper, phosphorus, sulfur, molybdenum and Ni which are matched according to a specific matching proportion of a formula, is used as flat steel for weighing railways, and has the advantages of better mechanical property and tensile property, long service life, stronger impact resistance and higher safety;
wherein the content of the first and second substances,
the carbon is prepared from the following components in parts by weight: 0.23-0.27%;
the silicon is prepared from the following components in parts by weight: 1.00-1.20%;
the manganese is prepared from the following components in parts by weight: 1.60-1.80%;
the vanadium is prepared from the following components in parts by weight: 0.08-0.12%;
the aluminum is prepared from the following components in parts by weight: 003-0.009%;
the chromium is prepared from the following components in parts by weight: 0.13-0.16%;
the copper is prepared from the following components in parts by weight: less than or equal to 0.10 percent;
the phosphorus is prepared from the following components in parts by weight: less than or equal to 0.015 percent;
the sulfur is prepared from the following components in parts by weight: less than or equal to 0.003 percent;
the molybdenum comprises the following components in parts by weight: 0.33-0.37%;
the Ni is prepared from the following components in parts by weight: less than or equal to 0.10 percent.
2. The heat treatment design of YZ25SiMnMoV flat steel for railway bearing weight according to claim 1, characterized in that: the mechanical properties of the YZ25SiMnMoV flat steel for the railway bearing are as follows: rm is more than or equal to 1200MPa, Rel is more than or equal to 950MPa, A is more than or equal to 8 percent, and the impact energy AKV (at minus 20 ℃) is more than or equal to 15J.
3. The heat treatment design of YZ25SiMnMoV flat steel for railway bearing weight according to claim 1, characterized in that: the method comprises the following steps:
step 1: in order to obtain better comprehensive mechanical properties, a process route of normalizing, quenching and tempering is formulated for a heat treatment system of YZ25SiMnMoV flat steel for railway bearing, wherein the main purpose of normalizing is to refine crystal grains, the purpose of quenching is to enable the YZ25SiMnMoV flat steel to obtain a martensite structure, and the purpose of tempering is to reduce the brittleness of quenched steel, eliminate internal stress and obtain the final properties and stability required by the structure;
and 2, step: designing a heat treatment process: the normalizing heat treatment temperature of the heat treatment process is selected to be 925 ℃, 935 ℃ and 945 ℃, the temperature is kept for 2 hours, and the furnace is cooled to the room temperature. The quenching temperatures are respectively set to 895 ℃, 915 ℃ and 935 ℃, and the sample is oil-quenched to room temperature after being kept for 2 hours. The tempering temperature is selected to be 390 ℃, 410 ℃ and 430 ℃, and the tempering temperature is kept for 4.5 hours and then air-cooled to the room temperature.
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