CN113943901B - Heat-treated vanadium-containing high-boron high-speed steel and heat treatment method thereof - Google Patents
Heat-treated vanadium-containing high-boron high-speed steel and heat treatment method thereof Download PDFInfo
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Abstract
The invention discloses a heat-treated vanadium-containing high-boron high-speed steel and a heat treatment method thereof, wherein the vanadium-containing high-boron high-speed steel is quenched at 1010-1060 ℃ to obtain a quenched part; and performing twice tempering treatment on the quenched part, and air-cooling to room temperature to obtain the vanadium-containing high-boron high-speed steel subjected to heat treatment. According to the invention, the vanadium is added and the heat treatment process is adopted to improve the form of boron carbide, promote the matrix strengthening, obtain the vanadium-containing high-boron high-speed steel with excellent obdurability, and apply the vanadium-containing high-boron high-speed steel subjected to heat treatment to actual production to adapt to severe working conditions.
Description
Technical Field
The invention belongs to the technical field of alloy heat treatment, and particularly relates to heat-treated vanadium-containing high-boron high-speed steel and a heat treatment method thereof.
Background
The high-speed steel is a wear-resistant and heat-resistant tool steel having secondary hardening properties and is suitable for high-speed cutting. The high-speed steel contains a large amount of strong carbide forming elements and has the characteristics of high hardness, excellent wear resistance and heat resistance and the like. The high-boron high-speed steel is a novel high-speed steel formed by adding a proper amount of boron on the basis of common high-speed steel and reducing the content of Mo, W and other alloy elements in the high-speed steel. The high-boron high-speed steel has high hardness, is an ideal roller material, stabilizes the boride type in the high-boron high-speed steel structure and reduces the content of alloy elements, thereby improving the performance of the alloy. The high-temperature quenching and tempering heat treatment is an important means for effectively improving the hard toughness of the high-speed steel by changing the internal microstructure. In the case of high boron high speed steel, the properties are not only related to the composition but also to the heat treatment. The solubility of boron in high-speed steel is very low, most of boron is precipitated in the high-speed steel as boron carbide with high hardness and good stability, and the boron carbide is coarse and is distributed in a continuous net shape, so that the grain boundary is embrittled, and the strength and the toughness are reduced. Therefore, it is necessary to convert the hard phase in the alloy structure from continuously distributed reticular boron-carbon compounds into isolated distributed particles after heat treatment by alloying and assisting with subsequent heat treatment process, and dissolve the edge of the hard phase under the action of high temperature, so as to promote dispersion and precipitation of fine secondary strengthening particles in the tempering process, form a complex phase alloy structure with coexistent strong and tough metal matrix and round isolated hard phase, and promote the strengthening and toughening of the alloy and high hardness.
Vanadium is an important alloying element for improving the wear resistance and red hardness of high-speed steel, and is a strong carbide forming element. Vanadium in the high speed steel is partially dissolved in the matrix to form a fine carbide phase with high hardness and high thermal stability. In addition, the dispersed and fine vanadium carbide can be used as nucleation particles of austenite, and has the functions of refining the structure and strengthening the steel matrix. The improvement of the heat treatment process of the vanadium-containing high-boron high-speed steel can further improve the comprehensive mechanical property of the high-boron high-speed steel.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides the heat-treated vanadium-containing high-boron high-speed steel and the heat treatment method thereof.
The invention adopts the following technical scheme:
a heat treatment method of vanadium-containing high-boron high-speed steel comprises the steps of quenching the vanadium-containing high-boron high-speed steel at 1010-1060 ℃ to obtain a quenched part; and performing twice tempering treatment on the quenched part, and air-cooling to room temperature to obtain the vanadium-containing high-boron high-speed steel subjected to heat treatment.
Specifically, the vanadium-containing high-boron high-speed steel comprises the following components in percentage by weight:
c: 0.37-0.44%, B:1.44% -1.61%, cr:4.77% -4.83%, si: 0.58-0.68%, mn: 0.61-0.80%, W:1.16% -1.24%, mo:0.63% -0.67%, ti: 0.07-0.12%, al:0.58% -0.63%, V: 1.00-3.00 percent, and the balance of Fe and inevitable trace impurities.
Specifically, the heat preservation time of the quenching treatment is 110-150 min.
Specifically, the cooling mode of the quenching treatment is room temperature oil cooling.
Specifically, the temperature of the first tempering treatment is increased from room temperature to 510-550 ℃, and the temperature rise time is 100-130 min.
Specifically, the heat preservation time of the first tempering treatment is 1.5-2.5 h.
Specifically, the temperature of the second tempering treatment is increased from room temperature to 450-490 ℃, and the temperature rise time is 100-130 min.
Specifically, the heat preservation time of the second tempering treatment is 3.5-4.5 h.
The other technical scheme of the invention is that the vanadium-containing high-boron high-speed steel is subjected to heat treatment.
Specifically, the room temperature hardness is 63.4-66.2 HRC.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a vanadium-containing high-speed steel heat treatment method, which improves the performance of high-speed steel by quenching and twice tempering, so that the vanadium-containing high-speed steel has higher hardness and good wear resistance, opens up a new idea for further application of the vanadium-containing high-speed steel under severe working conditions, the heat treatment temperature of a piece to be treated by quenching is 1010-1060 ℃, so that boron carbide is partially dissolved, necking and local fracture occur, cluster spheroidization and isolation are realized under the drive of high-temperature diffusion dissolution and interfacial tension, the form of boride are favorably improved, the toughness of the boride is improved, dissolved alloy elements are dissolved in austenite, the hardenability of alloy is improved, the alloy matrix is transformed to a tough martensite matrix, the boron carbide obtains good supporting effect, the vanadium-containing high-speed steel with high hardness and good wear resistance is obtained, air cooling is carried out after tempering, the piece can be cooled in air for enough time, and the vanadium-containing high-speed steel heat treatment piece with excellent performance is obtained.
Furthermore, 0.37-0.44% of carbon is added to form carbide with the alloy, so that the hardness and the wear resistance of the alloy are improved, and the alloy is more solid-dissolved in a matrix. And 1.44% -1.61% of B is added, so that ideal eutectic boride can be obtained, and the structure performance of the eutectic boride is excellent. By adding 0.61-0.80% of Mn, the quality of the steel can be improved, the hot brittleness of the steel can be eliminated, and the overheating sensitivity and the temper brittleness of the material caused by excessive Mn content can be avoided. 0.58 to 0.68 percent of Si is added, so that the structure can be refined, the hardness and the strength of ferrite and austenite are improved, and the elastic limit, the yield strength and the yield ratio of the material are obviously improved. By adding 1.16 to 1.24 percent of W, the hot hardness of the high-speed steel can be improved, and martensite with high tungsten can be obtained. By adding 0.63 to 0.67 percent of Mo, the hardenability, the hot hardness and the hardness of the high-speed steel can be improved. The hardenability of the high-speed steel can be improved by adding 4.77-4.83% of Cr. 0.58 to 0.63 percent of Al element is added, so that the cutting performance and the high-temperature oxidation resistance of the high-speed steel can be improved. The addition of 0.07-0.12% of Ti element can improve the structure of high-speed steel and improve the strength and toughness of the high-speed steel. The addition of 1.00-3.00% of V element can improve the wear resistance and red hardness of the high-speed steel material, and part of formed vanadium carbide can refine the structure and play a role in reinforcing the steel.
Furthermore, the heat preservation time is 110-150 min, so that the temperature inside and outside the quenching heat treatment piece is uniform, the austenite phase transformation is completed, the structure does not have the phenomena of decarburization and boron removal due to the heat preservation time, the structure phase transformation is sufficient, the boride is distributed uniformly in an isolated manner, and the quenching heat treatment effect is better played.
Furthermore, room temperature oil cooling is carried out after quenching, so that the quenching treatment piece is cooled at a lower speed, the cracking tendency of the workpiece is reduced, the good quenching performance is ensured, and the dispersion precipitation of fine and dispersed secondary boron carbide is promoted.
Furthermore, the primary tempering process is to raise the temperature from room temperature to 510-550 ℃, so that the quenching process is matched with high-temperature tempering for quenching and tempering, the quenched and tempered vanadium-containing high-boron high-speed steel workpiece obtains a certain comprehensive mechanical property matched with strength, hardness and good plastic toughness, the temperature rise time is 100-130 min, the uniform heating inside and outside the vanadium-containing high-boron high-speed steel tempering treatment piece is ensured, and good conditions are created for further tempering.
Furthermore, the one-time tempering heat preservation time is 1.5-2.5 h, so that the temperature of the surface and the core of the high-boron high-speed steel tempering treatment piece is uniform and consistent, the structure transformation is fully carried out during solid phase transformation, the quenching stress is completely eliminated, and the tempering heat treatment performance is improved.
Further, the secondary tempering is increased from room temperature to 450-490 ℃, so that the tempering treatment piece obtains high yield strength, and further obtains good matching of high elastic limit and fatigue limit, thereby further improving the comprehensive performance of the heat treatment piece, the temperature rise time is 100-130 min, and the internal and external heating uniformity of the vanadium-containing high-boron high-speed steel tempering treatment piece is ensured.
Furthermore, the secondary tempering heat preservation time is 3.5-4.5 h, the stress is more fully eliminated by prolonging the tempering heat preservation time, and the tempering is more fully performed.
In conclusion, the heat-treated vanadium-containing high-boron high-speed steel and the heat treatment method thereof provided by the invention have the advantages that the vanadium-containing high-boron high-speed steel with higher hardness and good wear resistance is obtained through quenching and twice tempering processes, and is further suitable for conditions under severe working conditions, so that a new idea is provided for further application and development of the vanadium-containing high-boron high-speed steel.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a distribution and morphology chart of the structure and precipitated particles after the heat treatment in example 1.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, all the embodiments and preferred methods mentioned herein can be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, all the technical features mentioned herein and preferred features may be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, the percentage (%) or parts means the weight percentage or parts by weight with respect to the composition, if not otherwise specified.
In the present invention, the components referred to or the preferred components thereof may be combined with each other to form a novel embodiment, if not specifically stated.
In the present invention, unless otherwise stated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "6 to 22" indicates that all real numbers between "6 to 22" have been listed herein, and "6 to 22" is only a shorthand representation of the combination of these numbers.
The "ranges" disclosed herein may have one or more lower limits and one or more upper limits, respectively, in the form of lower limits and upper limits.
As used herein, the term "and/or" refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
In the present invention, unless otherwise specified, the individual reactions or operation steps may be performed sequentially or may be performed in sequence. Preferably, the reaction processes herein are carried out sequentially.
Unless otherwise defined, technical and scientific terms used herein have the same meaning as is familiar to those skilled in the art. In addition, any methods or materials similar or equivalent to those described herein can also be used in the present invention.
The invention provides a heat-treated vanadium-containing high-boron high-speed steel and a heat treatment method thereof, wherein the heat treatment process is quenching treatment and twice tempering treatment, the form of boron carbide is improved through the heat treatment process, matrix strengthening is promoted, and various vanadium-containing high-boron high-speed steels with excellent performance are obtained, so that the hardness of the vanadium-containing high-boron high-speed steel reaches above 63HRC, and the hardness is improved by above 10HRC compared with the vanadium-containing high-speed steel which is not subjected to heat treatment. . The vanadium-containing high-boron high-speed steel subjected to heat treatment is applied to actual production, and is more suitable for severe working conditions, so that a new idea is provided for further application and development of the vanadium-containing high-boron high-speed steel.
The invention relates to a heat treatment method of vanadium-containing high-boron high-speed steel, which comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching workpiece to be treated;
the vanadium-containing high-boron high-speed steel comprises the following components in percentage by weight:
c:0.37% -0.44%, B:1.44% -1.61%, cr:4.77% -4.83%, si: 0.58-0.68%, mn: 0.61-0.80%, W:1.16% -1.24%, mo:0.63% -0.67%, ti: 0.07-0.12%, al:0.58% -0.63%, V: 1.00-3.00 percent, and the balance of Fe and inevitable trace impurities.
S2, raising the temperature of the to-be-quenched piece to be quenched in the step S1 to 1010-1060 ℃, then preserving the heat for 110-150 min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched piece;
and S3, tempering the quenched part obtained in the step S2, wherein the tempering comprises primary tempering and secondary tempering, and air cooling to room temperature to obtain a final heat-treated part.
The primary tempering process comprises the following steps:
raising the temperature from the room temperature to 510-550 ℃, keeping the temperature for 1.5-2.5 h, and then cooling to the room temperature.
The secondary tempering process comprises the following steps:
raising the temperature from the room temperature to 450-490 ℃, keeping the temperature for 3.5-4.5 h, and then cooling to the room temperature.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.37%, B:1.44%, cr:4.77%, si:0.58%, mn:0.61%, W:1.16%, mo:0.63%, ti:0.07%, al:0.58%, V:1.00 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the piece to be quenched in the step S1 to 1010 ℃, keeping the temperature for 110min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched piece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 510 ℃ for 100min, keep the temperature for 1.5h, and then cool the quenched part in air to room temperature; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 450 ℃, raising the temperature for 100min, keeping the temperature for 3.5h, and then air-cooling to room temperature to obtain the final heat-treated piece.
Referring to FIG. 1, a distribution diagram of structure and secondary particle precipitation after heat treatment of vanadium-containing high boron high speed steel, M-martensite; p-secondary particle precipitation; k is 1 Fe-rich M 2 B(M＝Cr，Mo，W，V)；K 2 M rich in Mo and W 2 B, secondary precipitated particles which are finely distributed are precipitated to form a complex phase alloy structure with a tough metal matrix and a round isolated hard phase coexisting, so that the toughness and high hardness of the alloy are promoted.
Example 2
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.40%, B:1.50%, cr:4.80%, si:0.63%, mn:0.68%, W:1.20%, mo:0.65%, ti:0.09%, al:0.60%, V:2.05 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the workpiece to be quenched in the step S1 to 1050 ℃, then preserving the temperature for 120min, and performing room-temperature oil cooling to complete quenching treatment to obtain a quenched workpiece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 525 ℃ for 120min, and air-cool the quenched part to room temperature after heat preservation for 2 h; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 475 ℃, raising the temperature for 120min, keeping the temperature for 4h, and then cooling in air to room temperature to obtain the final heat-treated part.
Example 3
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.44%, B:1.61%, cr:4.83%, si:0.68%, mn:0.80%, W:1.24%, mo:0.67%, ti:0.12%, al:0.63%, V:3.00 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the to-be-quenched workpiece to 1060 ℃, keeping the temperature for 150min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched workpiece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 550 ℃, the temperature rise time is 130min, and the temperature is kept for 2.5h and then air-cooled to room temperature; and the secondary tempering process comprises the steps of raising the temperature from the room temperature to 490 ℃, keeping the temperature for 130min, keeping the temperature for 4.5h, and then air-cooling to the room temperature to obtain the final heat-treated piece.
Example 4
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.38%, B:1.47%, cr:4.79%, si:0.66%, mn:0.74%, W:1.17%, mo:0.64%, ti:0.11%, al:0.60%, V:1.44 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the piece to be quenched in the step S1 to 1025 ℃, preserving the heat for 136min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched piece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 541 ℃ for 115min, keep the temperature for 1.7h and then cool the quenched part to room temperature in air; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 488 ℃, raising the temperature for 125min, keeping the temperature for 4.2h, and then air-cooling to room temperature to obtain the final heat-treated piece.
Example 5
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching workpiece to be treated, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.42%, B:1.55%, cr:4.77%, si:0.60%, mn:0.76%, W:1.23%, mo:0.64%, ti:0.08%, al:0.62%, V:1.88 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the piece to be quenched in the step S1 to 1033 ℃, preserving the heat for 148min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched piece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 518 ℃ for 127min, preserve the temperature for 1.9h, and then cool the quenched part in air to room temperature; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 467 ℃, raising the temperature for 105min, preserving the heat for 3.6h, and then air-cooling to room temperature to obtain the final heat-treated piece.
Example 6
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.39%, B:1.59%, cr:4.81%, si:0.67%, mn:0.66%, W:1.18%, mo:0.65%, ti:0.09%, al:0.59%, V:2.56 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the piece to be quenched in the step S1 to 1015 ℃, preserving the heat for 124min, and performing room-temperature oil cooling to finish quenching treatment to obtain a quenched piece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 534 ℃ for 106min, and air-cool the quenched part to room temperature after heat preservation for 2.1 h; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 467 ℃, raising the temperature for 127min, keeping the temperature for 4.4h, and then air-cooling to room temperature to obtain the final heat-treated piece.
Example 7
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.40%, B:1.58%, cr:4.83%, si:0.62%, mn:0.73%, W:1.24%, mo:0.67%, ti:0.08%, al:0.63%, V:2.77 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the piece to be quenched in the step S1 to 1043 ℃, keeping the temperature for 130min, and performing room-temperature oil cooling to complete quenching treatment to obtain a quenched piece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 528 ℃ for 116min, preserve the temperature for 2.4h, and then cool the quenched part to room temperature in air; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 482 ℃, raising the temperature for 113min, keeping the temperature for 3.8h, and then air-cooling to room temperature to obtain the final heat-treated piece.
Example 8
A heat treatment method of vanadium-containing high-boron high-speed steel comprises the following steps:
s1, using vanadium-containing high-boron high-speed steel as a quenching to-be-processed piece, wherein the V-containing high-boron high-speed steel comprises the following components in percentage by weight: 0.40%, B:1.52%, cr:4.83%, si:0.64%, mn:0.77%, W:1.24%, mo:0.67%, ti:0.08%, al:0.63%, V:2.14 percent, and the balance of Fe and inevitable trace impurities;
s2, raising the temperature of the to-be-quenched workpiece to 1051 ℃, keeping the temperature for 135min, and performing room-temperature oil cooling to complete quenching treatment to obtain a quenched workpiece;
s3, tempering the quenched part in the step S2 twice, wherein the tempering process for one time is to raise the temperature from room temperature to 544 ℃, the temperature rise time is 125min, and air cooling is carried out to the room temperature after heat preservation is carried out for 2.2 h; and the secondary tempering process comprises the steps of raising the temperature from room temperature to 470 ℃, keeping the temperature for 4.4 hours, and then cooling in air to room temperature to obtain the final heat-treated piece.
Comparative example 1
The vanadium-containing high-boron high-speed steel which is not subjected to heat treatment comprises the following components in percentage by weight: 0.37%, B:1.44%, cr:4.77%, si:0.58%, mn:0.61%, W:1.16%, mo:0.63%, ti:0.07%, al:0.58%, V:1.00 percent, and the balance of Fe and inevitable trace impurities;
the vanadium-containing high-speed steel of example 1-3 and the vanadium-containing high-speed steel that was not heat-treated were subjected to hardness tests, the hardness test values of which are shown in table 1 below.
TABLE 1 hardness test of high-boron high-speed steel containing vanadium
In conclusion, the heat-treated vanadium-containing high-boron high-speed steel and the heat treatment method thereof improve the form of boron carbide through the heat treatment process, promote the matrix strengthening, obtain various vanadium-containing high-boron high-speed steels with excellent performance, enable the hardness of the vanadium-containing high-boron high-speed steel to reach more than 63HRC, and improve the hardness by more than 10HRC compared with the vanadium-containing high-speed steel which is not heat-treated. The vanadium-containing high-boron high-speed steel subjected to heat treatment is applied to actual production, and is more suitable for severe working conditions, so that a new idea is provided for further application and development of the vanadium-containing high-boron high-speed steel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A heat treatment method of vanadium-containing high-boron high-speed steel is characterized in that the vanadium-containing high-boron high-speed steel is quenched at 1010 to 1060 ℃ to obtain a quenched part; performing twice tempering treatment on the quenching treatment piece, and air-cooling to room temperature to obtain the heat-treated vanadium-containing high-boron high-speed steel;
the vanadium-containing high-boron high-speed steel comprises the following components in percentage by weight:
c:0.44%, B:1.61%, cr:4.83%, si:0.68%, mn:0.80%, W:1.24%, mo:0.67%, ti:0.12%, al:0.63%, V:3.00 percent, and the balance of Fe and inevitable trace impurities;
the temperature of the first tempering treatment is increased from room temperature to 550 ℃, the temperature rising time is 130min, and the heat preservation time of the first tempering treatment is 2.5h;
the temperature of the second tempering treatment is increased from room temperature to 490 ℃, the temperature-rising time is 130min, and the heat-preservation time of the second tempering treatment is 4.5h;
the heat preservation time of the quenching treatment is 150min.
2. The method of claim 1, wherein the quenching process is performed by room temperature oil cooling.
3. High-speed vanadium-containing steel heat-treated according to the method of claim 1.
4. The heat-treated vanadium-containing high-boron high-speed steel according to claim 3, wherein the room-temperature hardness is 63.4 to 66.2HRC.
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