CN109706302B - A kind of hot-working method improving medium carbon steel mechanical property - Google Patents
A kind of hot-working method improving medium carbon steel mechanical property Download PDFInfo
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- CN109706302B CN109706302B CN201910171504.2A CN201910171504A CN109706302B CN 109706302 B CN109706302 B CN 109706302B CN 201910171504 A CN201910171504 A CN 201910171504A CN 109706302 B CN109706302 B CN 109706302B
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Abstract
The present invention provides a kind of hot-working methods for improving medium carbon steel mechanical property, are related to metal material science and technology field.It include: that medium carbon steel is successively carried out to high temperature and pressure heat treatment and cryogenic high pressure heat treatment.Medium carbon steel is heat-treated through high temperature and pressure, obtains the higher tiny martensite tissue containing dislocation density, these dislocations provide more multiposition in subsequent cryogenic high pressure heat treatment process for the precipitation of carbide, increase the amounts of particles of carbide precipitate；Cryogenic high pressure heat treatment reduces the diffusion coefficient of atom under elevated pressures effect, so that the carbide particle quantity being precipitated is more and is not easy to grow up, to cause the carbide particle more small and dispersed being precipitated, so as to cause dispersion-strengthened effect enhancing, the hardness and strength of medium carbon steel are improved.Compared with the heat treatment of same process normal pressure, 10.00~12.12% and 10.77~14.33% have been respectively increased in the hardness number and compression yield strength of the medium carbon steel handled through hot-working method of the present invention.
Description
Technical field
The present invention relates to metal material science and technology field more particularly to a kind of hot-working for improving medium carbon steel mechanical property
Method.
Background technique
Medium carbon steel is at low cost, and heat processing technique is good, conditioned processing (quenching+high tempering) afterwards have good intensity,
The advantages that toughness and plasticity, can be used to make axis class and gear part in terms of widely answered
With.However medium carbon steel shortcoming is that harden ability is poor, and the granular carbide being distributed on ferrite matrix after conditioned processing
Dispersion-strengthened effect it is insufficient, thus lead to the low strength of medium carbon steel, the operating condition that can not meet under some high-strength workings is wanted
It asks, to make medium carbon steel play maximum service performance, exploring the new process for improving medium carbon steel mechanical property has centainly
Practical significance.
Currently, it (includes: deformation, heat treatment that alloying element and hot-working, which is mainly added, in the method generallyd use in steel
Deng), though being worked well using addition alloying element method, there are process system controls strictly, it is at high cost, easily there are tissue odds
Phenomenon.And the mechanical property for using hot-working method to improve medium carbon steel is limited.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of hot-working method for improving medium carbon steel mechanical property, this hair
The hot-working method of bright offer can increase substantially the mechanical property of medium carbon steel.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of hot-working methods for improving medium carbon steel mechanical property, comprising the following steps:
(1) by medium carbon steel under conditions of six faces are pressurizeed, high temperature and pressure heat treatment is carried out, obtains pretreatment medium carbon steel；
(2) by the pretreatment medium carbon steel under conditions of six faces are pressurizeed, cryogenic high pressure heat treatment is carried out；
The temperature of the high temperature and pressure heat treatment is 860~900 DEG C；The temperature of cryogenic high pressure heat treatment is 500~
600℃。
Preferably, the pressure of the high temperature and pressure heat treatment and cryogenic high pressure heat treatment is 2~6GPa.
Preferably, the time of the high temperature and pressure heat treatment is 10~15min.
Preferably, the time of the cryogenic high pressure heat treatment is 30~60min.
Preferably, after high temperature and pressure heat treatment, by gained high temperature high fever heat-treated products pressure maintaining condition
Under, cool to room temperature with the furnace.
Preferably, after cryogenic high pressure heat treatment, by gained low temperature high-temperature heat treatment product pressure maintaining condition
Under, cool to room temperature with the furnace.
Preferably, the rate for being warming up to the high temperature and pressure heat treatment temperature and cryogenic high pressure heat treatment temperature independently is
40~50 DEG C/min.
Preferably, the medium carbon steel includes the element of following mass percentage: C 0.30~0.50%, Mn 0.40~
0.80%, Si 0.020~0.40%, P≤0.030%, S≤0.035%, the Fe of surplus.
The present invention provides a kind of hot-working methods for improving medium carbon steel mechanical property, comprising the following steps: by medium carbon steel
Under conditions of six faces are pressurizeed, high temperature and pressure heat treatment is carried out, obtains pretreatment medium carbon steel；By the pretreatment medium carbon steel six
Under conditions of the pressurization of face, cryogenic high pressure heat treatment is carried out；The temperature of the high temperature and pressure heat treatment is 860~900 DEG C；It is described low
The temperature of warm high voltage driving IC is 500~600 DEG C.Medium carbon steel of the invention is heat-treated through high temperature and pressure, is obtained and is contained dislocation density
Higher tiny martensite tissue, these dislocations provide more in subsequent cryogenic high pressure heat treatment process for the precipitation of carbide
Multiposition increases the amounts of particles of carbide precipitate；Cryogenic high pressure heat treatment makees the diffusion coefficient of atom in higher pressure
With lower reduction, so that the carbide particle quantity being precipitated is more and is not easy to grow up, to cause the carbide particle more refinement being precipitated
Small disperse improves the hardness and strength of medium carbon steel so as to cause dispersion-strengthened effect enhancing.In addition, hot-working of the invention
Method and process is simple, easy to operate, and it is uniform and stable to obtain medium carbon steel performance.Embodiment statistics indicate that: do not changing medium carbon steel
On the basis of primitive component, hot-working method of the invention can effectively improve the mechanical property of medium carbon steel；With same process normal pressure
Heat treatment is compared, and the hardness number and compression yield strength of the medium carbon steel handled through hot-working method of the present invention are respectively increased
10.00~12.12% and 10.77~14.33%.
Specific embodiment
The present invention provides a kind of hot-working methods for improving medium carbon steel mechanical property, comprising the following steps:
(1) by medium carbon steel under conditions of six faces are pressurizeed, high temperature and pressure heat treatment is carried out, obtains pretreatment medium carbon steel；
(2) by the pretreatment medium carbon steel under conditions of six faces are pressurizeed, cryogenic high pressure heat treatment is carried out；
The temperature of the high temperature and pressure heat treatment is 860~900 DEG C；The temperature of cryogenic high pressure heat treatment is 500~
600℃。
Medium carbon steel under conditions of six faces are pressurizeed, is carried out high temperature and pressure heat treatment by the present invention, obtains pretreatment medium carbon steel.
In the present invention, the medium carbon steel preferably includes the element of following mass percentage: C 0.30~0.50%, Mn 0.40~
0.80%, Si 0.020~0.40%, P≤0.030%, S≤0.035%, the Fe of surplus.The present invention carrys out the medium carbon steel
Source is not specifically limited, using commercial product well known to those skilled in the art or self-control medium carbon steel.The present invention is to described
The preparation method of medium carbon steel is not specifically limited, using medium carbon steel preparation method well known to those skilled in the art, specifically
Such as normalizing state medium carbon steel.
In the present invention, the temperature of the high temperature and pressure heat treatment is 860~900 DEG C, preferably 870~890 DEG C；It is described
The pressure of high temperature and pressure heat treatment is preferably 2~6GPa, further preferably 3~5GPa；High temperature and pressure heat treatment when
Between preferably 10~15min.In the present invention, the rate for being warming up to the high temperature and pressure heat treatment temperature is preferably 40~50
℃/min.In the present invention, the condition of the six faces pressurization is realized by cubic hinge press；The i.e. described high temperature and pressure heat treatment exists
It is completed in cubic hinge press.
High temperature and pressure heat treatment after the completion of, the present invention preferably by gained high temperature and pressure heat-treated products pressure maintaining condition
Under, cool to room temperature with the furnace.In the present invention, when being related to equipment operation, specific steps are preferred are as follows: high temperature and pressure heat treatment knot
Shu Hou, turns off the power supply of the cubic hinge press, and pressure maintaining cools to room temperature with the furnace.
Medium carbon steel of the invention obtains the higher tiny martensite tissue containing dislocation density after high temperature and pressure is heat-treated,
Precipitation of these dislocations in subsequent cryogenic high pressure heat treatment process for carbide provides more multiposition, increases carbide precipitate
Amounts of particles.
After obtaining pretreatment medium carbon steel, the present invention under conditions of six faces are pressurizeed, carries out the pretreatment medium carbon steel low
Warm high voltage driving IC.In the present invention, the temperature of cryogenic high pressure heat treatment is 500~600 DEG C, preferably 520~580
DEG C, further preferably 540~560 DEG C.In the present invention, the pressure of the cryogenic high pressure heat treatment is preferably hot with high temperature and pressure
The temperature of processing is consistent, preferably 2~6GPa, further preferably 3~5GPa.In the present invention, at the cryogenic high pressure heat
The time of reason is preferably 30~60min.In the present invention, the rate for being warming up to the cryogenic high pressure heat treatment temperature is preferably 40
~50 DEG C/min.In the present invention, the condition of the six faces pressurization is realized by cubic hinge press；At the i.e. described cryogenic high pressure heat
Reason is completed in cubic hinge press.
Cryogenic high pressure heat treatment after the completion of, the present invention preferably by gained cryogenic high pressure heat-treated products pressure maintaining condition
Under, cool to room temperature with the furnace.In the present invention, when being related to equipment operation, be preferably a step: cryogenic high pressure heat treatment terminates
Afterwards, turn off the power supply of the cubic hinge press, pressure maintaining cools to room temperature with the furnace.
Cryogenic high pressure heat treatment reduces the diffusion coefficient of atom under the effect of higher pressure, so that the carbide being precipitated
Amounts of particles is more and is not easy to grow up, so that the carbide particle more small and dispersed being precipitated is caused, so as to cause dispersion-strengtherning effect
Fruit enhancing, improves the hardness and strength of medium carbon steel.
Medium carbon steel is successively heat-treated through high temperature and pressure heat treatment and cryogenic high pressure by the present invention, and not changing, medium carbon steel is original
On the basis of ingredient, the mechanical property of medium carbon steel can be effectively improved.Moreover, hot-working method simple process of the invention, operation
Convenient, processing medium carbon steel performance is uniform and stable.
The hot-working method provided by the invention for improving medium carbon steel mechanical property is carried out below with reference to embodiment detailed
Illustrate, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Experimental material is 35 medium carbon steel, and the medium carbon steel includes the element of following heavy mass percentage: C 0.36%, Mn
0.56%, Si 0.32%, P 0.027%, S 0.025%, the iron of surplus.
Medium carbon steel sample having a size of 8 × 10mm of Φ is carried out at high temperature and pressure heat on CS- Ι Ι Type B cubic hinge press
Reason, pressure 6GPa, temperature are 900 DEG C, soaking time 10min；Then power-off pressure maintaining cools to room temperature with the furnace, obtains pre- place
Manage medium carbon steel；
By the pretreatment medium carbon steel under the pressure of 6GPa, 500 DEG C are warming up to the rate of 50 DEG C/min, heat preservation
After 30min, power-off pressure maintaining cools to room temperature with the furnace.
The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Embodiment 2
Experimental material is 45 medium carbon steel, and the medium carbon steel includes the element of following heavy mass percentage: C 0.46%, Mn
0.51%, Si 0.28%, P 0.031%, S 0.028%, the iron of surplus.
Specimen size and experimental facilities are same as Example 1, and the pressure of high temperature and pressure heat treatment is 2GPa, temperature 860
DEG C, then soaking time 15min powers off pressure maintaining and cools to room temperature with the furnace, obtains pretreatment medium carbon steel；
By the pretreatment medium carbon steel under the pressure of 2GPa, 600 DEG C are warming up to the rate of 50 DEG C/min, heat preservation
After 60min, power-off pressure maintaining cools to room temperature with the furnace.
The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Embodiment 3
Experimental material, specimen size and experimental facilities are same as Example 2, and the pressure of high temperature and pressure heat treatment is 4GPa,
Temperature is 900 DEG C, soaking time 10min, then powers off pressure maintaining and cools to room temperature with the furnace, obtains pretreatment medium carbon steel；
By the medium carbon steel under the pressure of 4GPa, 500 DEG C are warming up to the rate of 50 DEG C/min, after keeping the temperature 40min, is broken
Electric pressure maintaining cools to room temperature with the furnace.
The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Embodiment 4
Same as Example 1, difference is only that, the pressure of the high temperature and pressure heat treatment and low temperature high-temperature heat treatment is
2GPa.The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Embodiment 5
Same as Example 1, difference is only that, the temperature of the high temperature and pressure heat treatment is 860 DEG C.
The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Embodiment 6
Same as Example 1, difference is only that, the temperature of the cryogenic high pressure heat treatment is 600 DEG C.
The mechanical property for the medium carbon steel being heat-treated through high temperature and pressure heat treatment and cryogenic high pressure is as shown in table 1.
Comparative example 1
Sample and specimen size are same as Example 1；The medium carbon steel is put into KL-12D chamber type electric resistance furnace and is heated to
After 900 DEG C of heat preservation 10min, investment quenching-in water is taken out rapidly, after qtenched sample is then heated to 500 DEG C of heat preservation 30min again,
It is air-cooled to room temperature；The performance of medium carbon steel after heat treatment is as shown in table 1.
Comparative example 2
Sample and specimen size are same as Example 2；The medium carbon steel is put into KL-12D chamber type electric resistance furnace and is heated to
After 860 DEG C of heat preservation 15min, investment quenching-in water is taken out rapidly, after qtenched sample is then heated to 600 DEG C of heat preservation 60min again,
It is air-cooled to room temperature；The performance of medium carbon steel after heat treatment is as shown in table 1.
Comparative example 3
Sample and specimen size are same as Example 2；The medium carbon steel is put into KL-12D chamber type electric resistance furnace and is heated to
After 900 DEG C of heat preservation 10min, investment quenching-in water is taken out rapidly, after qtenched sample is then heated to 500 DEG C of heat preservation 40min again,
It is air-cooled to room temperature；The performance of medium carbon steel after heat treatment is as shown in table 1.
1 Examples 1 to 6 of table and the processed medium carbon steel mechanical experimental results of comparative example 1~3
As can be seen from Table 1: compared with the heat treatment of same process normal pressure, medium carbon steel is after hot-working method of the present invention processing
10.00~12.12% and 10.77~14.33% have been respectively increased in hardness and compression yield strength, this illustrates the method for the present invention energy
Effectively improve the mechanical property of medium carbon steel.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of hot-working method for improving medium carbon steel mechanical property, which comprises the following steps:
(1) by medium carbon steel under conditions of six faces are pressurizeed, high temperature and pressure heat treatment is carried out, obtains pretreatment medium carbon steel；
(2) by the pretreatment medium carbon steel under conditions of six faces are pressurizeed, cryogenic high pressure heat treatment is carried out；
The medium carbon steel includes the element of following mass percentage: C 0.30~0.50%, Mn 0.40~0.80%, Si
0.020~0.40%, P≤0.030%, S≤0.035%, the Fe of surplus；
The temperature of the high temperature and pressure heat treatment is 860~900 DEG C；The temperature of the cryogenic high pressure heat treatment is 500~600
℃；
The pressure of the high temperature and pressure heat treatment and cryogenic high pressure heat treatment is 2~6GPa.
2. hot-working method according to claim 1, which is characterized in that the time of high temperature and pressure heat treatment is 10~
15min。
3. hot-working method according to claim 1, which is characterized in that the time of cryogenic high pressure heat treatment is 30~
60min。
4. hot-working method according to claim 1, which is characterized in that after the high temperature and pressure heat treatment, by institute
High temperature high fever heat-treated products are obtained under conditions of pressure maintaining, cool to room temperature with the furnace.
5. hot-working method according to claim 1, which is characterized in that after the cryogenic high pressure heat treatment, by institute
Low temperature high-temperature heat treatment product is obtained under conditions of pressure maintaining, cools to room temperature with the furnace.
6. hot-working method according to claim 1, which is characterized in that be warming up to the high temperature and pressure heat treatment temperature and
The rate of cryogenic high pressure heat treatment temperature independently is 40~50 DEG C/min.
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Effective date of registration: 20201209 Address after: Door 1, floor 1-4, building 51-3, Dongfeng Road, Xihu District, Benxi City, Liaoning Province Patentee after: Benxi Juying New Material Technology Co.,Ltd. Address before: 066000 No. 438, Hebei Avenue, Qinhuangdao, Hebei Patentee before: Yanshan University |
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