CN102534132A - Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel - Google Patents
Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel Download PDFInfo
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- CN102534132A CN102534132A CN201210051587XA CN201210051587A CN102534132A CN 102534132 A CN102534132 A CN 102534132A CN 201210051587X A CN201210051587X A CN 201210051587XA CN 201210051587 A CN201210051587 A CN 201210051587A CN 102534132 A CN102534132 A CN 102534132A
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Abstract
The invention relates to a quenching-partitioning thermal treatment method for the high strength and toughness of medium carbon silicon-manganese low alloy steel and aims at solving the problems that the traditional medium carbon silicon-manganese low alloy steel has poor plasticity, toughness, and stress and corrosiveness resistance although having high strength. The quenching-partitioning thermal treatment method comprises the following steps of: carrying out austenization treatment on the medium carbon silicon-manganese low alloy steel, and then carrying out isothermal quenching in the martensite transition temperature range of the medium carbon silicon-manganese low alloy steel; and two. carrying out isothermal partitioning thermal treatment on the medium carbon silicon-manganese low alloy steel treated in the step one in a partitioning temperature from amartensite start (Ms) to 500 DEG C, and then quenching the medium carbon silicon-manganese low alloy steel to reach the room temperature, i.e. finishing the quenching-partitioning thermal treatment on the medium carbon silicon-manganese low alloy steel. After the medium carbon silicon-manganese low alloy steel is treated by the method, for the medium carbon silicon-manganese low alloy steel, the tensile strength reaches 1650MPa-2115MPa, the yield strength reaches 1490MPa-1950MPa, the coefficient of elongation is 5%-10%, and the reduction of area is 20%-50%.
Description
Technical field
The present invention relates to a kind of high tough quenching-partition heat treating method of middle carbon silicomanganese low alloy steel.
Background technology
Middle carbon silicomanganese low alloy steel generally has the higher intensity and the good elasticity limit, is mainly used in the main spring of leaf spring, whisker, relief valve spring and heavily stressed work down etc.The carbon content of such steel alloy is generally 0.50～0.70%, and the prior heat treatment system is quenching+tempering.Obtain high-intensity martensitic stucture through quenching, and utilize tempering to eliminate thermal stresses and structural stress that the quenching back occurs, conventional organization is a tempering troostite.Though traditional heat treating regime can guarantee such alloy and have higher elastic limit; Can satisfy the service condition of common environment for use; But shortcomings such as plasticity, toughness is not good enough or obdurability coupling not enough, hydrogen embrittlement and Sensitivity of Stress Corrosion are big have but limited the performance of such steel alloy obdurability potentiality.The fast development of automobile lightweight especially in recent years and high performance, an urgent demand improves the stress of spring steel.Because square being directly proportional of the quality of pendulum spring and stress; Under the constant prerequisite of spring performance, along with the raising of stress, but spring loss of weight 40%～50%; Therefore; Develop New Technology of Heat Treatment simple and easy to do in a kind of industry, under the prerequisite that guarantees enough plasticity, the carbon silicomanganese is that the spring steel stress improves 20%～30% in making; On the other hand; Can guarantee under the HS prerequisite; Improve plasticity and toughness significantly, reduce hydrogen embrittlement susceptibility, improve stress corrosion resistance, the application of carbon silicon manganese steel on important structure part under the harsh and unforgiving environments such as oceanic climate in widening has broad application prospects and user demand.
Summary of the invention
Though the present invention will solve existing middle carbon silicomanganese low alloy steel to have HS, its plasticity and toughness are poor, the problem of anticorrosion stress-resistant property difference, and a kind of high tough quenching-partition heat treating method of middle carbon silicomanganese low alloy steel is provided.
The high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in of the present invention: one, middle carbon silicomanganese low alloy steel austenitizing is handled; In the martensite transformation temperature interval of middle carbon silicomanganese low alloy steel, carry out isothermal quenching then, soaking time is 60～120s; Two, middle carbon silicomanganese low alloy steel that will be after step 1 is handled is at martensite start temperature M
sIsothermal partition thermal treatment 30～1800s to 500 ℃ the partition temperature, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
Austenitizing temperature during middle carbon silicomanganese low alloy steel austenitizing in the step 1 of the present invention is handled is the A of middle carbon silicomanganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 600s～900s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.
Carbon content is in 0.25%～0.60% scope in the middle carbon silicomanganese low alloy steel described in the step 1.
Carbon silicomanganese low alloy steel comprises and is not limited in 60Si2MnA, 55Si2Mn, 55Si2MnB, 55SiMnMoV, 55SiMnVB etc. other contains the silicomanganese medium carbon low alloy steel in described in the step 1.
In of the present invention in the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel at first with middle carbon silicomanganese low alloy steel behind austenitizing, be quenched into martensite transformation temperature interval (M
s～M
f) a certain temperature (Quenching Temperature, be called for short QT) carry out slack quenching or isothermal quenching, obtain partial martensite and residual austenite, subsequently at M
sThe thermal treatment of isothermal partition is to change carbon distribution in quenched martensite and the residual austenite between～500 ℃; Acquisition is by the heterogeneous structure of low carbon martensite and residual austenite and transformation organizational composition thereof; Thereby make the middle carbon silicomanganese low alloy steel after handling present the good combination of HS and high-ductility; And improved stress corrosion resistance, reduce hydrogen embrittlement susceptibility, and can in a big way, adjust cooperating of HS and high-ductility.
After the high tough quenching of carbon silicomanganese low alloy steel in of the present invention-partition heat treating method is handled; The tensile strength of middle carbon silicomanganese low alloy steel reaches 1650MPa～2115MPa; Ys reaches 1490MPa～1950MPa; Unit elongation is 5%～10%, and reduction of area is 20%～50%, critical stress intensity factor of stress corrosion cracking K
ISCCReach 35～40MPam
1/2Obtain to meet the comprehensive mechanical property index request that the different superstrengths of actual service condition match with good plasticity and toughness, and significantly improved hydrogen embrittlement and Sensitivity of Stress Corrosion.
Description of drawings
Fig. 1 is the martensitic stucture photo that embodiment 12 obtains through 220 ℃ of isothermal quenching of step 1; Fig. 2 crosses the martensite and the austenite structure photo of isothermal quenching and isothermal partition thermal treatment acquisition for embodiment ten Five Classics, and RA is a residual austenite among the figure, and BM is a lath martensite, and LM is a twin crystal martensite.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, middle carbon silicomanganese low alloy steel austenitizing is handled; In the martensite transformation temperature interval of middle carbon silicomanganese low alloy steel, carry out isothermal quenching then, soaking time is 60～120s; Two, middle carbon silicomanganese low alloy steel that will be after step 1 is handled is at martensite start temperature M
sIsothermal partition thermal treatment 30～1800s to 500 ℃ the partition temperature, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
Interval (the M of the martensite transformation temperature of the middle carbon silicomanganese low alloy steel in the step 1
s～M
f) for a certain specific middle carbon silicomanganese low alloy steel M
sAnd M
fValue is a fixed.
After high tough quenching-partition heat treating method of the middle carbon silicomanganese low alloy steel of this embodiment is handled; The tensile strength of middle carbon silicomanganese low alloy steel reaches 1650MPa～2115MPa; Ys reaches 1490MPa～1950MPa; Unit elongation is 5%～10%, and reduction of area is 20%～50%, critical stress intensity factor of stress corrosion cracking K
ISCCReach 35～40MPam
1/2Obtain to meet the comprehensive mechanical property index request that the different superstrengths of actual service condition match with good plasticity and toughness, and significantly improved hydrogen embrittlement and Sensitivity of Stress Corrosion.
Embodiment two: what this embodiment and embodiment one were different is: the austenitizing temperature during the middle carbon silicomanganese low alloy steel austenitizing in the step 1 is handled is the A of middle carbon silicomanganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 600s～900s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.Other is identical with embodiment one.
Embodiment three: what this embodiment was different with embodiment one or two is: carbon content is in 0.25%～0.60% scope in the middle carbon silicomanganese low alloy steel described in the step 1.Other is identical with embodiment one or two.
Embodiment four: what this embodiment was different with one of embodiment one to three is: carbon silicomanganese low alloy steel comprises and is not limited in 60Si2MnA, 55Si2Mn, 55Si2MnB, 55SiMnMoV, 55SiMnVB etc. other contains the silicomanganese medium carbon low alloy steel in described in the step 1.Other is identical with one of embodiment one to three.
Embodiment five: what this embodiment was different with one of embodiment one to four is: soaking time is 80～100s in the step 1.Other is identical with one of embodiment one to four.
Embodiment six: what this embodiment was different with one of embodiment one to four is: soaking time is 90s in the step 1.Other is identical with one of embodiment one to four.
Embodiment seven: what this embodiment was different with one of embodiment one to six is: isothermal partition thermal treatment 100～1600s in the step 2.Other is identical with one of embodiment one to six.
Embodiment eight: what this embodiment was different with one of embodiment one to six is: isothermal partition thermal treatment 300～1400s in the step 2.Other is identical with one of embodiment one to six.
Embodiment nine: what this embodiment was different with one of embodiment one to six is: isothermal partition thermal treatment 600～1200s in the step 2.Other is identical with one of embodiment one to six.
Embodiment ten: what this embodiment was different with one of embodiment one to six is: isothermal partition thermal treatment 800～1000s in the step 2.Other is identical with one of embodiment one to six.
Embodiment 11: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, 60Si2Mn steel austenitizing is handled; Austenitizing temperature is 870 ℃; Insulation 600s; In the martensite transformation temperature interval of 60Si2Mn steel, carry out isothermal quenching then, quenching temperature is 140 ℃, and soaking time is 120s; Two, 60Si2Mn steel isothermal partition thermal treatment 1200s under 370 ℃ partition temperature that will be after step 1 is handled, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
This embodiment 60Si2Mn steel is handled through this process heat and is being kept suitable plasticity prerequisite to be issued to superstrength index: tensile strength 2115MPa, ys 1490MPa, unit elongation 5%, reduction of area 20%.
Embodiment 12: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, 60Si2Mn steel austenitizing is handled; Austenitizing temperature is 870 ℃; Insulation 600s; In the martensite transformation temperature interval of 60Si2Mn steel, carry out isothermal quenching then, quenching temperature is 220 ℃, and soaking time is 60s; Two, 60Si2Mn steel isothermal partition thermal treatment 300s under 430 ℃ partition temperature that will be after step 1 is handled, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
This embodiment is as shown in Figure 1 through the martensitic stucture photo that 220 ℃ of isothermal quenching of step 1 obtain.
This embodiment 60Si2Mn steel is handled through this process heat and is being kept significantly improving plasticity index: tensile strength 1650MPa, ys 1540MPa, unit elongation 10%, reduction of area 50% under the superstrength level.
Embodiment 13: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, 60Si2Mn steel austenitizing is handled; Austenitizing temperature is 870 ℃; Insulation 600s; In the martensite transformation temperature interval of 60Si2Mn steel, carry out isothermal quenching then, quenching temperature is 180 ℃, and soaking time is 60s; Two, 60Si2Mn steel isothermal partition thermal treatment 600s under 410 ℃ partition temperature that will be after step 1 is handled, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
This embodiment 60Si2Mn steel is handled the comprehensive mechanical property index that reaches high strength and ductility, excellent strength-toughness cooperation through this process heat: tensile strength 2025MPa, ys 1950MPa, unit elongation 10%, reduction of area 40%.
Embodiment 14: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, 60Si2Mn steel austenitizing is handled; Austenitizing temperature is 870 ℃; Insulation 600s; In the martensite transformation temperature interval of 60Si2Mn steel, carry out isothermal quenching then, quenching temperature is 220 ℃, and soaking time is 60s; Two, 60Si2Mn steel isothermal partition thermal treatment 1200s under 390 ℃ partition temperature that will be after step 1 is handled, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
This embodiment 60Si2Mn steel critical stress intensity factor of stress corrosion cracking K
ISCCReach 35MPam
1/2, improve 20% than the prior heat treatment process of+480 ℃ of tempering 1800s that quench.Its mechanical performance index is: tensile strength 1938MPa, ys 1899MPa, elongation 10%, reduction of area 18%.
Embodiment 15: the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in this embodiment: one, 60Si2Mn steel austenitizing is handled; Austenitizing temperature is 870 ℃; Insulation 600s; In the martensite transformation temperature interval of 60Si2Mn steel, carry out isothermal quenching then, quenching temperature is 180 ℃, and soaking time is 60s; Two, 60Si2Mn steel isothermal partition thermal treatment 300s under 390 ℃ partition temperature that will be after step 1 is handled, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
This embodiment is as shown in Figure 2 through the martensite and the austenite structure photo of isothermal quenching and isothermal partition thermal treatment acquisition, and RA is a residual austenite among the figure, and BM is a lath martensite, and LM is a twin crystal martensite.
This embodiment 60Si2Mn steel critical stress intensity factor of stress corrosion cracking K
ISCCReach 40MPam
1/2, improve 35% than the prior heat treatment process of+480 ℃ of tempering 1800s that quench.Its mechanical performance index is: tensile strength 2025MPa, ys 1947MPa, elongation 9%, reduction of area 42%.
Claims (10)
1. the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in a kind; The high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel is realized through following steps in it is characterized in that: one, middle carbon silicomanganese low alloy steel austenitizing is handled; In the martensite transformation temperature interval of middle carbon silicomanganese low alloy steel, carry out isothermal quenching then, soaking time is 60～120s; Two, middle carbon silicomanganese low alloy steel that will be after step 1 is handled is at martensite start temperature M
sIsothermal partition thermal treatment 30～1800s to 500 ℃ the partition temperature, and then be quenched to room temperature, the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel in promptly accomplishing.
2. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 1 is characterized in that the austenitizing temperature in the middle carbon silicomanganese low alloy steel austenitizing processing in the step 1 is the A of middle carbon silicomanganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 600s～900s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.
3. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 1 and 2 is characterized in that carbon content is in 0.25%～0.60% scope in the middle carbon silicomanganese low alloy steel described in the step 1.
4. according to claim 3 a kind of in the high tough quenching-partition heat treating method of carbon silicomanganese low alloy steel, it is characterized in that described in the step 1 in carbon silicomanganese low alloy steel comprise and be not limited in 60Si2MnA, 55Si2Mn, 55Si2MnB, 55SiMnMoV, 55SiMnVB etc. other contains the silicomanganese medium carbon low alloy steel.
5. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 4 is characterized in that soaking time is 80～100s in the step 1.
6. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 4 is characterized in that soaking time is 90s in the step 1.
7. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 5 is characterized in that isothermal partition thermal treatment 100～1600s in the step 2.
8. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 5 is characterized in that isothermal partition thermal treatment 300～1400s in the step 2.
9. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 5 is characterized in that isothermal partition thermal treatment 600～1200s in the step 2.
10. the high tough quenching-partition heat treating method of a kind of middle carbon silicomanganese low alloy steel according to claim 5 is characterized in that isothermal partition thermal treatment 800～1000s in the step 2.
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| CN103243204A (en) * | 2013-05-13 | 2013-08-14 | 哈尔滨工业大学 | Strengthening and toughening heat treatment method of medium carbon manganese-vanadium low alloy steel |
| CN103276164A (en) * | 2013-05-15 | 2013-09-04 | 哈尔滨工业大学 | High-strength and high-toughness heat treatment method of medium-carbon silicon-manganese-chromium-nickel series low alloy steel |
| CN103343191A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Two-step isothermal heat treatment method for strengthening and toughening medium carbon-manganese-vanadium low alloy steel |
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| CN108950150A (en) * | 2018-08-31 | 2018-12-07 | 东北大学 | Manganese Q&P steel heat treatment process in superhigh intensity cold rolling based on complete austenitizing |
| CN111676362A (en) * | 2020-06-27 | 2020-09-18 | 扬州大学 | Novel quenching-partitioning-isothermal quenching heat treatment method capable of obtaining Si-series ultrahigh-strength disc spring |
| CN112575256A (en) * | 2020-11-26 | 2021-03-30 | 博耀能源科技有限公司 | High-strength and high-toughness large-diameter wind power bolt with shell/horse complex phase structure and preparation method thereof |
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| CN108950150A (en) * | 2018-08-31 | 2018-12-07 | 东北大学 | Manganese Q&P steel heat treatment process in superhigh intensity cold rolling based on complete austenitizing |
| CN111676362A (en) * | 2020-06-27 | 2020-09-18 | 扬州大学 | Novel quenching-partitioning-isothermal quenching heat treatment method capable of obtaining Si-series ultrahigh-strength disc spring |
| CN111676362B (en) * | 2020-06-27 | 2021-10-12 | 扬州大学 | Novel quenching-partitioning-isothermal quenching heat treatment method capable of obtaining Si-series ultrahigh-strength disc spring |
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Application publication date: 20120704 |