CN102560023A - Thermal treatment method for low-carbon chrome-silicon manganese low alloy steel - Google Patents
Thermal treatment method for low-carbon chrome-silicon manganese low alloy steel Download PDFInfo
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Abstract
The invention relates to a thermal treatment method for low-carbon chrome-silicon manganese low alloy steel and especially relates to a high-strength quenching-parting thermal treatment method for the low-carbon chrome-silicon manganese low alloy steel, aiming at solving the problem that the low-carbon chrome-silicon manganese low alloy steel treated and obtained according to the traditional thermal treatment technology cannot meet the demand on high strength as well as excellent toughness and ductility. The thermal treatment method comprises the following steps of: austenitizing the low-carbon chrome-silicon manganese low alloy steel; performing isothermal quenching or incomplete quenching on the low-carbon chrome-silicon manganese low alloy steel at Ms point below 170-10 DEG C; keeping temperature for 6s-5400s; and quenching to room temperature, thereby finishing the treatment. The low-carbon chrome-silicon manganese low alloy steel treated according to the high-strength quenching-parting thermal treatment method for the low-carbon chrome-silicon manganese low alloy steel provided by the invention has a tensile strength reaching 1665MPa-2085MPa and a ductility of 9%-15%; the high strength of the series of steel is ensured while a certain ductility is achieved; and the comprehensive mechanical performance is obviously higher than that of the steel treated by the traditional thermal treatment technology.
Description
Technical field
The present invention relates to the high tough quenching-partition heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
Background technology
Low-carbon (LC) chrome-silicon manganese low alloy steel is mainly used in crucial load-carrying members such as space shuttle axle, beam and gear etc. and space rocket, nuclear industry, is commercial the earliest one type of low-alloy super-strength steel.Low-alloy super-strength steel is on the basis of modified structure iron, to grow up, and through adding a spot of alloying element, reaches solution strengthening and improves the hardening capacity of steel and the purpose of martenaging martempering stability.The alloying element total content of this type steel generally is not higher than 5%, and carbon content is between 0.25-0.50%, and thermal treatment process is carried out temper after being generally quenching again.But traditional thermal treatment process can not be taken into account HS and the well requirement of plasticity and toughness: keep about its tensile strength 1500-1600MPa then plasticity lower (unit elongation is only about 3%-6%), the very high easy generation low stress brittle fracture of crack sensitivity if reduce tempering temperature; Can improve plasticity (unit elongation＞10%) if improve tempering temperature, but intensity declines to a great extent to 1000-1100MPa.For this reason; Need the simple and easy to do slack quenching-isothermal partition New Technology of Heat Treatment of exploitation; Under the prerequisite that guarantees suitable plasticity, significantly improve the tensile strength of this Series Steel, perhaps significantly improve plasticity and toughness, thereby the difference that realizes HS, high-plasticity cooperates in the high-intensity while of assurance; Improve the hydrogen embrittlement susceptibility and the stress corrosion resistance of this Series Steel simultaneously, the performance requirement of the HS important component that severe environment such as adaptation oceanic climate are growing.
Summary of the invention
The present invention will solve existing traditional thermal treatment process to handle the problem that low-carbon (LC) chrome-silicon manganese low alloy steel can not be taken into account the requirement of HS and good plasticity and toughness that obtains; The heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel is provided; Processing is possessed the good strength and the low-carbon (LC) chrome-silicon manganese low alloy steel of plasticity preferably simultaneously, reaches better comprehensive mechanical property.
The heat treating method of first kind of low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention is realized through following steps: after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s is quenched to room temperature again, promptly accomplishes the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
The heat treating method of second kind of low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention is realized through following steps: one, with after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s; Two, low-carbon (LC) chrome-silicon manganese low alloy steel that will be after step 1 is handled is at M
s+ 100 ℃ to M
sIn-100 ℃ the temperature range, isothermal partition thermal treatment 6s～5400s, and then be quenched to room temperature, promptly accomplish the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
Low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention comprises but is not limited in 30CrMnSi, 30CrMnSiNi2,30CrMnSiNi2A steel and other low-carbon (LC)s SiMn steel.
Austenitizing temperature in the low-carbon (LC) chrome-silicon manganese low alloy steel austenite of the present invention processing is the A of low-carbon (LC) chrome-silicon manganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 10s～1800s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.
The martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention
s, to the martensite start temperature M of a certain specific low-carbon (LC) chrome-silicon manganese low alloy steel
s, be fixed value, and those skilled in the art very simply just can obtain the martensite start temperature M of certain low-carbon (LC) chrome-silicon manganese low alloy steel according to common practise
s
The present invention is directed to quenching-partition (Quenching and Partitioning that commercialization low-carbon (LC) chromium manganese silicon series low-alloy steel proposes; Abbreviation Q&P) technology is different with traditional Q-tempering technology; Quenching of the present invention-partition thermal treatment process with low-carbon (LC) chromium manganese silicon low-alloy steel austenitizing after; Elder generation in the martensite transformation temperature interval of low-carbon (LC) chrome-silicon manganese low alloy steel, carries out isothermal quenching or slack quenching obtains partial martensite and do not change austenite, then at (M
s+ 100 ℃, M
s-100 ℃) temperature range in insulation, the before formation martensite of carbon spread in not changing austenite and make it stabilization, be quenched into room temperature at last, obtain the heterogeneous structure of forming by low carbon martensite and rich carbon austenitic.With respect to traditional Q-tempering technology, quenching of the present invention-partition thermal treatment process can make martensitic steel under the prerequisite that keeps strength level, obviously improve plasticity and toughness.
The tensile strength of the low-carbon (LC) chrome-silicon manganese low alloy steel after the high tough quenching-partition heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel of the present invention is handled reaches 1665MPa～2085MPa, and plasticity is 9%～15%.Guaranteeing that this steel series keeps high-intensity certain plasticity that has concurrently simultaneously; And comprehensive mechanical property significantly improves than prior heat treatment process (Q-tempering technology); Different according to this steel series simultaneously carbon content and target capabilities design and first kind of heat treating method optimizing or second kind of heat treating method; Obtain the cooperation of different HS, high-plasticity and good stress corrosion resistance, satisfy different performance requirements.
Description of drawings
Fig. 1 is the process schematic representation of the heat treating method of embodiment four; Fig. 2 is the transmission electron microscope bright field image picture of the 30CrMnSi steel after handling in the embodiment four; Fig. 3 is the transmission electron microscope dark field image picture of the 30CrMnSi steel after handling in the embodiment four; Fig. 4 is the diffraction spot point diagram of the 30CrMnSi steel after handling in the embodiment four; Fig. 5 is the process schematic representation of the heat treating method of embodiment nine.
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 heat treating method of first kind of low-carbon (LC) chrome-silicon of this embodiment manganese low alloy steel is realized through following steps: after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s is quenched to room temperature again, promptly accomplishes the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
The martensite start temperature M of the low-carbon (LC) chrome-silicon manganese low alloy steel of this embodiment
s, to the martensite start temperature M of a certain specific low-carbon (LC) chrome-silicon manganese low alloy steel
s, be fixed value, and those skilled in the art very simply just can obtain the martensite start temperature M of certain low-carbon (LC) chrome-silicon manganese low alloy steel according to common practise
s
This embodiment is applicable to the Heat Treatment Of Steel of 30CrMnSi series low-carbon (LC) chromium manganese silicon series low-alloy superstrength.The steel grades that uses is following:
The thermal treatment process of this embodiment is applicable to the Heat Treatment Of Steel of 30CrMnSi series low-carbon (LC) chromium manganese silicon series low-alloy superstrength.Wherein every steel grade that satisfies composition listed in the below table 1 all is applicable to the thermal treatment process of this embodiment:
Heat treating method is suitable for the composition (Wt.%) of steel grade in table 1 embodiment one
Embodiment two: what this embodiment and embodiment one were different is: described low-carbon (LC) chrome-silicon manganese low alloy steel is 30CrMnSi steel, 30CrMnSiNi2 steel or 30CrMnSiNi2A steel.Other is identical with embodiment one.
Low-carbon (LC) chrome-silicon manganese low alloy steel described in this embodiment comprises but is not limited in 30CrMnSi steel, 30CrMnSiNi2 steel and 30CrMnSiNi2A steel, also comprises other low-carbon (LC)s SiMn steel.
Embodiment three: what this embodiment and embodiment one were different is: the austenitizing temperature in the processing of said low-carbon (LC) chrome-silicon manganese low alloy steel austenite is the A of low-carbon (LC) chrome-silicon manganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 10s～1800s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.Other is identical with embodiment one.
Embodiment four: this embodiment 30CrMnSi Heat Treatment Of Steel method realizes through following steps: with the 30CrMnSi steel after 810 ℃～890 ℃ down insulation 600s accomplish austenitizings and handle; Under 170～320 ℃ temperature, carry out isothermal quenching or slack quenching then; Insulation 30s～600s; Be quenched to room temperature again, promptly accomplish 30CrMnSi Heat Treatment Of Steel method.
The process schematic representation of the heat treating method of this embodiment is as shown in Figure 1, and AT representes austenitizing temperature among the figure, and QT representes quenching temperature, and PT representes the partition temperature.
The tensile strength of the 30CrMnSi steel after the thermal treatment process of this embodiment is handled reaches 1740MPa～2085MPa, and plasticity reaches 10.5%～15%, and relative reduction in area reaches 21.5%～35%.In the intensity that guarantees the 30CrMnSi steel, obtained good plasticity, realized that the strong plasticity of 30CrMnSi steel cooperates.
The beneficial effect of the 30CrMnSi Heat Treatment Of Steel method through following this embodiment of verification experimental verification:
Test 1:30CrMnSi Heat Treatment Of Steel method realizes through following steps: with the 30CrMnSi steel after 850 ℃ insulation 600s accomplishes the austenitizing processing down; Under 250 ℃ temperature, carry out isothermal quenching then; Insulation 300s; Be quenched to room temperature again, promptly accomplish 30CrMnSi Heat Treatment Of Steel method.The tensile strength of the 30CrMnSi steel after the processing is 2085MPa, and plasticity reaches 10.5%, and relative reduction in area is 21.5%, obtains advantages of higher tensile strength and certain plasticity.Having well strong plasticity cooperates.
Test 2:30CrMnSi Heat Treatment Of Steel method realizes through following steps: with the 30CrMnSi steel after 850 ℃ insulation 600s accomplishes the austenitizing processing down; Under 220 ℃ temperature, carry out isothermal quenching then; Insulation 300s; Be quenched to room temperature again, promptly accomplish 30CrMnSi Heat Treatment Of Steel method.The tensile strength of the 30CrMnSi steel after the processing is 1740MPa, and plasticity reaches 15%, and relative reduction in area is 35%, obtains advantages of higher tensile strength and certain plasticity.Having well strong plasticity cooperates.
The transmission electron microscope bright field image picture that after this test is handled is the 30CrMnSi steel is as shown in Figure 2, can observe martensite lath and the residual austenite between lath; Transmission electron microscope dark field image picture is as shown in Figure 3; The diffraction spot point diagram is as shown in Figure 4.
Embodiment five: this embodiment 30CrMnSiNi2 steel or 30CrMnSiNi2A Heat Treatment Of Steel method realize through following steps: with 30CrMnSiNi2 steel or 30CrMnSiNi2A steel at A
C3More than after 30 ℃～50 ℃ down insulation 10s～3600s accomplish austenitizing and handle, then at martensitic transformation starting point M
sBelow carry out isothermal quenching or slack quenching under 170～10 ℃ the temperature, insulation 6s～5400s is quenched to room temperature again, promptly accomplishes 30CrMnSiNi2 steel or 30CrMnSiNi2A Heat Treatment Of Steel method.
Embodiment six: the heat treating method of second kind of low-carbon (LC) chrome-silicon of this embodiment manganese low alloy steel is realized through following steps: one, with after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s; Two, low-carbon (LC) chrome-silicon manganese low alloy steel that will be after step 1 is handled is at M
s+ 100 ℃ to M
sIn-100 ℃ the temperature range, isothermal partition thermal treatment 6s～5400s, and then be quenched to room temperature, promptly accomplish the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
The martensite start temperature M of the low-carbon (LC) chrome-silicon manganese low alloy steel of this embodiment
s, to the martensite start temperature M of a certain specific low-carbon (LC) chrome-silicon manganese low alloy steel
s, be fixed value, and those skilled in the art very simply just can obtain the martensite start temperature M of certain low-carbon (LC) chrome-silicon manganese low alloy steel according to common practise
s
Embodiment seven: what this embodiment and embodiment six were different is: described low-carbon (LC) chrome-silicon manganese low alloy steel is 30CrMnSi steel, 30CrMnSiNi2 steel or 30CrMnSiNi2A steel.Other and embodiment six phase are together.
Low-carbon (LC) chrome-silicon manganese low alloy steel described in this embodiment comprises but is not limited in 30CrMnSi steel, 30CrMnSiNi2 steel and 30CrMnSiNi2A steel, also comprises other low-carbon (LC)s SiMn steel.
Embodiment eight: what this embodiment and embodiment six were different is: the austenitizing temperature in the processing of said low-carbon (LC) chrome-silicon manganese low alloy steel austenite is the A of low-carbon (LC) chrome-silicon manganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 10s～1800s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.Other and embodiment six phase are together.
Embodiment nine: this embodiment 30CrMnSi Heat Treatment Of Steel method; It is realized through following steps: one, with the 30CrMnSi steel after 810 ℃～880 ℃ down insulation 600s accomplish austenitizings and handle; Under 170～250 ℃ temperature, carry out isothermal quenching or slack quenching then, insulation 60s～300s; Two, 30CrMnSi steel that will be after step 1 is handled is in 330 ℃～440 ℃ temperature range, and isothermal partition thermal treatment 120s～900s, and then be quenched to room temperature promptly accomplishes 30CrMnSi Heat Treatment Of Steel method.
The process schematic representation of the heat treating method of this embodiment is as shown in Figure 5, and AT representes austenitizing temperature among the figure, and QT representes quenching temperature, and PT representes the partition temperature.
The tensile strength of the 30CrMnSi steel after the thermal treatment process of this embodiment is handled reaches 1665MPa～1740MPa, and plasticity reaches 9%～13%.In the intensity that guarantees the 30CrMnSi steel, obtained good plasticity, realized that the strong plasticity of 30CrMnSi steel cooperates.
The beneficial effect of the 30CrMnSi Heat Treatment Of Steel method through following this embodiment of verification experimental verification:
Test 3:30CrMnSi Heat Treatment Of Steel method, it is realized through following steps: one, with the 30CrMnSi steel after 850 ℃ insulation 600s accomplishes austenitizing and handles down, under 220 ℃ temperature, carry out isothermal quenching then, be incubated 120s; Two, 30CrMnSi steel that will be after step 1 is handled is under 350 ℃ temperature, and isothermal partition thermal treatment 120s, and then be quenched to room temperature promptly accomplishes 30CrMnSi Heat Treatment Of Steel method.The tensile strength of the 30CrMnSi steel after the processing is 1740MPa, and plasticity reaches 9.0%, acquisition advantages of higher tensile strength and certain plasticity.Having well strong plasticity cooperates.
Test 4:30CrMnSi Heat Treatment Of Steel method, it is realized through following steps: one, with the 30CrMnSi steel after 850 ℃ insulation 600s accomplishes austenitizing and handles down, under 240 ℃ temperature, carry out isothermal quenching then, be incubated 120s; Two, 30CrMnSi steel that will be after step 1 is handled is under 410 ℃ temperature, and isothermal partition thermal treatment 600s, and then be quenched to room temperature promptly accomplishes 30CrMnSi Heat Treatment Of Steel method.The tensile strength of the 30CrMnSi steel after the processing is 1665MPa, and plasticity reaches 13%, and intensity reduces than the prior heat treatment optimum value slightly, but plasticity is better.Having well strong plasticity cooperates.
Test 5:30CrMnSi Heat Treatment Of Steel method, it is realized through following steps: one, with the 30CrMnSi steel after 850 ℃ insulation 600s accomplishes austenitizing and handles down, under 180 ℃ temperature, carry out isothermal quenching then, be incubated 120s; Two, 30CrMnSi steel that will be after step 1 is handled is under the temperature in 430 ℃ interval, and isothermal partition thermal treatment 900s, and then be quenched to room temperature promptly accomplishes 30CrMnSi Heat Treatment Of Steel method.The tensile strength of the 30CrMnSi steel after the processing is 1735MPa, and plasticity reaches 12.5%, and strength and ductility product is 21520MPa%.Obtain advantages of higher tensile strength and certain plasticity.Having well strong plasticity cooperates.
Embodiment ten: this embodiment 30CrMnSiNi2 steel or 30CrMnSiNi2A Heat Treatment Of Steel method, it is realized through following steps: one, with 30CrMnSiNi2 steel or 30CrMnSiNi2A steel at A
C3More than after 30 ℃～50 ℃ down insulation 10s～1800s accomplish austenitizing and handle, then at martensitic transformation starting point M
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s; Two, 30CrMnSiNi2 steel that will be after step 1 is handled or 30CrMnSiNi2A steel are at M
s+ 100 ℃ to M
sIn-100 ℃ the temperature range, isothermal partition thermal treatment 6s～5400s, and then be cooled to room temperature, promptly accomplish 30CrMnSiNi2 steel or 30CrMnSiNi2A Heat Treatment Of Steel method.
Claims (6)
1. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel; The heat treating method that it is characterized in that low-carbon (LC) chrome-silicon manganese low alloy steel is realized through following steps: after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s is quenched to room temperature again, promptly accomplishes the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
2. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel according to claim 1 is characterized in that described low-carbon (LC) chrome-silicon manganese low alloy steel is 30CrMnSi steel, 30CrMnSiNi2 steel or 30CrMnSiNi2A steel.
3. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel according to claim 1 is characterized in that the austenitizing temperature in the processing of said low-carbon (LC) chrome-silicon manganese low alloy steel austenite is the A of low-carbon (LC) chrome-silicon manganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 10s～1800s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.
4. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel; The heat treating method that it is characterized in that low-carbon (LC) chrome-silicon manganese low alloy steel is realized through following steps: one, with after the processing of low-carbon (LC) chrome-silicon manganese low alloy steel austenite, then at the martensite start temperature M of low-carbon (LC) chrome-silicon manganese low alloy steel
sCarry out isothermal quenching or slack quenching under following 170-10 ℃ the temperature, insulation 6s～5400s; Two, low-carbon (LC) chrome-silicon manganese low alloy steel that will be after step 1 is handled is at M
s+ 100 ℃ to M
sIn-100 ℃ the temperature range, isothermal partition thermal treatment 6s～5400s, and then be quenched to room temperature, promptly accomplish the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel.
5. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel according to claim 4 is characterized in that described low-carbon (LC) chrome-silicon manganese low alloy steel is 30CrMnSi steel, 30CrMnSiNi2 steel or 30CrMnSiNi2A steel.
6. the heat treating method of low-carbon (LC) chrome-silicon manganese low alloy steel according to claim 4 is characterized in that the austenitizing temperature in the processing of said low-carbon (LC) chrome-silicon manganese low alloy steel austenite is the A of low-carbon (LC) chrome-silicon manganese low alloy steel
C3More than 30 ℃～50 ℃, soaking time is 10s～1800s, wherein A
C3Ferritic all changes the austenite finishing temperature into during for heating.
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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 |
| CN103215417A (en) * | 2013-05-14 | 2013-07-24 | 哈尔滨工业大学 | Method for ultra-high enhanced heat treatment for medium carbon silicon-manganese-chromium-nickel 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 |
| CN103276164B (en) * | 2013-05-15 | 2014-12-31 | 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 |
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| CN112575256B (en) * | 2020-11-26 | 2021-12-31 | 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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Application publication date: 20120711 |