CN104294014A - Bainite isothermal heat treatment method of medium-carbon silicomanganese nickel-chromium-series low-alloy steel - Google Patents
Bainite isothermal heat treatment method of medium-carbon silicomanganese nickel-chromium-series low-alloy steel Download PDFInfo
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- CN104294014A CN104294014A CN201310301510.8A CN201310301510A CN104294014A CN 104294014 A CN104294014 A CN 104294014A CN 201310301510 A CN201310301510 A CN 201310301510A CN 104294014 A CN104294014 A CN 104294014A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/22—Martempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A bainite isothermal heat treatment method of medium-carbon silicomanganese nickel-chromium-series low-alloy steel aims to solve a problem that performance requirements of some key components cannot be satisfied since yield strength is significantly low when a temper temperature is lower than an isothermally quenching temperature in a conventional isothermal heat treatment technology. The method includes following steps: performing austenitizing treatment to the medium-carbon silicomanganese nickel-chromium-series low-alloy steel; carrying out isothermal oil-quenching or isothermal gas-quenching at a temperature which is higher than a martensite transformation temperature by 5-60 DEG C with the temperature being maintained for 120-180 min; and performing tempering at a temperature which is higher than an isothermal quenching temperature by 10-60 DEG C for 30-150 min. Through treatment by the method, the medium-carbon silicomanganese nickel-chromium-series low-alloy steel has a tensile strength reaching 1590-1980 MPa, a yield strength reaching 1350-1770 MPa and a ductility being 14-25%.
Description
Technical field
The present invention relates to middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method.
Background technology
Middle carbon silicomanganese chromium nickel series low-alloy steel is low-alloy high-strength steel, and its carbon content is generally between 0.25-0.5%, and alloying element total content is not higher than 5%, and wherein Cr, Ni and Mn element has the effect of the hardening capacity improving steel; The interpolation of Mo and V element, can play crystal grain thinning, improves the effect of the microstructure of steel, and can improve steel belt roof bolt ability.Because its intensity is high, middle carbon silicomanganese chromium nickel series low-alloy steel has been applied to undercarriage, rocket body material and engine pump joint spider.Along with the development of aeronautical and space technology, comprehensive strength, the toughness of centering carbon silicomanganese chromium nickel series low-alloy steel it is also proposed more and more higher requirement.
For middle carbon silicomanganese chromium nickel series low-alloy steel, traditional bainite isothermal heat treatment process is: after austempering, carries out a tempering below austempering temperature.But, this traditional technique is when being applied to certain aircraft engine joint spider, multiple batches of product performance are defective, lower than the performance index of σ b >=1570MPa, σ 0.2 >=1285MPa, δ 5 >=9%, the requirement of key components and parts high-strong toughness can not be met, seriously hinder aircraft manufacture progress.Develop a kind of new bainite isothermal heat treatment process for this reason, while this Series Steel tensile strength of guarantee and plasticity index, significantly improve the yield strength of steel, reach obdurability and get both, widen the scope of application of middle carbon silicomanganese chromium nickel series low-alloy steel.
Summary of the invention
The present invention will solve the technology prejudice in existing bainite isothermal heat treatment process, provides a kind of bainite Isothermal treatment novel method of middle carbon silicomanganese chromium nickel series low-alloy steel, makes it possess good obdurability, reach good comprehensive mechanical property.
The invention discloses carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method in one, realized by following steps:
Step 1) centering carbon silicomanganese chromium nickel series low-alloy steel carries out austenitizing process;
Step 2) at the temperature of more than the martensitic transformation starting point Ms of middle carbon silicomanganese chromium nickel series low-alloy steel, carry out isothermal quenching and insulation;
Step 3) by step 2) process after middle carbon silicomanganese chromium nickel series low-alloy steel more than higher than austempering temperature, carry out tempering and insulation.
Middle carbon silicomanganese chromium nickel series low-alloy ladle of the present invention draws together 40SiMnCrNiMoV steel, 37SiMnCrNiMoV steel, 30Si2MnCrMoVE steel or 35SiMnCrMoVA steel.
Step 1 of the present invention) in austenitizing temperature be the A of middle carbon silicomanganese chromium nickel series low-alloy steel
c3above 30 DEG C ~ 50 DEG C, soaking time is 10 ~ 30min, wherein A
c3for finishing temperature when ferrite during heating all changes austenite into.
Step 2 of the present invention) in carry out isothermal quenching at more than martensitic transformation starting point Ms 5 DEG C ~ 60 DEG C centering carbon silicomanganese chromium nickel series low-alloy steel.
Step 2 of the present invention) in the centering carbon silicomanganese chromium nickel series low-alloy steel soaking time of carrying out isothermal quenching be 90 ~ 240min.
Step 3 of the present invention) in more than austempering temperature 5 DEG C ~ 85 DEG C centering carbon silicomanganese chromium nickel series low-alloy steel carry out tempering.
Step 3 of the present invention) in the centering carbon silicomanganese chromium nickel series low-alloy steel soaking time of carrying out tempering be 10 ~ 200min.
Step 2 of the present invention) in isothermal quenching mode be isothermal oil quenching or etc. wet quench.
In the present invention, for a certain specific middle carbon silicomanganese chromium nickel series low-alloy steel, Ms is fixed value, and those skilled in the art very simply just can obtain the martensite point Ms of carbon silicomanganese chromium nickel series low-alloy steel in certain according to common practise.
Different from traditional Q-tempering technique, middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method disclosed by the invention, first centering carbon silicomanganese chromium nickel series low-alloy steel austenitizing, in the bainite transformation temperature interval of middle carbon silicomanganese chromium nickel series low-alloy steel, carry out isothermal quenching, obtain a large amount of bainite and minute quantity does not change austenite; Tempering at higher than the temperature of quenching temperature, produces adverse transformation austenite; When cooling, partial austenitic decomposes, Carbide Precipitation, and form the heterogeneous structure with nano level carbide-free Bainite and residual austenite and a small amount of tiny carbide, final rich carbon austenitic content is between 3% ~ 10%.Relative to traditional Q-tempering technique, bainite isothermal heat treatment process of the present invention makes middle carbon silicomanganese chromium nickel series low-alloy steel when keeping high-tensile and good plasticity and toughness, significantly improves yield strength.
In after middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method of the present invention process, the tensile strength of carbon silicomanganese chromium nickel series low-alloy steel reaches 1590MPa ~ 1980MPa, yield strength reaches 1350MPa ~ 1770MPa, and unit elongation is 14% ~ 25%.Compare prior heat treatment process, the present invention significantly improves yield strength while this steel series of guarantee possesses high tensile and plasticity, and comprehensive mechanical property is significantly improved.Meanwhile, the carbon content that this steel series is different, obtains different high strength, high tenacity coordinates with excellent stress corrosion resistance, thus meet different performance requirements.
Accompanying drawing explanation
Fig. 1 is the metallograph that test 2 processes rear 40SiMnCrNiMoV steel;
Fig. 2 is the XRD figure spectrum that test 2 processes rear 40SiMnCrNiMoV steel;
Fig. 3 is the EBSD photo that test 2 processes rear 40SiMnCrNiMoV steel;
Fig. 4 is the TEM photo that test 2 processes rear 40SiMnCrNiMoV steel.
Embodiment
For the purposes of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, is described in further details the present invention.
Embodiment 1:
Carbon silicomanganese chromium nickel series low-alloy steel in 40SiMnCrNiMoV series is carried out bainite Isothermal treatment, is realized by following steps:
Step 1) by the process of middle carbon silicomanganese chromium nickel series low-alloy steel austenitizing.Described austenitizing temperature is the A of middle carbon silicomanganese chromium nickel series low-alloy steel
c3above 30 DEG C ~ 50 DEG C, soaking time is 10min ~ 30min, wherein A
c3for finishing temperature when ferrite during heating all changes austenite into;
Step 2) carry out isothermal quenching, soaking time 120 ~ 180min in the temperature of more than the martensitic transformation starting point Ms 5 DEG C ~ 60 DEG C of middle carbon silicomanganese chromium nickel series low-alloy steel;
Step 3) by step 2) middle carbon silicomanganese chromium nickel series low-alloy steel 10 DEG C ~ 60 DEG C tempering more than higher than austempering temperature after process, soaking time 30 ~ 150min.
For a certain specific middle carbon silicomanganese chromium nickel series low-alloy steel, martensite point Ms is fixing.
The present embodiment is suitable for the composition (mass percent Wt.%) as shown in table 1 of steel grade:
In table 1 embodiment 1, heat treating method is suitable for the composition (mass percent Wt.%) of steel grade
After the bainite isothermal heat treatment method of the present embodiment, the tensile strength of middle carbon silicomanganese chromium nickel series low-alloy steel reaches 1590MPa ~ 1980MPa, and yield strength reaches 1350MPa ~ 1770MPa, and unit elongation is 14% ~ 25%.Reach the comprehensive mechanical property index request that different superstrength coordinates with excellent plasticity and toughness, can realistic service condition.
Embodiment 2:
The present embodiment is as different from Example 1: step 2) in soaking time be 180 ~ 240min.Other is identical with embodiment 1.
Embodiment 3:
In the present embodiment 40SiMnCrNiMoV series, the bainite isothermal heat treatment method of carbon silicomanganese chromium nickel series low-alloy steel is realized by following steps: be incubated by carbon silicomanganese chromium nickel series low-alloy steel in 40SiMnCrNiMoV series after 15 ~ 20min completes austenitizing process at 850 DEG C ~ 900 DEG C, isothermal quenching is carried out at the temperature of 250 DEG C ~ 300 DEG C, insulation 120 ~ 180min, 10 DEG C ~ 60 DEG C tempering more than higher than quenching temperature again, soaking time 30 ~ 150min.
By the beneficial effect of carbon silicomanganese chromium nickel series low-alloy Heat Treatment Of Steel method in table 2 verification experimental verification the present embodiment 40SiMnCrNiMoV series.
After test 2 process, the metallograph of 40SiMnCrNiMoV steel as shown in Figure 1, can see bainite structure.
After test 2 process, the XRD figure spectrum of 40SiMnCrNiMoV steel as shown in Figure 2, can see martensite and austenite diffraction peak.
The EBSD photo of the 40SiMnCrNiMoV steel after test 2 process as shown in Figure 3, can see bainite and each crystalline orientation austenitic.In figure, martensite has overlapping with austenitic crystalline orientation.Obtaining austenite content is as calculated 5.31%.
The TEM photo of the 40SiMnCrNiMoV steel after test 2 process as shown in Figure 4, can see the size of ferrite lath in the pattern of bainite and bainite.
In table 2 embodiment 2, the bainite isothermal processes of 40SiMnCrNiMoV steel is tested and performance perameter
Embodiment 4:
One of the present embodiment and embodiment 1 to 3 are unlike step 1) described in carbon silicomanganese chromium nickel series low-alloy ladle draw together and be not limited in 37SiMnCrNiMoV steel, 30Si2MnCrMoVE steel or 35SiMnCrMoVA steel.Other is identical with one of embodiment 1 to 3.
Embodiment 5:
One of the present embodiment and embodiment 1 to 4 are unlike step 2) described in soaking time be 90 ~ 210min.Other is identical with embodiment 1 to 4.
Embodiment 6:
One of the present embodiment and embodiment 1 to 5 are unlike step 3) described in tempering temperature more than austempering temperature when 5 DEG C ~ 85 DEG C, also different middle carbon silicomanganese chromium nickel series low-alloy steel can be made to obtain higher tensile strength and certain plasticity, there is good strong plasticity and coordinate.
Embodiment 7:
One of the present embodiment and embodiment 1 to 6 are unlike step 3) described in soaking time when being 10 ~ 100min, 20 ~ 150min, 50 ~ 160min, 60 ~ 170min, 70 ~ 180min, 80 ~ 190min or 90 ~ 200min, in bainite isothermal heat treatment method of the present invention obtains, carbon silicomanganese chromium nickel series low-alloy steel presents stable heterogeneous structure, has good strong plasticity and coordinates.
Above in conjunction with the accompanying drawings and embodiments to invention has been detailed description, obvious specific implementation of the present invention is not subject to the restrictions described above.As long as have employed the unsubstantiality that design of the present invention and technical scheme carry out to improve, or without improvement, design of the present invention and technical scheme are directly applied to other occasions, all in protection scope of the present invention.
Claims (10)
1. a carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method in, is characterized in that this isothermal heat treatment method is realized by following steps:
Step 1) centering carbon silicomanganese chromium nickel series low-alloy steel carries out austenitizing process;
Step 2) carry out isothermal quenching and insulation in the temperature of more than the martensitic transformation starting point Ms of middle carbon silicomanganese chromium nickel series low-alloy steel;
Step 3) by through step 2) middle carbon silicomanganese chromium nickel series low-alloy steel after process carries out tempering and insulation more than higher than austempering temperature.
2. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1, is characterized in that: described step 1) in austenitizing temperature be the A of middle carbon silicomanganese chromium nickel series low-alloy steel
c3above 30 DEG C ~ 50 DEG C, soaking time is 10 ~ 30min, wherein A
c3for finishing temperature when ferrite during heating all changes austenite into.
3. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 1) in centering carbon silicomanganese chromium nickel series low-alloy steel at the temperature of 850 DEG C ~ 900 DEG C, be incubated 15 ~ 20min complete austenitizing process.
4. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 2) in carry out isothermal quenching at more than martensitic transformation starting point Ms 5 DEG C ~ 60 DEG C centering carbon silicomanganese chromium nickel series low-alloy steel.
5. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 2) in the centering carbon silicomanganese chromium nickel series low-alloy steel soaking time of carrying out isothermal quenching be 90 ~ 240min.
6. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 2) in the centering carbon silicomanganese chromium nickel series low-alloy steel soaking time of carrying out isothermal quenching be 120 ~ 180min.
7. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 3) in more than austempering temperature 5 DEG C ~ 85 DEG C centering carbon silicomanganese chromium nickel series low-alloy steel carry out tempering.
8. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 3) in more than austempering temperature 10 DEG C ~ 60 DEG C centering carbon silicomanganese chromium nickel series low-alloy steel carry out tempering.
9. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, is characterized in that: described step 3) in the centering carbon silicomanganese chromium nickel series low-alloy steel soaking time of carrying out tempering be 10 ~ 200min.
10. middle carbon silicomanganese chromium nickel series low-alloy steel bainite isothermal heat treatment method according to claim 1 and 2, it is characterized in that: 40SiMnCrNiMoV steel drawn together by described middle carbon silicomanganese chromium nickel series low-alloy ladle, 37SiMnCrNiMoV steel, 30Si2MnCrMoVE steel or 35SiMnCrMoVA steel.
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| CN201310301510.8A CN104294014B (en) | 2013-07-18 | 2013-07-18 | The bainite isothermal heat treatment method of middle carbon silicomanganese chromium nickel series low-alloy steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384928A (en) * | 2018-03-16 | 2018-08-10 | 燕山大学 | A method of accelerating nanometer bainitic transformation |
| CN112280950A (en) * | 2020-11-23 | 2021-01-29 | 昆山市福玛精密钣金有限公司 | Steel hardening and tempering equipment and efficient vacuum isothermal treatment process thereof |
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| CN101748331A (en) * | 2009-12-24 | 2010-06-23 | 燕山大学 | High-speed railway frog manufactured from nano-bainitic steel with high aluminum content and manufacturing method thereof |
| CN102953006A (en) * | 2012-10-19 | 2013-03-06 | 燕山大学 | Integral hard bainite bearing steel and manufacture method thereof |
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| WO1983001959A1 (en) * | 1981-12-03 | 1983-06-09 | Hauke, Wilhelm | Process for the bainitic hardening at least partially isothermally of a cast iron part |
| JPH01100218A (en) * | 1987-10-13 | 1989-04-18 | Mazda Motor Corp | Manufacture of spheroidal graphite cast-iron product |
| CN1267737A (en) * | 2000-04-20 | 2000-09-27 | 钢铁研究总院 | Isothermal quenching process for preparing delayed fracture resisting high-strength steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384928A (en) * | 2018-03-16 | 2018-08-10 | 燕山大学 | A method of accelerating nanometer bainitic transformation |
| CN112280950A (en) * | 2020-11-23 | 2021-01-29 | 昆山市福玛精密钣金有限公司 | Steel hardening and tempering equipment and efficient vacuum isothermal treatment process thereof |
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| Publication number | Publication date |
|---|---|
| CN104294014B (en) | 2016-12-28 |
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