CN107326160A - A kind of low-carbon C Mn Si systems steel C, Mn with TRIP effects integrate partition heat treatment method - Google Patents
A kind of low-carbon C Mn Si systems steel C, Mn with TRIP effects integrate partition heat treatment method Download PDFInfo
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- CN107326160A CN107326160A CN201710518311.0A CN201710518311A CN107326160A CN 107326160 A CN107326160 A CN 107326160A CN 201710518311 A CN201710518311 A CN 201710518311A CN 107326160 A CN107326160 A CN 107326160A
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C21D2211/005—Ferrite
-
- 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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of low-carbon C Mn Si systems steel C, Mn with TRIP effects integrate the heat treatment method of partition, the low-carbon system cold-rolled steel plates of C Mn Si Jing Guo pre-treatment are incubated 5 10min at 820 DEG C first, it is then heated to 920 DEG C and is incubated 3min, experiment steel temperature is dropped to 870 DEG C again, it is incubated 3 7min, then steel is quenched to 240 260 DEG C, is incubated 10 30s, last water quenching to room temperature.It is 0.1 0.15 ω t the present invention is especially suitable for carbon content.% low-carbon C Mn Si systems steel, can obtain the 15000MPa% of strength and ductility product 14000, and elongation percentage reaches 15% 16%, while having the high strength steel plate of good welds, its microstructure is martensite, ferrite and retained austenite.Meanwhile, using high temperature secondary Mn partitions, the pattern of cryogenic carbon partition improves residual austenite content in stabilization of austenite and Q＆P steel, further improves Q＆P Steel Properties.Austenitizing temperature of the present invention is relatively low, it is possible to decrease heating-up temperature, saves the heat time.Whole heat treatment flow time is also shorter simultaneously, sees and greatly improves production efficiency, saves production cost, had a good application prospect in auto industry.
Description
Technical field
The present invention relates to a kind of heat treatment method of mild steel, more particularly to a kind of low-carbon C-Mn- with TRIP effects
C, Mn of Si systems steel integrate partition heat treatment method, belong to material heat treatment technical field.
Background technology
The lightweight of automobile refers on the premise of vehicle safety performance is ensured, by the optimization to vehicle body structure and
A kind of technology of automobile own wt is reduced to the extensive application of light material.The Lightweight Technology of automobile alleviate the energy,
There are huge potentiality in terms of the crisis of environment.The vehicle body parts that AHSS is manufactured largely are used in automobile body-in-white
In, the own wt of automobile can be effectively reduced in the case where ensureing the security of automobile, improve fuelling rate, reduce tail gas
Discharge.Automotive light weight technology has turned into one of main trend that World Auto Industry develops.
Q＆P steel, i.e. quenching-partition（Quenching-Partitioning, Q＆P）Steel is big by Colorade USA mining industry
Speer professors proposed that the microscopic structure of Q＆P steel was mainly the martensite of poor carbon in 2003, and contained the rich carbon in part
Retained austenite, the presence of retained austenite is because the partition of carbon adds the chemical stability of austenite, thus protects
The effect for being left to retained austenite in room temperature, Q＆P steel is to be changed into martensite when by external forces（TRIP is imitated
Should）, so as to improve the plasticity of Q＆P steel, it is had high intensity and high-ductility concurrently, the TRIP effects of Q＆P steel can not only absorb impact
Can, resist plastic deformation during shock, be obviously improved the safe class of automobile, simultaneously as in Q＆P steel martensitic matrix it is strong
Degree is very high, the thickness of car part suitably can be thinned in the case where not reducing or even improving vehicle safety and reach lightweight
Purpose.
The mother metal of conventional Q＆P heat treatments has the iron of C-Mn-Si systems and C-Mn-Al systems steel, wherein the TRIP steel of C-Mn-Al systems
Ferritic and the phase transition temperature of austenite are higher, or even austenite phase transformation, the implementation of Q＆P techniques do not occur more than 1100 DEG C also
Difficulty is big, and cost is higher.The present invention is from low-carbon C-Mn-Si systems steel, and the phase transition temperature of its ferrite and austenite is relatively low, can be with
Save such as processing time.Carbon content is relatively low can to ensure that steel plate has good weldability.But carbon content is low to influence traditional Q＆P
The partition process of carbon in technical process, reduces stabilization of austenite；Cause carbon content in martensite relatively low, reduction martensite is strong
Degree.Cause the low-carbon C-Mn-Si systems steel strength and ductility product after heat treatment relatively low.Moreover, the existing Q＆P Technologies for Heating Processing time is longer,
The cooperation of parameter still needs to further exploration.
The content of the invention
For the problem of Technology for Heating Processing is present in the prior art, it is proposed that a kind of low-carbon C-Mn- with TRIP effects
Si systems steel C, Mn integrate the heat treatment method of partition, it is therefore an objective to matched somebody with somebody by first time Mn partition, austenitizing, secondary Mn partitions, C
Divide rational mutual cooperation, produce the low-carbon C-Mn-Si systems Q＆P steel with good welds, strength and ductility product.It is particularly suitable for use in carbon
Content is 0.1-0.15 ω t% low-carbon C-Mn-Si systems steel.In addition to C element, allow Mn elements to also take on a part and improve austenite
The task of stability.So as to form high temperature Mn partitions, the pattern of cryogenic carbon partition.The synthesis partition of C, Mn element is made full use of
Increase the content of retained austenite in the stability and Q＆P steel of austenite.So as to obtain the higher low cost of strength and ductility product and weldability
Good high-strength steel sheet.The heat treatment method austenitizing temperature is relatively low, only 920 DEG C, and this reduces heating-up temperature, section
Save the heat time.Whole heat treatment flow time is also shorter simultaneously, and the production efficiency that steel is significantly increased is high, and saving is produced into
This, has a good application prospect in auto industry.
Realize that the technical scheme of the object of the invention is followed the steps below：（1）First time Mn partition：Pre-treatment will be passed through
Low-carbon C-Mn-Si systems steel be heated to 820 DEG C of two-phase section and be incubated 5-10min.
（2）Complete austenitizing：920 DEG C of austenitic area is heated to, and is incubated 3min, complete austenitizing is allowed to.
（3）Second of Mn partition：Experiment steel temperature is dropped to 870 DEG C, 3-7min is incubated, carries out second of Mn partition.
（4）Carbon partition：Insulation is quenched to rapidly 240-260 DEG C after terminating, the control partition time is in 10-30s, then water quenching
To room temperature.Obtain strength and ductility product 14000-15000MPa%, elongation percentage 15%-16% Q＆P steel plates.
Described pre-treatment is to soak low-carbon C-Mn-Si system cold-rolled steel plates using liquid detergent to clean after a period of time, is removed
Rust is air-dried after deoiling, and makes any surface finish, heated uneven during heat treatment to avoid.
Compared with prior art, the features of the present invention and beneficial effect are：By the Optimal improvements to traditional Q＆P techniques,
The technique for employing secondary Mn partitions plus carbon partition, makes Mn elements also take on the task that a part improves the stability of austenite,
Form high temperature Mn partitions, the pattern of cryogenic carbon partition.The synthesis partition of C, Mn element is made full use of to increase the stabilization of austenite
The content of retained austenite, further improves the performance of Q＆P steel, Q＆P techniques is played it to greatest extent in property and Q＆P steel
Advantage.Carbon content is particularly suitable for use in for 0.1-0.15 ω t% low-carbon C-Mn-Si systems steel.
The step（1）It is middle that steel is heated to 820 DEG C and 5-10min is incubated, carry out first time Mn partition, it is therefore an objective to make iron
Mn element aggregations in ferritic are into austenite.
The step（2）Middle austenitizing temperature and time are 920 DEG C of insulation 3min, the choosing of austenitizing temperature and time
Selecting should consider to obtain fully austenitic structure, while preventing from homogenizing with the Mn assigned in austenite for the first time.
The step（3）, experiment steel temperature is dropped to 870 DEG C, 3-7min is incubated, second of Mn partition is carried out.Second
The temperature of Mn partitions is higher than for the first time, and its main cause is the ferritic content of control, and temperature is too low, then ferrite content is high,
The tensile strength of final steel plate can be influenceed.
The step（4）The middle experiment steel by after the completion of secondary Mn partitions is quenched to 240-260 DEG C in salt bath furnace rapidly,
10-30s is incubated, carbon is carried out and matches somebody with somebody division technique.Carbon in this insulating process will from martensite into austenite partition,
Austenite is set to occur thermostabilization and finally remain into room temperature.Room temperature texture is finally given for martensite, retained austenite and is lacked
Measure ferritic Q＆P steel.
Technology for Heating Processing in the present invention, by the partition twice of Mn elements at high temperature, then coordinates the carbon of lower temperature
Partition, makes full use of the synthesis partition of C, Mn element to lift the stability of austenite, and retained austenite contains in increase Q＆P steel
Amount, so as to greatly improve the strength and ductility product of steel by the TRIP effects of retained austenite.Compared to conventional Q＆P Technologies for Heating Processing, sheet
C, Mn in invention, which integrate partition, can improve the stability of austenite, improve the strength and ductility product of material.Stretched and tried using standard national standard
What sample was measured, numerical value is reliable.Had a good application prospect in auto industry.
Austenitizing temperature is low in Technology for Heating Processing of the present invention, and soaking time is shorter, and this reduces heating-up temperature, section
Heat treatment time is saved.The production efficiency of steel can be significantly increased and cost-effective compared to other Technologies for Heating Processing,
There is more preferable application prospect in industrial production.
Brief description of the drawings
Fig. 1 is Technology for Heating Processing schematic diagram of the present invention.
Fig. 2 is low-carbon C-Mn-Si systems steel scanning electron microscope image in the embodiment of the present invention 1.
Fig. 3 is the backscattered electron image of low-carbon C-Mn-Si systems steel in the embodiment of the present invention 2.
Fig. 4 is the Images of Electron Probe of low-carbon C-Mn-Si systems steel Mn elements in the embodiment of the present invention 2.
Fig. 5 is the Images of Electron Probe of low-carbon C-Mn-Si systems steel C element in the embodiment of the present invention 2.
Embodiment
It is that the steel plate that will be thermally treated resulting in is processed into gauge length with wire cutting machine by ASTM E8 standards and is in the embodiment of the present invention
32mm tensile sample, and tension test is carried out on universal tensile testing machine, strain rate is 1mm/min, tests its tension
Intensity elongation percentage and strength and ductility product, 3 samples, results averaged, to ensure the reliability of experimental data are taken per embodiment.
Embodiment 1
Composition is cleaned up for 0.12C-1.5Mn-1.1Si cold-rolled steel sheet, derusting is air-dried after deoiling, and makes any surface finish.With
Avoid the heated inequality in heat treatment process.
（1）First time Mn partition：Low-carbon C-Mn-Si steel Jing Guo pre-treatment is heated to 820 DEG C of two-phase section and is incubated
5min。
（2）Complete austenitizing：920 DEG C of austenitic area is heated to, and is incubated 3min, complete austenitizing is allowed to.
（3）Second of Mn partition：Experiment steel temperature is dropped to 870 DEG C, 5min is incubated, carries out second of Mn partition.
（4）Carbon partition：Insulation is quenched to rapidly 260 DEG C after terminating, control the partition time in 20s, last water quenching to room temperature.
Fig. 2 is the scanning electron microscope image for the low-carbon C-Mn-Si systems steel that Technology for Heating Processing is obtained.Microscopic structure is main by geneva
Body, ferrite, retained austenite composition.Martensite is typical lath-shaped, a small amount of ferrite in it is block, granular or other not
The form of rule is evenly distributed on martensitic matrix.
After testing, its tensile strength is 960MPa, and elongation after fracture is 15.4%, and strength and ductility product reaches 14800MPa%.
Embodiment 2
Composition is cleaned up for 0.12C-1.5Mn-1.1Si cold-rolled steel sheet, derusting is air-dried after deoiling, and makes any surface finish.With
Avoid the heated inequality in heat treatment process.
（1）First time Mn partition：Low-carbon C-Mn-Si steel Jing Guo pre-treatment is heated to 820 DEG C of two-phase section and is incubated
7min。
（2）Complete austenitizing：920 DEG C of austenitic area is heated to, and is incubated 3min, complete austenitizing is allowed to.
（3）Second of Mn partition：Experiment steel temperature is dropped to 870 DEG C, 7min is incubated, carries out second of Mn partition.
（4）Carbon partition：Insulation is quenched to rapidly 240 DEG C after terminating, control the partition time in 30s, last water quenching to room temperature.
According to back scattering and Images of Electron Probe, bossing is martensite, and sunk part is ferrite.Martensite is by Austria
Family name's body is transformed, it can be seen that C, Mn element partition effect in austenite are obvious.
After testing, its tensile strength is 946MPa, and elongation after fracture is 15.5%, and strength and ductility product reaches 14700MPa%.
Embodiment 3
Composition is cleaned up for 0.12C-1.5Mn-1.1Si cold-rolled steel sheet, derusting is air-dried after deoiling, and makes any surface finish.With
Avoid the heated inequality in heat treatment process.
（1）First time Mn partition：Low-carbon C-Mn-Si steel Jing Guo pre-treatment is heated to 820 DEG C of two-phase section and is incubated
7min。
（2）Complete austenitizing：920 DEG C of austenitic area is heated to, and is incubated 3min, complete austenitizing is allowed to.
（3）Second of Mn partition：Experiment steel temperature is dropped to 870 DEG C, 5min is incubated, carries out second of Mn partition.
（4）Carbon partition：Insulation is quenched to rapidly 260 DEG C after terminating, control the partition time in 20s, last water quenching to room temperature.
After testing, its tensile strength is 940MPa, and elongation after fracture is 15.6%, and strength and ductility product reaches 14700MPa%.
Claims (2)
1. a kind of low-carbon C-Mn-Si systems steel C, Mn with TRIP effects integrate partition heat treatment method, it is characterised in that according to
Following steps are carried out：
（1）First time Mn partition：Low-carbon C-Mn-Si systems steel Jing Guo pre-treatment is heated to 820 DEG C of two-phase section and 5- is incubated
10min；
（2）Complete austenitizing：920 DEG C of austenitic area is heated to, and is incubated 3min, complete austenitizing is allowed to；
（3）Second of Mn partition：Experiment steel temperature is dropped to 870 DEG C, 3-7min is incubated, carries out second of Mn partition；
（4）Carbon partition：Insulation is quenched to rapidly 240 DEG C -260 DEG C after terminating, the control partition time, last water quenching was extremely in 10-30s
Room temperature, obtains strength and ductility product 14000-15000MPa%, elongation percentage 15%-16% Q＆P steel plates.
2. a kind of Q＆P of low-carbon C-Mn-Si systems steel with TRIP effects according to claim 1 heat treatment side
Method, it is characterised in that described pre-treatment is that the system cold-rolled steel plates of low-carbon C-Mn-Si that this is had into TRIP effects use liquid detergent
Soak and cleaned after a period of time, derusting is air-dried after deoiling, and makes any surface finish, it is heated uneven during heat treatment to avoid.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825683A (en) * | 2018-08-14 | 2019-05-31 | 山东建筑大学 | A kind of manganese partition and reverted austenite 800MPa low-carbon Q&P steel Preparation Method |
| CN112899463A (en) * | 2021-01-15 | 2021-06-04 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Postweld low-temperature distribution method for improving toughness of low-phase-change deposited metal with dual-phase structure |
| CN113789432A (en) * | 2021-09-16 | 2021-12-14 | 昆明理工大学 | Method for improving local hardening of SA508-4 steel welded structure |
| CN114262778A (en) * | 2021-12-27 | 2022-04-01 | 中国科学院金属研究所 | Medium manganese steel plate and preparation method thereof |
| CN117887932A (en) * | 2024-01-30 | 2024-04-16 | 桂林理工大学 | Heat treatment process for improving comprehensive mechanical properties of C-Mn-Si dual-phase steel and heat treated dual-phase steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825683A (en) * | 2018-08-14 | 2019-05-31 | 山东建筑大学 | A kind of manganese partition and reverted austenite 800MPa low-carbon Q&P steel Preparation Method |
| CN112899463A (en) * | 2021-01-15 | 2021-06-04 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Postweld low-temperature distribution method for improving toughness of low-phase-change deposited metal with dual-phase structure |
| CN113789432A (en) * | 2021-09-16 | 2021-12-14 | 昆明理工大学 | Method for improving local hardening of SA508-4 steel welded structure |
| CN113789432B (en) * | 2021-09-16 | 2023-01-24 | 昆明理工大学 | Method for improving local hardening of SA508-4 steel welded structure |
| CN114262778A (en) * | 2021-12-27 | 2022-04-01 | 中国科学院金属研究所 | Medium manganese steel plate and preparation method thereof |
| CN114262778B (en) * | 2021-12-27 | 2023-01-06 | 中国科学院金属研究所 | Medium manganese steel plate and preparation method thereof |
| CN117887932A (en) * | 2024-01-30 | 2024-04-16 | 桂林理工大学 | Heat treatment process for improving comprehensive mechanical properties of C-Mn-Si dual-phase steel and heat treated dual-phase steel |
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