CN108356417A - A kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity - Google Patents
A kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity Download PDFInfo
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- CN108356417A CN108356417A CN201810121644.4A CN201810121644A CN108356417A CN 108356417 A CN108356417 A CN 108356417A CN 201810121644 A CN201810121644 A CN 201810121644A CN 108356417 A CN108356417 A CN 108356417A
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- high strength
- medium managese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/32—Bonding taking account of the properties of the material involved
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Laser Beam Processing (AREA)
Abstract
The present invention relates to welding and post welding heat treatment technical fields, provide a kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity, the chemical composition of the high strength and ductility medium managese steel is C by weight percentage:0.05~0.45wt.%, Mn:4.50~8.00wt.%, Si:0.01~2.50wt.%, Al：0~3.00wt.%, P:≤ 0.02wt.%, S:≤ 0.02wt.%, Nb:0~0.02wt.%, V:0~0.30wt.%, Ti:0~0.30wt.%, remaining is Fe and inevitable impurity element；This method comprises the following steps：Welded Joints are heat-treated after welding, and using vacuum heat treatment furnace, treatment temperature set is put the workpiece in after reaching set temperature in stove at 650~750 DEG C, protect 5 ± 2min thoroughly, and soaking time is 10min~3h；Welding point is taken out from stove after reaching soaking time, is air-cooled to room temperature.
Description
Technical field
The invention belongs to welding and post welding heat treatment technical field, especially a kind of raising high strength and ductility medium managese steel Laser Welding
The heat treatment method of connector plasticity.
Background technology
In recent years, with the fast development of automobile industry, environmental pollution seriously causes air quality to deteriorate, therefore improves vapour
Vehicle fuel economy reduces energy consumption as the basic goal of automobile industry.Research is found using the advanced high-strength steel of a new generation
Two above target, therefore the basic way for being developed into China Automobile Industry of automobile steel can be reached by reducing car body weight
Diameter.It is the young mobile steel of representative due to having good intensity and plasticity and toughness binding ability using medium managese steel, and by extensive
Concern.
And laser welding is a key link indispensable in automobile industry, uses relatively broad automobile steel at present
Mainly DP steel, TRIP steel, martensite steel and common low-alloy high-strength, the welding method of use be mainly resistance spot welding,
Laser welding, argon tungsten-arc welding etc..There are weld metal zone hardening, heat-affected zone softeneds etc. to ask in laser welding for traditional high-strength steel
Topic, causes tailor welded to appear in joint failure conditions in the processes such as subsequent punch forming, and for using medium managese steel as generation
There is no too many reports at present for laser welding and the connector heat treatment of the young mobile steel of table, therefore for this high strength and ductility
Medium managese steel can obtain high quality using which kind of method welding and heat treatment method, high performance welding point becomes and is badly in need of solving
The problem of.
In the document of the prior art, the heat treatment process work used at present in relation to high strength and ductility medium managese steel is all around mother
What material carried out, for the heat treatment of welding point, there is no relevant reports.
Invention content
The purpose of the present invention is to provide a kind of heat treatment sides for improving high strength and ductility medium managese steel laser weld joint plasticity
Method, improves its comprehensive mechanical property, solve connector quench tissue it is really up to the mark the problems such as, while improving its punch forming performance, it is especially suitable
Close such as preferable steel of medium managese steel quenching degree.
In order to realize the object of the invention, following technical scheme is provided：
A kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity,
A. the chemical composition of the high strength and ductility medium managese steel is C by weight percentage:0.05~0.45wt.%, Mn:4.50
~8.00wt.%, Si:0.01~2.50wt.%, Al：0~3.00 wt.%, P:≤ 0.02wt.%, S:≤ 0.02wt.%,
Nb:0~0.02wt.%, V:0~0.30wt.%, Ti:0~0.30wt.%, remaining is Fe and inevitable impurity element；
This method comprises the following steps：
B. laser welding is carried out after above-mentioned high strength and ductility medium managese steel being docked；
C. Welded Joints are heat-treated after welding, and are to be heated to put workpiece after 650~750 DEG C by heat-treatment furnace
Enter in stove, protect 5 ± 2min thoroughly, keeps the temperature 10min~3h；
D. welding point is taken out from stove after reaching soaking time, is air-cooled to room temperature.
In step b, the retaining wall on slope of high strength and ductility medium managese steel steel plate selects I type grooves；Before welding, steel plate is beaten
Mill, acetone are cleaned, and degrease equal impurity, and workpiece is fixed using suitable fixture, then use optical fiber laser into
Row full penetration.
In step b, the thickness of high strength and ductility medium managese steel steel plate is≤3mm when, it is 1~2kW to weld the laser power used,
Speed of welding is 1.2~3.6m/min.
In step b, when the thickness of high strength and ductility medium managese steel steel plate is 3~8mm, weld the laser power used be 4~
6kW, speed of welding are 1.8~5.4m/min.
Deep penetration welding is used in welding process, and it is 0mm to control defocusing amount, protection gas is argon gas, is carried out using tow sides
Protection, positive air flow amount are 15L/min, and back side throughput is 10L/min.
Vacuum heat treatment furnace is used in step c.
In the heat treatment process, the metallographic structure of weld seam based on martensite by being changed into sheet austenite and iron element
Body.
Test piece for welding surface is carried out to spray anti-oxidation processing before heat treatment.
In step c, soaking time is 0.5~3h.
The chemical composition of the high strength and ductility medium managese steel is C by weight percentage:0.05~0.2wt.%, Mn:4.50~
8.00wt.%, Si:0.01~1.25wt.%, Al：0.02~3.00wt.%, P:≤ 0.02wt.%, S:≤ 0.02wt.%,
Nb:0~0.02wt.%, V:0~0.30wt.%, Ti:0~0.30 wt.%, remaining is Fe and inevitable impurity element.
The laser weld joint of the steel has following mechanical property after above-mentioned heat treatment：Tensile strength 729~
1235MPa, 600~722MPa of yield strength, elongation percentage 27~49%.
The beneficial effects of the present invention are：
Relatively narrow heat affected area can be obtained using laser welding to high strength and ductility medium managese steel, seam organization is with martensite
Main, intensity is high, heat-affected zone softened phenomenon unobvious.After this heat treatment process, weld metal zone is gradually transformed into sheet
Austenite structure and ferritic structure, reduce the hardness of weld metal zone.
The heat treatment method of the present invention is smaller to the base material tissue effect of weldment, because base material is organized as ferrite and Austria
Family name's body, austenite structure thermal stability is relatively preferable in the steel grade base material tissue, and anneal 10min~3h at 650~750 DEG C or less
Time ferritic structure be transformed into austenite structure amount it is less, therefore be heat-treated front and back base material and still keep ferrite and Austria
Family name's body tissue.In this way so that the martensitic structure of weld metal zone, annealing are mainly acted in the annealing process in heat treatment method
Weld metal zone martensitic structure can decompose generation anti-phase and be deformed into austenite structure and ferritic structure in the process.
The present invention can effectively improve the comprehensive mechanical property of laser weld joint, especially processability；It being capable of root
Heat treatment appropriate is carried out according to the characteristic of tissue signature and steel grade, practical application of the steel grade in automobile industry is provided
A kind of possibility.
Description of the drawings
Fig. 1 is high strength and ductility medium managese steel laser welding schematic diagram in the present invention；In figure label for：1 laser beam, 2 protections
Gas, 4 steel plates are protected in gas, 3 backs；
Fig. 2 is the front and back microscopic structure of 1 high strength and ductility medium managese steel laser weld of embodiment of the present invention heat treatment, wherein
A~d is respectively：A- is not heat-treated, b- heat treatment 10min, c- heat treatments 30min, d are heat-treated 3h；
Fig. 3 is each front and back cupping test design sketch (Erichsen number a of sample (a~d) laser weld heat treatment in Fig. 2：
10.05mm；b：8.95mm；c:9.82mm；d:10.03mm).
Specific implementation mode
In the following with reference to the drawings and specific embodiments to the present invention high strength and ductility medium managese steel laser welding and heat treatment do into
One step describes.
Embodiment 1
The chemical composition of the high strength and ductility medium managese steel used in embodiment is C by weight percentage:0.05~
0.10wt.%, Mn:4.50~6.00wt.%, Si:0.01~1.25wt.%, Al：1.00~1.50 wt.%, P:≤
0.02wt.%, S:0.02wt.%, Nb:0~0.01wt.%, V:0~0.30wt.%, Ti:0~0.30wt.%, remaining is
Fe and inevitable impurity element.The specification of high strength and ductility medium managese steel is 150 × 150 × 1.5mm, and base material tensile strength is about
For 780MPa, yield strength is about 610MPa, and extension about 36% of having no progeny, strength and ductility product is about 28GPa%.
Thickness is docked for 1.5mm medium managese steel steel plates, using sand paper polish and cleaned with acetone, then use
Optical fiber laser is welded, welding condition：Laser power 1kW, speed of welding use 2.4m/min, defocusing amount to use
0mm, protection gas are argon gas, and positive air flow amount is 15L/min, and back of the body protection air-flow amount is 10L/min.
Heating, vacuum stove to 650 DEG C, to temperature after test piece for welding is put into vacuum drying oven, carry out 650 DEG C heat treatment, thoroughly protect
5min (thoroughly protect the time be sample be put into stove, sample integrally reaches the time used when set temperature), then keep the temperature 10min,
30min, 3h carry out test piece for welding surface to spray anti-oxidation processing to prevent from aoxidizing before heat treatment；After heat treatment, from
Test piece for welding is taken out in stove, carries out air-cooled processing.Butt joint stretch and cupping is tested.
| Number | Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | Erichsen number (mm) |
| Base material | 780 | 610 | 36 | 10.05 |
| Connector 1 | 778 | 607 | 37 | 8.95 |
| Connector 2 | 781 | 612 | 38 | 9.82 |
| Connector 3 | 772 | 596 | 42 | 10.03 |
As shown in Fig. 2 a~2d, the variation of the front and back metallographic of high strength and ductility medium managese steel laser weld heat treatment；It can in figure
To see, martensitic structure is gradually transformed into ferritic plus austenitic lamella duplex structure after Overheating Treatment.Pass through above-mentioned heat
Processing method can improve its comprehensive mechanical property, while improve forming ability.
Embodiment 2
The chemical composition of the high strength and ductility medium managese steel used in embodiment is C by weight percentage:0.10~
0.20wt.%, Mn:6.00~8.00wt.%, Si:0.01~1.25wt.%, Al：1.5~2.00 wt.%, P:≤
0.02wt.%, S:0.02wt.%, Nb:0~0.02wt.%, V:0~0.20wt.%, Ti:0~0.02wt.%, remaining is
Fe and inevitable impurity element.The specification of high strength and ductility medium managese steel is 150mm × 150mm × 2mm；Its base material tensile strength
About 840MPa, yield strength are about 670MPa, and extension about 50% of having no progeny, strength and ductility product is about 42GPa%.
It is polished the steel plate that two boards thickness is 2mm, acetone cleaning, is welded using optical fiber laser, Welder
Skill parameter：Laser power 2kW, speed of welding use 2.4m/min, and it is argon gas, positive air flow amount that defocusing amount, which uses 0mm, protection gas,
For 15L/min, back of the body protection air-flow amount is 10L/min.
Heating, vacuum stove to 750 DEG C, to temperature after test piece for welding is put into vacuum drying oven, carry out 750 DEG C heat treatment, thoroughly protect
Then 5min keeps the temperature 10min, 30min, 3h, to prevent from aoxidizing, carry out spraying anti-oxidation place to test piece for welding surface before heat treatment
Reason；After heat treatment, test piece for welding is taken out from stove, carries out air-cooled processing.Butt joint sample carries out stretching and cupping test.
| Number | Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | Erichsen number (mm) |
| Base material | 842 | 670 | 51 | 9.17 |
| Connector 4 | 837 | 662 | 41 | 7.74 |
| Connector 5 | 830 | 659 | 43 | 8.18 |
| Connector 6 | 827 | 660 | 49 | 8.57 |
Embodiment 3
The chemical composition of the high strength and ductility medium managese steel used in embodiment is C by weight percentage:0.17~
0.20wt.%, Mn:7.50~8.00wt.%, Si:0.01~1.25wt.%, Al：2.5~3.00wt.%, P:≤
0.02wt.%, S:0.02wt.%, Nb:0~0.02wt.%, V:0~0.20wt.%, Ti:0~0.02wt.%, remaining is
Fe and inevitable impurity element.The specification of high strength and ductility medium managese steel is 150mm × 150mm × 3mm；Its tensile strength is about
1480MPa, yield strength are about 730MPa, and extension about 22% of having no progeny, strength and ductility product is about 32GPa%.
It is polished the steel plate that two boards thickness is 3mm, acetone cleaning, is welded using optical fiber laser, Welder
Skill parameter：Laser power 4kW, speed of welding use 2.4m/min, and it is argon gas, positive air flow amount that defocusing amount, which uses 0mm, protection gas,
For 15L/min, back of the body protection air-flow amount is 10L/min.
Heating, vacuum stove to 750 DEG C, to temperature after test piece for welding is put into vacuum drying oven, carry out 750 DEG C heat treatment, thoroughly protect
Then 5min keeps the temperature 10min, 30min, 3h, to prevent from aoxidizing, carry out spraying anti-oxidation place to test piece for welding surface before heat treatment
Reason；After heat treatment, test piece for welding is taken out from stove, carries out air-cooled processing.Butt joint sample carries out stretching and cupping test.
| Number | Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | Erichsen number (mm) |
| Base material | 1481 | 740 | 22 | 6.23 |
| Connector 7 | 1235 | 722 | 27 | 5.96 |
| Connector 8 | 1156 | 707 | 29 | 6.16 |
| Connector 9 | 1077 | 712 | 30 | 6.38 |
Embodiment 4
The chemical composition of the high strength and ductility medium managese steel used in embodiment is C by weight percentage:0.17~
0.20wt.%, Mn:4.50~5.50wt.%, Si:0.01~1.25wt.%, Al：0.02~0.07wt.%, P:≤
0.02wt.%, S:0.02wt.%, remaining is Fe and inevitable impurity element.The specification of high strength and ductility medium managese steel is
150mm×150mm×2mm；Its tensile strength is about 750MPa, and yield strength is about 600MPa, extension about 36% of having no progeny,
Strength and ductility product is about 27GPa%.
It is polished using sand paper the steel plate that two boards thickness is 2mm, acetone cleaning, is fixed then using fixture after docking
It is welded using optical fiber laser, welding condition：Laser power 2kW, speed of welding use 4.8m/min, defocusing amount to adopt
With 0mm, protection gas is argon gas, and positive air flow amount is 15L/min, and back of the body protection air-flow amount is 10L/min.
Heating, vacuum stove to 650 DEG C, to temperature after test piece for welding is put into vacuum drying oven, carry out 650 DEG C heat treatment, thoroughly protect
Then 5min keeps the temperature 10min, 30min, 3h, to prevent from aoxidizing, carry out spraying anti-oxidation place to test piece for welding surface before heat treatment
Reason；After heat treatment, test piece for welding is taken out from stove, carries out air-cooled processing.Butt joint sample carries out stretching and cupping test.
| Number | Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | Erichsen number (mm) |
| Base material | 756 | 603 | 36 | 9.89 |
| Connector 7 | 750 | 600 | 33 | 8.34 |
| Connector 8 | 747 | 601 | 32 | 8.47 |
| Connector 9 | 729 | 589 | 32 | 9.29 |
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (11)
1. a kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity, it is characterised in that：
A. the chemical composition of the high strength and ductility medium managese steel is C by weight percentage:0.05~0.45wt.%, Mn:4.50~
8.00wt.%, Si:0.01~2.50wt.%, Al：0~3.00wt.%, P:≤ 0.02wt.%, S:≤ 0.02wt.%, Nb:0
~0.02wt.%, V:0~0.30wt.%, Ti:0~0.30wt.%, remaining is Fe and inevitable impurity element；
This method comprises the following steps：
B. laser welding is carried out after above-mentioned high strength and ductility medium managese steel being docked；
C. Welded Joints are heat-treated after welding, and are to put the workpiece in stove after heat-treatment furnace is heated to 650~750 DEG C
In, 5 ± 2min is protected thoroughly, keeps the temperature 10min~3h；
D. welding point is taken out from stove after reaching soaking time, is air-cooled to room temperature.
2. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：In step b,
The retaining wall on slope of high strength and ductility medium managese steel steel plate selects I type grooves；
It before welding, is polished steel plate, acetone scouring, degrease equal impurity, is consolidated to workpiece using suitable fixture
It is fixed, then optical fiber laser is used to carry out full penetration.
3. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
In step b, the thickness of high strength and ductility medium managese steel steel plate is≤3mm when, it is 1~2kW, welding to weld the laser power used
Speed is 1.2~3.6m/min.
4. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
In step b, when the thickness of high strength and ductility medium managese steel steel plate is 3~8mm, it is 4~6kW, weldering to weld the laser power used
It is 1.8~5.4m/min to connect speed.
5. the heat treatment method according to claim 3 or 4 for improving high strength and ductility medium managese steel laser weld joint plasticity,
It is characterized in that：
Deep penetration welding being used in welding process, and it is 0mm to control defocusing amount, protection gas is argon gas, is protected using tow sides,
Positive air flow amount is 15L/min, and back side throughput is 10L/min.
6. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
Vacuum heat treatment furnace is used in step c.
7. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
In the heat treatment process, the metallographic structure of weld seam based on martensite by being changed into sheet austenite and ferrite.
8. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
Test piece for welding surface is carried out to spray anti-oxidation processing before heat treatment.
9. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
In step c, soaking time is 0.5~3h.
10. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
The chemical composition of the high strength and ductility medium managese steel is C by weight percentage:0.05~0.2wt.%, Mn:4.50~
8.00wt.%, Si:0.01~1.25wt.%, Al：0.02~3.00wt.%, P:≤ 0.02wt.%, S:≤ 0.02wt.%,
Nb:0~0.02wt.%, V:0~0.30wt.%, Ti:0~0.30wt.%, remaining is Fe and inevitable impurity element.
11. the heat treatment method according to claim 1 for improving high strength and ductility medium managese steel laser weld joint plasticity, special
Sign is：
The laser weld joint of the steel has following mechanical property after above-mentioned heat treatment：729~1235MPa of tensile strength is bent
Take 600~722MPa of intensity, elongation percentage 27~49%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121644.4A CN108356417B (en) | 2018-02-07 | 2018-02-07 | Heat treatment method for improving plasticity of high-strength-plasticity-product medium manganese steel laser welding joint |
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|---|---|---|---|
| CN201810121644.4A CN108356417B (en) | 2018-02-07 | 2018-02-07 | Heat treatment method for improving plasticity of high-strength-plasticity-product medium manganese steel laser welding joint |
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| CN108356417B CN108356417B (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110055466A (en) * | 2019-05-21 | 2019-07-26 | 安徽工业大学 | The preparation method of hot rolling high-strength medium managese steel of the strength and ductility product greater than 30GPa% |
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| CN106868425A (en) * | 2017-03-16 | 2017-06-20 | 东北大学 | A kind of post weld heat treatment method of Mn tough cut deal welding point low-temperature impact toughness high in 690MPa grades of low C of improvement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004209497A (en) * | 2002-12-27 | 2004-07-29 | Nippon Steel Corp | Method of heat treatment of laser beam welded portion of high-tensile steel plate |
| CN105345232A (en) * | 2015-11-30 | 2016-02-24 | 天津威尔朗科技有限公司 | Gas metal arc welding process for austenite medium-manganese wear-resistant steel |
| CN105945404A (en) * | 2016-06-20 | 2016-09-21 | 安徽省瑞杰锻造有限责任公司 | 27simn alloy steel welding method |
| CN106350741A (en) * | 2016-10-24 | 2017-01-25 | 大连理工大学 | Laser tailor-welded high-strength steel warm forming preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110055466A (en) * | 2019-05-21 | 2019-07-26 | 安徽工业大学 | The preparation method of hot rolling high-strength medium managese steel of the strength and ductility product greater than 30GPa% |
| CN110055466B (en) * | 2019-05-21 | 2020-10-20 | 安徽工业大学 | Preparation method of hot-rolled high-strength medium manganese steel with strength-elongation product of more than 30GPa% |
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| CN108356417B (en) | 2020-04-24 |
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