CN108356417B - Heat treatment method for improving plasticity of high-strength-plasticity-product medium manganese steel laser welding joint - Google Patents
Heat treatment method for improving plasticity of high-strength-plasticity-product medium manganese steel laser welding joint Download PDFInfo
- Publication number
- CN108356417B CN108356417B CN201810121644.4A CN201810121644A CN108356417B CN 108356417 B CN108356417 B CN 108356417B CN 201810121644 A CN201810121644 A CN 201810121644A CN 108356417 B CN108356417 B CN 108356417B
- Authority
- CN
- China
- Prior art keywords
- heat treatment
- strength
- manganese steel
- treatment method
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Abstract
The invention relates to the technical field of welding and postweld heat treatment, and provides a heat treatment method for improving the plasticity of a manganese steel laser welding joint in a high strength-plasticity product, wherein the manganese steel in the high strength-plasticity product comprises the following chemical components in percentage by weight of 0.05-0.45 wt% of C, 4.50-8.00 wt% of Mn, 0.01-2.50 wt% of Si, Al: 0-3.00 wt%, P is less than or equal to 0.02 wt%, S is less than or equal to 0.02 wt%, Nb is 0-0.02 wt%, V is 0-0.30 wt%, Ti is 0-0.30 wt%, and the balance is Fe and inevitable impurity elements; the method comprises the following steps: carrying out heat treatment on the welded joint after welding, adopting a vacuum heat treatment furnace, setting the heat treatment temperature at 650-750 ℃, putting the workpiece into the furnace after the set temperature is reached, and completely keeping for 5 +/-2 min, wherein the heat preservation time is 10 min-3 h; and taking out the welded joint from the furnace after the heat preservation time is reached, and air-cooling to room temperature.
Description
Technical Field
The invention belongs to the technical field of welding and postweld heat treatment, and particularly relates to a heat treatment method for improving the plasticity of a high-strength-plasticity medium manganese steel laser welding joint.
Background
In recent years, with the rapid development of the automobile industry, air quality is deteriorated due to serious environmental pollution, so that the improvement of the automobile fuel economy and the reduction of energy consumption become the fundamental targets of the automobile industry. Research finds that the new generation of advanced high-strength steel can achieve the above two aims by reducing the weight of the automobile body, so the development of the automobile steel becomes a fundamental way for the development of the automobile industry. The new generation of automotive steels, represented by medium manganese steels, have received much attention because of their good strength and ductility-toughness bonding ability.
Laser welding is an indispensable key link in the automobile industry, automobile steels widely used at present mainly comprise DP steel, TRIP steel, martensite steel and common low-alloy high-strength steel, and the adopted welding methods mainly comprise resistance spot welding, laser welding, tungsten electrode argon arc welding and the like. The problems of weld zone hardening, heat affected zone softening and the like of the traditional high-strength steel during laser welding cause failure of a tailor-welded blank at a joint in subsequent processes of stamping forming and the like, but laser welding and joint heat treatment of new generation automobile steel represented by medium manganese steel are not reported so far, so that the problem that the welding and heat treatment method adopted by the medium manganese steel with high strength-elongation product can obtain a high-quality and high-performance welded joint becomes an urgent need to be solved.
In the prior art documents, the work of the heat treatment process adopted by manganese steel at present in high strength-elongation product is performed around the base metal, and no relevant report is provided for the heat treatment of the welded joint.
Disclosure of Invention
The invention aims to provide a heat treatment method for improving the plasticity of a laser welding joint of high-strength-plasticity medium manganese steel, which improves the comprehensive mechanical property, solves the problems of over-hardening of a quenching structure of the joint and the like, improves the punch forming property of the joint, and is particularly suitable for steel with better hardenability, such as medium manganese steel and the like.
In order to realize the purpose of the invention, the following technical scheme is provided:
a heat treatment method for improving the plasticity of a manganese steel laser welding joint in high strength-elongation product,
a. the high-strength plastic-product medium manganese steel comprises the following chemical components in percentage by weight of 0.05-0.45 wt% of C, 4.50-8.00 wt% of Mn, 0.01-2.50 wt% of Si, and Al: 0-3.00 wt%, P is less than or equal to 0.02 wt%, S is less than or equal to 0.02 wt%, Nb is 0-0.02 wt%, V is 0-0.30 wt%, Ti is 0-0.30 wt%, and the balance is Fe and inevitable impurity elements;
the method comprises the following steps:
b. butt-jointing the high-strength plastic product medium manganese steel and then performing laser welding;
c. after welding, carrying out heat treatment on the welded joint, namely heating a heat treatment furnace to 650-750 ℃, putting the workpiece into the furnace, keeping the temperature for 5 +/-2 min thoroughly, and keeping the temperature for 10 min-3 h;
d. and taking out the welded joint from the furnace after the heat preservation time is reached, and air-cooling to room temperature.
In the step b, an I-shaped groove is selected for groove processing of the high-strength-plastic-product medium manganese steel plate; before welding, the steel plate is polished and scrubbed by acetone, impurities such as oil stains and the like are removed, a workpiece is fixed by adopting a proper clamp, and then full penetration welding is carried out by adopting a fiber laser.
In the step b, when the thickness of the manganese steel plate in the high product of strength and elongation is less than or equal to 3mm, the laser power used for welding is 1-2 kW, and the welding speed is 1.2-3.6 m/min.
In the step b, when the thickness of the high-strength plastic product medium manganese steel plate is 3-8 mm, the laser power used for welding is 4-6 kW, and the welding speed is 1.8-5.4 m/min.
In the welding process, deep fusion welding is adopted, defocusing amount is controlled to be 0mm, the shielding gas is argon, the front surface and the back surface are used for shielding, the front surface gas flow is 15L/min, and the back surface gas flow is 10L/min.
A vacuum heat treatment furnace is used in step c.
During the heat treatment, the metallographic structure of the weld is transformed from martensite mainly into lamellar austenite and ferrite.
And before heat treatment, the surface of the welding test plate is subjected to spraying anti-oxidation treatment.
In the step c, the heat preservation time is 0.5-3 h.
The high-strength plastic-product medium manganese steel comprises the following chemical components in percentage by weight of 0.05-0.2 wt% of C, 4.50-8.00 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 0.02-3.00 wt%, P less than or equal to 0.02 wt%, S less than or equal to 0.02 wt%, Nb 0-0.02 wt%, V0-0.30 wt%, Ti 0-0.30 wt%, and the balance of Fe and inevitable impurity elements.
After the laser welding joint of the steel is subjected to the heat treatment, the steel has the following mechanical properties: the tensile strength is 729-1235 MPa, the yield strength is 600-722 MPa, and the elongation is 27-49%.
The invention has the beneficial effects that:
the high-strength plastic medium manganese steel is subjected to laser welding to obtain a narrower heat-affected zone, the weld joint structure mainly comprises martensite, the strength is high, and the softening phenomenon of the heat-affected zone is not obvious. After the heat treatment process is adopted, the weld zone is gradually transformed into lamellar austenite tissues and ferrite tissues, and the hardness of the weld zone is reduced.
The heat treatment method of the invention has little influence on the base material structure of the welding part, because the base material structure is ferrite and austenite, the heat stability of the austenite structure in the base material structure of the steel is relatively good, the amount of the ferrite structure transformed into the austenite structure is less when annealing is carried out for 10 min-3 h at the temperature of 650-750 ℃, therefore, the base material still keeps the ferrite and austenite structures before and after heat treatment. Therefore, the martensite structure in the welding seam area is mainly acted in the annealing process in the heat treatment method, and the martensite structure in the welding seam area is decomposed and reversely transformed to form an austenite structure and a ferrite structure in the annealing process.
The invention can effectively improve the comprehensive mechanical property, especially the forming property, of the laser welding joint; the ability to perform appropriate heat treatments based on the structural characteristics and the characteristics of the steel grade provides a possibility for practical use of the steel grade in the automotive industry.
Drawings
FIG. 1 is a schematic view of laser welding of high product of strength and elongation medium manganese steel in the present invention; labeled as: 1 laser beam, 2 shielding gas, 3 back shielding gas and 4 steel plate;
FIG. 2 shows the microstructure of a high-product-of-strength medium-elongation manganese steel laser welded seam before and after heat treatment in example 1 of the present invention, wherein a to d are respectively: a-non-heat treatment, b-heat treatment for 10min, c-heat treatment for 30min, d heat treatment for 3 h;
FIG. 3 is a graph showing the effect of cupping test before and after heat treatment of the laser weld of each of the samples (a-d) of FIG. 2 (cupping value a: 10.05 mm; b: 8.95 mm; c:9.82 mm; d:10.03 mm).
Detailed Description
The laser welding and heat treatment of the high-strength-product medium manganese steel of the invention are further described with reference to the accompanying drawings and specific examples.
Example 1
The manganese steel in the high strength and elongation product used in the embodiment comprises the following chemical components in percentage by weight of 0.05-0.10 wt% of C, 4.50-6.00 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 1.00-1.50 wt.%, P is less than or equal to 0.02 wt.%, S is 0.02 wt.%, Nb is 0-0.01 wt.%, V is 0-0.30 wt.%, Ti is 0-0.30 wt.%, and the balance is Fe and inevitable impurity elements. The specification of the high-strength-ductility medium manganese steel is 150 multiplied by 1.5mm, the tensile strength of a mother material is about 780MPa, the yield strength is about 610MPa, the elongation after fracture is about 36 percent, and the strength-ductility product is about 28 GPa.
Butt-jointing the medium manganese steel plates with the thickness of 1.5mm, polishing by using sand paper and cleaning by using acetone, and then welding by using a fiber laser, wherein the welding process parameters are as follows: the laser power is 1kW, the welding speed is 2.4m/min, the defocusing amount is 0mm, the shielding gas is argon, the front-side gas flow is 15L/min, and the back-side shielding gas flow is 10L/min.
Heating a vacuum furnace to 650 ℃, putting the welding test plate into the vacuum furnace after reaching the temperature, carrying out heat treatment at 650 ℃, keeping for 5min (the time for keeping is the time for putting the sample into the furnace and the whole sample reaches the set temperature), then keeping for 10min, 30min and 3h, and spraying anti-oxidation treatment on the surface of the welding test plate before heat treatment for preventing oxidation; after the heat treatment, the welded test plate was taken out of the furnace and air-cooled. The joint was subjected to tensile and cupping tests.
| Numbering | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Cupping value (mm) |
| Base material | 780 | 610 | 36 | 10.05 |
| Joint 1 | 778 | 607 | 37 | 8.95 |
| Joint 2 | 781 | 612 | 38 | 9.82 |
| |
772 | 596 | 42 | 10.03 |
As shown in fig. 2a to 2d, the metallographic phase changes before and after the heat treatment of the welding seam of the manganese steel laser welding in the high product of strength and elongation; it can be seen that the martensite structure is gradually transformed into a ferrite plus austenite sheet dual-phase structure after heat treatment. By the heat treatment method, the comprehensive mechanical property of the composite material can be improved, and the forming capability is improved.
Example 2
The manganese steel in the high strength and elongation product used in the embodiment comprises the following chemical components in percentage by weight of 0.10-0.20 wt% of C, 6.00-8.00 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 1.5-2.00 wt%, P is less than or equal to 0.02 wt%, S is 0.02 wt%, Nb is 0-0.02 wt%, V is 0-0.20 wt%, Ti is 0-0.02 wt%, and the balance is Fe and inevitable impurity elements. The specification of the high strength-ductility medium manganese steel is 150mm multiplied by 2 mm; the tensile strength of the parent metal is about 840MPa, the yield strength is about 670MPa, the elongation after fracture is about 50 percent, and the product of strength and elongation is about 42 GPa.
Two steel plates with the plate thickness of 2mm are polished and cleaned by acetone, a fiber laser is adopted for welding, and the welding process parameters are as follows: the laser power is 2kW, the welding speed is 2.4m/min, the defocusing amount is 0mm, the shielding gas is argon, the front-side gas flow is 15L/min, and the back-side shielding gas flow is 10L/min.
Heating the vacuum furnace to 750 ℃, putting the welding test plate into the vacuum furnace after reaching the temperature, carrying out heat treatment at 750 ℃ for 5min thoroughly, then carrying out heat preservation for 10min, 30min and 3h, and carrying out spraying anti-oxidation treatment on the surface of the welding test plate before heat treatment for preventing oxidation; after the heat treatment, the welded test plate was taken out of the furnace and air-cooled. Tensile and cupping tests were performed on the joint specimens.
| Numbering | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Cupping value (mm) |
| Base material | 842 | 670 | 51 | 9.17 |
| Joint 4 | 837 | 662 | 41 | 7.74 |
| Joint 5 | 830 | 659 | 43 | 8.18 |
| Joint 6 | 827 | 660 | 49 | 8.57 |
Example 3
The manganese steel used in the embodiment comprises the following chemical components in percentage by weight of 0.17-0.20 wt% of C, 7.50-8.00 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 2.5-3.00 wt%, P is less than or equal to 0.02 wt%, S is 0.02 wt%, Nb is 0-0.02 wt%, V is 0-0.20 wt%, Ti is 0-0.02 wt%, and the balance is Fe and inevitable impurity elements. The specification of the high strength-ductility medium manganese steel is 150mm multiplied by 3 mm; the tensile strength is about 1480MPa, the yield strength is about 730MPa, the elongation after fracture is about 22 percent, and the product of strength and elongation is about 32 GPa.
Two steel plates with the plate thickness of 3mm are polished and cleaned by acetone, a fiber laser is adopted for welding, and the welding process parameters are as follows: the laser power is 4kW, the welding speed is 2.4m/min, the defocusing amount is 0mm, the shielding gas is argon, the front-side gas flow is 15L/min, and the back-side shielding gas flow is 10L/min.
Heating the vacuum furnace to 750 ℃, putting the welding test plate into the vacuum furnace after reaching the temperature, carrying out heat treatment at 750 ℃ for 5min thoroughly, then carrying out heat preservation for 10min, 30min and 3h, and carrying out spraying anti-oxidation treatment on the surface of the welding test plate before heat treatment for preventing oxidation; after the heat treatment, the welded test plate was taken out of the furnace and air-cooled. Tensile and cupping tests were performed on the joint specimens.
| Numbering | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Cupping value (mm) |
| Base material | 1481 | 740 | 22 | 6.23 |
| Joint 7 | 1235 | 722 | 27 | 5.96 |
| Joint 8 | 1156 | 707 | 29 | 6.16 |
| Joint 9 | 1077 | 712 | 30 | 6.38 |
Example 4
The manganese steel used in the embodiment comprises the following chemical components in percentage by weight of 0.17-0.20 wt% of C, 4.50-5.50 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 0.02-0.07 wt%, P is less than or equal to 0.02 wt%, S is 0.02 wt%, and the balance is Fe and inevitable impurity elements. The specification of the high strength-ductility medium manganese steel is 150mm multiplied by 2 mm; the tensile strength is about 750MPa, the yield strength is about 600MPa, the elongation after fracture is about 36 percent, and the product of strength and elongation is about 27 GPa.
Adopt abrasive paper to polish, acetone washs two steel sheets that the board is 2mm thick, adopt anchor clamps fixed then adopt fiber laser to weld after the butt joint, welding process parameters: the laser power is 2kW, the welding speed is 4.8m/min, the defocusing amount is 0mm, the shielding gas is argon, the front-side gas flow is 15L/min, and the back-side shielding gas flow is 10L/min.
Heating the vacuum furnace to 650 ℃, putting the welding test plate into the vacuum furnace after reaching the temperature, carrying out 650 ℃ heat treatment, thoroughly preserving for 5min, then preserving heat for 10min, 30min and 3h, and spraying anti-oxidation treatment on the surface of the welding test plate before heat treatment for preventing oxidation; after the heat treatment, the welded test plate was taken out of the furnace and air-cooled. Tensile and cupping tests were performed on the joint specimens.
| Numbering | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Cupping value (mm) |
| Base material | 756 | 603 | 36 | 9.89 |
| Joint 7 | 750 | 600 | 33 | 8.34 |
| Joint 8 | 747 | 601 | 32 | 8.47 |
| Joint 9 | 729 | 589 | 32 | 9.29 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (8)
1. A heat treatment method for improving the plasticity of a manganese steel laser welding joint in a high strength-plastic product is characterized by comprising the following steps:
a. the high-strength plastic-product medium manganese steel comprises the following chemical components in percentage by weight of 0.05-0.45 wt% of C, 4.50-8.00 wt% of Mn, 0.01-2.50 wt% of Si, and Al: 0-3.00 wt%, P is less than or equal to 0.02 wt%, S is less than or equal to 0.02 wt%, Nb is 0-0.02 wt%, V is 0-0.30 wt%, Ti is 0-0.30 wt%, and the balance is Fe and inevitable impurity elements;
the method comprises the following steps:
b. butt-jointing the high-strength plastic product medium manganese steel and then performing laser welding;
in the step b, when the thickness of the manganese steel plate in the high product of strength and elongation is less than or equal to 3mm, the laser power used for welding is 1-2 kW, and the welding speed is 1.2-3.6 m/min; when the thickness of the high-strength plastic-product medium manganese steel plate is 3-8 mm, the laser power used for welding is 4-6 kW, and the welding speed is 1.8-5.4 m/min;
in the welding process, deep fusion welding is adopted, defocusing amount is controlled to be 0mm, shielding gas is argon, the front side and the back side are used for shielding, the front side gas flow is 15L/min, and the back side gas flow is 10L/min;
c. after welding, carrying out heat treatment on the welded joint, namely heating a heat treatment furnace to 650-750 ℃, putting the workpiece into the furnace, keeping the temperature for 5 +/-2 min thoroughly, and keeping the temperature for 10 min-3 h;
d. and taking out the welded joint from the furnace after the heat preservation time is reached, and air-cooling to room temperature.
2. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps: in the step (b), the step (c),
the groove processing of the high-strength plastic product medium manganese steel plate selects an I-shaped groove;
before welding, the steel plate is polished and scrubbed by acetone, impurities such as oil stains and the like are removed, a workpiece is fixed by adopting a proper clamp, and then full penetration welding is carried out by adopting a fiber laser.
3. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
a vacuum heat treatment furnace is used in step c.
4. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
during the heat treatment, the metallographic structure of the weld is transformed from martensite mainly into lamellar austenite and ferrite.
5. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
and before heat treatment, the surface of the welding test plate is subjected to spraying anti-oxidation treatment.
6. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
in the step c, the heat preservation time is 0.5-3 h.
7. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
the high-strength plastic-product medium manganese steel comprises the following chemical components in percentage by weight of 0.05-0.2 wt% of C, 4.50-8.00 wt% of Mn, 0.01-1.25 wt% of Si, and Al: 0.02-3.00 wt%, P less than or equal to 0.02 wt%, S less than or equal to 0.02 wt%, Nb 0-0.02 wt%, V0-0.30 wt%, Ti 0-0.30 wt%, and the balance of Fe and inevitable impurity elements.
8. The heat treatment method for improving the plasticity of the high-strength-product medium-manganese steel laser welding joint according to claim 1, wherein the heat treatment method comprises the following steps:
after the laser welding joint of the steel is subjected to the heat treatment, the steel has the following mechanical properties: the tensile strength is 729-1235 MPa, the yield strength is 600-722 MPa, and the elongation is 27-49%.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108356417A CN108356417A (en) | 2018-08-03 |
| CN108356417B true CN108356417B (en) | 2020-04-24 |
Family
ID=63004928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810121644.4A Active 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108356417B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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% |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4577811B2 (en) * | 2002-12-27 | 2010-11-10 | 新日本製鐵株式会社 | Heat treatment method for laser welds of high strength steel plates |
| CN105345232B (en) * | 2015-11-30 | 2017-10-20 | 天津威尔朗科技有限公司 | Manganese wear-resistant steel gas metal-arc welding welding procedure in a kind of austenite |
| 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 |
| CN106350741B (en) * | 2016-10-24 | 2017-12-19 | 大连理工大学 | A kind of warm working preparation method of laser assembly solder high-strength steel |
| CN106868425B (en) * | 2017-03-16 | 2018-03-27 | 东北大学 | The post weld heat treatment method of the high tough cut deal welding point low-temperature impact toughness of Mn in a kind of low C of improvement 690MPa levels |
-
2018
- 2018-02-07 CN CN201810121644.4A patent/CN108356417B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108356417A (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1040555C (en) | High tensile strength steel having superior fatigue strength and weldability at welds and method for manufacturing the same | |
| Sun et al. | Effect of pulse frequency on microstructure and properties of welded joints for dual phase steel by pulsed laser welding | |
| CN108025401B (en) | Arc fillet weld and method for manufacturing same | |
| CN109226941B (en) | GMAW (gas metal arc welding) method for low-alloy ultrahigh-strength steel Q1100E thin plate | |
| CN102896466B (en) | Production method of 150-400mm thick steel plate for plastic moulds | |
| JP2007154257A (en) | Tailored blank material for hot press, hot press member and its production method | |
| CN108995323B (en) | High-shear-strength super-thick composite steel plate for third-generation nuclear power station and manufacturing method thereof | |
| CN113652605B (en) | High-toughness steel for automobile wheel, thin-wall automobile wheel and preparation method of steel | |
| Chen et al. | Improving the mechanical properties of PHS laser welded joints by adding Ni foil to suppress δ-ferrite | |
| JP6379819B2 (en) | Lap welding member, lap resistance seam welding method of lap welding member, and lap welding member for automobile having lap welding part | |
| CN108356417B (en) | Heat treatment method for improving plasticity of high-strength-plasticity-product medium manganese steel laser welding joint | |
| CN114131159A (en) | Welding method of ultrahigh-strength steel Q1300E steel plate | |
| JP2007130685A (en) | Method for enhancing fatigue strength of spot welded joint of high-strength steel plate | |
| JP4325503B2 (en) | Steel material with excellent fatigue characteristics and method for producing the same | |
| Zhang et al. | Optimization of double-pulse process in resistance spot welding of hot stamped steel sheet | |
| CN113510340B (en) | Welding and postweld heat treatment process method for martensite precipitation hardening stainless steel material | |
| CN112621107A (en) | Flash welding method for straight seam of high-strength steel wheel rim | |
| CN112008206B (en) | Welding method for quenched and tempered high-strength steel plate | |
| Yaakob et al. | Characterization of heat-treated gas metal arc-welded boron steel sheets | |
| Di et al. | Mirostructure and properties of laser welded joints of dual phase and press-hardened steels | |
| US20220410314A1 (en) | Method for welding coated steel sheets | |
| JP4740275B2 (en) | Common rail manufacturing method and partially reinforced common rail | |
| CN113798640A (en) | Welding method of Q620E high-strength steel | |
| CN108453384B (en) | Method for reducing softening degree of laser welding joint of manganese steel in high strength-elongation product | |
| Xi et al. | The effects of flash allowance and upset allowance on microstructures and mechanical properties of flash butt welded RS590CL steel joints |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |