EP3395978A1 - High manganese steel sheet having excellent vibration-proof property, and manufacturing method therefor - Google Patents
High manganese steel sheet having excellent vibration-proof property, and manufacturing method therefor Download PDFInfo
- Publication number
- EP3395978A1 EP3395978A1 EP16879340.4A EP16879340A EP3395978A1 EP 3395978 A1 EP3395978 A1 EP 3395978A1 EP 16879340 A EP16879340 A EP 16879340A EP 3395978 A1 EP3395978 A1 EP 3395978A1
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- Prior art keywords
- steel sheet
- less
- manufacturing
- damping properties
- heat treatment
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910000617 Mangalloy Inorganic materials 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 19
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 claims description 35
- 238000013016 damping Methods 0.000 claims description 31
- 239000010936 titanium Substances 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 239000010955 niobium Substances 0.000 claims description 16
- 239000011651 chromium Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 15
- 238000005336 cracking Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/08—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C21D2211/008—Martensite
Definitions
- the present disclosure relates to a high Mn steel sheet having excellent damping properties, provided as a steel sheet for a vehicle or construction equipment and used in a location requiring damping properties for noise reduction.
- High Mn damping steel is steel having good damping properties and excellent mechanical properties, since noise energy may be converted to thermal energy due to interface sliding of epsilon martensite when an external impact is applied.
- An aspect of the present disclosure may provide a high Mn steel sheet having excellent damping properties and a method for manufacturing the same.
- a high Mn steel sheet having excellent damping properties, includes: 0 wt% to 0.1 wt% of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less of phosphorus (P), 0.02 wt% or less of sulfur (S), 0.1 wt% or less of nitrogen (N), 0 wt% to 1.0 wt% of titanium (Ti), and iron (Fe) and inevitable impurities, wherein a microstructure contains epsilon martensite and austenite, and an average particle diameter of each of the martensite and the austenite is 2 ⁇ m or less.
- a method for manufacturing a high Mn steel sheet, having excellent damping properties includes: heating a steel sheet, satisfying the composition range described above, to a heat treatment temperature of Ac1°C to Ac3+50°C at a heating rate of 0.01°C/s to 200°C/s; maintaining the steel sheet for 0.01 second to 24 hours at the heat treatment temperature; and cooling the steel sheet to room temperature at a cooling rate of 0.01°C/s or more.
- a high Mn steel sheet having excellent damping properties is provided, and is used for structural components for a vehicle and building materials such as a flooring material, in which a noise reduction is required.
- the present disclosure relates to a high Mn steel sheet having excellent damping properties and a method for manufacturing the same.
- the high Mn steel sheet includes 0 wt% to 0.1 wt% or less of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less (including 0%) of phosphorus (P), 0.02 wt% or less (including 0%) of sulfur (S), 0.1 wt% or less (including 0%) of nitrogen (N), 0 wt% to 1.0 wt% (excluding 0%) of titanium (Ti), and iron (Fe) and inevitable impurities.
- a microstructure of the steel sheet has epsilon martensite and austenite, and an average particle diameter of each of the martensite and the austenite is 2 ⁇ m or less.
- a specific steel composition of the steel sheet according to the present disclosure and the reasons for restricting the steel composition thereof are as follows.
- addition amount of carbon (C) exceeds 0.1%, carbides may be excessively precipitated, and the hot workability and elongation are lowered, and the damping capability may be significantly reduced. Thus, the addition amount of C is limited to 0.1% or less.
- Manganese (Mn) is an element essential for stably securing an austenite structure and is an element for increasing the stacking fault energy. If an addition amount of Mn is less than 8%, martensite, degrading formability, is formed. Thus, strength increases but ductility significantly decreases. Moreover, the stacking fault energy is lowered, so austenite, partially formed, may be easily transformed into epsilon martensite. Thus, a lower limit of Mn is limited to 8%. On the other hand, if the addition amount of Mn exceeds 30%, manufacturing costs may be increased due to a large amount of Mn, and slab cracking may be caused by an increase in an amount of phosphorus (P) in steel.
- P phosphorus
- an upper limit of the addition amount of Mn is limited to 30%.
- Phosphorus (P) and sulfur (S) are inevitably included when steel is produced.
- the content of P is preferably limited to 0.1% or less (including 0%), and the content of S is preferably limited to 0.02% or less (including 0%) .
- P segregation occurs, so the workability of steel may be reduced.
- S coarse manganese sulfide (MnS) is formed, so a defect such as flange cracking may be generated, and the hole expansion of a steel sheet may be reduced.
- an addition amount thereof should be significantly suppressed as much as possible.
- N Nitrogen
- an addition range of N is preferably limited to 0.1% or less (including 0%).
- Titanium (Ti) is a strong carbide forming element, combined with carbon to form a carbide.
- the carbide formed at this time is an element effective in refining a grain size by inhibiting crystal grain growth.
- Ti when Ti is added in combination with boron, a high temperature compound is formed in a columnar-grained boundary to prevent grain boundary cracking from occurring.
- Ti has a scavenging effect in which a fraction of each of C and N is lowered by forming a compound with C and N.
- Ti is an essential element for improving damping capabilities.
- an addition amount of Ti exceeds 1.00%, an excessive amount of Ti may be segregated in a crystal grain boundary and grain boundary embrittlement may be caused, or a precipitation phase may be excessively coarse. Thus, a grain growth effect may be lowered. Therefore, the addition amount of Ti is limited to being 1.0% or less.
- the high Mn steel sheet according to another aspect to the present disclosure additionally includes one, two, or more among 0 wt% to 3 wt% of silicon (Si), 0.005 wt% to 5.0 wt% of chromium (Cr), 0.005 wt% to 2.0 wt% of nickel (Ni), 0.005 wt% to 0.5 wt% of niobium (Nb), 0.0001 wt% to 0.01 wt% of boron (B), 0.005 wt% to 0.5 wt% of vanadium (V), and 0.005 wt% to 1 wt% of tungsten (W).
- Si silicon
- Cr chromium
- Ni nickel
- Nb niobium
- B boron
- B 0.005 wt% to 0.5 wt% of vanadium
- W 0.005 wt% to 1 wt% of tungsten
- Silicon (Si) is a solid solution strengthening element, and is an element for increasing yield strength by reducing a grain size by a solid solution effect. Thus, Si is necessary to secure strength.
- Si is necessary to secure strength.
- an addition amount of Si is increased, during hot rolling, silicon oxide is formed on a surface of a steel sheet. Thus, pickling properties are deteriorated, so surface qualities of a steel sheet may be deteriorated, as a disadvantage.
- due to addition of a large amount of Si the weldability of steel may be significantly lowered.
- an upper limit of the addition amount of Si may be limited to 3%.
- Chromium (Cr) reacts with external oxygen during a hot rolling or annealing operation, and a Cr-based oxide film (Cr 2 O 3 ) having a thickness of 20 ⁇ m to 50 ⁇ m is preferentially formed on a surface of a steel sheet, so Mn and Si, contained in the steel, are prevented from being eluted into a surface layer.
- Cr may act as an element for contributing to stabilization of a structure of a surface layer and improving plating surface properties.
- an upper limit of the content of Cr may be limited to 5.0%.
- Nickel (Ni) contributes to the stabilization of the austenite, which is not only advantageous for improving the elongation but also contributing effectively to the high temperature ductility. If the content of Ni, a strong high temperature toughness improving element, is less than 0.005%, an effect on high temperature toughness is insignificant. If an added content of Ni increases, Ni has a significant effect on prevention of delayed fracture and slab cracking. However, material costs may be high, so production costs may be increased. Thus, the content of Ni may be limited to 0.005% to 2.0%.
- Niobium is a carbide forming element for forming carbide by being combined with carbon in the steel.
- Nb may be added for the purpose of increasing the strength and refining the grain size.
- Nb forms a precipitate at a lower temperature as compared to Ti, so Nb is an element having significant effects of refining a crystal grain size and strengthening precipitation by formation of a precipitate.
- Nb may be added in an amount of 0.005% to 0.5%. However, if an addition amount of Nb is less than 0.005%, the effect described above is insignificant.
- Nb is added in an amount exceeding 0.5%, an excessive amount of Nb is segregated in a grain boundary, thereby causing grain boundary embrittlement, or a precipitate may be excessively coarse, thereby lowering a growth effect of a crystal grain. Moreover, in a hot rolling process, recrystallization is delayed, so rolling load may be increased. Thus, the addition amount of Nb may be limited to 0.005% to 0.5%.
- Vanadium (V) and tungsten (W) are elements for forming carbonitride by being combined with C and N together with Ti.
- V and W may be important elements for securing austenite.
- V is added in an amount exceeding 0.5%
- W is added in an amount exceeding 1.0%
- a precipitate is excessively coarse, so a grain growth effect may be lowered, which may cause hot brittleness.
- the addition amount of V may be limited to 0.005% to 0.5%
- the addition amount of W may be limited to 0.005% to 1%.
- B Boron
- B Boron
- a high-temperature compound is formed in a grain boundary, so grain boundary cracking may be prevented.
- B is added in a small amount of 0.0001% or less, there may be no effect.
- B is added in an amount of 0.01%, a boron compound is formed, so surface properties may be deteriorated.
- a range of B may be limited to 0.0001% to 0.01%.
- steel which has the composition and composition range, and in which a microstructure is comprised of a austenite as main phase, is heated at a heating rate of 0.01°C/s to 200°C/s, and maintained at a heat treatment temperature of Ac1°C to Ac3+50°C for 0.01 second to 24 hours, and is then cooled to room temperature at a cooling rate of 0.01°C/s or more.
- the high Mn steel sheet may be a cold rolled steel sheet or a hot rolled steel sheet.
- a microstructure of the high Mn steel sheet has epsilon martensite and austenite.
- the heat treatment is performed at a temperature less than Ac1, transformation does not proceed, so there may be a problem in which a heat treatment effect can not be obtained. If a heat treatment temperature exceeds Ac3+50°C, there may be a problem in which an average particle diameter of a microstructure exceeds 2 ⁇ m. Thus, the heat treatment temperature is limited to Ac1°C to Ac3+50°C.
- the heat treatment time is less than 0.01 second, the application of recrystallization and recovery is insignificant, so an effect of heat treatment may be not obtained. If the heat treatment time exceeds 24 hours, there may be a problem in a process in which excessive oxidation occurs, so base iron is removed, and excessive heat treatment costs are consumed, as well as a problem in a microstructure in which a microstructure significantly grows, so an average particle diameter thereof is greater than a target particle diameter.
- cooling is performed at a cooling rate less than 0.01°C/s, there may be problems in which an average particle diameter of a microstructure is increased during the cooling, and coarse carbides are generated due to phase instability.
- a lower limit of a cooling rate is limited to 0.01°C/s.
- a cold rolled steel sheet including 0.02 wt% of C, 17 wt% of Mn, 0.01 wt% of N, 0.008 wt% of P, 0.008 wt% of S, 0.03 wt% of Ti, and Fe and inevitable impurities, was heated at a heating rate of 5°C/s, and was then maintained for the heat treatment time at a heat treatment temperature illustrated in Table 1. Then, the heat treated steel sheet was cooled to room temperature at a cooling rate of 5°C/s.
- the Example, heat treated at 600°C is compared with the Comparative Examples (1 to 4), heat treated at 700°C to 1000°C.
- Comparative Example (1) in which a heat treatment temperature was 700°C, the area fraction of epsilon martensite was lower, and a particle diameter was greater, as compared to the Example, heat treated at 600°C.
- an average particle diameter of a microstructure was 2 ⁇ m or less.
- FIG. 2 is a drawing illustrating a dilatometer cycle of heat treatment illustrated in FIG. 1 .
- SDC indicates the damping capacity (a property in which an object absorbs vibrations).
- a room temperature SDC value of damping steel having a microstructure according to the Example, heat treated at 600°C is a value 2.5 times that of damping steel according to Comparative Example (4).
- a SDC value of Example, heat treated at 600°C is 0.00025
- a SDC value of Comparative Example (4), heat treated at 1000°C was measured as 0.0001.
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Abstract
Description
- The present disclosure relates to a high Mn steel sheet having excellent damping properties, provided as a steel sheet for a vehicle or construction equipment and used in a location requiring damping properties for noise reduction.
- In recent years, noise reduction in vehicle manufacturing and building materials is a problem which manufacturers have needed to solve. In the case of vehicle manufacturers, it is particularly necessary to have damping properties in addition to excellent mechanical properties in components such as engine parts, oil pans, and the like, in which a significant noise is generated. In the case of building materials, recently, due to the strengthening of regulations relating to noise between floors, the development of a damping steel sheet as a floor plate of a duplex building including an apartment building is required.
- High Mn damping steel is steel having good damping properties and excellent mechanical properties, since noise energy may be converted to thermal energy due to interface sliding of epsilon martensite when an external impact is applied.
- An aspect of the present disclosure may provide a high Mn steel sheet having excellent damping properties and a method for manufacturing the same.
- According to an aspect of the present disclosure, a high Mn steel sheet, having excellent damping properties, includes: 0 wt% to 0.1 wt% of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less of phosphorus (P), 0.02 wt% or less of sulfur (S), 0.1 wt% or less of nitrogen (N), 0 wt% to 1.0 wt% of titanium (Ti), and iron (Fe) and inevitable impurities, wherein a microstructure contains epsilon martensite and austenite, and an average particle diameter of each of the martensite and the austenite is 2 µm or less.
- According to another aspect of the present disclosure, a method for manufacturing a high Mn steel sheet, having excellent damping properties, includes: heating a steel sheet, satisfying the composition range described above, to a heat treatment temperature of Ac1°C to Ac3+50°C at a heating rate of 0.01°C/s to 200°C/s; maintaining the steel sheet for 0.01 second to 24 hours at the heat treatment temperature; and cooling the steel sheet to room temperature at a cooling rate of 0.01°C/s or more.
- According to an exemplary embodiment in the present disclosure, a high Mn steel sheet having excellent damping properties is provided, and is used for structural components for a vehicle and building materials such as a flooring material, in which a noise reduction is required.
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FIG. 1 is a view illustrating the microstructures of the Example heat treated at 600°C and the Comparative Example heat treated at 700°C to 1000°C. -
FIG. 2 is a drawing illustrating a dilatometer cycle of the heat treatment illustrated inFIG. 1 . -
FIG. 3 is a graph illustrating the results of specific damping capacity (SDC) measured by the internal resistance method with respect to the Example and the Comparative Example (4) . - Hereinafter, the present disclosure will be described in detail.
- The present disclosure relates to a high Mn steel sheet having excellent damping properties and a method for manufacturing the same. The high Mn steel sheet includes 0 wt% to 0.1 wt% or less of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less (including 0%) of phosphorus (P), 0.02 wt% or less (including 0%) of sulfur (S), 0.1 wt% or less (including 0%) of nitrogen (N), 0 wt% to 1.0 wt% (excluding 0%) of titanium (Ti), and iron (Fe) and inevitable impurities. A microstructure of the steel sheet has epsilon martensite and austenite, and an average particle diameter of each of the martensite and the austenite is 2 µm or less.
- A specific steel composition of the steel sheet according to the present disclosure and the reasons for restricting the steel composition thereof are as follows.
- If the addition amount of carbon (C) exceeds 0.1%, carbides may be excessively precipitated, and the hot workability and elongation are lowered, and the damping capability may be significantly reduced. Thus, the addition amount of C is limited to 0.1% or less.
- Manganese (Mn) is an element essential for stably securing an austenite structure and is an element for increasing the stacking fault energy. If an addition amount of Mn is less than 8%, martensite, degrading formability, is formed. Thus, strength increases but ductility significantly decreases. Moreover, the stacking fault energy is lowered, so austenite, partially formed, may be easily transformed into epsilon martensite. Thus, a lower limit of Mn is limited to 8%. On the other hand, if the addition amount of Mn exceeds 30%, manufacturing costs may be increased due to a large amount of Mn, and slab cracking may be caused by an increase in an amount of phosphorus (P) in steel. Moreover, as the addition amount of Mn increases, internal grain boundary oxidation significantly occurs when a slab is reheated. Thus, an oxide defect on a surface of a steel sheet is caused. Moreover, surface properties are degraded in hot dip galvanizing. Thus, an upper limit of the addition amount of Mn is limited to 30%.
- Phosphorus (P) and sulfur (S) are inevitably included when steel is produced. The content of P is preferably limited to 0.1% or less (including 0%), and the content of S is preferably limited to 0.02% or less (including 0%) . In detail, in the case of P, segregation occurs, so the workability of steel may be reduced. In the case of S, coarse manganese sulfide (MnS) is formed, so a defect such as flange cracking may be generated, and the hole expansion of a steel sheet may be reduced. Thus, an addition amount thereof should be significantly suppressed as much as possible.
- Nitrogen (N) is an element, inevitably contained during the production, so an addition range of N is preferably limited to 0.1% or less (including 0%).
- Titanium (Ti) is a strong carbide forming element, combined with carbon to form a carbide. The carbide formed at this time is an element effective in refining a grain size by inhibiting crystal grain growth. Moreover, when Ti is added in combination with boron, a high temperature compound is formed in a columnar-grained boundary to prevent grain boundary cracking from occurring. In addition, Ti has a scavenging effect in which a fraction of each of C and N is lowered by forming a compound with C and N. Thus, Ti is an essential element for improving damping capabilities. However, if an addition amount of Ti exceeds 1.00%, an excessive amount of Ti may be segregated in a crystal grain boundary and grain boundary embrittlement may be caused, or a precipitation phase may be excessively coarse. Thus, a grain growth effect may be lowered. Therefore, the addition amount of Ti is limited to being 1.0% or less.
- The high Mn steel sheet according to another aspect to the present disclosure additionally includes one, two, or more among 0 wt% to 3 wt% of silicon (Si), 0.005 wt% to 5.0 wt% of chromium (Cr), 0.005 wt% to 2.0 wt% of nickel (Ni), 0.005 wt% to 0.5 wt% of niobium (Nb), 0.0001 wt% to 0.01 wt% of boron (B), 0.005 wt% to 0.5 wt% of vanadium (V), and 0.005 wt% to 1 wt% of tungsten (W).
- Silicon (Si) is a solid solution strengthening element, and is an element for increasing yield strength by reducing a grain size by a solid solution effect. Thus, Si is necessary to secure strength. However, if an addition amount of Si is increased, during hot rolling, silicon oxide is formed on a surface of a steel sheet. Thus, pickling properties are deteriorated, so surface qualities of a steel sheet may be deteriorated, as a disadvantage. Moreover, due to addition of a large amount of Si, the weldability of steel may be significantly lowered. Thus, an upper limit of the addition amount of Si may be limited to 3%.
- Chromium (Cr) reacts with external oxygen during a hot rolling or annealing operation, and a Cr-based oxide film (Cr2O3) having a thickness of 20 µm to 50 µm is preferentially formed on a surface of a steel sheet, so Mn and Si, contained in the steel, are prevented from being eluted into a surface layer. Thus, Cr may act as an element for contributing to stabilization of a structure of a surface layer and improving plating surface properties.
- However, if Cr is included in an amount less than 0.005%, the effect described above is insignificant. If Cr is included in an amount exceeding 5.0%, chromium carbide is formed, so workability and delayed fracture properties are deteriorated. Thus, an upper limit of the content of Cr may be limited to 5.0%.
- Nickel (Ni) contributes to the stabilization of the austenite, which is not only advantageous for improving the elongation but also contributing effectively to the high temperature ductility. If the content of Ni, a strong high temperature toughness improving element, is less than 0.005%, an effect on high temperature toughness is insignificant. If an added content of Ni increases, Ni has a significant effect on prevention of delayed fracture and slab cracking. However, material costs may be high, so production costs may be increased. Thus, the content of Ni may be limited to 0.005% to 2.0%.
- Niobium (Nb) is a carbide forming element for forming carbide by being combined with carbon in the steel. In the present disclosure, Nb may be added for the purpose of increasing the strength and refining the grain size. According to the related art, Nb forms a precipitate at a lower temperature as compared to Ti, so Nb is an element having significant effects of refining a crystal grain size and strengthening precipitation by formation of a precipitate. Thus, Nb may be added in an amount of 0.005% to 0.5%. However, if an addition amount of Nb is less than 0.005%, the effect described above is insignificant. On the other hand, if Nb is added in an amount exceeding 0.5%, an excessive amount of Nb is segregated in a grain boundary, thereby causing grain boundary embrittlement, or a precipitate may be excessively coarse, thereby lowering a growth effect of a crystal grain. Moreover, in a hot rolling process, recrystallization is delayed, so rolling load may be increased. Thus, the addition amount of Nb may be limited to 0.005% to 0.5%.
- Vanadium (V) and tungsten (W) are elements for forming carbonitride by being combined with C and N together with Ti. In the present disclosure, since a fine precipitate is formed at a low temperature, a precipitation strengthening effect may be obtained. Moreover, V and W may be important elements for securing austenite. However, if two elements are added in small amounts, less than 0.005%, the effect described above is insignificant. On the other hand, if V is added in an amount exceeding 0.5% and W is added in an amount exceeding 1.0%, a precipitate is excessively coarse, so a grain growth effect may be lowered, which may cause hot brittleness. Thus, the addition amount of V may be limited to 0.005% to 0.5%, while the addition amount of W may be limited to 0.005% to 1%.
- Boron (B) is added with Ti, and thus a high-temperature compound is formed in a grain boundary, so grain boundary cracking may be prevented. However, if B is added in a small amount of 0.0001% or less, there may be no effect. If B is added in an amount of 0.01%, a boron compound is formed, so surface properties may be deteriorated. Thus, a range of B may be limited to 0.0001% to 0.01%.
- Hereinafter, a method for manufacturing a high Mn steel sheet having excellent damping properties will be described.
- In the method for manufacturing a high Mn steel sheet according to the present disclosure, steel, which has the composition and composition range, and in which a microstructure is comprised of a austenite as main phase, is heated at a heating rate of 0.01°C/s to 200°C/s, and maintained at a heat treatment temperature of Ac1°C to Ac3+50°C for 0.01 second to 24 hours, and is then cooled to room temperature at a cooling rate of 0.01°C/s or more.
- The high Mn steel sheet may be a cold rolled steel sheet or a hot rolled steel sheet.
- A microstructure of the high Mn steel sheet has epsilon martensite and austenite.
- In the heating, if a heating rate exceeds 200°C/s, Ac1 and Ac3 temperatures are raised. Thus, even when heat treatment is performed in the range of the present disclosure, there is a problem in which an average particle diameter of a microstructure exceeds 2 µm. Therefore, an upper limit of a heating rate is limited to 200°C/s. If the heating rate is 0.01°C/s or less, during an operation, coarse carbides may be generated due to phase instability. Therefore, the heat treatment should be performed at a rate of 0.01°C/s or more.
- If the heat treatment is performed at a temperature less than Ac1, transformation does not proceed, so there may be a problem in which a heat treatment effect can not be obtained. If a heat treatment temperature exceeds Ac3+50°C, there may be a problem in which an average particle diameter of a microstructure exceeds 2 µm. Thus, the heat treatment temperature is limited to Ac1°C to Ac3+50°C.
- If the heat treatment time is less than 0.01 second, the application of recrystallization and recovery is insignificant, so an effect of heat treatment may be not obtained. If the heat treatment time exceeds 24 hours, there may be a problem in a process in which excessive oxidation occurs, so base iron is removed, and excessive heat treatment costs are consumed, as well as a problem in a microstructure in which a microstructure significantly grows, so an average particle diameter thereof is greater than a target particle diameter.
- If the cooling is performed at a cooling rate less than 0.01°C/s, there may be problems in which an average particle diameter of a microstructure is increased during the cooling, and coarse carbides are generated due to phase instability. Thus, a lower limit of a cooling rate is limited to 0.01°C/s. There is no upper limit of a cooling rate. As the cooling rate is increased, it may be more advantageous to secure epsilon martensite and secure a fine average particle size.
- Hereinafter, an Example of the present disclosure will be described in detail. The following example is for the purpose of understanding the present disclosure and is not intended to limit the present disclosure.
- A cold rolled steel sheet, including 0.02 wt% of C, 17 wt% of Mn, 0.01 wt% of N, 0.008 wt% of P, 0.008 wt% of S, 0.03 wt% of Ti, and Fe and inevitable impurities, was heated at a heating rate of 5°C/s, and was then maintained for the heat treatment time at a heat treatment temperature illustrated in Table 1. Then, the heat treated steel sheet was cooled to room temperature at a cooling rate of 5°C/s.
- Regarding the steel sheet, having been heat-treated and cooled, an average particle diameter of a microstructure and the fraction of epsilon martensite were investigated, and a result thereof is illustrated in Table 1 and
FIG. 1 .[Table 1] Classification Heat Treatment Temperature (°C) Heat Treatment Temperature (min) Particle Diameter (µm) Area Fraction (%) of Epsilon Martensite Example 600 30 1.23 6.2 Comparative Example 1 700 30 2.3 3 Comparative Example 2 800 30 3.6 14.9 Comparative Example 3 900 10 6.7 16.8 Comparative Example 4 1000 30 6.7 34.6 - As disclosed in Table 1 and
FIG. 1 , the Example, heat treated at 600°C, is compared with the Comparative Examples (1 to 4), heat treated at 700°C to 1000°C. In Comparative Example (1), in which a heat treatment temperature was 700°C, the area fraction of epsilon martensite was lower, and a particle diameter was greater, as compared to the Example, heat treated at 600°C. - Moreover, in the case of Comparative Examples (2 to 4) in which heat treatment temperatures were 800°C, 900°C, and 1000°C, respectively, the area fraction of epsilon martensite was greater, as compared to the Example, heat treated at 600°C. However, a particle diameter of the Example, heat treated at 600°C, was smaller than a particle diameter of the Comparative Examples (2 to 4), heat treated at 700°C to 1000°C.
- Meanwhile, in the case of Example, heat treated at 600°C according to the present disclosure, an average particle diameter of a microstructure was 2 µm or less.
-
FIG. 2 is a drawing illustrating a dilatometer cycle of heat treatment illustrated inFIG. 1 . - In
FIG. 2 , Ac1 and Ac3 are confirmed, and the Example is a result in which a heat treatment was performed at Ac3 + 30°C. - In
FIG. 3 , the Example, heat treated at 600°C, and Comparative Example (4), heat treated at 1000°C, were measured using a friction coefficient method. A result of measuring Specific Damping Capacity (SDC) is illustrated therein. - Here, SDC indicates the damping capacity (a property in which an object absorbs vibrations).
- Referring to
FIGS. 1 and3 , a room temperature SDC value of damping steel having a microstructure according to the Example, heat treated at 600°C, is a value 2.5 times that of damping steel according to Comparative Example (4). In other words, a SDC value of Example, heat treated at 600°C, is 0.00025, and a SDC value of Comparative Example (4), heat treated at 1000°C, was measured as 0.0001. - The area fraction of epsilon martensite of the Example, heat treated at 600°C, was relatively low. However, a particle diameter thereof was small, so a structure may be finely and uniformly distributed. In this case, when a steel sheet, in which residual dislocation and an interface together with epsilon martensite are present, was affected by an external shock, a rate of conversion from energy to thermal energy was increased. Thus, damping capacity is improved, so damping properties may be excellent.
- According to the related art, when a room temperature SDC value is 0.00015 or more, damping properties are excellent.
- Through comprehensive results, when heat treatment is performed according to the present disclosure, an average particle diameter of 2 µm or less is secured. Thus, it can be seen that excellent damping properties may be secured.
- In the case of the Comparative Examples, except for a Comparative Example heat treated at 700°C, the area fraction of epsilon martensite is high, as compared to the Example. On the other hand, an average particle diameter of a microstructure is great. Thus, the damping performance is inferior.
- While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.
Claims (6)
- A high Mn steel sheet having excellent damping properties, comprising0.1 wt% or less of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less of phosphorus (P), 0.02 wt% or less of sulfur (S), 0.1 wt% or less of nitrogen (N), 0 wt% to 1.0 wt% of titanium (Ti), and iron (Fe) and inevitable impurities,wherein a microstructure contains epsilon martensite and austenite, and an average particle diameter of each of the martensite and the austenite is 2 µm or less.
- The high Mn steel sheet having excellent damping properties of claim 1, wherein the steel sheet additionally comprises one, two, or more among 0 wt% to 3 wt% of silicon (Si), 0.005 wt% to 5.0 wt% of chromium (Cr), 0.005 wt% to 2.0 wt% of nickel (Ni), 0.005 wt% to 0.5 wt% of niobium (Nb), 0.0001 wt% to 0.01 wt% of boron (B), 0.005 wt% to 0.5 wt% of vanadium (V), and 0.005 wt% to 1 wt% of tungsten (W).
- The high Mn steel sheet having excellent damping properties of claim 1, wherein a room temperature specific damping capacity (SDC) value of the steel sheet is 0.00015 or more.
- A method for manufacturing a high Mn steel sheet having excellent damping properties, comprising:heating a high Mn steel sheet, including 0 wt% to 0.1 wt% or less of carbon (C), 8 wt% to 30 wt% of manganese (Mn), 0.1 wt% or less of phosphorus (P), 0.02 wt% or less of sulfur (S), 0.1 wt% or less of nitrogen (N), 0 wt% to 1.0 wt% of titanium (Ti), and iron (Fe) and inevitable impurities to a heat treatment temperature of Ac1°C to Ac3+50°C at a heating rate of 0.01°C/s to 200°C/s;maintaining the high Mn steel sheet for 0.01 second to 24 hours at the heat treatment temperature; andcooling the high Mn steel sheet to room temperature at a cooling rate of 0.01°C/s or more.
- The method for manufacturing high Mn steel sheet having excellent damping properties of claim 4, wherein a microstructure of the high Mn steel sheet has epsilon martensite and austenite.
- The method for manufacturing high Mn steel sheet having excellent damping properties of claim 4, wherein the steel sheet additionally comprises one, two, or more among 0 wt% to 3 wt% of silicon (Si), 0.005 wt% to 5.0 wt% of chromium (Cr), 0.005 wt% to 2.0 wt% of nickel (Ni), 0.005 wt% to 0.5 wt% of niobium (Nb), 0.0001 wt% to 0.01 wt% of boron (B), 0.005 wt% to 0.5 wt% of vanadium (V), and 0.005 wt% to 1 wt% of tungsten (W).
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PCT/KR2016/015040 WO2017111473A1 (en) | 2015-12-23 | 2016-12-21 | High manganese steel sheet having excellent vibration-proof property, and manufacturing method therefor |
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CN107794357B (en) * | 2017-10-26 | 2018-09-14 | 北京科技大学 | The method of super rapid heating technique productions superhigh intensity martensite cold-rolled steel sheet |
KR102098501B1 (en) | 2018-10-18 | 2020-04-07 | 주식회사 포스코 | High-manganese steel having excellent vibration-proof properties and formability, and method for manufacturing thereof |
CN112899577B (en) * | 2021-01-18 | 2021-12-24 | 北京科技大学 | Preparation method of Fe-Mn series high-strength high-damping alloy |
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CN114774800A (en) * | 2022-04-19 | 2022-07-22 | 河南科技大学 | Ultrahigh-strength and high-ductility and toughness martensitic steel and preparation method thereof |
CN114774800B (en) * | 2022-04-19 | 2023-08-08 | 河南科技大学 | Ultrahigh-strength high-plasticity and toughness martensitic steel and preparation method thereof |
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JP2019504208A (en) | 2019-02-14 |
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