CN116457480A - 低密度经冷轧和退火的钢板、其生产方法以及这样的钢用于生产车辆部件的用途 - Google Patents
低密度经冷轧和退火的钢板、其生产方法以及这样的钢用于生产车辆部件的用途 Download PDFInfo
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- CN116457480A CN116457480A CN202080107604.XA CN202080107604A CN116457480A CN 116457480 A CN116457480 A CN 116457480A CN 202080107604 A CN202080107604 A CN 202080107604A CN 116457480 A CN116457480 A CN 116457480A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 38
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000000717 retained effect Effects 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 239000011572 manganese Substances 0.000 claims abstract description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000011651 chromium Substances 0.000 claims abstract description 6
- 239000011733 molybdenum Substances 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011777 magnesium Substances 0.000 claims abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 239000010955 niobium Substances 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052796 boron Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 239000011574 phosphorus Substances 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000011575 calcium Substances 0.000 claims abstract 2
- 229910052791 calcium Inorganic materials 0.000 claims abstract 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000000137 annealing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 239000010960 cold rolled steel Substances 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 1
- 238000005554 pickling Methods 0.000 claims 1
- 238000003303 reheating Methods 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- OKTJSMMVPCPJKN-YPZZEJLDSA-N carbon-10 atom Chemical compound [10C] OKTJSMMVPCPJKN-YPZZEJLDSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001887 electron backscatter diffraction Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001912 gas jet deposition Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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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
- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
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- 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
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- 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
- C21D8/0273—Final recrystallisation annealing
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- 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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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
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Abstract
一种低密度经冷轧和退火的钢板,其包含0.12%≤碳≤0.25%、3%≤锰≤10%、3.5%≤铝≤6.5%、0%≤磷≤0.1%、0%≤硫≤0.03%、0%≤氮≤0.1%、0%≤硅≤2%、0.01%≤铌≤0.03%、0.01%≤钛≤0.2%、0%≤钼≤0.5%、0%≤铬≤0.6%、0.01%≤铜≤2.0%、0.01%≤镍≤3.0%、0%≤钙≤0.005%、0%≤硼≤0.01%、0%≤镁≤0.005%、0%≤锆≤0.005%、0%≤铈≤0.1%,以及余量包含铁,所述钢板具有包含以下的显微组织:60%至90%的δ铁素体、8%至30%的平均晶粒尺寸为0.6微米至2微米的残余奥氏体、1.0%至10%的平均晶粒尺寸为0.6微米至2微米的α铁素体和0%至2%的κ析出物(Fe,Mn)3AICx,其中x严格小于1。
Description
本发明涉及低密度钢板,并且特别地涉及双相显微组织。根据本发明的钢板特别良好地适合于制造车辆(例如陆用机动车辆)的内板或外板。
环境限制迫使汽车制造商不断地降低其汽车的CO2排放。要做到这一点,汽车制造商有几种选择,其中他们的主要选择是减轻车辆重量或提高其发动机系统的效率。常常通过将这两种方法组合来实现进步。本发明涉及第一种选择,即减轻机动车辆的重量。在这个非常特定的领域,存在双路线可选方案:
第一路线包括减小钢的厚度,同时提高其机械强度水平。遗憾的是,这种解决方案由于某些汽车部件的刚度的过度降低和出现对乘客造成不舒适条件的声学问题,更不用说与机械强度增加有关的延性的不可避免的损失而具有其局限。
第二路线包括通过使用其他较轻金属对钢进行合金化来降低钢的密度。在这些合金中,低密度合金在可以显著降低重量的同时具有有吸引力的机械特性和物理特性。
特别地,EP3421629是要求保护具有双态(bimodal)显微组织的高强度经冷轧和热处理的钢带、钢板、坯件或热成型产品的专利,其包括以下步骤:生产熔体并将其铸造成具有以下组成的板坯或铸带:0.05重量%至0.50重量%的C;0.50重量%至8.0重量%的Mn;总计0.05重量%至6.0重量%的Al;0.0001重量%至0.05重量%的Sb;0.0005重量%至0.005重量%的∑(Ca+REM);5ppm至100ppm的N;0重量%至2.0重量%的Si;0重量%至0.01重量%的S;0重量%至0.1重量%的P;0重量%至1.0重量%的Cr;0重量%至2.0重量%的Ni;0重量%至2.0重量%的Cu;0重量%至0.5重量%的Mo;0重量%至0.1重量%的V;0ppm至50ppm的B;0重量%至0.10重量%的Ti,其中所述部件具有双态晶粒显微组织,所述双态晶粒显微组织由铁素体基体相和第二相组成,所述铁素体基体相由δ-铁素体和α-铁素体组成,其中δ-铁素体的晶粒尺寸为5μm至20μm,其中α-铁素体的晶粒尺寸为至多3μm,以及所述第二相由晶粒尺寸为至多3μm的贝氏体、马氏体和残余奥氏体中的一者或更多者组成。但是EP3421629的钢没有证明是低密度钢,以及包括诸如马氏体和贝氏体的硬面(hard face)。
因此,本发明的目的是提供这样的钢板:所述钢板呈现出低于7.3的相对密度、至少600MPa的极限抗拉强度和至少17.5%的均匀延伸率。
在一个优选的实施方案中,根据本发明的钢板呈现出等于或低于7.2的相对密度、至少450MPa的屈服强度。
本发明的其他特征和优点将根据本发明的以下详细描述变得明显。
碳含量为0.12重量%至0.25重量%,更优选为0.13重量%至0.2重量%。碳是一种γ相生成元素(Gamagenous element),其在残余奥氏体的形成中起着重要作用,并且还赋予强度和延性。碳含量有利地为0.13%至0.2%,以同时获得高强度、延伸率和拉伸凸缘性。
锰含量以3重量%至10重量%存在。锰在该体系中是一种重要的合金元素,主要是由于用非常大量的锰进行合金化使奥氏体稳定直至室温,这可以有助于达到诸如延伸率和屈服强度的目标特性的事实。锰连同碳一起控制高温下晶界处碳化物的形成,从而控制热脆性。如果锰高于10%存在,则其可能导致中心偏析,这对本发明钢的延性是有害的。当锰低于3%存在时,锰将无法以足够的量使残余奥氏体在室温下稳定。锰存在的优选限度为4%至9%,并且更优选为4%至8%。
铝含量以3.5重量%至6.5重量%存在。向本发明的钢中添加铝有效地降低了钢的密度。铝是一种α相生成元素(alphagenous element)元素,并因此倾向于促进铁素体的形成,并且特别是δ铁素体的形成。铝具有2.7的相对密度,并且对机械特性产生影响。随着铝含量增加,机械强度和弹性极限也增加,但是由于位错迁移率降低导致均匀延伸率降低。低于3.5%,由于铝的存在引起的密度降低变得不太有益。高于6.5%,铁素体的存在增加超过预期限度,并对本发明产生负面影响。此外,高于6.5%的Al的存在可能形成将赋予产品脆性的金属间化合物,例如Fe-Al、Fe3-Al和其它(Fe,Mn)Al金属间化合物,这可能导致钢在冷轧期间开裂,并且还可能对钢的韧性有害。优选地,铝含量将被严格限制为小于6.5%,以防止脆性金属间析出物的形成,因此优选的限度为4%至6%,更优选为5%至6%。
硅是一种任选的元素,其可以降低钢的密度,并在固溶硬化方面有效。然而,硅的含量被限制为2重量%,因为超过该水平,这种元素倾向于形成产生表面缺陷的强粘附氧化物。表面氧化物的存在削弱了钢的可润湿性,并可能在潜在的热浸镀锌操作期间产生缺陷。因此,Si含量将优选地限制为低于1.5%。
硫和磷是使晶界脆化的杂质。它们各自的含量必须不超过0.03重量%和0.1重量%,以便保持足够的热延性。
氮含量必须为0.1重量%或更少,以防止在凝固期间体积缺陷(气泡)的形成和AlN的析出。
铌可以作为任选的元素以0.01重量%至0.03重量%的量添加到本发明的钢中,以提供晶粒细化。晶粒细化允许获得强度与延伸率之间的良好平衡。但是,铌倾向于阻碍在热轧和退火期间的再结晶,并因此限度保持至0.03%。
以与铌相似的方式,钛可以作为任选的元素以0.01重量%至0.2重量%的量添加到本发明的钢中用于晶粒细化。
铜可以作为任选的元素以0.01重量%至2.0重量%的量添加,以提高钢的强度并改善其耐腐蚀性。需要最少0.01%以获得这样的效果。然而,当其含量高于2.0%时,其可能使表面外观劣化。
镍可以作为任选的元素以0.01重量%至3.0重量%的量添加,以提高钢的强度并改善其韧性。需要最少0.01%以获得这样的效果。然而,当其含量高于3.0%时,镍导致延性劣化。
钼为任选的元素,其在本发明的钢中以0重量%至0.5重量%存在;当钼以至少0.01%的量添加时,钼在改善淬透性和硬度方面起有效作用。Mo还有益于热轧产品的韧性,从而导致更容易制造。然而,过量添加钼会增加合金元素的添加成本,因此出于经济原因,其含量被限制为0.5%。钼的优选限度为0%至0.4%,并且更优选为0%至0.3%。
铬为本发明钢中的任选元素,为0重量%至0.6重量%。铬为钢提供强度和硬化,但是当高于0.5%使用时,会损害钢的表面光洁度。铬的优选限度为0.01%至0.5%,并且更优选为0.01%至0.2%。
诸如铈、硼、镁或锆的其他元素可以以下列重量比单独添加或组合添加:Ce≤0.1%,B≤0.01,Ca≤0.005,Mg≤0.005和Zr≤0.005。直至所示的最大含量水平,这些元素使得可以使铁素体晶粒在凝固期间细化。
此外,一些诸如Sb、Sn的微量元素可能来自钢的加工。直至这些元素可被接受且对本发明钢无害的最大限度为累加地或单独0.05重量%,本发明钢的这些元素的含量优选尽可能低,并且优选少于0.03%。
根据本发明的钢板的显微组织以面积分数计包含60%至90%的δ铁素体、1%至10%的α铁素体和8%至30%的残余奥氏体以及任选的0%至2%的κ析出物。
δ铁素体基体作为本发明钢的主相存在,并且在本发明钢中按面积分数计以60%至90%存在,并且优选按面积分数计以65%至90%存在,并且更优选以80%至90%存在。δ铁素体在由铁水凝固成板坯期间形成,并且通常具有粗大的晶粒尺寸。本发明的δ铁素体的平均晶粒尺寸优选小于10μm,并且更优选小于9μm。本发明中δ铁素体基体的存在赋予钢以强度。但是由于随着温度升高,碳在铁素体中的溶解度增加的事实,本发明中存在的δ铁素体含量高于90%可能具有负面影响。然而,固溶体中的碳使低密度钢高度脆化,因为其降低位错迁移率,位错迁移率由于铝的存在已经是低的了。因此δ铁素体含量与奥氏体之间的平衡对于赋予本发明以必需的机械特性是非常重要的。
残余奥氏体在本发明钢中以8%至30%存在,其中本发明的残余奥氏体的平均晶粒尺寸为0.6微米至2微米。残余奥氏体的优选平均晶粒尺寸为0.6微米至1.2微米。已知残余奥氏体的碳溶解度比铁素体更高,并且作为有效的碳捕集器(trap)。奥氏体中的碳百分比以重量计为0.7%至1.5%。以高于30%水平存在的奥氏体通过削弱拉伸凸缘性而对本发明产生负面影响。奥氏体以非常多样的方式而有助于本发明,这取决于退火温度和钢组成的选择,本发明的奥氏体描绘了不同的功能,例如由于TRIP效应而提供可成形性和延性。残余奥氏体的优选限度以面积分数计为9%至29%。
本发明的α-铁素体按面积分数计以1%至10%存在。α铁素体是通过在临界区退火之后和热轧之后的冷却期间奥氏体的部分转变而产生,并且具有0.6微米至1.85微米的平均晶粒尺寸。α-铁素体的优选平均晶粒尺寸为0.6微米至1.2微米。本发明的α铁素体赋予本发明钢以延性和延伸率。α-铁氧体的优选限度按面积分数计为2%至10%。
本发明中的κ析出物定义为其化学计量成分为(Fe,Mn)3AlCx,其中x严格小于1的析出物。κ析出物的面积分数可以达到至多2%。高于2%,延性降低,并且无法获得高于17.5%的均匀延伸率。此外,可能出现不受控制的在铁素体晶界周围的κ析出物,因此增加了热轧和/或冷轧期间的工作。优选地,κ析出物的面积分数应小于1%。
除了上述显微组织之外,低密度经冷轧和退火的钢的显微组织不含诸如珠光体、贝氏体和马氏体的显微组织组分。
根据本发明的钢板可以通过任何合适的制造方法来生产,并且本领域技术人员可以限定一种方法。然而,优选使用根据本发明的方法,该方法包括以下步骤:
根据本发明的钢板优选通过这样的方法来生产:在所述方法中,对由具有上述组成的根据本发明的钢制成的半成品例如板坯、薄板坯或带材进行铸造,将铸造的投入坯料首先冷却至室温,然后再加热到高于1000℃,优选高于1150℃,并且更优选高于1200℃的温度,或者铸造的半成品可以在这样的温度下直接使用,而无需中间冷却。用于本方法的半成品被视为板坯。
然后使经再加热的板坯经历热轧。热轧终轧温度必须高于750℃,并且优选高于770℃。
在热轧之后,必须在低于720℃,并且优选350℃至720℃的温度下对带材进行卷取,并且更优选地在700℃至400℃下进行卷取。
将热轧钢带冷却至室温,然后进行酸洗或者进行任何其他氧化皮去除过程。
然后以30%至90%,优选40%至90%的压下率使热轧钢带经历冷轧。
在冷轧之后,通过以下对冷轧的钢板进行退火:以至少1℃/秒并且优选大于3℃/秒的加热速率将板加热直到840℃至1000℃,并且优选850℃至975℃,并且更优选850℃至925℃的退火温度,将其在这样的退火温度下保持少于1000秒,并且优选少于600秒的时间,并且将其以至少3℃/秒,更优选至少5℃/秒,甚至更优选至少10℃/秒的速率冷却。优选地,连续进行这种退火。
通过控制退火温度和时间,可以在均热期间获得两相组织。
在这样的退火步骤之后,将钢板冷却到室温至480℃的温度,并且可以任选地保持为100℃至480℃以进行过时效1小时或更少,并且优选少于20分钟,并且更优选少于10分钟的时间。此后,可以将其冷却到室温。
在退火之后,可以任选地使钢板经受金属涂覆操作以改善其抗腐蚀保护。所用的涂覆工艺可以是适于本发明钢的任何工艺。可以列举电解或物理气相沉积,其中特别强调喷射气相沉积。金属涂层可以例如基于锌或基于铝。
优选地,基于铝的涂层包含少于15%的Si、少于5.0%的Fe、任选的0.1%至8.0%的Mg和任选的0.1%至30.0%的Zn,剩余部分为A1。
有利地,基于锌的涂层包含0.01%至8.0%的Al、任选的0.2%至8.0%的Mg,剩余部分为Zn。
实施例
本文给出的以下测试、实施例、图形示例和表本质上是非限制性的,并且必须仅出于说明的目的而被考虑,并且将显示本发明的有利特征。
由具有不同组成的钢制成的钢板汇总在表1中,其中对于所有钢,磷的存在总是小于100ppm,其中钢板分别根据如表2中规定的工艺参数来生产。此后,表3汇总了试验期间获得的钢板的显微组织,以及表4汇总了对获得的特性进行评估的结果。
表1-组成
表1示出
试验 | C | Mn | Al | P | S | N | Si |
1 | 0.15 | 4.2 | 5.6 | 0.01 | 0.01 | 0.001 | 0 |
2 | 0.15 | 4.0 | 6.0 | 0.01 | 0.01 | 0.001 | 0 |
3 | 0.15 | 4.1 | 5.95 | 0.01 | 0.001 | 0.001 | 0 |
4 | 0.15 | 4.0 | 6.0 | 0.01 | 0.01 | 0.001 | 0.15 |
5 | 0.15 | 4.0 | 6.0 | 0.01 | 0.01 | 0.001 | 0 |
6 | 0.15 | 4.1 | 6.8 | 0.01 | 0.001 | 0.001 | 0 |
带划线的值:没有根据本发明。
然后分析所得样品,并且相应的显微组织元素和机械特性分别汇总在表3和表4中。
表3汇总了根据标准在不同的显微镜例如EBSD、XRD或任何其他显微镜上进行的用于确定本发明钢和参照试验二者的显微组织组成的测试的结果。使用EBSD测量δ铁素体和α铁素体的面积分数。对于给定的钢样品,对应于1000放大倍数的至少4个图像的EBSD分析允许识别铁素体晶粒、它们的位置和尺寸。晶粒尺寸低于1.85μm的截止值并与奥氏体晶粒相邻的所有晶粒都被视为α铁素体,并确定这样的晶粒的相应面积分数。剩余的铁素体晶粒被计为δ铁素体,并确定这样的晶粒的相应面积分数。还通过使用EBSD测量了δ铁素体、残余奥氏体和α铁素体的平均晶粒尺寸。使用XRD测量残余奥氏体面积分数,其示于表3中。
表3
I=根据本发明;R=参照;带下划线的值:没有根据本发明。
从上表中可以看出,根据本发明的试验全部满足显微组织目标。
表4汇总了本发明钢和参照钢二者的机械特性和表面特性。
表4:试验的机械特性
根据2009年10月出版的ISO标准ISO 6892-1测量屈服强度YS、抗拉强度TS和均匀延伸率UE。
为了确定钢的相对密度,一方面通过气体置换比重瓶测定法使用氦气测量钢样品的体积,以及另一方面测量其相应的质量。然后可以计算出钢的质量/体积比(单位为g/cm3),并进一步除以等于1g/cm3的水在4℃下的质量/体积比。没有单位的结果值为钢的相对密度。
I=根据本发明;R=参照;带下划线的值:没有根据本发明。
这些实施例表明,根据本发明的钢板由于其特定的组成和显微组织是唯一显示出全部目标特性的钢板。
Claims (14)
1.一种低密度经冷轧和退火的钢板,按重量计包含:
0.12%≤碳≤0.25%,
3%≤锰≤10%,
3.5%≤铝≤6.5%,
0%≤磷≤0.1%,
0%≤硫≤0.03%,
0%≤氮≤0.1%,
和任选的以下元素中的一者或更多者:
0%≤硅≤2%,
0.01%≤铌≤0.03%,
0.01%≤钛≤0.2%,
0%≤钼≤0.5%,
0%≤铬≤0.6%,
0.01%≤铜≤2.0%,
0.01%≤镍≤3.0%,
0%≤钙≤0.005%,
0%≤硼≤0.01%,
0%≤镁≤0.005%,
0%≤锆≤0.005%,
0%≤铈≤0.1%,
以及余量包含铁和不可避免的杂质,所述钢板具有以面积分数计包含以下的显微组织:60%至90%的δ铁素体、8%至30%的平均晶粒尺寸为0.6微米至2微米的残余奥氏体、1.0%至10%的平均晶粒尺寸为0.6微米至1.85微米的α铁素体和0%至2%的κ析出物(Fe,Mn)3AlCx,其中x严格小于1。
2.根据权利要求1所述的钢板,其中碳含量为0.13%至0.2%。
3.根据权利要求1或2所述的钢板,其中锰含量为4%至9%。
4.根据权利要求1至3中任一项所述的钢板,其中所述残余奥氏体含量为9%至29%。
5.根据权利要求1至4中任一项所述的钢板,其中所述κ析出物含量为0%至1%。
6.根据权利要求1至5中任一项所述的钢板,其中平均晶粒尺寸为0.6微米至1.2微米的所述α-铁素体含量为2%至10%。
7.根据权利要求1至6中任一项所述的钢板,其中所述钢板被金属涂层覆盖。
8.一种用于生产钢板的方法,包括以下步骤:
-提供组成根据权利要求1至3的板坯,
-将这样的板坯在高于1000℃的温度下再加热,并以至少750℃的终轧温度对所述板坯进行热轧,
-对热轧钢板在低于720℃的温度下进行卷取,
-将所述热轧板冷却;
-对所述热轧钢板进行酸洗;
-对所述热轧钢板以30%至90%的压下率进行冷轧以获得冷轧钢板;
-通过以至少1℃/秒的加热速率将所述钢板从室温加热到840℃至1000℃的退火温度对所述冷轧钢板进行退火,
-然后进行退火少于1000秒的时间,
-然后以至少3℃/秒的冷却速率将所述冷轧钢板冷却到480℃至室温的冷却终止温度,以及任选地将所述冷轧钢板保持为100℃至480℃1秒至200秒的时间,
-此后将所述冷轧钢板冷却到室温以获得低密度经冷轧和退火的钢板。
9.根据权利要求8所述的方法,其中所述退火温度为850℃至975℃。
10.根据权利要求8和9中任一项所述的方法,其中卷取温度为350℃至720℃。
11.根据权利要求8至10中任一项所述的方法,其中所述退火的保持时间少于600秒。
12.根据权利要求8至11中任一项所述的方法,其中所述退火的所述加热速率大于3℃/秒。
13.根据权利要求8至12中任一项所述的方法,还包括最终的涂覆步骤。
14.根据权利要求1至7中任一项所述的钢板或能够根据权利要求8至14中任一项所述的方法获得的钢板用于制造车辆的结构部件或安全部件的用途。
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