CN101400819A - 由轧制的涂覆片材生产具有极高机械性能的零件的方法 - Google Patents
由轧制的涂覆片材生产具有极高机械性能的零件的方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000011701 zinc Substances 0.000 claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000005275 alloying Methods 0.000 claims abstract description 30
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 24
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims description 45
- 238000000576 coating method Methods 0.000 claims description 45
- 239000004411 aluminium Substances 0.000 claims description 35
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 238000002360 preparation method Methods 0.000 claims description 16
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- 239000011572 manganese Substances 0.000 description 11
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- 208000037656 Respiratory Sounds Diseases 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
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- 239000005864 Sulphur Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 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
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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Abstract
本发明涉及由轧制的涂覆片材制造具有极高机械性能的零件的方法。根据本发明,钢零件涂覆有化合物,该化合物在超过其厚度90%上包含至少Fe-Zn基相,该相的铁重量百分含量不小于65%且Fe/Zn比例为1.9-4。通过至少一个使所述钢与预涂层之间合金化的热处理形成前述化合物,所述预涂层由锌合金组成,该锌合金包含0.5-2.5重量%铝和可选的一种或多种选自下面的元素:Pb≤0.003重量%、Sb≤0.003重量%、Bi≤0.003重量%、0.002重量%≤Si≤0.07重量%、La<0.05重量%、Ce<0.05重量%,余量包含锌和不可避免的杂质。
Description
技术领域
本发明涉及热轧或冷轧的涂覆钢零件的制备,所述钢零件表现出高的机械强度和良好的抗腐蚀性。
背景技术
对于一些应用,希望生产出具有高机械强度、良好冲击强度和良好抗腐蚀性的组合的钢零件。在目标是生产显著较轻车辆的汽车工业中这种组合是特别希望的。特别地,这可通过使用由具有极高机械性能、具有马氏体或贝氏体-马氏体显微组织的钢制得的零件获得。机动车辆的防侵入、结构或安全零件,例如挡板横梁、车门或中心柱加强件及轮辐,需要例如上述的品质。
专利FR20004427公开了提供有金属预涂层的轧制钢片材的制备方法,其中该金属预涂层由锌或锌基合金构成,所述钢具有例如约500MPa的抗拉强度。然后切割片材以获得坯料,对该坯料进行热处理以便在表面上形成合金化合物然后对坯料热冲压。之后,该坯料在适于赋予钢材高硬度的条件下进行冷却。通过以初始强度500MPa的钢材开始,能够获得例如机械强度大于1500MPa的零件。从而,在热处理过程中通过预涂层和钢材间的相互扩散而形成的合金化合物提供抵抗腐蚀和脱碳的保护,并且提供了高温润滑作用,这允许增加热拉伸工具的寿命。
与在裸零件(即没有预涂层的零件)上进行的热冲压处理比较,存在的化合物在炉内加热过程中提供抵抗脱碳的保护。也无需随后对零件进行喷丸或喷砂,以除去在炉中通过氧化形成的不规则表面层。
然而,当在需要通过合金化形成的涂层具有特殊性能的某些应用中实施该处理时受到限制:
-热冲压的零件可能包括显著凹陷的区域。倘若基体钢和涂层间的热硬度和流变能力存在差异,可能发生涂层压印到基体钢中的现象,特别是压印到高变形区域中。在对零件施加高机械应力的情况下,希望避免这些作为潜在的缺陷起始区域的压痕;
-在导致钢和预涂层间合金化的热处理过程中,富集铁的Fe-Zn相成核,并且这些成核位置附近的锌发生扩散。这种扩散产生空位,可能导致在微观尺度上产生致密性缺陷。因此寻求最有利的制备条件以减少或消除涂层中的这些致密性缺陷;
-还试图在成形操作过程中使工具磨损最小化,这相对显著地取决于涂层。已经发现具有高粗糙度的涂层对于工具完整性是不利的。因此试图获得减少这种涂层粗糙度的条件;
-当零件可能进行后续的涂覆操作或用作可视零件时,还试图在合金化热处理后获得涂层的规则表面外观。
特别地,目标在于避免在热处理后的表面裂纹外观。涂层中的这种可视缺陷的特征在于被边界分隔的、通常具有几毫米尺寸的单元邻接(juxtaposition)。在任何一个单元中,涂层的厚度是大致恒定的,而在单元边界处,涂层厚度是不规则的。
发明内容
本发明的目的是解决上述问题。特别地,本发明的目的是提供制备预涂覆有锌基合金的热轧或冷轧钢零件的方法,该方法包括合金化处理步骤,在合金化后获得的涂层具有良好的致密性,同时具有高的抗裂纹性以及与令人满意的成形工具寿命有关的粗糙度。还企图提供不导致压痕缺陷的方法。
为此,本发明的一个主题是涂覆有化合物的钢零件,该化合物在超过其厚度90%上由至少一种Fe-Zn基相构成,其Fe重量含量等于65%或更高,其Fe-Zn比例为1.9-4,通过至少一个使钢与预涂层之间合金化的热处理形成该化合物,预涂层是锌基合金,包含(含量以重量表示):0.5-2.5%铝,和可选的一种或多种选自下面的元素:Pb≤0.003%;Sb≤0.003%;Bi≤0.003%;0.002%≤Si≤0.070%;La<0.05%;Ce<0.05%,余量由锌和不可避免的杂质构成。
优选地,预涂层是铝含量不小于0.5重量%但不大于0.7重量%的合金。
根据优选的实施方案,预涂层是铝含量大于0.7重量%但不大于0.8重量%的合金。
还优选地,预涂层是铝含量大于0.8重量%但不大于2.5重量%的合金。
优选地,钢的组成包含(含量以重量表示):0.15%≤C≤0.5%;0.5%≤Mn≤3%;0.1%≤Si≤0.5%;0.01%≤Cr≤1%;Ti≤0.2%;Al≤0.1%;S≤0.05%;P≤0.1%;0.0005%≤B≤0.010%,组成的余量由铁和熔炼导致的不可避免的杂质构成。
根据优选的实施方案,钢组成包含(含量以重量表示):0.15%≤C≤0.25%;0.8%≤Mn≤1.5%;0.1%≤Si≤0.35%;0.01%≤Cr≤0.3%;Ti≤0.1%;Al≤0.1%;S≤0.05%;P≤0.1%;0.002%≤B≤0.005%,组成的余量由铁和熔炼导致的不可避免的杂质构成。
本发明的主题还在于制备涂覆钢零件的方法,该方法包括根据下面的步骤:
-提供热轧或冷轧的钢片材;
-用由锌基合金形成的金属预涂层涂覆该片材,该锌基合金包含(含量以重量表示):0.5-2.5%铝,和可选的一种或多种选自下面的元素:Pb≤0.003%;Sb≤0.003%;Bi≤0.003%;0.002%≤Si≤0.070%;La<0.05%;Ce<0.05%,余量由锌和不可避免的杂质构成,可选进行热预处理,切割片材以获得零件,加热零件以便通过钢与预涂层间的合金化形成合金化的涂层,该涂层在超过其厚度90%上由至少一种Fe-Zn基相构成,该相的Fe重量含量等于65%或更高,且该相的Fe/Zn比例为1.9-4,以便赋予钢部分或完全奥氏体的结构;
-零件进行热变形,并在适于赋予钢零件所需机械性能的条件下对零件进行冷却。
根据优选的实施方案,预涂层是铝含量不小于0.5重量%但不大于0.7重量%的合金。
还优选地,预涂层是铝含量大于0.7重量%但不大于0.8重量%的合金。
优选地,预涂层是铝含量大于0.8重量%但不大于2.5重量%的合金。
根据优选的实施方案,提供了热轧或冷轧的钢片材,该钢片材的组成包含(含量以重量表示):0.15%≤C≤0.5%;0.5%≤Mn≤3%;0.1%≤Si≤0.5%;0.01%≤Cr≤1%;Ti≤0.2%;Al≤0.1%;S≤0.05%;P≤0.1%;0.0005%≤B≤0.010%,组成的余量由铁和熔炼导致不可避免的杂质构成。
还优选地,提供了热轧或冷轧的钢片材,该钢片材的组成包含(含量以重量表示):0.15%≤C≤0.25%;0.8%≤Mn≤1.5%;0.1%≤Si≤0.35%;0.01%≤Cr≤0.3%;Ti≤0.1%;Al≤0.1%;S≤0.05%;P≤0.1%;0.002%≤B≤0.005%,组成的余量由铁和熔炼导致的不可避免的杂质构成。
根据一个特定的实施方案,热预处理包括加热到450-520℃的温度,其均热时间为2-10分钟。
优选地,为了获得合金化并且为了赋予钢部分或完全奥氏体结构,在Ac1和Ac3+100℃之间的温度进行加热,在所述温度下的均热持续时间不少于20秒。
本发明的主题还在于上述零件或根据上述变体之一制备的零件用于制造陆用机动车辆的结构或安全零件的用途。
附图说明
通过下面以举例方式给出的说明并参考下列附图,本发明的其它特征和优点将变得显而易见:
-图1显示了作为锌基预涂层的铝含量函数的表征涂层品质的指标的变化;
-图2是在使用不根据本发明的制备方法涂覆的钢表面上观察到的裂纹的表面视图;
-图3是具有根据本发明的涂层的钢片材横截面的显微组织视图。
与由纯锌获得的预涂层相比,发明人意外发现,当预涂层由含有特定量铝的锌基合金构成时,在使基体钢和预涂层之间合金化的热处理后形成的涂层的品质得到显著改善。图1显示了作为锌基预涂层的铝含量函数的表征涂层品质的指标的变化。该指标考虑到涂层的致密性、粗糙度及抗裂纹性。该指标的等级为0-10(10=非常好的致密性,粗糙度及抗裂纹性;0=非常平庸的性能)。
当预涂层的铝重量含量低于0.5%时,形成的合金化涂层的致密性是平庸的,涂层具有在合金化处理过程中形成的可变尺寸的孔隙。此外,在这些条件下,显示出存在高度发达的裂纹网络。
当铝含量大于2.5%时,由于粗糙度增加,涂层的品质显著下降。
当锌基预涂层的铝含量为0.5-0.7%时,该涂层具有特别是关于粗糙度和抗裂纹性的有利组合。当铝含量大于0.7%而不超过0.8%时,这些性能进一步得到改善。
当锌镀液的铝含量大于0.8而不大于2.5%时,获得致密性、抗磨损性和抗裂纹性的最佳组合。
可通过热浸法、电沉积、真空沉积方法或任何其它方法在基体钢上沉积锌基的预涂层。优选连续进行沉积。除铝外,锌基预涂层可选含有一种或多种下列元素:
-铅、锑和铋,这三种元素每种的重量含量不多于0.003%以避免在热浸涂层情况下的闪烁效应;
-重量含量不小于0.002%的硅,使得能够避免形成过大的FexAly界面层。然而,当硅含量大于0.070%时,在热浸涂层的情况下形成浮渣;
-含量不超过0.05%的镧和铈,有助于表面对于锌镀液的润湿性。
该锌基预涂层也可含有不可避免的杂质,例如镉、锡或铜。当通过热浸方法形成预涂层时,铁和锰可因此特别作为杂质存在。
有利地,在其上沉积预涂层的基体钢具有以重量计的下面组成:
-0.15-0.5重量%、优选0.15-0.25重量%的碳含量。这种元素对于在奥氏体化和合金化处理随后进行的冷却之后获得的淬硬性和机械强度中具有重要作用。然而,含量低于0.15重量%,淬硬性过低且强度性能不足。相反,含量高于0.5重量%,在硬化过程中,特别在最厚零件的情形中,形成缺陷的危险较大。0.15-0.25%的碳含量使得能够获得约1250-1650MPa的强度。
-锰,除其脱氧作用外,对于淬硬性也具有重要作用,特别当其重量含量至少0.5%且优选0.8%时。然而,过大的量(3重量%或优选1.5%)导致过度偏析的危险;
-钢的硅含量必须为0.1-0.5重量%,优选0.1-0.35重量%。除其对液体钢的脱氧作用外,这种元素有助于钢的硬化,但必须限制其含量以避免过量形成氧化物以及促进可涂覆性;
-含量大于0.01%的铬提高淬硬性,且有助于在合金化和奥氏体化热处理后的冷却之后在零件各个部分中,在热成形操作后获得高的强度。含量高于1%(优选0.3%),铬对于获得这种机械性能均匀性的作用饱和;
-铝是促进脱氧和氮析出的元素。在含量大于0.1重量%时,其在制备过程中形成粗的铝酸盐,这使得应限制铝含量到该值;
-过量的硫和磷导致脆性增加。这是为何优选限制它们含量分别为0.05和0.1重量%的原因;
-硼是对淬硬性具有重要作用的元素,其含量必须为0.0005-0.010重量%,且优选0.002-0.005重量%。低于0.0005%的含量,不能获得令人满意的淬硬性效果。对于0.002%的含量获得充分的效果。为了不降低韧性,最大硼含量必须低于0.010%,优选0.005%;
-钛对于氮具有高的亲和力,因此有助于保护硼使得这种元素为游离形式以便发挥其对淬硬性的充分作用。然而高于0.2%,更特别0.1%,存在在液体钢中形成粗的钛氮化物的危险,这对于韧性具有有害影响。
在根据本发明的方法中,提供具有上述组成的热轧或冷轧钢片材,并用具有也在上文所述组成中的锌基合金进行预涂覆。在热处理前或热处理后,切割该片材以获得零件。然后加热该零件以便联合进行下述操作:
-合金化处理以便形成涂层,该涂层在超过其厚度90%上由至少一种Fe-Zn基相构成,该Fe-Zn基相中的Fe重量含量等于65%或更高,且Fe/Zn比例为1.9-4。在合金化反应过程中,钢片材的元素特别是铁、锰和硅扩散到涂层中。预涂层的某些元素特别是锌和铝也发生扩散;
-基体钢的奥氏体化,这种奥氏体化可以是部分的或是完全的。有利地,在炉中进行加热使得零件达到Ac1至Ac3+100℃之间的温度。Ac1和Ac3分别表示奥氏体转变开始和结束的温度。根据本发明,在该温度的均热时间不少于20秒以便使零件各个点的温度均匀。然后对零件进行热成形操作,通过流动应力下的压缩(reduction)来促成该操作,并且随着温度钢的延展性提高。从该部分或完全奥氏体结构开始,然后零件在合适的条件下冷却以便赋予零件所需的机械性能。特别地,可在冷却过程中将零件保留在工具内,可冷却工具本身以促成热量的去除。为了获得高的机械性能,将优选获得马氏体或者贝氏体-马氏体的显微组织。
可选地,可在上述预涂覆步骤后进行热预处理。该热预处理包括加热到450-520℃的温度,持续2-10分钟的时间。在联合的合金化/奥氏体化处理后,该热预处理提高形成的涂层的致密性。还发现该热预处理有助于形成在超过其厚度90%上由两种富铁相构成的涂层,其中铁重量含量等于65%或更高,且Fe/Zn比例为1.9-4。不进行预处理时,涂层趋于由单一、富铁的相构成。不希望束缚于单一理论,认为该预处理改善钢与预涂层间的界面,从而改善在随后的合金化处理过程中发生的扩散现象。
作为实施例,考虑厚度1.3-1.6mm的冷轧钢片材,这些冷轧钢片材具有以重量计的下述组成:
碳:0.22%;
锰:1.3%;
硅:0.30%;
磷 <0.010%;
硫:0.005%;
铬:0.18%;
钛:0.025%;
铝:0.050%;
B:0.003%。
在铝含量至多5%、铅、锑和铋这三种元素量小于0.003%,且铁(作为不可避免的残留元素)量低于0.020%的基于锌的镀液中通过热浸对钢片材进行预涂覆。也通过电沉积来沉积纯锌预涂层。在热浸涂层的情况下,预涂层的厚度约10-20微米,而在电沉积的情况下,厚度约10微米。
在470-520℃对一些片材进行合金化热预处理,持续时间2-10分钟。然后切割这些片材以获得零件。
然后将这些零件加热至930℃(即Ac3+70℃)的温度,并在该温度均热3分钟。包括升温时间和在930℃均热时间的加热时间是10分钟。这些条件导致基体钢的完全奥氏体转变。在该加热和均热阶段,发现通过在基体钢和锌基预涂层间的合金化反应,形成锌基预涂层,该涂层在超过其厚度90%上由一种或多种Fe-Zn相构成,该相的铁重量含量是65%或更高且Fe/Zn比为1.9-4。这种具有高熔点和高硬度的合金化的涂层显示出大的抗腐蚀性,并且在加热阶段过程中或之后阻止下方的基体钢被氧化及脱碳。
在930℃加热阶段后,零件进行5%的热变形。
随后在空气中的冷却导致贝氏体-马氏体结构。在这种处理后获得的机械强度大于750MPa。
然后通过下面技术表征合金化的涂层:
-使用显微照片截面来评价涂层的致密性,并且还用来评价在特定热成形区域中基体钢内存在的任何压痕;
-目视观察及通过粗糙度计进行的测量能够对粗糙度参数Ra进行量化,并且还评价热处理和变形后涂层的裂纹、以及工具的抗磨损性;
-使用以相衬模式的扫描电镜观察,能够确定涂层中存在的相。
这些观察的结果如下:
-在根据本发明的条件下,通过合金化形成的涂层在超过其厚度90%上由富铁的Fe-Zn相构成,该相的铁重量含量等于65%或更高,Fe/Zn比为1.9-4。在通过扫描电镜获得的图3所示的显微照片中,示出了根据本发明的实施例:合金化的涂层在其厚度上主要由两相构成:平均组成为70%Fe-27%Zn-1%Al-0.4%Si的非常浅色的相和包含76%Fe-22%Zn-1%Al-0.5%Si的浅灰色外观的相。可注意到存在较少量锰。硅和锰的存在(当然存在铁)证明在合金化/奥氏体化处理过程中基体金属扩散到预涂层中。还存在一些稀少的残余孔隙(暗色区域)。在试样的最外表面上,可注意到存在较高的锌含量,这增强了腐蚀保护;
-当预涂层中的铝含量低于0.5%时,形成的合金化涂层的致密性是平庸的,涂层具有许多相对发达的孔隙。在这些条件下,也显示出存在非常显著的表面裂纹网络。图2显示了铝含量为0.1%也就是说在本发明条件外的这种裂纹的实例;
-当预涂层中的铝含量大于2.5%时,粗糙度从Ra=1.3微米显著增加到Ra=3微米;
-当锌基预涂层的铝含量为0.5-2.5%时,涂层显示出致密性、低粗糙度及没有裂纹的极好组合。还值得注意的是,在热变形期间,即使在显著凹陷的区域中,涂层也没有压印到基体钢中。此外,当铝含量大于0.7%且优选为0.8%时,对裂纹发生的抵抗性处于其最高水平。
因此,本发明使得能够制备具有高性能的涂覆零件,该金属涂层具有特别有利的致密性、低粗糙度、没有裂纹及抗压印性的组合。零件的最大强度可适于根据钢组成(特别是其碳含量及其锰、铬和硼含量)的期望用途。
这些零件将有利地用于制备安全零件,特别是用于机动车辆构造的抗侵入或结构零件、加强杆和中心柱。
Claims (15)
1.涂覆有化合物的钢零件,该化合物在超过其厚度90%上由至少一种Fe-Zn基相构成,该Fe-Zn基相的铁重量含量等于65%或更高,并且Fe/Zn比例为1.9-4,通过至少一个使所述钢与预涂层之间合金化的热处理形成所述化合物,所述预涂层是锌基合金,该合金包含,含量以重量表示,0.5-2.5%的铝,和可选的一种或多种选自下面的元素:
Pb≤0.003%
Sb≤0.003%
Bi≤0.003%
002%≤Si≤0.070%
La<0.05%
Ce<0.05%,
余量由锌和不可避免的杂质构成。
2.如权利要求1所述的钢零件,特征在于所述预涂层是铝含量不小于0.5%但不大于0.7重量%的合金。
3.如权利要求1所述的钢零件,特征在于所述预涂层是铝含量大于0.7%但不大于0.8重量%的合金。
4.如权利要求1所述的钢零件,特征在于所述预涂层是铝含量大于0.8但不大于2.5重量%的合金。
5.如权利要求1-4中任一项所述的钢零件,特征在于所述钢的组成包含,含量以重量表示:
15%≤C≤0.5%
5%≤Mn≤3%
1%≤Si≤0.5%
01≤Cr≤1%
Ti≤0.2%
A1≤0.1%
S≤0.05%
P≤0.1%
0005%≤B≤0.010%,
组成的余量由铁和熔炼导致的不可避免的杂质构成。
6.如权利要求5所述的钢零件,特征在于所述钢的组成包含,含量以重量表示:
15%≤C≤0.25%
8%≤Mn≤1.5%
1%≤Si≤0.35%
01%≤Cr≤0.3%
Ti≤0.1%
A1≤0.1%
S≤0.05%
P≤0.1%
002%≤B≤0.005%,
组成的余量由铁和熔炼导致的不可避免的杂质构成。
7.制备涂覆钢零件的方法,包括根据下面的步骤:
-提供热轧或冷轧的钢片材;
-用由锌基合金形成的金属预涂层涂覆所述片材,该锌基合金包含,含量以重量表示,0.5-2.5%铝,和可选的一种或多种选自下面的元素:
Pb≤0.003%
Sb≤0.003%
Bi≤0.003%
002%≤Si≤0.070%
La<0.05%
Ce<0.05%,
余量由锌和不可避免的杂质构成;
-可选地进行热预处理;
-切割所述片材以获得零件;
-加热所述零件使得通过所述钢与所述预涂层间的合金化形成合金化的涂层,该涂层在超过其厚度90%上由至少一种Fe-Zn基相构成,该Fe-Zn基相的铁重量含量等于65%或更高,并且Fe/Zn比例为1.9-4,以便赋予所述钢部分或完全奥氏体结构;
-所述零件进行热变形;和
-在适于赋予所述钢零件所需机械性能的条件下冷却所述零件。
8.如权利要求7所述的制备方法,特征在于所述预涂层是铝含量不小于0.5%但不大于0.7重量%的合金。
9.如权利要求7所述的制备方法,特征在于所述预涂层是铝含量大于0.7%但不大于0.8重量%的合金。
10.如权利要求7所述的制备方法,特征在于所述预涂层是铝含量大于0.8但不大于2.5重量%的合金。
11.如权利要求7-10中任一项所述的制备方法,特征在于提供热轧或冷轧的钢片材,该钢片材的组成包含,含量以重量表示:
15%≤C≤0.5%
5%≤Mn≤3%
1%≤Si≤0.5%
01%≤Cr≤1%
Ti≤0.2%
A1≤0.1%
S≤0.05%
P≤0.1%
0005%≤B≤0.010%,
组成的余量由铁和熔炼导致的不可避免的杂质构成。
12.如权利要求11所述的制备方法,特征在于提供热轧或冷轧的钢片材,该钢片材的组成包含,含量以重量表示:
15%≤C≤0.25%
8%≤Mn≤1.5%
1%≤Si≤0.35%
01%≤Cr≤0.3%
Ti≤0.1%
A1≤0.1%
S≤0.05%
P≤0.1%
002%≤B≤0.005%,
组成的余量由铁和熔炼导致的不可避免的杂质构成。
13.如权利要求7-12中任一项所述的制备方法,特征在于所述热预处理包括加热到450-520℃的温度,其均热时间为2-10分钟。
14.如权利要求7-13中任一项所述的制备方法,特征在于为了获得所述合金化以及赋予所述钢部分或完全奥氏体结构,在Ac1至Ac3+100℃的温度下进行所述加热,在所述温度下的均热持续时间不少于20秒。
15.如权利要求1-6所述或者如权利要求7-14中任一项所述制备的零件在制备陆用机动车辆的结构或安全零件中的用途。
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PCT/FR2006/002316 WO2007048895A1 (fr) | 2005-10-27 | 2006-10-12 | Procede de fabrication d'une piece a tres hautes caracteristiques mecaniques a partir d'une tole laminee et revetue |
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Cited By (7)
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CN101985704A (zh) * | 2010-12-02 | 2011-03-16 | 佛山市南海区大沥国东铜材制造有限公司 | 一种高强度锌合金丝及其制备方法 |
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CN103572161A (zh) * | 2013-11-04 | 2014-02-12 | 顾建 | 一种高机械强度零件的材料及制造方法 |
CN105234061A (zh) * | 2014-07-03 | 2016-01-13 | 蒂森克虏伯钢铁欧洲股份公司 | 用于由金属制造型材的方法和装置 |
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JP2009513826A (ja) | 2009-04-02 |
WO2007048895A1 (fr) | 2007-05-03 |
RU2379373C1 (ru) | 2010-01-20 |
EP1943368A1 (fr) | 2008-07-16 |
BRPI0617934B1 (pt) | 2017-12-12 |
MA30003B1 (fr) | 2008-12-01 |
CA2627394A1 (fr) | 2007-05-03 |
KR20080055957A (ko) | 2008-06-19 |
ZA200803591B (en) | 2009-02-25 |
US9611530B2 (en) | 2017-04-04 |
CN104120375A (zh) | 2014-10-29 |
KR100989533B1 (ko) | 2010-10-25 |
BRPI0617934A2 (pt) | 2011-08-09 |
EP1943368B1 (fr) | 2015-12-09 |
US20170166991A1 (en) | 2017-06-15 |
CA2627394C (fr) | 2012-04-17 |
PL1943368T3 (pl) | 2016-06-30 |
JP4814949B2 (ja) | 2011-11-16 |
WO2007048883A1 (fr) | 2007-05-03 |
HUE028437T2 (en) | 2016-12-28 |
ES2561059T3 (es) | 2016-02-24 |
UA87246C2 (ru) | 2009-06-25 |
US20090025836A1 (en) | 2009-01-29 |
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