CN114787412B - 用于制造预涂覆钢板的方法及用于制造钢部件的方法 - Google Patents
用于制造预涂覆钢板的方法及用于制造钢部件的方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 27
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- 239000011701 zinc Substances 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 7
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Abstract
本发明主要涉及一种预涂覆钢板,其中,所述预涂覆钢板(1、1’)的相反面(6a、6b)中的至少一个面(6a;6b)的周缘(7)处的至少一个区域涂覆有附加涂层(8),该附加涂层被选择成用于将激光焊接方法期间预涂层(2)与所述附加涂层(8)之间的蒸气压力增加至预涂层(2)从焊缝(14)喷出的临界压力。优选地,附加涂层(8)的蒸发温度高于预涂层(2)的蒸发温度,并且该附加涂层包含γ相形成元素、如碳和/或镍。本发明还涉及一种通过对如上所述的至少第一预涂覆钢板和第二预涂覆钢板(1、1’)进行激光焊接、优选地进行对接激光焊接而获得的钢部件。
Description
本发明主要涉及预涂覆钢板,该预涂覆钢板包括用于增加由所述预涂覆钢板制备的焊接钢部件的焊接金属区的机械强度的附加涂层。
本发明还涉及用于制造所述预涂覆钢板的方法。
本发明还涉及通过对至少第一预涂覆钢板和至少第二预涂覆钢板进行激光焊接而获得的钢部件,第一预涂覆钢板和第二预涂覆钢板包括用于增加焊接钢部件的焊接金属区的机械强度的附加涂层。
本发明最后涉及用于制造所述钢部件的方法。
现有技术公开了由彼此连续地对接焊接的、具有不同的组成和/或厚度的钢坯件制造焊接钢部件的方法。在第一种已知的制造模式中,这些焊接坯件是冷成型的。在第二种已知的制造模式中,这些焊接坯件被加热至能够使钢奥氏体化的温度并且然后在成型模具中被热成型并快速冷却。本发明涉及第二种制造模式。
钢的组成可以被选择成使得可以进行后续的加热和成型操作并且赋予焊接钢部件高机械强度、高冲击强度和良好的耐腐蚀性。
近年来,含硼压制硬化钢(PHS)由于在压制硬化条件下优异的极限拉伸强度(1500MPa至2000MPa)而受到汽车制造商的关注。由于压制硬化钢的高比强度以及压制硬化钢在部件设计中的高灵活性,其被广泛用于汽车防撞部件比如B柱、A柱和门环。通常,压制硬化钢在原始状态下包括铁素体-珠光体结构,然后当在高温下被奥氏体化时转变为完全马氏体结构,并且随后在压制硬化期间用水冷模具以约30℃/s的临界冷却速率冷却至环境温度。压制硬化钢越来越多地被汽车工业采用,其具有各种形式的耐腐蚀合金涂层比如Al-Si涂层、Zn涂层和Zn-Ni涂层;其中,Al-Si涂层具有较好的耐腐蚀和高温抗氧化能力。
一种用于制造焊接钢部件的已知方法,该方法包括:购买如公开文本EP 971044中所描述的至少两个钢板、对这两个板材进行对接焊接以获得焊接坯件、可选地切割该焊接坯件、然后在进行热成型操作之前加热该焊接坯件以赋予钢部件用于其应用所需的形状。
一种已知的焊接技术是激光光束焊接。与其他焊接技术比如缝焊或弧焊相比,该技术在灵活性、质量和生产率方面具有优势。
然而,在焊接操作期间,包括金属间合金层的铝基预涂层被焊接金属区内的钢基材稀释,该金属间合金层与钢基材接触、顶部是金属合金层,该焊接金属区是在焊接操作期间处于熔融状态并且在该焊接操作之后固化的区,从而在两个板材之间形成结合部。
在预涂层的铝含量范围内,作为基体中的固溶体中的α相元素的铝阻止了在冲压之前的步骤期间发生的向奥氏体的转变。因此,在热成型之后的冷却期间不再可能获得马氏体,并且焊缝含有铁素体。然后,焊接金属区呈现出低于两个相邻的板材的硬度和机械强度的硬度和机械强度,这可能导致焊接区中最终部件的严重失效。
上述热冲压钢的Al基涂层的不利的相互作用和激光焊接操作与第三代Zn基预涂覆冷冲压钢的激光焊接所带来的问题之间存在相似之处。具有非常高的强度和高可成型性的、用于通过冷冲压来制造复杂的结构部件的这样的第三代钢在激光焊接期间经受液态金属脆化。这是由于预涂层的液化锌与基材的残余奥氏体之间的相互作用。
已经开发了若干种解决方案来防止前述不利的相互作用。例如,公开文本EP2007545描述了一种下述解决方案,其包括:在将要进行焊接操作的板材的周缘的水平处去除金属合金的表面层、仅留下金属间合金层。该移除可以通过刷洗或激光光束进行。保留金属间合金层以保证耐腐蚀性并且防止在成型操作之前的热处理期间的脱碳和氧化现象。
本发明的目的是在激光焊接期间为基础金属/预涂层的相互作用提供一种新颖的解决方案。其目的在于提供一种下述预涂覆钢板:预涂覆钢板易于制造并且提高了由所述预涂覆板材制备的焊接钢部件的焊接金属区的机械强度。
为此目的,本发明的第一目标包括一种用于制造预涂覆钢板的方法,该方法至少包括至少在所述预涂覆板材的相反面中的至少一个面的周缘处的区域处施加附加涂层的步骤,所述附加涂层被选择成用于将激光焊接方法期间预涂层与所述附加涂层之间的蒸气压力增加至预涂层从焊缝喷出的临界压力。
根据本发明的方法还可以具有单独考虑或以组合的方式考虑的以下列出的可选特征:
-附加涂层的蒸发温度高于预涂层的蒸发温度。
-附加涂层包含γ相元素。
-附加涂层包含碳和/或镍。
最后,本发明还包括一种用于制造钢部件的方法,该方法至少包括对至少第一预涂覆钢板和第二预涂覆钢板进行激光焊接的步骤,其中,在所述第一预涂覆钢板和所述第二预涂覆钢板的相反面中的至少一个面的周缘处的至少一个区域已经预先涂覆有附加涂层,该附加涂层被选择成用于将激光焊接方法期间预涂层与所述附加涂层之间的蒸气压力增加至预涂层从焊缝喷出的临界压力。
根据本发明的方法还可以具有单独考虑或以组合的方式考虑的以下列出的可选特征:
-激光焊接是对接激光焊接。
-至少在所述第一预涂覆钢板和所述第二预涂覆钢板的相反面中的一个面的周缘处的区域处施加附加涂层和对所述第一预涂覆钢板和所述第二预涂覆钢板的焊接同时进行。
-附加涂层的蒸发温度高于预涂层的蒸发温度。
-附加涂层包含γ相元素。
-附加涂层包含碳和/或镍。
将在以下的描述中更详细地描述本发明的其他特征和优点。
通过参照以下附图阅读以下描述将更好地理解本发明,以下描述仅出于说明的目的提供并且绝不意在是限制性的:
-图1是根据本发明的一个实施方式的预涂覆钢板的立体示意图,
-图2是根据本发明的一个实施方式的方法的对接激光焊接操作的立体示意图,
-图3是两个预涂覆钢板的对接激光焊接操作的照片,所述两个预涂覆钢板具有Zn基预涂层并且没有附加涂层,
-图4是两个预涂覆钢板的对接激光焊接操作的照片,所述两个预涂覆钢板具有Zn基预涂层,并且其中,所述钢板的周缘涂覆有根据本发明的附加涂层,
-图5是图示了作为含碳附加涂层的厚度的函数的焊接区中的总铁素体面积百分比的曲线图,包括了没有任何附加涂层的情况,
-图6是图示了作为含碳附加涂层的厚度的函数的焊接区中的铝重量百分比的曲线图,包括了没有任何附加涂层的情况,
-图7是图示了作为含碳附加涂层的厚度的函数的焊接区中的碳重量百分比的曲线图,包括了没有任何附加涂层的情况,
-图8表示作为对应的附加涂层的厚度的函数的由两个预涂覆钢板的对接激光焊接操作产生的焊接区的极限拉伸强度的对比曲线图,其中,所述钢板的周缘涂覆有含碳的附加涂层并且涂覆有含镍的附加涂层,包括了没有任何附加涂层的情况,
-图9是两个预涂覆钢板的对接激光焊接操作的照片,所述两个预涂覆钢板具有Al基预涂层并且没有附加涂层,
-图10是两个预涂覆钢板的对接激光焊接操作的照片,所述两个预涂覆钢板具有Al基预涂层,并且其中,所述钢板的周缘涂覆有根据本发明的附加涂层。
本发明的预涂覆钢板涂覆有金属涂层,通常被设计成用来保护钢基材免受腐蚀。预涂层的金属涂层可以是例如Al基涂层,这通常用于压制硬化钢的情况。预涂层的金属涂层可以是例如Zn基涂层,这通常用于冷冲压钢的情况。Al基的意思是涂层包含以重量计的至少50%的Al。Zn基的意思是涂层包含以重量计的至少50%的Zn。
根据在如所提供的公开文本EP971044中描述的称为连续“浸涂”的方法,本发明的预涂覆钢板通过浸入熔融铝的浴中而被涂覆。术语“板材”在广义上用作通过从条带、卷或板材切割而获得的任何条带或物体。作为浸渍操作的对象的铝浴也可以包含8%至11%的硅和2%至4%的铁。因此,预涂覆钢板的预涂层是金属合金涂层,该金属合金涂层包含以重量百分比计的8%与11%之间的硅和2%与4%之间的铁。
构成板材的钢基材的钢具有以重量百分比表示的以下组成:
0.10%≦C≦0.5%
0.5%≦Mn≦3%
0.1%≦Si≦1%
0.01%≦Cr≦1%
Ti≦0.2%
Al≦0.1%
S≦0.05%
P≦0.1%
0.0002%≦B≦0.010%,
余量为铁和加工过程中不可避免的杂质。
待被相互焊接的板材可以具有相同或不同的组成。
参照图1,本发明的预涂覆钢板1包括与钢基材3接触的金属合金涂层2。金属合金涂层2具有与钢基材3的表面接触的AlSiFe型的第一金属间合金层4。该金属间合金层4由钢基材3与铝浴之间的反应产生。该金属间合金层4的顶部是形成预涂层2的表面层的金属合金层5。预涂层2存在于板材4的两个相反面6a、6b上。
根据本发明,预涂覆钢板1的顶部面6a的周缘7处的至少一个区域涂覆有附加涂层8。参照代表本发明一个实施方式的图1,附加涂层8沿着板材1的自由边缘9延伸。将进一步详细描述附加涂层8的特性。
根据本发明,附加涂层8可以由所述附加涂层8的通过施加方式比如通过旋涂或喷涂、或者使用漆刷的施加而被施加在顶部面6a或两个面6a、6b上,所述施加方式是本领域技术人员公知的。附加涂层8在激光焊接操作之前发生的单独步骤中被施加,或者在根据图2所示的与激光焊接操作相同的加工步骤中被施加。
参照图2,第一板材1和第二板材1’根据使第一板材1和第二板材1’的相应的自由边缘9、9’之间接触或几乎接触的常规激光焊接技术被边缘对边缘地安置,这被称为对接接合构型或对接焊接构型。
图2表示包括焊接头11的激光焊接机器10的一部分,焊接头11包括确保将附加涂层8、8’施加在每个板材1、1’的周缘处的至少一个施加装置12并且还包括激光光束13。在激光焊接操作期间,确保了激光焊接机器10与待焊接的板材之间的相对运动,以使焊接机器10的相对运动遵循箭头F所示的焊接方向。附加涂层8、8’通过位于激光光束13上游的施加装置12施加在预涂覆钢板1、1’的相应的周缘上。同时,激光光束13沿着钢板1、1’之间的接合部进行焊接,钢板1、1’的周缘已经涂覆有附加涂层8、8’,然后形成将两个钢板1、1’连接在一起的焊接金属区14。替代性地,激光光束可以与图2中未图示的填充丝结合。所得到的钢部件100基本上包括两个板,所述两个板将被称为通过焊接金属区14接合的基部金属101、101’。
在本领域技术人员公知的条件下并且通过本领域技术人员公知的设备实现该焊接方法。
首先根据结合预涂层2考虑的附加涂层8自身的能力来选择附加涂层8,以用于将激光焊接期间所述预涂层2与所述附加涂层8之间的蒸气压力增加至预涂层2从焊缝喷出的临界压力。当预涂层2为AlSiFe型时,其从焊接区的喷射导致避免了或至少限制了焊接金属区中的铝含量,如将进一步详述的。
为了提供这种喷射,附加涂层8必须保持处于允许预涂层2与所述附加涂层8之间的蒸气压力在激光焊接期间增加充分的状态。为此目的,优选地,附加涂层8的蒸发温度大于预涂层2的蒸发温度,使得预涂层2由于预涂层2与附加涂层8之间的焊接区域中的温度升高而导致的蒸发可以使蒸气压力增加到临界压力,其中,附加涂层8与预涂层2的一部分一起喷射。考虑到AlSiFe型预涂层2的蒸发温度与铝的约2520℃的蒸发温度相对应,优选具有蒸发温度至少高于2720℃的附加涂层8。
附加涂层8也可以优选地被选择成在焊接区中引入γ相元素。例如,附加涂层8有利地包含碳和/或镍。由于碳具有约3500℃的蒸发温度,并且镍具有约2913℃的蒸发温度,因此碳和镍都是允许预涂层2与附加涂层8之间的蒸气压力充分增加的可能候选物,如以上所解释的。当附加涂层8是碳基时,可以有利地使用导电石墨异丙醇基。
参照图3、图4和图9、图10,可以观察到的是,与没有附加涂层的预涂覆钢板的激光焊接(图3和图9)相比,本发明的包括附加涂层的预涂覆钢板的激光焊接包含呈火花的形式的材料(铝)喷射(图4和图10)。
根据本发明,附加涂层8可以沿着预涂覆钢板1的一个面上或两个相反的面上的周缘被施加。
当附加涂层8被施加在预涂覆钢板1的一个面上时并且当附加涂层8包含纯镍时,所述附加涂层8的厚度可以被包括在15μm至40μm之间、优选地在20μm至30μm之间、最优选地为约25μm。
当附加涂层8被施加在预涂覆钢板1的一个面上时并且当附加涂层8包含碳(导电石墨异丙醇基)时,所述附加涂层8的厚度可以被包括在30μm至85μm之间、优选地在35μm至50μm之间、最优选地为约40μm。
调节附加涂层8的宽度以至少覆盖焊接区。为此目的,附加涂层8的宽度可以被包括在2mm与5mm之间。
示例1
在该示例中,附加涂层8仅施加在要被焊接在一起的每个预涂覆钢板1、1’的一个面(顶部面)上。
每个预涂覆钢板1、1’都是Al-Si涂覆的压制硬化钢(PHS)(1500)。
下面在表1中给出了所使用的压制硬化钢的化学组成。
表1:钢基材的化学组成
Al-Si的预涂层2包括90重量%的铝和8重量%的硅以及2%的铁。预涂层2的厚度约15微米。
参照图5、图6和图7,附加涂层8是以商业名称导电石墨异丙醇基商业化的异丙醇基石墨电阻和干膜润滑剂涂层。在该示例中,对接焊接操作首先使用板上珠焊型构型来模拟。在该构型中,在具有和没有预先施加附加涂层的情况下,代替使用并排定位的待焊接的两个单独的预涂覆板(对接焊接构型),使用单个板材进行实验,在该单个板材上通过将激光光束施加至板材的表面来模拟激光焊接操作。由于该构型使用与对接焊接过程中相同类型的激光和相同的材料,因此板上珠焊构型是模拟与激光光束带来的能量效应以及基材、预涂层和附加涂层之间的相互作用相关的物理现象的便利的方式。因为该构型不涉及将两个板材并排放置进行焊接,因此这比对接焊接更容易实现,并且因此便于进行实验。
使用IPG光子镱光纤激光***(型号:YLS-6000-S2)以板上珠焊构型焊接预涂覆钢板,其中,功率和速度分别为4kW和4m/min。下面在
表2中提供了对激光焊接***的详细描述。
表2:激光焊接***
焊接之后,焊接板在930℃的炉中被奥氏体化5分钟,然后在平坦的模具之间进行淬火。
通过使用Clemex Vision Lite软件的图像分析来测量熔融区中的作为碳附加涂层8的厚度的函数的铁素体含量(图5的附图标记15)、铝含量(图6的附图标记16)和碳含量(图7的附图标记17)。
参照图5,可以观察到的是,与焊接板未涂覆有附加涂层时焊接金属区中的铁素体面积百分比相比,对于厚度为20μm的碳涂层,焊接金属区中的铁素体面积百分比15显著降低,并且对于厚度为40μm的碳涂层,最显著降低了30%。
该铁素体面积百分比的减少可以通过激光焊接期间包含在Al-Si的预涂层2中的铝的喷射来解释。图6证实了这种喷射,其中,可以观察到的是,与焊接板未涂覆有附加涂层时焊接金属区中的铝的重量百分比相比,对于厚度为20μm的碳涂层,焊接金属区中的铝重量百分比16显著降低,并且对于厚度为40μm的碳涂层,最显著降低了30%。
同时,如图7上所示,焊接金属区中的碳重量百分比随着碳涂层厚度的增加而增加。
图8图示了在本发明的两个预涂覆钢板的对接接合构型中由激光焊接操作产生的作为附加涂层厚度的函数的焊接区的极限拉伸强度的对比曲线图,所述两个预涂覆钢板分别涂覆有碳(附图标记19)和镍(附图标记18)的附加涂层。附图标记20代表钢基材的极限拉伸强度为1543MPa。
对于含镍(附图标记19)的附加涂层而言,针对厚度为25μm的附加涂层,极限拉伸强度达到1539MPa的最大极限拉伸强度,然后将失效从金属焊接区转移至基础金属。为了避免金属焊接区中的***故障并参照附图标记曲线19的形状,镍涂层厚度可以被包括在15μm至40μm之间、优选地在20μm至30μm之间。
对于含碳(附图标记18)的附加涂层而言,针对厚度为40μm的附加涂层,极限拉伸强度达到1555MPa的最大极限拉伸强度,然后将失效从金属焊接区转移至基础金属。为了避免金属焊接区中的***故障并参照附图标记曲线18的形状,碳涂层厚度可以被包括在30μm至85μm之间、优选地在35μm至50μm之间。
示例2
在该示例中,预涂层是通常用于冷冲压钢的情况的锌基预涂层。使用对接焊接构型进行实验。所使用的附加涂层是Ni基涂层。图9是在没有附加涂层的情况下进行的对接焊接操作的图片。可以看出,没有发生预涂层的排出。另一方面,如可以在图10上观察到的,在板材具有施加至待焊接的边缘的附加涂层的情况下,预涂层排出以火花的形式出现。
总之,通过引入碳或镍附加涂层,预涂覆钢板已经通过对接接合激光焊接成功地接合,在焊接之前,碳或镍附加涂层已经被涂覆至每个预涂覆钢板的周缘的区域的至少一个面上。焊接金属区中的铝含量降低至用以形成软δ铁素体相所需的临界值以下;因此,抑制/消除了焊池中δ铁素体相的形成。焊接金属区微观结构从铁素体-马氏体双相结构转变成完全马氏体结构,与压制硬化条件下的未焊接基础金属相比,该完全马氏体结构呈现出高机械性能(显微硬度和拉伸性能)。所获得的极限拉伸强度与未焊接的基础金属类似;断裂路径从焊接金属区转移至基础金属。在对预涂覆钢部件进行热冲压之后,焊接接头的强度和延展性提高到未焊接的基础压制硬化钢的水平。
Claims (7)
1.一种用于制造预涂覆钢板的方法,所述预涂覆钢板包括钢基材(3)和与所述钢基材(3)的表面接触的Al基或Zn基预涂层(2),所述方法至少包括至少在所述预涂覆板材(1、1’)的相反面(6a、6b)中的至少一个面(6a;6b)的周缘(7)处的区域处将附加涂层(8、8’)通过旋涂或喷涂、或者使用漆刷施加在Al基或Zn基预涂层(2)的顶部上的步骤,所述附加涂层(8、8’)具有高于所述Al基或Zn基预涂层(2)的蒸发温度并且被选择成用于将激光对接焊接方法期间所述Al基或Zn基预涂层(2)与所述附加涂层(8、8’)之间的蒸气压力增加至所述Al基或Zn基预涂层(2)从焊缝(14)喷出的临界压力;其中,所述附加涂层(8、8’)的厚度为15μm至85μm。
2.根据权利要求1所述的方法,其中,所述附加涂层包含γ相元素。
3.根据权利要求1所述的方法,其中,所述附加涂层(8、8’)包含碳和/或镍。
4.一种用于制造钢部件的方法,所述方法至少包括对至少第一预涂覆钢板(1)和第二预涂覆钢板(1’)进行激光对接焊接的步骤,所述第一预涂覆钢板(1)和所述第二预涂覆钢板(1’)各自包括钢基材(3)和与所述钢基材(3)的表面接触的Al基或Zn基预涂层(2),其中,所述第一预涂覆钢板(1)和所述第二预涂覆钢板(1’)的相反面(6a、6b)中的至少一个面(6a;6b)的周缘(7)处的至少一个区域已经预先涂覆有附加涂层(8、8’),所述附加涂层(8、8’)通过旋涂或喷涂、或者使用漆刷被施加在Al基或Zn基预涂层(2)的顶部上,所述附加涂层(8、8’)具有高于所述Al基或Zn基预涂层(2)的蒸发温度并且被选择成用于将激光对接焊接方法期间所述Al基或Zn基预涂层(2)与所述附加涂层(8、8’)之间的蒸气压力增加至所述Al基或Zn基预涂层(2)从焊缝(14)喷出的临界压力。
5.根据权利要求4所述的方法,其中,至少在所述第一预涂覆钢板(1)和所述第二预涂覆钢板(1’)的所述相反面(6a、6b)中的一个面(6a)的所述周缘(7)处的区域处施加所述附加涂层(8、8’)和对所述第一预涂覆钢板(1)和所述第二预涂覆钢板(1’)的激光对接焊接同时进行。
6.根据权利要求4或5所述的方法,其中,所述附加涂层(8、8’)包括γ相元素。
7.根据权利要求4或5所述的方法,其中,所述附加涂层(8、8’)包含碳和/或镍。
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