基板表层组织对<strong>Fe-16Mn-0.7C-1.5Al TWIP</strong>钢可镀性的影响

doi:10.11900/0412.1961.2021.00106

金属学报

2022, Vol. 58

Issue (12): 1600-1610 DOI: 10.11900/0412.1961.2021.00106

研究论文

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基板表层组织对Fe-16Mn-0.7C-1.5Al TWIP钢可镀性的影响

彭俊¹, 金鑫焱²^,³(

), 钟勇²^,³, 王利²^,³

^1.宝山钢铁股份有限公司冷轧厂上海 200941
^2.宝山钢铁股份有限公司中央研究院上海 201999
^3.汽车用钢开发与应用技术国家重点实验室(宝钢) 上海 201999

Influence of Substrate Surface Structure on the Galvanizability of Fe-16Mn-0.7C-1.5Al TWIP Steel Sheet

PENG Jun¹, JIN Xinyan²^,³(

), ZHONG Yong²^,³, WANG Li²^,³

^1.Cold Rolling Plant, Baoshan Iron & Steel Co., Ltd., Shanghai 200941, China
^2.Central Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201999, China
^3.State Key Laboratory of Development and Application Technology of Automotive Steels, Baosteel, Shanghai 201999, China

引用本文:

彭俊, 金鑫焱, 钟勇, 王利. 基板表层组织对Fe-16Mn-0.7C-1.5Al TWIP钢可镀性的影响[J]. 金属学报, 2022, 58(12): 1600-1610.
Jun PENG, Xinyan JIN, Yong ZHONG, Li WANG. Influence of Substrate Surface Structure on the Galvanizability of Fe-16Mn-0.7C-1.5Al TWIP Steel Sheet[J]. Acta Metall Sin, 2022, 58(12): 1600-1610.

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摘要:

以16%Mn-0.7%C-1.5%Al (质量分数) TWIP钢为研究对象，采用热镀锌模拟实验研究了2种基板表层组织对TWIP钢可镀性的影响。使用180°折弯检测了镀层附着性，使用GD-OES分析了退火及镀锌试样表面的元素深度分布，使用SEM观察了试样表面和截面微观形貌。结果表明，通过预处理得到的TWIP钢表面一层铁素体晶粒可以有效改善TWIP钢的可镀性。当轧硬态的TWIP钢直接连续退火并热镀锌时，Mn元素形成了明显的外氧化，严重阻碍了镀液中的Al和基板反应形成Fe-Al抑制层，不仅漏镀明显，而且镀层附着性差。当使用经过预处理、表面有一层铁素体的TWIP钢进行热镀锌时，TWIP钢表面的细晶粒铁素体层有效抑制了退火过程中Mn元素外氧化，从而显著改善了锌液对带钢的润湿性，在镀层/基板界面位置形成了充分的Fe-Al抑制层。通过预处理得到的表面铁素体层可以有效解决16%Mn-0.7%C-1.5%Al TWIP钢的可镀性差和镀层附着性差问题。

关键词 ： TWIP钢, 可镀性, 选择性氧化, 表层铁素体晶粒

Abstract：

Twinning-induced plasticity (TWIP) steels with a high Mn content show an advanced combination of strength and formability among the commercially available advanced high-strength steels for automotive applications. However, applying zinc coatings on TWIP steels using the continuous hot-dip galvanizing process remains a great challenge owing to the selective oxidation of Mn that occurs during continuous annealing before hot dipping. In this study, a potential procedure for improving the galvanizability of TWIP steels is developed and its mechanism is discussed. Both as-received cold-rolled and pretreated 16%Mn-0.7%C-1.5%Al (mass fraction) TWIP steel sheets were galvanized using the hot-dip process in a laboratory, and the influence of the substrate surface structure on the galvanizability of the TWIP steel sheets was studied. The wettability of molten zinc on the TWIP steel sheets was examined, and the coating adhesion was tested by bending at 180°. The elemental depth profiles of both the annealed and galvanized panels were analyzed via glow discharge optical emission spectroscopy, and the surface and cross-sectional morphologies were observed via SEM. Results indicated that a thin layer of fine ferrite grains produced using the pretreatment process could effectively improve the galvanizability of the TWIP steel. When the as-received cold-rolled TWIP steel was galvanized using the hot-dip process, the dominant external oxidation of Mn was observed on the steel surface before hot dipping, which prevented the formation of an Fe-Al inhibition layer and further resulted in poor galvanizability and deteriorated coating adhesion. When a thin layer of fine ferrite grains covered the TWIP steel surface, the galvanizability was considerably improved even though the ferrite layer thickness was less than 1 μm. The presence of surface ferrite grains almost completely suppressed the external oxidation of Mn during the annealing process, resulting in a clean surface similar to that of an interstitial-free or bake-hardened steel. Therefore, the wettability of molten zinc on the TWIP steel sheet improved considerably and a sufficient Fe-Al inhibition layer was formed. The formation of a thin layer of surface ferrite grains on the 16%Mn-0.7%C-1.5%Al TWIP steel facilitates a novel technique for addressing problems associated with galvanizability and coating adhesion.

Key words： TWIP steel galvanizability selective oxidation surface ferrite grain

收稿日期: 2021-03-10

ZTFLH:

TG156.2

作者简介: 彭俊，男，1973年生，高级工程师

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00106 或 https://www.ams.org.cn/CN/Y2022/V58/I12/1600

表1 实验用样板信息

图1 试样B截面组织EBSD像

图2 模拟热镀锌试样上分析区域示意图

图3 热镀锌模拟实验热处理曲线

图4 斜镶截面金相制备及观察示意图

图5 热镀锌试样外观

图6 镀层附着性检测试样外观

图7 退火前后试样表面Fe、Mn、Al、O元素深度分布

图8 热镀锌试样表面Zn、Fe、Mn、Al元素深度分布

图9 退火试样表面SEM形貌及EDS分析结果

表2 图9中EDS半定量分析结果 (mass fraction / %)

图10 镀锌试样溶掉锌层后基板表面形貌SEM像

表3 图10中EDS半定量分析结果 (mass fraction / %)

图11 镀锌试样截面形貌

图12 镀锌试样A截面OM像

图13 试样B截面EDS结果

图14 试样B局部异常长大组织形貌

图15 基板表层组织对TWIP钢可镀性的影响示意图

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