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首页> 外文会议>AIST steel properties amp; applications conference proceedings combined with MSamp;T' 10 materials science and technology 2010 >Effect of Alloying Elements in High-strength Steels on the Microstructure of Galvannealed Coatings
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Effect of Alloying Elements in High-strength Steels on the Microstructure of Galvannealed Coatings

机译：高强度钢中合金元素对热镀锌层组织的影响

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摘要

In order to improve the performances of high-strength steel sheets, considerable amounts of alloying elements, such as P, Mn, and Si, are often added into the steels. However, the presence of alloying elements often deteriorates the surface properties of steels, and further affects the appearance and properties of the galvannealed (GA) coatings. In this study, the effect of alloying elements on the microstructure of GA coatings has been investigated by OM of chemically etched cross sections, SEM/EDS, XRD and galvanostatic electrochemical stripping technique. The GA coatings of all investigated specimen mainly consist of the randomly columnar 5 phase, as revealed by SEM surface morphology and XRD. Continuous Γ phase appears at the substrate/coating interface in interstitial-free (IF) steels and high-strength (HS) steel, while only Γ_1 phase is observed in interstitial-free rephosphorized (IFP) steel. The Γ_1 phase appearing in a light-blue color on the etched cross section displays a columnar structure observed using SEM. Surface defects have been identified on HS steel, which is due to the poor wettability with molten Zn caused by surface oxides of alloying elements in the HS steel. The galvanostatic electrochemical stripping curve oscillates as the attack approaches the steel substrate, especially for the galvannealed IFP and HS steels. As a result, this oscillation is likely associated with the surface segregation of P and the presence of surface oxides.
机译：为了提高高强度钢板的性能，经常向钢中添加大量的合金元素，例如P，Mn和Si。但是，合金元素的存在通常会降低钢的表面性能，并进一步影响镀锌（GA）涂层的外观和性能。在这项研究中，通过化学蚀刻截面的OM，SEM / EDS，XRD和恒电流电化学剥离技术研究了合金元素对GA涂层微观结构的影响。 SEM表面形貌和XRD表明，所有试样的GA涂层主要由无规柱状5相组成。在无间隙（IF）钢和高强度（HS）钢中，连续的Γ相出现在基材/涂层界面处，而在无间隙的再磷化（IFP）钢中仅观察到Γ_1相。在蚀刻截面上以浅蓝色出现的Γ_1相显示出使用SEM观察到的柱状结构。在HS钢上已发现表面缺陷，这是由于HS钢中合金元素的表面氧化物引起的与熔融Zn的润湿性差。当腐蚀接近钢基材时，恒电流电化学剥离曲线会振荡，特别是对于经过镀锌的IFP和HS钢。结果，这种振荡很可能与P的表面偏析和表面氧化物的存在有关。

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