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›› 2013, Vol. 13 ›› Issue (1): 139-145.

• 材料工程专栏 • Previous Articles     Next Articles

Microstructure and Growth Kinetics of High Strength Low-alloy Steel with Hot-dipping of 55%Al-Zn-1.6%Si (≤0.1%Ti)

PEI Jin-bang WU Guang-xin ZHANG Jie-yu WANG Bo   

  1. School of Materials Science and Engineering, Shanghai University College of Materials Science and Engineering, Shanghai University College of Materials Science and Engineering, Shanghai University Department of Nonferrous Metallurgy, Northeastern University
  • Received:2013-03-06 Revised:1900-01-01 Online:2013-02-20 Published:2013-02-20
  • Contact: PEI Jin-bang

低合金高强钢热浸镀55%Al-Zn-1.6%Si(≤0.1%Ti)合金层的组织及生长动力学

裴金榜 吴广新 张捷宇 王波   

  1. 上海大学材料与冶金学院 上海大学上海市现代冶金与材料制备重点实验室 上海大学材料学院 东北大学材料与冶金学院
  • 通讯作者: 裴金榜

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Abstract: Microstructure and growth kinetics of high strength low-alloy steel (H420) with hot-dipping 55%Al-Zn-1.6%Si (≤0.1%Ti) and 55%Al-Zn-1.6%Si were comparatively investigated. Optical microscope, SEM with energy dispersive spectrometer (EDS) and XRD were used to study the intermetallic layer thickness, microstructure, elemental distribution and phase composition. The results showed that the intermetallic layer was composed of Fe2Al5, Fe4Al13 and Fe-Al-Si intermetallic compound. A small amount of Fe-Al-Si-Mn solid solution existed in the border area between Fe2Al5 and Fe4Al13 phases, the reason was possibly that Mn diffused into the intermetallic layer. Meanwhile, the growth mechanism of intermetallic layer was characterized. The growth rate of intermetallic layer followed the parabolic law, Ti addition decreased the thickness of total intermetallic layer and Fe2Al5 layer about 3.25 and 1.83 mm. Ti-Al bond-energy was greater than Fe-Al one, Ti addition affected the interaction of Fe-Al bond, so the growth of intermetallic compound was restrained, and eventually reduced the intermetallic layer thickness.

Key words: high strength low-alloy steel, 55%Al-Zn-1.6%Si (≤0.1%Ti) alloy, microstructue, growth kinetics

摘要： 比较研究了H420低合金高强钢板热浸镀55%Al-Zn-1.6%Si (≤0.1%Ti)和55%Al-Zn-1.6%Si金属间反应层组织及生长动力学. 利用光学显微镜、SEM、EDS和XRD对反应层微观组织、厚度、元素分布及相组成进行了分析. 结果表明，金属间反应层都主要由Fe2Al5, Fe4Al13和Fe-Al-Si金属间化合物三相构成. Fe2Al5相与Fe4Al13相交界区域存在少量的Fe-Al-Si-Mn固溶体析出物，可能主要因基板中的Mn元素扩散进入合金层. 金属间反应层的生长速率遵循抛物线规律. 相比较，H420+GL+Ti金属间反应层总厚度平均降低了3.25 mm，Fe2Al5相厚度平均降低了1.83 mm. 主要原因是，Ti-Al键能明显要大于Fe-Al键能，添加Ti影响了Fe-Al的相互作用，从而抑制Fe-Al金属间化合物的形成和生长，最终降低了反应层厚度.

关键词: 低合金高强钢, 55%Al-Zn-1.6%Si (≤0.1%Ti)合金, 微观结构, 生长动力学

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