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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Study on the Microstructure, Mechanical Properties and Corrosion Resistance of a Novel HSLA Steel
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Study on the Microstructure, Mechanical Properties and Corrosion Resistance of a Novel HSLA Steel

机译：新型HSLA钢的组织，力学性能和耐蚀性研究

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The microstructure, mechanical properties and corrosion resistance of a novel HSLA bridge steel_have been investigated. Optical microscopy, scan electron microscopy were employed to examine the microstructure of the steels. Corrosion behavior of the steel was studied by using a laboratory-accelerated test that involving cyclic wet/dry treatments in a chloride containing environment (5 wt.% NaCl). The rust structure was analyzed by optical observation and X-ray diffraction. A carbon steel (Q345) and a weathering steel (Con-Ten A) were utilized as contrasts. It was revealed that the novel HSLA steel consists of ferrite and bainite, while Q345 and CorTen A steels are constituted by ferrite and pearlite. The susceptibility of the steels to corrosion could be listed in the following order based on their weight loss (from high to low): Q345 > CorTen A > the novel HSLA steel. In addition, the corrosion products on the tested steels were composed of a Joose outer rust layer and a dense inner rust layer. The outer rust layer of each steel was composed of magnetite (Fe_3O_4), α-FeOOH, γ-FeOOH, H_2O, and amorphous ferric oxyhydroxide (FeO_x(OH)_(3-2x), x = 0 - 1). Finally, combining the results of the accelerated tests and the rust layer analysis, it can be concluded that the novel HSLA steel possesses better weathering properties than the CorTen A for use in the humid and salty atmosphere.
机译：研究了新型HSLA桥梁钢的组织，力学性能和耐蚀性。用光学显微镜，扫描电子显微镜检查钢的显微组织。通过实验室加速试验研究了钢的腐蚀行为，该试验涉及在含氯化物的环境（5％重量的NaCl）中进行循环湿法/干法处理。通过光学观察和X射线衍射分析铁锈结构。对比使用碳素钢（Q345）和耐候钢（Con-Ten A）。结果表明，新型HSLA钢由铁素体和贝氏体组成，而Q345和CorTen A钢则由铁素体和珠光体组成。根据其重量损失（从高到低），可以按以下顺序列出钢的腐蚀敏感性：Q345> CorTen A>新型HSLA钢。另外，被测钢上的腐蚀产物由Joose外锈层和致密内锈层组成。每种钢的外锈层由磁铁矿（Fe_3O_4），α-FeO​​OH，γ-FeOOH，H_2O和无定形羟基氧化铁（FeO_x（OH）_（3-2x），x = 0-1）组成。最后，结合加速试验的结果和防锈层分析，可以得出结论，新型HSLA钢在潮湿和咸气的环境中比CorTen A具有更好的耐候性。

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