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首页> 美国卫生研究院文献>Materials >Microstructure Mechanical Properties and Corrosion Behavior of Ultra-Low Carbon Bainite Steel with Different Niobium Content
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Microstructure Mechanical Properties and Corrosion Behavior of Ultra-Low Carbon Bainite Steel with Different Niobium Content

机译：超低碳贝氏体钢与不同铌含量的微观结构力学性能和腐蚀行为

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摘要

Four types of ultra-low carbon bainite (ULCB) steels were obtained using unified production methods to investigate solely the effect of niobium content on the performance of ULCB steels. Tensile testing, low-temperature impact toughness testing, corrosion weight-loss method, polarization curves, electrochemical impedance spectroscopy (EIS), and the corresponding organizational observations were realized. The results indicate that the microstructure of the four steels comprise granular bainite and quite a few martensite/austenite (M/A) elements. The niobium content affects bainite morphology and the size, quantity, and distribution of M/A elements. The elongation, yield strength, and tensile strength of the four types of ULCB steels are above 20%, 500 MPa, and 650 MPa, respectively. The impact toughness of the four types of ULCB steels at −40 °C is lower than 10 J. Steel with Nb content of 0.0692% has better comprehensive property, and maximum charge transfer resistance in 3.5 wt.% NaCl solution at the initial corrosion stage. The corrosion products on the surface of steel with higher niobium content are much smoother and denser than those steel with lower niobium content after 240 h of corrosion. The degree of corrosion decreases gradually with the increase of niobium content at the later stage of corrosion.
机译：使用统一的生产方法获得四种类型的超低碳贝氏体（ULCB）钢，以仅研究铌含量对ULCB钢的性能的影响。拉伸试验，低温冲击韧性试验，腐蚀减肥方法，偏振曲线，电化学阻抗光谱（EIS）和相应的组织观察。结果表明，四钢的微观结构包括颗粒状贝氏体和相当几个马氏体/奥氏体（M / A）元件。铌含量影响贝氏体形态和M / A元素的尺寸，数量和分布。四种类型的ULCB钢的伸长，屈服强度和拉伸强度分别高于20％，500MPa和650MPa。 -40°C的四种类型的ULCB钢的冲击韧性低于10 J.钢，Nb含量为0.0692％，具有更好的综合性质，以及3.5重量％的最大电荷转移阻力。％NaCl溶液在初始腐蚀阶段。铌表面上的腐蚀产物具有更高的铌含量更平滑，比腐蚀240小时后铌含量较低的钢更平滑。随着腐蚀后期铌含量的增加，腐蚀程度逐渐降低。

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