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Fatigue Behaviour of Naval Steel Under Seawater Environmental and Variable Loading Conditions

C Gheorghies , L Palaghian , S Baicean , M Buciumeanu , S Ciortan

钢铁研究学报(英文版)

The way to characterize the behaviour of a naval steel grade E36 subjected to the corrosive fatigue process is investigated. The tests were carried out by bending fatigue of plate specimens with thickness of 10 mm in the corrosive environment consisting of an aqueous solution of 35% of NaCl which is similar to seawater. Experimental results show that the principal mechanism of degradation of the superficial layer is based on the pit evolution, evidenced by electrochemical, micro and macro structural timely changes such as evolution of electrode potential, evolution of current density, polarization resistance, anodic and cathodic parameters, and dislocation density evolution.

关键词: naval steel , fatigue , pitting corrosion , structure

无取向硅钢表面纳米结构的渗硅行为

莫成刚 , 刘刚 , 黄璞 , 左良

钢铁

对3%无取向硅钢进行表面机械研磨处理（SMAT），获得表面纳米结构，再进行550~650℃、4h固体粉末渗硅处理，用透射电镜（TEM）、扫描电镜（SEM）和X射线衍射仪（XRD）研究表层组织演变。结果表明：经过SMAT后，3%无取向硅钢表面晶粒尺寸降低至10nm左右，纳米晶层厚度约为20μm。经过550~650℃、4h渗硅处理后，SMAT样品表面形成化合物层，其厚度随着渗硅温度的升高由27μm增加到150μm。化合物层由FeSi和Fe3Si两相组成，其中FeSi相随着渗硅温度的升高而逐渐增加。

关键词: 无取向硅钢 , surface nanocrystallization , siliconizing treatment , structure

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