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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

汽车轮毂螺栓断裂分析

陈伟峰,徐云峰,任鹏波,余兆新,徐国平

物理测试

高强度汽车轮毂螺栓在汽车运行时发生断裂。对断裂螺栓进行宏观和微观检验、化学成分分析、 金相检验硬度检测等方面的分析,结果表明:螺栓化学成分和金相组织均正常。经对螺栓变形情况及受力情况分析,认为螺纹损伤、安装工人的安装不得当,引起螺栓安装时预紧力不足,导致螺栓发生疲劳断裂。

关键词: 轮毂螺栓 , fatigue , failure analysis

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