通过拉伸实验研究电化学充氢对5Cr油管钢拉伸性能的影响表明:随充氢时间和充氢电流密度的增加,5Cr油管的强度和塑性有所减小.用扫描电镜(SEM)观察断口发现其形貌以韧窝为主要特征,与未充氢试件相比,充氢试样拉伸断裂后韧窝尺寸变小、变浅,数量增多,这说明材料的塑性损失增大.充氢到一定值后材料由韧性断裂转变为脆性断裂.
Tensile tests were used to investigate the mechanical behaviors of 5Cr tubing after electrochemical hydrogen charging. The experiment results show that the tensile strength and the plasticity decreased with the increase of pre-charging time and pre-charging density. Analysis on the fracture morphology by scanning electron microscope (SEM) indicated that the fracture surfaces of 5Cr tubing were characteristic of ductile dimple fracture pattern after electrochemical hydrogen charging. The diameter and depth of ductile dimple were smaller than the specimen without charging, but the number of ductile dimple was increased, which means that the loss of plastic properties was increased. When the hydrogen concentration reached a certain value, the fracture mode was changed from ductile fracture to brittle fracture.
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