Dan Wen-Jiao, Shi Hao, Tang Cheng-Wang, Wang Xu-Yang
School of Mechanical Engineering, Anhui Science and Technology University, Chuzhou 233100, China.
School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2024 Aug 30;17(17):4290. doi: 10.3390/ma17174290.
Extended exposure to seawater results in the erosion of the structural high-strength steels utilized in marine equipment, primarily due to the infiltration of hydrogen. Consequently, this erosion leads to a decrease in the mechanical properties of the material. In this investigation, the mechanical responses of Q690 structural high-strength steel specimens were investigated by considering various hydrogen charging parameters, such as the current density, charging duration, and solution concentration values. The findings highlighted the significant impacts of electrochemical hydrogen charging parameters on the mechanical behaviors of Q690 steel samples. Specifically, a linear relationship was observed between the mechanical properties and the hydrogen charging current densities, while the associations with the charging duration and solution concentration were nonlinear. Additionally, the fracture morphology under various hydrogen charging parameters was analyzed and discussed. The results demonstrate that the mechanical properties of the material degrade with increasing hydrogen charging parameters, with tensile strength and yield stress decreasing by approximately 2-4%, and elongation after fracture reducing by about 20%. The findings also reveal that macroscopic fractures exhibit significant necking in uncharged conditions. As hydrogen charging parameters increase, macroscopic necking gradually diminishes, the number of microscopic dimples decreases, and the material ultimately transitions to a fully brittle fracture.
长时间暴露在海水中会导致船舶设备中使用的结构高强度钢被侵蚀，这主要是由于氢的渗入。因此，这种侵蚀会导致材料的力学性能下降。在本研究中，通过考虑各种充氢参数，如电流密度、充电持续时间和溶液浓度值，研究了Q690结构高强度钢试样的力学响应。研究结果突出了电化学充氢参数对Q690钢样品力学行为的显著影响。具体而言，观察到力学性能与充氢电流密度之间存在线性关系，而与充电持续时间和溶液浓度的关系是非线性的。此外，还对各种充氢参数下的断口形貌进行了分析和讨论。结果表明，材料的力学性能随着充氢参数的增加而降低，抗拉强度和屈服应力降低约2 - 4%，断后伸长率降低约20%。研究结果还表明，在未充氢条件下，宏观断口呈现明显的颈缩现象。随着充氢参数的增加，宏观颈缩逐渐减小，微观韧窝数量减少，材料最终转变为完全脆性断裂。
