Effect of Relative Humidity on Crack Growth Mechanism of Hot Dip Galvanized Steel in Atmospheric Environment
Effect of Relative Humidity on Crack Growth Mechanism of Hot Dip Galvanized Steel in Atmospheric Environment
复制标题
大气环境中相对湿度对热镀锌钢裂纹扩展机制的影响
DOI：
10.1149/08010.0609ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Motoda Shinichi
中科院分区：
文献类型：
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作者：
Hasegawa Kayo;Morita Motoaki;Motoda Shinichi
在这项研究中，镀锌AISI 1045钢的腐蚀疲劳机制引起的湿度进行了讨论。在低周疲劳和中周疲劳（Nf< 10 5周）中，RH= 80%条件下的疲劳强度与大气湿度条件下的疲劳强度基本相当。在高周疲劳（Nf≥ 105周）中，RH= 80%条件下的疲劳强度和疲劳极限均大于大气湿度条件下的疲劳强度。在大气湿度条件下，镀锌层不发生氧化，其硬度也不发生变化。另一方面，在RH= 80%的条件下，镀锌层氧化，并且其硬度增加。从这些结果可以看出，高湿度条件下的疲劳强度的增加是由于氧化层的形成延迟了裂纹的发生。
In this study, the corrosion fatigue mechanism of the galvanized AISI 1045 steel caused by humidity was discussed. In low-cycle fatigue and middle-cycle one (number of cycles to failure, Nf< 10 5 cycles), the fatigue strength under the condition of RH= 80% was mostly equal to that under the condition of atmospheric humidity. In high-cycle fatigue (Nf≥ 10 5 cycles), the fatigue strength and fatigue limit under the condition of RH= 80% were larger than the fatigue strength under the condition of atmospheric humidity. Under the condition of atmospheric humidity, the galvanized layer did not oxidize, and its hardness did not change. Under the condition of RH= 80%, on the other hand, the galvanized layer oxidized, and its hardness increased. From these results, it seems that the increase of fatigue strength under the condition of high humidity was caused by delaying the occurrence of cracks by formation of the oxide layer.