Purpose

The purpose of this study is to develop the existence and mechanism of stress corrosion cracking (SCC) for A517 steel in marine environments.

Design/methodology/approach

Slow strain rate test (SSRT) and constant load tests were used to investigate the SCC susceptibility of A517 steel. In addition, the additive stresses caused by the corrosion film and hydrogen entering into steel were applied to reveal the fundamental mechanism of the SCC.

Findings

The SCC susceptibility increased due to anodic dissolution and additive stress caused by the corrosion-produced film under anode polarization. Furthermore, the SCC susceptibility increased with increasing cathodic polarization, which is due to the increased additional stress caused by hydrogen entering into the steel. However, when the cathode polarization further increased, the additional stress remained due to the constant hydrogen content, thus the SCC susceptibility did not vary. Moreover, the SCC susceptibility of A517 steel under an alternate immersion environment (AIE) was lower than that under a full immersion environment and the steel under the AIE with 0.5 W/D had the lowest SCC susceptibility.

Originality/value

The stress corrosion behaviors of A517 in marine environments under various conditions were systematically analyzed.

中文翻译：

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A517钢在海洋环境中的应力腐蚀开裂

目的

本研究的目的是研究海洋环境中 A517 钢应力腐蚀开裂 (SCC) 的存在和机制。

设计/方法/方法

使用慢应变速率试验 (SSRT) 和恒定载荷试验来研究 A517 钢的 SCC 敏感性。此外，由腐蚀膜和氢进入钢引起的附加应力被用来揭示 SCC 的基本机制。

发现

由于阳极极化下腐蚀产生的薄膜引起的阳极溶解和附加应力，SCC 敏感性增加。此外，SCC 敏感性随着阴极极化的增加而增加，这是由于氢进入钢引起的附加应力增加。然而，当阴极极化进一步增加时，由于氢含量不变，附加应力仍然存在，因此 SCC 敏感性没有变化。此外，A517 钢在交替浸泡环境 (AIE) 下的 SCC 敏感性低于完全浸泡环境下的 SCC 敏感性，且 AIE 下 0.5 W/D 的钢的 SCC 敏感性最低。

原创性/价值

系统分析了A517在各种条件下海洋环境中的应力腐蚀行为。