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首页> 外文期刊>Materials Science and Engineering >Influence of different heat-affected zone microstructures on the stress corrosion behavior and mechanism of high-strength low-alloy steel in a sulfurated marine atmosphere
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Influence of different heat-affected zone microstructures on the stress corrosion behavior and mechanism of high-strength low-alloy steel in a sulfurated marine atmosphere

机译：硫化海洋环境中不同热影响区组织对高强度低合金钢应力腐蚀行为及机理的影响

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摘要

The stress corrosion cracking (SCC) behavior and mechanism of the simulated heat-affected zone (HAZ) of high-strength low-alloy (HSLA) steel in a sulfurated marine atmosphere were surveyed in detail using electrochemical measurements and slow strain rate tensile (SSRT) tests combined with microstructure analysis. The SCC of the simulated HAZs is controlled by both anodic dissolution (AD) and hydrogen embrittlement (HE), which are attributed to the synergistic effect of Cl- and SO42-, as Cl--induced localized dissolution causes microcrack initiation, and SO42--catalyzedacid regeneration facilitates microcrack propagation. The intercritical HAZ and fine-grained HAZ present high crack numbers because of the high amount of prior austenite grain boundaries (PAGBs), lath bainite boundaries (LBBs), and martensite/austenite (M/A) constituents, which act as preferential sites for hydrogen trapping and crack initiation. However, coarse-grained HAZ exhibits the highest SCC susceptibility because of the coarse PAGBs, wide lath bainites (LBs), and high local dislocation density, which promote crack propagation.
机译：使用电化学测量和慢应变速率拉伸（SSRT）方法，详细调查了高强度低合金（HSLA）钢在硫化海洋环境中的应力腐蚀开裂（SCC）行为和模拟热影响区（HAZ）的机理。 ）测试与微观结构分析相结合。模拟的热影响区的SCC受阳极溶解（AD）和氢脆（HE）的控制，这归因于Cl-和SO42-的协同作用，因为Cl诱导的局部溶解会引起微裂纹引发，而SO42- -催化酸再生促进微裂纹的扩散。由于大量的先前奥氏体晶界（PAGBs），板条贝氏体晶界（LBBs）和马氏体/奥氏体（M / A）成分，临界间热影响区和细粒热影响区呈现出高裂纹数，它们充当了优先点氢捕获和裂纹萌生。但是，由于粗PAGB，宽板条贝氏体（LB）和高局部位错密度（会促进裂纹扩展），粗晶粒HAZ表现出最高的SCC敏感性。

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