CAJ | 학술논문

采用慢应变速率应力腐蚀拉伸试验方法,开展了 FV520B 钢在模拟管道压缩机叶轮腐蚀介质环境中的高温、高压应力腐蚀开裂(SCC)研究,探讨了 H2 S 浓度、CO2浓度、温度、压力等环境参数对 FV520B 钢应力腐蚀开裂的影响规律和作用机制。试验结果表明,H2 S 起主要腐蚀作用,应力腐蚀敏感指数随 H2 S 浓度的增加而增大,而压力在一定范围内对应力腐蚀敏感指数影响不大。通过试样断口微观形貌观察分析,研究其应力腐蚀行为和机理,并计算不同环境参数下的应力腐蚀敏感指数,运用回归分析方法建立了 FV520B 钢在H2 S /CO2环境中应力腐蚀敏感指数与介质浓度、温度、压力等环境参数之间的数学模型,表明 H2 S 浓度、温度对应力腐蚀敏感指数的影响较为显著,同时,4种参数对应力腐蚀敏感指数产生交互作用。
채용만응변속솔응력부식랍신시험방법,개전료 FV520B 강재모의관도압축궤협륜부식개질배경중적고온、고압응력부식개렬(SCC)연구,탐토료 H2 S 농도、CO2농도、온도、압력등배경삼수대 FV520B 강응력부식개렬적영향규률화작용궤제。시험결과표명,H2 S 기주요부식작용,응력부식민감지수수 H2 S 농도적증가이증대,이압력재일정범위내대응력부식민감지수영향불대。통과시양단구미관형모관찰분석,연구기응력부식행위화궤리,병계산불동배경삼수하적응력부식민감지수,운용회귀분석방법건립료 FV520B 강재H2 S /CO2배경중응력부식민감지수여개질농도、온도、압력등배경삼수지간적수학모형,표명 H2 S 농도、온도대응력부식민감지수적영향교위현저,동시,4충삼수대응력부식민감지수산생교호작용。
Based on simulating corrosion environments of centrifugal compressor for natural gas pipe line ,the stress corrosion cracking (SCC)of FV520B steel was studied by slow strain rate testing (SSRT)method,and the effecting law and action mechanism of concentration of H2 S and CO2 ,temperature and pressure on the SCC were discussed.The results show that H2 S plays a major role on the corrosion,the stress corrosion sensitivity index (IS )increases with the increase of concentration of H2 S,while the stress in certain range has little effect.We researched the corrosion behavior of FV520B steel by analyzing the micro fracture morphology,calculated the IS in different environment parameters. Finally, the mathematical model of the environment parameters and the IS of FV520B was established with the regression analysis method.The model shows that the influence of H2 S concentration and temperature on the IS is significant,and four parameters have interaction on the IS .