不同腐蚀条件下L360钢慢应变速率拉伸性能分析

Analysis of SSRT Performance of L360 Steel Under Different Corrosive Conditions

利用慢应变速率拉伸法研究了L360钢在NACE 0177—2005标准A溶液、模拟地层水两种腐蚀环境中的慢应变速率拉伸性能,运用扫描电镜SEM分析L360钢在两种腐蚀介质中的裂纹扩展规律及其断口形貌特征。综合分析A溶液、模拟地层水与空气中的慢应变拉伸实验结果发现,L360钢抗拉强度在A溶液和模拟地层水中分别衰减3.1%和12.1%,断后延伸率分别降低48.3%和69.2%,慢应变速率拉伸过程中发生形变、开裂直至断裂破坏所吸收的应变能分别降低47.5%和75.9%,说明L360钢在两种腐蚀介质中抵抗环境腐蚀和载荷冲击的能力均明显下降,在模拟地层水中具有较高的SCC敏感性。

The slow strain race test （SSRT） is applied to study the slow strain rate tensile properties of L360 steel in Solution A in NACE 0177 -2005 standard and simulate the formation water under two different corrosive environments. The crack propagation law and fracture morphology of L360 steel in different corrosive environments are analyzed by scanning electron microscope （SEM）. The analysis of solution A and simulation of SSRT of formation water have found that L360 steel＇ s tensile strength is reduced by 3.1% and 12.1% respectively in simulation solution A and formation water and the break elongation is reduced by 48.3% and 69.2%. The strain absorbed by formation change, cracking and fracture in the process of SSRT is lowered by 47.5% , and 75.9% respectively, which indicates that both the corrosion resistance and anti - impact performances of L360 steel in two corrosive media are obviously reduced, and has a higher SCC sensitivity in the simulated formation water.