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首页> 外文期刊>Engineering failure analysis >Corrosion fatigue crack propagation behavior of S135 high-strength drill pipe steel in H2S environment
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Corrosion fatigue crack propagation behavior of S135 high-strength drill pipe steel in H2S environment

机译：H2S环境中S135高强度钻杆钢腐蚀疲劳裂纹传播行为

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Corrosion fatigue crack propagation (CFCP) tests were employed to investigate the behavior of S135 low carbon high-strength drill pipe steel under different strain rates in a simulated H2S containing drilling environment. Results revealed that the CFCP rate curve of the S135 steel has the characteristics of stress corrosion and corrosion fatigue (CF), which can be divided into near threshold, platform and rapid propagation zone. H2S has an obvious acceleration effect on the CFCP rate of S135 steel, the propagation rate of S135 steel in H2S solution is about 10 times more than that of in air. The stress ratio R has different effects on rapid propagation and near threshold zone. In the rapid propagation zone, the order of CFCP rate from high to low is R = 0.1 R = 0.3 R = 0.5, while the order of near threshold zone just shows the opposite. In the near threshold zone, the CFCP rate increases with the increasing of the stress ratio R. Based on the proposed Corrosion-Passivation-Fracture model and elastic fracture mechanics, the CFCP rate expression of S135 steel in H2S solution is (da/dN)(cf)= 1.927 x 10(-9) [Delta K - 6.15(1 - R)(0.59)]2, which can be used to predict the CFCP life in practical engineering. Fracture analysis results shows that the CFCP of S135 steel in H2S solution is mainly controlled by anodic dissolution and hydrogen embrittlement.
机译：使用腐蚀疲劳裂纹繁殖（CFCP）试验在含钻井环境中的模拟H2S中的不同应变率下的S135低碳高强度钻管钢的行为研究。结果表明，S135钢的CFCP速率曲线具有应力腐蚀和腐蚀疲劳（CF）的特点，可分为接近阈值，平台和快速传播区。 H2S对S135钢的CFCP速率具有明显的加速度影响，H2S溶液中S135钢的传播速率比空气中大约10倍。应力比R对快速传播和接近阈值区域具有不同的影响。在快速传播区中，CFCP速率从高到低的顺序为r = 0.1＆ r = 0.3＆ r = 0.5，而近阈值区域的顺序显示相反。在接近阈值区中，CFCP速率随着应力比R的增加而增加。基于所提出的腐蚀钝化 - 断裂模型和弹性断裂力学，H2S溶液中S135钢的CFCP速率表达是（DA / DN） （CF）= 1.927 x 10（-9）[Delta K - 6.15（1 - R）（0.59）] 2，可用于预测实际工程中的CFCP寿命。裂缝分析结果表明，H2S溶液中S135钢的CFCP主要由阳极溶解和氢脆控制。

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