Corrosion and corrosion fatigue of AISI 420C (X46Cr13) at 60 °C in CO2-saturated artificial geothermal brine |
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| Affiliation: | 1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;2. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China;1. TWI Ltd, Granta Park, Great Abington, CB21 6AL, U.K.;2. PETROBRAS R&D Centre - CENPES, Av. Horácio Macedo 950, Cidade Universitária/Ilha do Fundão, Rio de Janeiro, 21.941-915, Brazil |
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| Abstract: | The lifetime reduction of cyclically loaded AISI 420C (X46Cr13, 1.4034) constantly exposed to highly corrosive CO2-saturated hot thermal water is demonstrated in in situ-laboratory experiments (60 °C, brine: Stuttgart Aquifer, flowing CO2: 30 L/h). S–N plots, micrographic-, phase-, fractographic- and surface analysis were applied to obtain sustainable information on the corrosion and corrosion fatigue behavior. Maximum number of cycles (here 12.5 × 106 cycles to failure) is reached at σa = 173 MPa. Hydroxide and siderite layers were found on pits and crack surfaces. No typical fatigue limit exists and pit corrosion prior to crack initiation may be identified as failure cause. |
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