Insight into the stress corrosion cracking of HP-13Cr stainless steel in the aggressive geothermal environment

The stress corrosion cracking of HP-13Cr stainless steel in the geothermal environment was studied by experimental measurements and modeling calculations. The stress corrosion cracking susceptibility of HP-13Cr stainless steel increases with both temperature and CO2 pressure, and shows a synergistic effect greater than the temperature or CO2 pressure does singly. The fracture morphologies presented quasi-cleavage fracture characteristic in the geothermal environment. The stress corrosion cracking mechanism is dominated by the anodic process. The critical stress intensity factor for stress corrosion cracking was measured and the pitting-tocracking process was clarified by a mechanism model.

Automated summary

The stress corrosion cracking susceptibility of HP-13Cr stainless steel increases with temperature and CO2 pressure in a geothermal environment, showing a synergistic effect. Fracture morphologies mainly exhibit quasi-cleavage characteristics in the geothermal environment, with the stress corrosion cracking mechanism being dominated by the anodic process.