Effect of shot peening on surface characteristics and high-temperature corrosion behaviour of super 13Cr martensitic stainless steel

• DOI: 10.1016/j.jmrt.2024.07.152
• Publication Date: 2024-07-23T16:42:42Z
• Authors: Yan Long; Wenchun Jiang; Jinheng Luo; Junhui Wei; Xiaoyan Wang; Nan Ji; Yujie Fan; Qiang Jin; Xiaoming Liang
• Keywords: Martensitic stainless steel; Equiaxed crystals; Passivation; Severe Plastic Deformation

Super 13Cr, as an economy stainless steel (SS) for oil country tubular goods, needs stable corrosion resistance in high-pressure and high-temperature (HPHT) downhole medium. Severe plastic deformation (SPD) are the surface modification technology to improve mechanical properties, fatigue behavior of metals, shot peening (SP) has been most widely used SPD process. However, there quite limited studies about microsutructure evolution, residual stress, SP-treated martensitic SS. In this study, super 13Cr SS was treated by SP with various air pressures nozzle speeds. The characteristics behaviour 3.17 mol/L K2HPO4 solution were investigated through finite element model analysis, characterization stress microstructure, well electrochemical cracking (SCC) tests at 160 °C 10 MPa. results showed that could generate high-level compressive microstucture, including nano-sized equiaxed grains, gradient lamellar structure fragmented carbides. Increasing pressure contributed achieve uniform nanocrystalline, but tended high dislocation density defects. improving effect treatment low 0.15 MPa on passivation ability limited, adversely impacted resistance. specimens SCC susceptibility, due introduction more defects, angle grain boundaries, dislocations.