|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Enhanced corrosion resistance of 316LN stainless steel fabricated by rotationally accelerated shot peening
||Bin Yang, Xudong Chen, Yuntian Zhu, Yusheng Li
|On-Site Speaker (Planned)
Pioneering studies have shown that nanocrystals and twin boundaries in the gradient structure layer help the corrosion resistance of a stainless steel. However, greater roughness, microstrain and cracks produced by surface mechanical attrition treatment prevent the formation of a faultless passive film and thus reduce the corrosion resistance of the steel.
In this work, rotationally accelerated shot peening (RASP) technology was used to produce nanocrystallines and twins on the surface of 316LN stainless steel. Electrochemical corrosion experiments were carried out on the RASP-processed specimens in the 3.5wt% NaCl solution. Improved passivity and better electronic properties of the passive films were observed on the RASP-processed specimens. The experimental results showed that the structure with nanocrystallines and a high density of twins can provide more nucleation sites, adhesion work and homogeneous capillary force to improve the uniformity and compactness of the passive film, resulting in a better corrosion resistance.
||Nanotechnology, Iron and Steel, Surface Modification and Coatings