Effects of Shot Peening on Surface Mechanical Properties of Duplex Stainless Steel

摘要

Shot peening is a frequently used mechanical treatment to modify surface conditions of materials. The influence of shot peening on surface yield strength of S32205 duplex stainless steel has been investigated using X-ray stress analysis. Proof stresses σ_(0.2) of both ferrite and austenite in the surface are enhanced after shot peening. Improvement on mechanical properties of modified surface was due to fine domain, high value of dislocation density induced by shot peening. Increment of proof stress σ_(0.2) in austenite is larger than that of ferrite at same condition of SP, which is attributed to the easier domain size subdivision that is characterized by a higher harden-ability in austenite.