A Comprehensive Numerical Approach for Analyzing the Residual Stresses in AISI 301LN Stainless Steel Induced by Shot Peening

Abstract

Shot peening is one of the most famous mechanical surface treatments to improve fatigue performance of metallic components, which is attributed to high amplitude compressive residual stresses. A numerical approach is developed to analyze the residual stresses in 301LN metastable austenitic stainless steel by shot peening. The material behavior is described by a proposed constitutive model in which strain-induced martensitic transformation, isotropic hardening and kinematic hardening effects are taken into account properly. Both single shot and random multiple shots peening were simulated and analyzed. A numerical method is presented with the Python programming language to make the multiple shots follow a random probability distribution. Results demonstrate that the simulated equivalent plastic strains and martensitic volume fractions agree well with the experimental ones, which verify the validity of the constitutive model. Besides, the numerical method is effective at achieving a realistic surface coverage. The maximum compressive residual stress by the Johnson–Cook model is 12% higher than that of the proposed model. Additionally, each hardening effect has an effect on the simulated residual stress. The developed numerical approach can provide a feasible simulation of the shot-peening process and makes an accurate prediction of the residual stress field in 301LN steel.

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

“…Finally, the residual stresses after shot peening presented S-shaped distribution along the thickness direction. The similar trend was observed in shot peening simulation of steel, in work by Dieng et al [ 21 ], Zhou et al [ 27 ], and Wu et al [ 29 ]. The literature indicated that the surface compressive stresses were introduced by the elastic deformation, whereas the internal compressive stresses were introduced by the plastic deformation, and their magnitudes were mainly related to the material being shot peened [ 23 ].…”

“…The results indicated that the residual compressive stresses are proportional to the shot peening speed, and the compressive stress depth increases with the increase of coverage. Zhou et al [ 27 ] proposed a numerical method to analyze the residual stresses introduced by shot peening, and the experiment verified the validity of the model. Liu et al [ 28 ] used SPH method to simulate shot peening to eliminate welding residual stresses.…”

Overview of Surface Modification Strategies for Improving the Properties of Metastable Austenitic Stainless Steels

“…Various surface modification techniques can be employed to enhance the properties of 301LN. SP has a positive impact by inducing a compressive stress layer that improves its fatigue strength, wear resistance, and resistance to stress corrosion cracking [161,162]. These effects make SP a valuable surface modification technique for enhancing the mechanical performance and durability of 301LN components [163].…”

MULTI-PHASE NANOSTRUCTURED 60Si2Mn DISC SPRING BY A NOVEL AUSTEMPERING PROCESS

“…However, not all disc spring manufacturers quality controls for the steels they use, or cover the product cost of alloying. The other approach of great interest is to produce residual compressive stress in the surface by shot peening [9]- [11]. However, there are some adverse effects on the fatigue strength caused by excessive shot peening, such as an increase in surface roughness and an uncontrollable stress distribution in disc spring surface [12], [13].…”