Reconstruction Mechanism of Surface Integrity for Laser Additive Manufactured 316 L Stainless Steel Subjected to Ultrasonic Surface Rolling Process: Numerical Simulation and Experimental Verification

• Published in: Metals and materials international Vol. 30; no. 10; pp. 2745 - 2756
• Main Authors: Xu, Qingzhong, Yang, Xiao, Liu, Junjie, Qiu, Zhihao, Li, Gen
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.10.2024; Springer Nature B.V; 대한금속·재료학회
• Subjects: Austenitic stainless steels; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compressive properties; Deformation; Engineering Thermodynamics; Grain refinement; Heat and Mass Transfer; High strain rate; Integrity; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Microhardness; Numerical models; Plastic deformation; Processes; Reconstruction; Residual stress; Skin pass rolling; Solid Mechanics; Stainless steel; Static pressure; Strain hardening; Surface properties; Surface roughness; Tensile stress; 재료공학; Surface integrity; Ultrasonic surface rolling process; Reconstruction mechanism; 316L stainless steel; Laser additive manufacturing
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-024-01683-z

The ultrasonic surface rolling process (USRP) is a strengthening process to improve the surface properties and enhance the mechanical performances of metal materials based on severe plastic deformation and high strain rates. In this study, a three-dimensional numerical model was established to investigate the reconstruction mechanism of surface integrity for the laser additive manufactured 316 L stainless steel (LAMed 316 L) subjected to USRP. The accuracy of the USRP model was confirmed by experimental results of residual stress, microhardness, and surface roughness. The results showed that the static pressure played a crucial role in causing the plastic deformation and strain hardening, followed by the decreased surface roughness, improved microhardness, and induced compressive residual stresses. The introduction of ultrasonic high-frequency impact with the smaller force contributed to the high strain rate plastic deformation and the surface tensile stress release, and improved the plastic deformation efficiency greatly. The reconstructed surface integrity of LAMed 316 L was attributed to the plastic strain, strain hardening, and grain refinement. Graphical Abstract