Effects of Ultrasonic Nanocrystal Surface Modification on the Residual Stress, Microstructure, and Corrosion Resistance of 304 Stainless Steel Welds

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 49; no. 3; pp. 972 - 978
• Main Authors: Ye, Chang, Telang, Abhishek, Gill, Amrinder, Wen, Xingshuo, Mannava, Seetha R., Qian, Dong, Vasudevan, Vijay K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2018; Springer Nature B.V
• Subjects: Austenitic stainless steels; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compressive properties; Corrosion resistance; Corrosion resistant steels; Corrosion tests; Joint strength; Materials Science; Metallic Materials; Microstructure; Nanocrystals; Nanotechnology; Residual stress; Structural Materials; Surfaces and Interfaces; Tensile stress; Thin Films; Welded joints
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-017-4451-9

In this study, ultrasonic nanocrystal surface modification (UNSM) of 304 stainless steel welds was carried out. UNSM effectively eliminates the tensile stress generated during welding and imparts beneficial compressive residual stresses. In addition, UNSM can effectively refine the grains and increase hardness in the near-surface region. Corrosion tests in boiling MgCl
2
solution demonstrate that UNSM can significantly improve the corrosion resistance due to the compressive residual stresses and changes in the near-surface microstructure.