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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.9 (2007)  >  pp.2319-2323

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Characterization and Mechanism of 304 Stainless Steel Vibration Welding

Che-Wei Kuo1), Chi-Ming Lin1), Gen-Huey Lai1), Yu-Che Chen1), Yung-Tse Chang1) and Weite Wu1)
1) National Chung Hsing University, Institute of Materials Science and Engineering

Gas tungsten arc welding (GTAW) was performed on AISI 304 stainless steel; steady-state vibration was produced by a mass-eccentric motor. The vibration weld shows a very small δ-ferrite structure, uniform composition distribution, less residual stress and less δ-ferrite content relative to the weld without vibration. The results illustrate that the vibration reduces the micro supercooling and improves the nucleation of δ-ferrite to form a grain refined structure. Vibration-induced stacking faults are identified as the major cause of the line broadening of X-ray diffraction profile. Correlating the literature and the result in the study, the mechanism of vibratory stress relief can be represented as the breakdown of dislocation into a pair of partial dislocations. This mechanism can comprehensively explain all the phenomena that take place during vibratory stress relief.

vibration welding, δ-ferrite, X-ray diffraction, residual stress, grain refining

Received: February 09, 2007
Accepted: April 16, 2007 , Published online: August 25, 2007
Copyright (c) 2007 The Japan Institute of Metals



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