Materials Transactions Online

Materials Transactions, Vol.48 No.09 (2007) pp.2319-2323
© 2007 The Japan Institute of Metals

Characterization and Mechanism of 304 Stainless Steel Vibration Welding

Che-Wei Kuo, Chi-Ming Lin, Gen-Huey Lai, Yu-Che Chen, Yung-Tse Chang and Weite Wu

National Chung Hsing University, Institute of Materials Science and Engineering, 250 Kuo Kuang Road, Taichung 402, Taiwan, R. O. China

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.

(Received 2007/2/9; Accepted 2007/4/16; Published 2007/8/25)

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

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