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|標題:||Characterization and mechanism of 304 stainless steel vibration welding||作者:||Kuo, C.W.
|關鍵字:||vibration welding;delta-ferrite;X-ray diffraction;residual stress;grain refining;stress relief;solidification||Project:||Materials Transactions||期刊/報告no：:||Materials Transactions, Volume 48, Issue 9, Page(s) 2319-2323.||摘要:||
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 delta-ferrite structure, uniform composition distribution, less residual stress and less delta-ferrite content relative to the weld without vibration. The results illustrate that the vibration reduces the micro supercooling and improves the nucleation of delta-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.
|Appears in Collections:||材料科學與工程學系|
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