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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51655

Title: Fatigue behavior and microstructural characteristics of a duplex stainless steel weld metal under vibration-assisted welding
Authors: Yu-Ting Tsai
Po-Chiang Lin
Yu-Wen Chen
Shing-Hoa Wang
Jer-Ren Yang
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Keywords: Duplex stainless steel
Fatigue
Dislocation structure
Transmission electron microscopy
Vibration-assisted welding
Date: 2018-04
Issue Date: 2018-12-14T03:38:16Z
Publisher: Materials Science and Engineering A
Abstract: Abstract: The fatigue behavior and dislocation structures of SAF 2507 alloy were investigated. Specifically, as-received superduplex stainless steel SAF 2507 (AS) alloy and its weld metals from direct current welding without and with electrodynamic vibration (VIB) were studied. Fatigue experiments were conducted at total strain amplitudes of 1.2% and 2.4% (R = −1), respectively; the VIB samples exhibited higher strength but shorter fatigue lives. In the fatigued AS sample, ferrite exhibited characteristic dislocation structures, namely veins, walls, and cells, and austenite had persistent Lüders bands (PLBs) and mechanical twins. In the fatigued weld metals, the dislocation structures in austenite exhibited only PLBs; however, in ferrite, two types of walls formed due to entanglement of dislocations and rearrangement of Cr2N dislocation bundles, indicating that the fatigue strains are accommodated mostly by ferrite. The shorter fatigue lives of the VIB samples are attributed to the increased amount of intragranular austenite, and increased boundaries between intragranular austenite and δ-ferrite result in faster dislocation entanglement. Consequently, the initial response stress was the highest and work hardening rate was higher, which eventually induced cracks in δ-ferrite.
Relation: 721 pp.319-327
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51655
Appears in Collections:[機械與機電工程學系] 期刊論文

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