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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23719

Title: The Effect of Preheating on Notch Fracture of Ti-4.5Al-3V-2Fe-2Mo Laser Welds
Authors: Leu-Wen Tsay;Yun-Chen Jiang;Chun Chen
Contributors: NTOU:Institute of Materials Engineering
國立臺灣海洋大學:材料工程研究所
Keywords: notched tensile strength;titanium-4.5aluminum-3vanadium-2iron-2molybdenum;laser welding
Date: 2009
Issue Date: 2011-10-20T08:07:29Z
Publisher: Materials Transactions(The Japan Institute of Metals)
Abstract: Abstract:Notched tensile strength (NTS) and impact fracture toughness were determined for Ti-4.5Al-3V-2Fe-2Mo laser welds subjected to post-weld heat treatment (PWHT) at distinct temperatures. In the welding process, the specimens were preheated at 300°C to reduce the cooling rate of the welds, and the results were compared with the non-preheated welds. Generally, the preheated welds had coarser α+β structures and showed slower responses to age-hardening in PWHTs than the non-preheated welds. The decreased hardness and accompanied ductility enhancement resulted in the improved notch brittleness and impact toughness of the preheated welds, relative to the non-preheated welds. As the PWHT temperature of the welds increased, the coarsening of grain boundary α assisted grain boundary sliding and formed intergranular dimple fractures on the fracture surface.
Relation: 50(10), pp.2396-2402
URI: http://ntour.ntou.edu.tw/handle/987654321/23719
Appears in Collections:[材料工程研究所] 期刊論文

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