http://scholars.ntou.edu.tw/handle/123456789/4692
標題: | The Effect of Preheating on Notch Fracture of Ti-4.5Al-3V-2Fe-2Mo Laser Welds | 作者: | Leu-Wen Tsay Yun-Chen Jiang Chun Chen |
關鍵字: | notched tensile strength;titanium-4.5aluminum-3vanadium-2iron-2molybdenum;laser welding | 公開日期: | 十月-2009 | 卷: | 50 | 期: | 10 | 起(迄)頁: | 2396-2402 | 來源出版物: | Materials Transactions | 摘要: | 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4692 | ISSN: | 1345-9678 | DOI: | 10.2320/matertrans.M2009141 |
顯示於: | 光電與材料科技學系 |
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