http://scholars.ntou.edu.tw/handle/123456789/4693
標題: | The Effect of Preheating on Notched Tensile Strength and Impact Toughness of Ti-6Al-6V-2Sn Laser Welds | 作者: | Leu-Wen Tsay Yun-Chen Jiang Chun Chen |
關鍵字: | notched tensile strength;impact toughness;titanium-6 aluminum-6 vanadium-2 tin;laser welding | 公開日期: | 三月-2011 | 卷: | 52 | 期: | 3 | 起(迄)頁: | 406-411 | 來源出版物: | Materials Transactions | 摘要: | Notched tensile strength (NTS) and impact toughness were determined for Ti-6Al-6V-2Sn laser welds subjected to post-weld heat treatment (PWHT) at distinct temperatures. In this study, the specimens were either preheated at 300°C or maintained at room temperature before laser welding. The preheated weld, associated with a reduced cooling rate, had obviously lower hardness than the non-preheated weld in the as-welded condition. After PWHT at 482°C for 3 h, the preheated weld also exhibited considerably lower hardness than the non-preheated weld. In general, preheating at 300°C could effectively increase the NTS and impact toughness of Ti-6Al-6V-2Sn laser welds. The preheated weld in the as-welded condition had superior NTS to other welds being tested. On the other hand, the welds after PWHT at 704°C possessed the best resistance to unstable impact fracture, regardless of preheating. Usually, the coarse α+β structures together with intergranular α were responsible for the high NTS and impact toughness of the weld. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4693 | ISSN: | 1345-9678 | DOI: | 10.2320/matertrans.M2010281 |
顯示於: | 光電與材料科技學系 |
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