Notched tensile strength of SP-700 laser welds
- 作者：L.W. Tsay ; Y.S. Ding ; W.C. Chung ; C. Chen
- 关键词：Notched tensile strength ; Laser welding ; Ti-4.5Al-3V-2Mo-2Fe ; Ti-6Al-4V
- 刊名：Materials Letters
- 出版年：2008
- 期刊代码：59_0167577x
- 类别：ms
- 出版时间：15 March 2008
- 卷：62
- 期：6-7
- 页码：1114-1117
- 文件大小：1270 K
摘要
Notched tensile tests were performed to evaluate the influence of post-weld heat treatments (PWHTs) on the notched tensile strength (NTS) of two α + β titanium alloy welds. The results indicated that SP-700 laser welds were notch brittle unless a high PWHT temperature, e.g. 760 °C, was applied. The lowest NTS was associated with the peak-aged weld, which was aged at 482 °C for 1 h. In contrast, Ti-6Al-4V welds did not exhibit notch sensitivity in the as-welded or in the PWHT conditions. The reduced plasticity due to the strengthening of fine α in the β matrix account for the observed notch brittleness of the SP-700 laser welds. Increasing the PWHT temperature associated with coarsening the α + β structure reduced the notch sensitivity of SP-700 laser welds.