http://scholars.ntou.edu.tw/handle/123456789/4689
Title: | Notched tensile fracture of Ti-4.5Al-3V-2Fe-2Mo welds at elevated temperatures | Authors: | L.W. Tsay C.L. Hsu C. Chen |
Keywords: | Ti–4.5Al–3V–2Fe–2Mo;Notched tensile strength;Post-weld heat treatment;Microstructure;Fracture | Issue Date: | 15-Apr-2010 | Journal Volume: | 120 | Journal Issue: | 2-3 | Start page/Pages: | 715-721 | Source: | Materials Chemistry and Physics | Abstract: | Notched tensile tests of Ti–4.5Al–3V–2Fe–2Mo welds with distinct post-weld heat treatments (PWHTs) were carried out at 150, 300, and 450 °C. The results were also compared with those of mill-annealed base metal (the MB specimen) tested at the same conditions. The as-welded (AW) specimen exhibited notch brittleness even when tested at 450 °C, partly due to a fast age-hardening response at the test temperature. In contrast, the weld with PWHT at 482 °C exhibited severe notch brittleness at room temperature but showed an increase in strength and ductility as the temperature increased. In general, the weld with PWHT at 704 °C (the W-704 specimen), AW and MB specimens displayed reduced notched tensile strength (NTS) with increasing temperature. At elevated temperatures, the W-704 specimen with coarse α + β structures in a basket-weave form also demonstrated superior NTS to the MB specimen with banded α + β structures. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4689 | ISSN: | 0254-0584 | DOI: | 10.1016/j.matchemphys.2009.12.034 |
Appears in Collections: | 光電與材料科技學系 |
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