A Transmission Electron Microscopy examination of the effect of post-weld heat treatment on spot welded Ti-14Al-21Nb
| Autor: | B. Radhakrishnan, V. L. Acoff, G.M. Janowski, R. G. Thompson, R. D. Griffin |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Proceedings, annual meeting, Electron Microscopy Society of America. 49:610-611 |
| ISSN: | 2690-1315 0424-8201 |
| DOI: | 10.1017/s0424820100087367 |
| Popis: | Titanium aluminides have great potential in structural, aerospace, and high temperature engineering applications. In the majority of these uses, it is expected fusion welding will be used as the primary method of joining. However, control of the as-welded microstructure (and mechanical properties) is difficult to obtain since cooling rates and, therefore, the microstructures can vary considerably.Samples of 14.2 Al, 21.3 Nb, 0.018 C, 0.05 Fe, 0.012 N, 0.013 H, and 0.10 O (in wt.%), commonly known as Ti-24Al-11Nb (in at.%), were placed on a copper block and spot welded inside of a Iucite box using a gas tungsten arc welder (GTAW). The specimens were then sealed in argon backfilled fused quartz tubes and heat treated in the α2, + B2 field of the phase diagram. The conditions of this post-weld heat treatment (PWHT) were 982°C for 0.5, 1, 2, or 4 hours. Transmission electron microscopy and microhardness tests were used to characterize the alloy. |
| Databáze: | OpenAIRE |
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