Heat treatment of pulsed Nd: YAG laser welds in a Ti-14. 8 wt % Al-21. 3 wt % Nb titanium aluminide
- Ohio State Univ., Columbus, OH (USA). Dept. of Welding Engineering
The influence of postweld heat treatment (PWHT) on the structure, mechanical properties and fracture characteristics of pulsed, Nd: YAG laser welds in a Ti-14.8 wt % Al-21.3 wt % Nb titanium aluminide has been investigated. Significant microstructure variations within the fusion zone (FZ) of all heat-treated welds were attributed primarily to the influence of local compositional fluctuations on decomposition of the metastable-{beta} microstructure present in the as-welded FZ. An increase in PWHT temperature promoted a decrease in the maximum FZ hardness and an increase in the longitudinal-weld bend ductility. Correspondingly, the proportion of ductile tearing to cleavage fracture within the FZ increased with an increase in PWHT temperature. 8 refs., 6 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5451664
- Report Number(s):
- SAND-89-1764C; CONF-8905118--13; ON: DE90003484
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALUMINIUM COMPOUNDS
CRYSTAL STRUCTURE
FABRICATION
FAILURES
FRACTURES
HEAT TREATMENTS
JOINING
JOINTS
LASER WELDING
MECHANICAL PROPERTIES
MICROSTRUCTURE
TEMPERATURE EFFECTS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WELDED JOINTS
WELDING