Heat treatment of pulsed Nd: YAG laser welds in a Ti-14. 8 wt % Al-21. 3 wt % Nb titanium aluminide

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5451664

Baeslack, III, W. A.; Cieslak, M. J.; Headley, T. J. ^[1]

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1. 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 Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5451664
• Report Number(s): SAND-89-1764C; CONF-8905118-13; ON: DE90003484
• Resource Relation: Conference: 2. international conference on trends in welding research, Gatlinburg, TN (USA), 15-19 May 1989
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
WELDED JOINTS
HEAT TREATMENTS
ALUMINIUM COMPOUNDS
FRACTURES
LASER WELDING
MECHANICAL PROPERTIES
MICROSTRUCTURE
TEMPERATURE EFFECTS
TITANIUM COMPOUNDS
CRYSTAL STRUCTURE
FABRICATION
FAILURES
JOINING
JOINTS
TRANSITION ELEMENT COMPOUNDS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties