Initial Development in Joining of ODS Alloys Using Friction Stir Welding

Technical Report · Wed Aug 01 00:00:00 EDT 2007

DOI:https://doi.org/10.2172/1093012· OSTI ID:1093012

Ren, Weiju ^[1]; Feng, Zhili ^[1]

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1. ORNL

Solid-state welding of oxide-dispersion-strengthened (ODS) alloy MA956 sheets using friction stir welding (FSW) was investigated. Butt weld was successfully produced. The weld and base metals were characterized using optical microscopy, scanning electronic microscopy, transmission electronic microscopy, and energy dispersion x-ray spectrum. Microhardness mapping was also conducted over the weld region. Analyses indicate that the distribution of the strengthening oxides was preserved in the weld. Decrease in microhardness of the weld was observed but was insignificant. The preliminary results seem to confirm the envisioned feasibility of FSW application to ODS alloy joining. For application to Gen IV nuclear reactor heat exchanger, further investigation is suggested.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1093012
• Report Number(s): ORNL/TM-2006/615; AF3610300; NEAF265
• Country of Publication: United States
• Language: English