Texture and precipitation behavior of friction stir welded Inconel 825 alloy

Journal Article · Mon Nov 30 23:00:00 EST 2020 · Materials Today Communications

DOI:https://doi.org/10.1016/j.mtcomm.2020.101295· OSTI ID:1639320

Das, Hrishikesh ^[1]; Mondal, Mounarik ^[2]; Hong, Sung-Tae ^[2]; Lee, Ji-Woo ^[3]; Cho, Hoon-Hwe ^[3]

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1. BATTELLE (PACIFIC NW LAB)
2. University of Ulsan, South Korea
3. Hanbat National University

The microstructure, texture pattern, and precipitation behavior of friction stir butt welded Inconel 825 alloy are highlighted here. The microstructure of bright regions and black-banded regions in the stir zone (SZ) is characterized by SEM, EBSD, and TEM with EDS. EBSD analysis justifies that the SZ exhibits a dynamic recrystallized structure. Grain boundary mapping corroborates the insignificant difference in the low- and high-angle grain boundaries fraction between the SZ, the thermo-mechanically affected zone, and the base metal. TEM analysis confirms the formation of nano twins and dispersion of nano-size precipitations in the grains, and at the grain boundaries as well. Grain refinement and nano-size precipitation formation in the SZ significantly enhanced both microhardness and tensile strength.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1639320
• Report Number(s): PNNL-SA-153372
• Journal Information: Materials Today Communications, Journal Name: Materials Today Communications Vol. 25
• Country of Publication: United States
• Language: English