Microstructural characterization of dissimilar welds between alloy 800 and HP heat-resistant steel

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2008.01.013· OSTI ID:21137465

Dehmolaei, R ^[1]; Kermanpur, A ^[1]

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1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111 (Iran, Islamic Republic of)

In this study, dissimilar welds between HP heat-resistant steel and Incoloy 800 were made with four different filler materials including: 309 stainless steel and nickel-based Inconel 82, 182 and 617. The microstructure of the base metals, weld metals and their interfaces were characterized by utilizing optical and scanning electron microscopy. Grain boundaries migration in the weld metals was studied. It was found that the migration of grain boundaries in the Inconel 82 weld metal was very extensive. Precipitates of TiC and M{sub 23}C{sub 6} (M = Cr and Mo) in the Inconel 617 weld metal are identified. The necessary conditions for the formation of cracks close to the fusion line of the 309-HP joints are described. Furthermore unmixed zone near the fusion line between HP steel base metal and Inconel 82 weld metal is discussed. An epitaxial growth is characterized at the fusion line of the 309-Alloy 800 and Inconel 617-Alloy 800 joints.

• OSTI ID: 21137465
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 10 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACKS
EPITAXY
FILLERS
GRAIN BOUNDARIES
HEAT
INCOLOY 800
INCONEL 617
INCONEL 82
MIGRATION
SCANNING ELECTRON MICROSCOPY
STAINLESS STEEL-309
TITANIUM CARBIDES
WELDABILITY
WELDED JOINTS