Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding
Nickel based alloys of the type Hastelloy-N™ are ideal candidate materials for molten salt reactors, as well as for applications such as pressure vessels, due to their excellent resistance to creep, oxidation and corrosion. In this work, the authors have attempted to understand the effects of welding on the morphology, chemistry and crystal structure of the precipitates in the heat affected zone (HAZ) and the weld zone of a Ni–Cr–Mo–Fe–Si alloy similar to Hastelloy-N™ in composition, by using characterization techniques such as scanning and transmission electron microscopy. Two plates of a Ni–Cr–Mo–Fe–Si alloy GH-3535 were welded together using a TiG welding process without filler material to achieve a joint with a curved molten zone with dendritic structure. It is evident that the primary precipitates have melted in the HAZ and re-solidified in a eutectic-like morphology, with a chemistry and crystal structure only slightly different from the pre-existing precipitates, while the surrounding matrix grains remained unmelted, except for the zones immediately adjacent to the precipitates. In the molten zone, the primary precipitates were fully melted and dissolved in the matrix, and there was enrichment of Mo and Si in the dendrite boundaries after solidification, and re-precipitation of the complex carbides/silicides at some grain boundaries and triple points. The nature of the precipitates in the molten zone varied according to the local chemical composition. - Graphical abstract: Display Omitted - Highlights: • Ni-based alloy with Cr, Mo, Si, Fe and C was welded, examined with SEM, EBSD, and TEM. • Original Ni{sub 2}(Mo,Cr){sub 4}(Si,C) carbides changed from equiaxed to lamellar shape in HAZ. • Composition and crystal structure remained almost unchanged in HAZ. • Original carbides changed to lamellar Ni{sub 3}(Mo,Cr){sub 3}(Si,C) in some cases in weld metal. • Precipitates were mostly incoherent, but semi-coherent in some cases in weld metal.
- OSTI ID:
- 22476117
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 105; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
Similar Records
Grain boundary melting and hot cracking in weld HAZ of a two-phase Ni{sub 3}Al alloy containing Zr
Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy
Related Subjects
ALLOY SYSTEMS
BACKSCATTERING
CARBIDES
CHROMIUM COMPOUNDS
CORROSION
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
EUTECTICS
GRAIN BOUNDARIES
HASTELLOY N
IRON COMPOUNDS
MOLYBDENUM COMPOUNDS
NICKEL COMPOUNDS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SILICIDES
SILICON ALLOYS
SPECTROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
WELDED JOINTS