Weldability and Microstructure of Nickel-Silicon Based Alloy
The NiSix based alloy typically has poor weldability due to its lower ductility. A limited amount of work has been performed on the weldability of NiSix based alloys. Therefore, the effect of heat treatment and welding parameters on weldability of the alloys, and the relationship between the weldability and microstructure were studied. The results show that the as-cast Ni-Si-Nb-B alloy (Ni 76.5%, Si 20%, Nb 3%, and B 0.5%) could be successfully welded after preheating at 600 °C. The welding procedure should be performed on the alloys before any heat treatment and a preheating at 600 °C should be used. The fusion zone is harder than the matrix due to a large amount of γ phase and a finer microstructure. The cracks are predominantly intergranular in heat affected zone and associated with the needle-like γ phase. The heat treatment before welding increases the tendency of cracking in the fusion zone.
Q. Liu et al., "Weldability and Microstructure of Nickel-Silicon Based Alloy," Journal of Iron and Steel Research, International, vol. 13, no. 3, pp. 61-67, Elsevier, May 2006.
The definitive version is available at https://doi.org/10.1016/S1006-706X(06)60063-0
Materials Science and Engineering
Keywords and Phrases
Heat Affected Zone; Heat Treatment; Ni3Si Based Alloy; Weldability
International Standard Serial Number (ISSN)
Article - Journal
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