New vision of convection induced freckle formation theory in nickel-based superalloys by electron microscopy
Shuai Wang,
Yuliang Jia,
Yongzhe Wang
et al.
Abstract:Freckles, one of the common defects in blades used in heavy-duty gas turbines, hugely deteriorate the mechanical properties and liability of blades under service conditions. The thermal-solutal convection theory is a widely adopted formation mechanism, but few solid experimental pieces of evidence have been reported. Here, the grain microstructure in freckle chains taken from four different Nickel-based superalloys with either single-crystal or directionally solidified alloy is analyzed for the first time. The… Show more
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