Abstract
Creep rupture and fatigue properties of transient liquid phase (TLP) bonded joints of Ni base single crystal superalloy, CMSX-2, were investigated using MBF-80 insert metal. CMSX-2 was bonded at 1523 K for 1.8 ks in vacuum, which was determined as the optimum bonding condition. The (100) orientation of a bonded specimen was aligned perpendicular to the joint interface. The creep rupture strength and rupture lives of all joints were almost identical to those of the base metal. Elongation and reduction area values of joints were comparable to those of base metal, while creep rupture at high temperature was worsened. The low cycle fatigue properties of all joints were also the same as those of base metal. SEM observation of the fracture surfaces of joints after creep rupture tests revealed that the fracture surfaces were classified into three regions, and that the elongation and reduction of area values decreased sharply with increase in the area fraction of interfacial fracture surface.
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