Study on transient liquid insert metal diffusion bonding of Ni-base superalloys (Part 5). Analysis to reduction of mechanical properties in transient liquid insert metal diffusion bonding Joint.

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 classi ed into three regions, and that the elongation and reduction of area values decreased sharply with increase in the area fraction of interfacial fracture surface.MST/5555

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Crystalline Controlled Filling Repairing Technique Utilizing Isothermal Solidification

Fujita¹,

Saida²,

Kusano³

et al. 2007

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Ni-base single crystal superalloy CMSX-4 has been widely used for turbine blades and vanes because of its superior heat-resistance. However, since they are usually used under severe environments, cracks sometime occur. Since this material is so expensive, there exists strong demand for repairing technique which enables to form singlecrystal in the repaired region to prevent deterioration of fatigue resistance. Therefore, in this study, the applicability of repairing technique utilizing iso-thermal solidification treatment with using Ni-Cr-B and Ni-Cr-Si alloys as filler metals to cracks occurred in single crystal superalloy CMSX-4 was investigated. The microstructure and crystal orientaion in the repaired regions under various heat treatment conditions were examined by SEM and EBSP. SEM and EBSP analyses have revealed that isothermal solidification and single-crystallization in the repaired region was achieved by repairing with using Ni-4Cr-2.5B filler metal under the condition of 1448K×176.4ks.The same result could be obtained also by using Ni-4Cr-10Si filler metal under the condition of 1473K×90ks. Creep rupture test for the repaired regions with Ni-4Cr-2.5B and Ni-4Cr-10Si filler metals has shown that the creep rupture strentgh of repaired region with Ni-4Cr-10Si filler metal reached about 2/3 of that of the base metal.

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Study on transient liquid insert metal diffusion bonding of Ni-base superalloys (Part 5). Analysis to reduction of mechanical properties in transient liquid insert metal diffusion bonding Joint.

Cited by 4 publications

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Crystalline controlled build-up repairing utilizing unidirectional solidification

Crystalline controlled build-up repairing utilizing unidirectional solidification

Creep rupture and fatigue properties of transient liquid phase bonded joints of Ni base single crystal superalloy

Crystalline Controlled Filling Repairing Technique Utilizing Isothermal Solidification

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