Application of Melt-Spun Superalloy Ribbons to Solid Phase Diffusion Welding for Ni-Base Superalloy

Yasuda, Ken; Kobayashi, Masaru; Okayama, Akira; Kodama, Hideyo; Funamoto, Takao; Suwa, Masaki

doi:10.7449/1988/superalloys_1988_765_774

Cited by 1 publication

(1 citation statement)

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“…The welding boundary with misorientation angle is similar to grain boundaries [4]. These boundaries are preferential heterogeneous nucleation sites for precipitates due to their high diffusion mobility, and the corresponding mechanical properties of materials and components would be affected [5][6][7]. To date, research on microstructure stability of boundaries with certain misorientation angle at service temperature is still limited.…”

Section: Introductionmentioning

confidence: 99%

Misorientation effect of grain boundary on the formation of discontinuous precipitation in second and third generation single crystal superalloys

Ding

Zheng

et al. 2014

MATEC Web of Conferences

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Abstract.[001] tilt artificial grain boundaries of Ni-based single crystal superalloys CMSX-4 and DD10 have been prepared by self-diffusion bonding. The microstructural stability of 0 ∼ 30 • artificial grain boundaries have been investigated after heat treatment at 1100 • C for 0 ∼ 300 h. TCP phases and cellular colony developed on boundaries are related to misorientation angle of the bonded boundaries of DD10 and DD10 alloys as well as the bonded boundaries of CMSX-4 and DD10 alloys. The heterogeneous nucleation of TCP phase, enveloped by γ film, occurred along 15 • and 20 • boundaries. Discontinuous Precipitation (DP) reaction occurred along high misorientation angle (20 • ∼ 30 • ) boundaries. However, no TCP phase formation existed along grain boundaries with different misorientation angles in CMSX-4/CMSX-4 bonded alloys as well as for a 0 • boundary in DD10/DD10 and CMSX-4/DD10 bonded alloys. The current study clearly suggests that grain boundary precipitation and its morphology were influenced by the misorientation angle of grain boundary and the content of refractory elements in alloy.

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Section: Introductionmentioning

confidence: 99%