予損傷を受けた単結晶Ni基超合金におけるセル状変質域生成と高温疲労強度への影響(<特集>高温強度)

概要

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In order to get fundamental understanding to establish the refurbishment technology for advanced gas turbines, the nucleation of cellular colonies in a single crystal Ni-base superalloy, CMSX-4, was studied, supposing the case in which the material was subjected to damage associated with local plastic deformation, followed by the re-heat treatments. During the syudy special attention was paid to get basic understandings on it. The experimental evidences indicated that the cellular colonies were originated and developed from the damaged region, being influenced by the following many factors : the strain field by the local plastic deformation, the re-heat treatment temperature, and the microsegregation in the material. It were also shown that the cellular colonies was actually produced inside the material subjected to fatigue and thermo-mechanical fatigue damages. Furthermore, the effect of the local cellular colonies on the high temperature fatigue strength was experimentally quantified.
社団法人日本材料学会の論文
2001-02-15