.GAMMA./.GAMMA.' Microstructural Changes Induced by Monotonic and Cyclic Loadings in a Single Crystal Ni-Base Superalloy

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  • 単調負荷および繰返し負荷により生じる単結晶Ｎｉ基超合金のγ／γ’組織形態変化
  • タンチョウ フカ オヨビ クリカエシ フカ ニ ヨリ ショウジル タンケッショウ Niキ チョウゴウキン ノ ガンマ ガンマ ソシキ ケイタイ ヘンカ
  • γ/γ' Microstructural Changes Induced by Monotonic and Cyclic Loadings in a Single Crystal Ni-Base Superalloy

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Abstract

This paper focused on microstructural changes in a single crystal Ni-base superalloy, CMSX-4, induced by external loadings. It was shown by a series of experiments that an application of the monotonic straining at R.T. and the subse-quent heat treatment at high temperature resulted in a directional coarsening of γ/γ' microstructure, similar to “rafted structure” by creep. A critical strain was found to be needed to build up the microstructural change. The coarsening direc-tions were significantly depending on the histories of straining. Not only monotonic but also cyclic loadings at R.T. and elevated temperatures could induce the similar changes in microstructure. These series of experimental works provide us a new method for failure and damage analysis of superalloy components.

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