Fracture Mechanism in Fatigue of Ni-Base Superalloy Inconel 718 at Elevated Temperatures

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  • Ｎｉ基超合金インコネル７１８の中高温疲労における破壊機構
  • Niキ チョウゴウキン インコネル 718 ノ チュウコウオン ヒロウ ニ オケル ハカイ キコウ

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Abstract

In order to investigate the fracture mechanism in fatigue of Ni-base superalloy at elevated temperatures, rotating bending fatigue tests were carried out for Inconel 718 at 500°C and 600°C up to 108 cycles. At both temperatures, fracture occurred from a subsurface of the specimen in long life region, though the origin of fracture was the specimen surface in short life region. Consequently, S-N curves showed a two-step shape in elevated temperature tests. Although a surface crack was observed similar to the result at room temperature even in long life region at elevated temperatures, the surface crack stopped propagating. In this case, interganular cracks were observed at an origin of subsurface fracture. The subsurface damage was initiated at the early stage of fatigue life.

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