1001 遮熱コーティングを施した Ni 基超合金の疲労機構について

概要

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The fatigue mechanism of Ni-based supper alloys (IN738LC and IN706) with TBC (ZrO_2-8%Y_2O_3,CoNiCrAlY) was studied using servo pulser fatigue machine. The difference in fatigue characteristic was detected between IN706 and IN738LC. Several cracks initiated in ceramic layer of IN706 and propagted through bond layer. Then, stress concentration occurred at the front of cracks in the interface of IN706. The plastic deformation of IN706 proceeded then IN706 finallyfractured. On the other hand, macroscopic plastic deformation was not detected in IN738LC by optical microscope. The crack stopped at theinterface between the bond layer and IN738LC. This phenomena shows the possibility of the fatigue mechanism similar to that reported in the intermetaric compound TiAl alloy coated with TBC.
一般社団法人日本機械学会の論文
2003-09-19