Co基自溶合金溶射部材の組織と疲労特性

概要

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Rotational-bending fatigue tests were performed on Co-based alloy thermally sprayed specimen with special focus on the effect of mixed NiCr weight ratio on coating microstructure and on fatigue properties. Effects of post heat treatment (fusing treatment) on coating microstructure and on fatigue strength after 10^7 cycles were also discussed. The results obtained are as follows: (1) There is considerable scatter in observed fatigue life for specimens sprayed with Co-based self-fluxing alloy. This is because each specimen has its own fatigue strength associated with different porosities and microstructures of coatings. (2) Fusing treatment temperature strongly affects the characteristics of sprayed coating in terms of microstructure and porosity. The fatigue strength of a sprayed specimen without fusing treatment was much lower than that of a steel substrate. An improvement of fatigue strength has been obtained by well controlled fusing treatment.
一般社団法人日本機械学会の論文
1996-12-25