プラズマ溶射アルミナ被覆ステンレス鋼の疲労き裂進展挙動

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To clarify the effect of plasma spraying on cyclic fatigue crack growth behavior, the single edge notched (SEN) specimen of SUS 316 stainless steel with plasma-sprayed alumina deposit on one side has been fatigued. Fatigue tests were conducted in push-pull loading with a servo electro hydraulic fatigue testing machine at a stress ratio of R=-1 and a frequency of 30 Hz. Microscopic examination of the front rim contour of growing cracks demonstrated that at the stress amplitude of 46 MPa fatigue cracks fairly delayed on the alumina plasma-sprayed surface side as compared with those on the non-sprayed one. However, the plasma spraying had no effect on crack growth behavior at 130 MPa. It was concluded that the retardation of crack growth on the sprayed surface side was closely connected with the grit blasting which was carried out prior to plasma spraying and depended on cyclic stress amplitudes. Fatigue cracks in the alumina deposit were observed to develop linking those microcracks which were formed in grains and on grain boundaries near the tip of a main crack under cyclic loading. Fracture surface of the alumina deposit was characterized by the mixed brittle mode of transgranular and inter-granular fracture. In addition, microstructure of the alumina deposit was examined by X-ray and transmission electron microscope techniques. It was found that the plasma-sprayed alumina deposit was composed of the η-phase which often contained small α-phase grains and a number of pores were included in some grains. These pores have been mostly observed with microcracks which were formed around a main crack.
社団法人日本セラミックス協会の論文
1992-11-01

プラズマ溶射アルミナ被覆ステンレス鋼の疲労き裂進展挙動

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