腐食環境下における溶射部材の疲労特性
1994 年 43 巻 11 号 p. 648-653
詳細
1994 年 43 巻 11 号 p. 648-653
In order to evaluate the corrosion fatigue characteristics of the structure materials, the fatigue tests should be carried out in environments which closely approximate the actual corrosive environments. In the present work, the fatigue characteristics of the carbon steel (S45C), coated with thermal sprayed zinc and aluminum layers, were investigated during the accelerated corrosion test in which the specimens were subjected to repeated cycles of salt water spraying, drying in a warm air, and exposure in open air at a room temperature.
The results are as follows;
1) The surfaces of the turned and blasted specimens are slightly harder due to the hardening effect.
2) In the thermal sprayed and painted specimens, the fatigue limit under the rotate-bending mode is the same as that of the blasted specimen tested in air.
3) The microstructure near the fatigue limit is the mixture of ferrite and pearlite.
4) Dimples and quasi-striation patterns are obseved in the fatigue surfaces. While, tire-track patterns are observed in the fracture surfaces of the turned specimens.
