超合金(NCF-600)の疲労強度に関する研究

概要

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In this paper, the strain controlled fatigue test at room temperature in air and the fractographic study on superalloy Inconel 600 are performed. From the test results, the relations between nominal stresses and number of cycles are obtained to show that the stress increases slightly in the early period, then remains stable at constant value for a subsequent long period, and then steeply drops immediatly before the final failure. The relationships on strain amplitude with fatigue life are introduced. The values of fictitious stress amplitude calculated from the test results are just lying between the two best fit curves from ASME, Sec. III, Division I, Appendix Table l. 9. l/2 in 1983 and Transaction of ASME, Nov. 1977,p. 584. From the microscopic examination of the fatigue fracture, there are three failure process zones : fatiguecrack origin appearance zone, stable radial spread zone, and final fast fracture zone.
東海大学の論文