论文信息 - DEVELOPMENT OF A DAMAGE TOLERANT MICROSTRUCTURE FOR INCONEL 718 TURBINE DISC MATERIAL

DEVELOPMENT OF A DAMAGE TOLERANT MICROSTRUCTURE FOR INCONEL 718 TURBINE DISC MATERIAL

A new modified heat treatment has been developed for Inconel 718. This heat treatment leads to substantial improvements in elevated temperature crack propagation resistance with apparently limited loss in resistance to LCF crack initiation as compared to the conventional heat treatment for this alloy. This is a result of tailoring the microstructure to obtain the optimum combination of grain size, grain boundary structure and matrix precipitate morphology.

[1] T. S. Cook,et al. Stress-Strain Behavior of Inconel 718 During Low Cycle Fatigue , 1982 .

[2] W. Mills. The Effect of Heat Treatment on the Room Temperature and Elevated Temperature Fracture Toughness Response of Alloy 718 , 1980 .

[3] H. Aaronson,et al. Influence of solution annealing temperature upon precipitate nucleation kinetics at grain boundaries , 1976 .

[4] H. Merrick. Effect of heat treatment on the structure and properties of extruded P/M alloy 718 , 1976 .

[5] M. Donachie,et al. The effects of solution and intermediate heat treatments on the notch-rupture behavior of Inconel 718 , 1975 .

[6] D. Wilson. Relationship of Mechanical Characteristics and Microstructural Features to the Time-Dependent Edge-Notch Sensitivity of Inconel 718 Sheet , 1973 .