NASA Technical Reports Server (NTRS) 19740012042: Stress-rupture strength and microstructural stability of W-HF-C wire reinforced superalloy composites

by: NASA Technical Reports Server (NTRS)

Publication date: 1974-01-01

Topics: NASA Technical Reports Server (NTRS), CREEP RUPTURE STRENGTH, HEAT RESISTANT ALLOYS, MICROSTRUCTURE, CARBON, FABRICATION, FIBERS, HAFNIUM ALLOYS, MATRIX METHODS, STRUCTURAL STABILITY, TURBINE BLADES, Petrasek, D. W., Signorelli, R. A.,

Collection: NASA_NTRS_Archive; additional_collections

Language: English

W-Hf-C/superalloy composites were found to be potentially useful for turbine blade applications on the basis of stress-rupture strength. The 100-and 1000-hour rupture strengths obtained for 70 volume percent fiber composites tested at 1090 C were 420 and 280 MN/sq m (61,000 and 41,000 psi). The investigation indicated that with better quality fibers, composites having 100- and 1000-hour rupture strengths of 570 and 370 MN/sq m (82,000 and 54,000 psi) may be obtained. Metallographic studies indicated sufficient fiber-matrix compatibility for long time applications at 1090 C for 1000 hours or more.