REGULARITIES IN CREEP AND HOT FATIGUE DATA. PART II
The theory of regularities ia creep and hot-fatigue data are compared with 103 sets of published creeprupture, creep rate, and hot fatigue data relating mainly a alloys of the iron, nickel, chromium, and cobalt system of 44 different compositions. The results of all analyses are tabulated, and a statistical assessment of the extent of agreement of the theory with the data are given with reference to the number of free constants used. (J.E.D.) l6l95 The niobium-carbon system has been determined by x-ray and metallographic examination of sintered and arc-cast alloys. Two carbides exist: hexagonal Nb/sub 2/C with a limited range of homogeneity, and cubic NbC with a solubility range from 8.25 a 10.25 weight per cent carbon. Dilute alloys freeze by eutectic reaction at the eutectic temperature, but this decreases rapidly with temperature. Metallographic evidence indicates a peritectic reaction between melt, Nb/sub2/C, and NbC; alloys richer in carbon than NbC freeze by eutectic reaction. (auth)
- Research Organization:
- Gt. Brit. Aeronautical Research Council
- NSA Number:
- NSA-13-016194
- OSTI ID:
- 4245349
- Report Number(s):
- ARC-CP-380
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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