Author: Marvin H. Hirschberg Publisher: ISBN: Category : Space shuttles Languages : en Pages : 36
Book Description
The resistance of thin TD-NiCr sheet to cyclic deformation was compared with that of TD-Ni and a conventional nickel-chromium alloy. Strains were determined by a calibration technique which combines room-temperature strain gage and deflection measurements with high-temperature deflection measurements. Analyses of the cyclic tests using measured tensile and creep-rupture data indicated that the TD-NiCr and NiCr alloy specimens failed by a cyclic creep mechanism. The TD-Ni specimens, on the other hand, failed by a fatigue mechanism.
Author: John Daniel Whittenberger Publisher: ISBN: Category : Nickel alloys Languages : en Pages : 36
Book Description
Dispersoid-free regions were observed in TD-NiCr (Ni-20Cr-2ThO2) after slow strain rate testing in air from 1145 to 1590 K. Formation of the dispersoid-free regions appears to be the result of diffusional creep. The net effect of this creep is the degradation of TD-NiCr to a duplex microstructure. Degradation is further enhanced by the formation of voids and integranular oxidation in the thoria-free regions. These regions apparently provided sites for void formation and oxide growth since the strength and oxidation resistance of Ni-20Cr is much less than Ni-20Cr-2ThO2. This localized oxidation does not appear to reduce the static load bearing capacity of TD-NiCr since long stress rupture lives were observed even with heavily oxidized microstructures. But this oxidation does significantly reduce the ductility and impact resistance of the material. Dispersoid-free bands and voids were also observed for two other dispersion strengthened alloys, TD-NiCrAl and IN-853. Thus, it appears that diffusional creep is charactertistic of dispersion-strengthened alloys and can play a major role in the creep degradation of these materials.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 970
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Publisher: ISBN: Category : Friction Languages : en Pages : 1024
Book Description
These volumes cover the properties, processing, and applications of metals and nonmetallic engineering materials. They are designed to provide the authoritative information and data necessary for the appropriate selection of materials to meet critical design and performance criteria.
Author: Howard Kuhn Publisher: ASM International(OH) ISBN: Category : Technology & Engineering Languages : en Pages : 1024
Book Description
This book is ASM's standard reference on the mechanical characteristics and testing of metals, plastics, ceramics, and composites. Understand the basics of mechanical behavior with in-depth coverage on testing methods for those materials. Comparative mechanical properties and the mechanical characteristics of metals, plastics, and ceramics are included throughout for general reference. Updated references to ISO, ASTM, DIN, EN, JIS and other standards are also included.
Author: Marvin H. Hirschberg
Author: 
Author: United States. Superintendent of Documents
Author: 
Author: John Daniel Whittenberger
Author: 
Author: 
Author: 
Author: Howard Kuhn
Author: