By H. E. Boyer, Howard E. Boyer
This atlas is split into 22 sections plus an appendix. Sections 1, 2, and three include technical discussions of varied points of the imperative subject. For these no longer conversant in the concept that of creep, its size, and the translation of try effects, this introductory fabric can be very worthy. The appendix, put on the finish of the publication, is a word list of phrases appropriate to creep. the remainder sections are: Iron-Base Superalloys; Nickel-Base Superalloys; Cobalt-Base Superalloys; Superalloy Comparisons; Refractory Metals; Refractory Metals Comparisons; ACI Casting Alloys; Austenitic Stainless Steels; Ferri tic Stainless Steels; Martensitic Stainless Steels; Precipitation Hardening Stainless Steels; Higher-Nickel Austenitic Alloys; Stainless Steels Comparisons; Nickel-Base Alloys; forged Irons; Carbon and Alloy Steels; Copper and Copper Alloys; Magnesium and Magnesium Alloys; Titanium and Titanium Alloys.
the way to Use This ebook
desk of Contents
1. normal advent to Creep
2. try out equipment and gear
three. Manipulation and Interpretation of knowledge
four. Iron-Base Superalloys
five. Nickel-Base Superalloys
6. Cobalt-Base Superalloys
7. Superalloy Comparisons
eight. Refractory Metals
nine. Refractory Metals Comparisons
10. ACl Casting Alloys
eleven. Austenitic Stainless Steels
12. Ferritic Stainless Steels
thirteen. Martensitic Stainless Steels
14. Precipitation Hardening Stainless Steels
15. Higher-Nickel Austenitic Alloys
sixteen. Stainless Steels Comparisons
17. Nickel-Base Alloys
18. solid Irons
19. Carbon and Alloy Steels
20. Copper and Copper Alloys
21. Magnesium and Magnesium Alloys
22. Titanium and Titanium Alloys
Appendix: word list
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Additional info for Atlas of Creep and Stress-Rupture Curves
The sigmoidal shape of isotherms is thus more evident, but extrapolation difficulties remain. The double inflections (or sigmoidal shape) for rupture curves can be greatly accentuated when notched specimens are tested. In the intermediate stress regime, rupture life can actually decrease as the level of test stress is lowered. Time-Temperature Parameters Use of time-temperature parameters (TTP’s) for presenting and extrapolating high-temperature creep-rupture data has been practiced for many years.
These techniques include graphical methods, time-temperature parameters, and methods used for estimations when data are sparse or hard to obtain. Graphical Methods Test results frequently are displayed as plots of log stress versus log rupture time and log stress versus log secondary creep rate, with a separate curve (isotherm) for each test temperature. For limited ranges of test variables, test points frequently fall in a straight line for each temperature. Nonlinearity of isotherms with broader ranges of test parameters has been treated variously, but common practice is to represent the data by two or more intersecting straight line segments.
The microswitch that shuts off the timer often also shuts off or lowers the temperature of the furnace. In some furnaces, the life of the heating element is reduced significantly if the furnace is shut off after each test; instead, the temperature is merely lowered. NOTCHED-SPECIMEN TESTING Notched specimens are used principally as a qualitative alloy selection tool for comparing the suitability of materials for components that may contain deliberate or accidental stress concentrations. The rupture life of notched specimens is an indication of the ability of a material to deform locally without cracking under multiaxial stresses.
Atlas of Creep and Stress-Rupture Curves by H. E. Boyer, Howard E. Boyer