Comments on lozinsky and simeonova's paper on “superhigh plasticity of commercial iron under cyclic fluctuations of temperature”
✍ Scribed by O.D. Sherby; A. Goldberg
- Publisher
- Elsevier Science
- Year
- 1961
- Weight
- 360 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0001-6160
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✦ Synopsis
Comments
on Lozinsky and Simeonova's paper on "Superhigh plasticity of commercial iron under cyclic fluctuations of temperature"* Thus, if the value of 8 exp (Q/RT) is known for a given stress, the strain can be evaluated for any variable temperature history by determining 8 from a graphical integration of an exp -(Q/RT) vs. time plot.
Lozinsky and Simeonova, in studying the effect of cyclic temperature on the creep behavior of Armco iron, under constant load, noted the frequent appearance of two necks more or less equally displaced from the center of the specimen.(l) In addition to temperature cycling, the authors maintained a temperature gradient along the specimen where the maximum temperature at the center of the specimen was usually in the gamma region with the temperature falling off rapidly from the center. The gradient was responsible for the conditions leading to the formation of the two necks. This phenomenon of excessive straining in a region where the temperature was considerably below that of the maximum temperature was referred to as "superhigh plasticity".