THE STATIC AND DYNAMIC STRENGTH OF A CARBON STEEL AT LOW TEMPERATURES
Previous investigations of the effect of temperature on the static and dynannic strength of steel are briefly reviewed. A description is given of tests in which small specimens of a medium-carbon steel were compressed at high rates of strain and at temperatures ranging from 15 to --121 deg C. Dynamic stress- strain curves obtained from these tests are compared with stress-strain curves obtained from tests at normal rates of strain, at temperatures from 15 to --183 deg C. The results indicate that the effect on the stress-strain curve of increasing the average strain rate to 500 sec/sup -1/ is comparable to that of lowering the test temperature to --183 deg C, the upper yield stress being multiplied some 2 1/2 times and the lower yield strain being increased considerably. The effect of testing at high rates and low temperatures is to raise the curve still further. Metallographic examination shows that the slip occurring in the ferrite at low temperatures and normal rates is finer than that obtained at room temperature; also there is less multiple slip. These characteristics were also observed at high strain rates. No twinning took place in the static tests, even at the lowest temperature. In the dynamic tests, twins were not formed at room temperature, but were formed at the lower test temperatures. (auth)
- Research Organization:
- Univ. of Oxford
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-016417
- OSTI ID:
- 4298188
- Journal Information:
- Phil. Mag., Journal Name: Phil. Mag. Vol. Vol: (8) 3
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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