The carrying capacity in terms of permissible stress (σ0, 2) of steels Kh18N10T and Kh21N5AG7 under conditions of uniaxial static tension increases 50% down to −253° as the result of surface hardening.
For hardened steels Kh18N10T and Kh21N5AG7 σ b n /σn > 1 and σ b n /σ0.2 > 1 with Kt=3.0 in the range of 20 to −253° C.
With static loading and bulk stress conditions (notch root radius 0.25 mm) steel Kh18N10T can be used down to −253° C and steel Kh21N5AG7 down to −196° C in the hardened condition.
Under dynamic bending conditions steels Kh18N10T and Kh21N5AG7 can be used in the hardened condition down to −253° C in the presence of a stress concentrator (Kt=3.4).
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D. V. Lebedev and B. M. Ovsyannikov, Metal, i Term. Obrabotka Metal., No. 9 (1971).
D. V. Lebedev, Metal. i Term. Obrabotka Metal., No. 3 (1971).
H. Neuber. Stress Concentrations [Russian translation], ONTI (1947).
Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 24–30, October, 1971.
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Lebedev, D.V., Ovsyannikov, B.M. Hardening the surface of austenitic steels by strain hardening. Met Sci Heat Treat 13, 827–832 (1971). https://doi.org/10.1007/BF00713816
- Stress Condition
- Static Loading
- Strain Hardening
- Austenitic Steel
- Stress Concentrator