The crack propagation resistance, determined by Irwin's criterion K1C, increases with the nickel and manganese concentrations in precipitation-hardening austenitic steels.
When austenitic steel is alloyed with chromium the variation of K1C with the concentration of the alloying element is characterized by a peak at 3.5% Cr.
The use of data concerning the effect of alloying on the crack propagation resistance makes it posble to optimize the strength characteristics of precipitation-hardening austenitic steels more precisely.
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Kovneristyi, Y.K., Blinov, V.M. The resistance to crack propagation of precipitation-hardening austenitic steel. Met Sci Heat Treat 13, 54–55 (1971). https://doi.org/10.1007/BF00663780
- Propagation Resistance
- Alloy Element