Relationship of the kinetic diagram of creep crack growth to the failure mechanism of heat-resistant steels. Report 1

Autor: Vainshtok, V. A., Baumshtein, M. V., Makovetskaya, I. A., Kramarenko, I. V., Shtukaturova, A. S.
Zdroj: Strength of Materials; May 1989, Vol. 21 Issue: 5 p575-581, 7p
Abstrakt: Conclusions 1.A significant creep crack growth rate (-10-4-10-5 mm/h) is observed to take place in energy equipment components at values of KI\t~0.1KIc at a temperature of 838 K.Propagation of the creep crack in the hot zones of steam turbine components may make a significant contribution to the subcritical growth of the crack. With increase in the temperature and the load, the rate of creep crack growth sharply increases.2.It was established that the diagram of creep crack growth of heat resistant steels over intervals of temperature and loading which correspond to those found in service has three sections.Transfer from the first section to the second is associated with a change in the failure mechanism, and from the second to the third with a change from failure controlled by the value of KI to that of failure controlled by the value of the modified J*.
Databáze: Supplemental Index
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