Temperature subcritical crack growth

Wei, R. P., The Effect of Temperature and Environment on Subcritical Crack Growth, Fracture Prevention and Control, ASM Materials/Metalworking Technology Series No. 3 (1974), 73. 

High-temperature failure of ceramics typically occurs by either subcritical crack growth or creep. In an attempt to summarize the data available so... 

Subcritical crack growth can also occur by the combined effect of stresses and corrosive environment and/or the accumulation of damage at crack tips. The basic premise at ambient and near-ambient temperatures is that SCG results from a stress-enhanced reactivity of the chemical bonds at the crack tip. This phenomenon is thus a strong function of the stress intensity at the crack tip and typically is thermally activated. At high temperatures, the phenomenon of SCG is believed to occur by the formation of cavities ahead of a crack tip. The crack then grows by the coalescence of these cavities. 

F. F. Lange, High-temperature strength behavior of hot-pressed SijNa evidence of subcritical crack growth, J. Am. Ceram. Soc., 57 84-87 (1974). 

Subcritical crack growth is determined by the temperature, the material, and, for the low-temperature processes, the environment. In a given system, the crack-growth rate frequently depends on the stress intensity factor K only. Below a certain, temperature-dependent limiting value Ajo, crack growth... 

Ford, F.P. A mechanism of environmentally-controlled crack-growth of stmctural steels in high-temperature water. In Proceedings of the IAEA specialists meeting on subcritical crack growth, NUREG/CP -0044 2, 249-294 (1981)... 

Kondo, T., Kuniya, J., Takaku, H., Arii, M., Kurihara, M. Recent study on cyclic crack growth of reactor pressure boundary materials in high temperature water environment in Japan. In Proceedings of the Second IAEA Specialists Meeting on Subcritical Crack Growth, NUREG/CP 0067 1, pp. 219-249 (1986)... 

High temperature (>1000°C) properties of the HPSN s is controlled by the second phase [9-11]. In order to improve the high temperature properties (e.g. creep, subcritical crack growth, oxidation) of the HPSN materials, the effects of the weak amorphous second phase must be minimized. Research, done by others in order to improve the second phase effects, involved ... 

Was et al. [110] used the crack depth along the gage section of flat tensile specimens to calculate activation energies for crack growth. Similar studies were published by Teysseyre et al. [113] and by Peng et al. [114] the latter studied the CGR rate of Type 316 stainless steel across the subcritical—supercritical transition to determine the temperature and dissolved oxygen dependence of CGR in SCW (Fig. 4.25). 

Figure 4.25 Crack growth rate versus temperature across the subcritical—supercritical line for a 0.5r CT specimen of unsensitized Type 316L stainless steel in pure water. The water density and rate of weight gain over approximately 500 h are also shown [114].

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