Growth modes of cracks in creeping type 304 stainless steel

Prediction of creep crack growth behavior in Cr–Mo–V steel specimens with different constraints for a wide range of C∗

“…The experimental results of Tabuchi et al [7] and Tan et al [8,9] have shown that there is an effect of specimen thickness on CCG rates, and the specimens with larger thickness exhibit higher CCG rates. It also has been found that the CCG rates measured in the middle tension (M(T)) specimens are lower than those obtained from deep crack compact tension (C(T)) specimens at the same C ⁄ value for the austenitic stainless steels [10][11][12] and the ferritic steels [13].…”

“…Some experimental and theoretical evidences have shown that the crack-tip constraint can affect creep crack growth (CCG) rates [1][2][3][4][5][6][7][8][9][10][11][12][13]. For a given C ⁄ value, CCG rates in plane strain (PE) are significantly greater than those in plane stress [2][3][4][5][6].…”

Creep constraint analysis and constraint parameter solutions for axial semi-elliptical surface cracks in pressurized pipes

“…The experimental results of Tabuchi et al [12] and Tan et al [13,14] have shown that there is an effect of specimen thickness on the creep crack growth rate, and the specimens with larger thickness exhibit the higher creep crack growth rate. It also has been found that at the same C ⁄ value the creep crack growth rates measured in the middle tension (M(T)) specimens are lower than those obtained from deep crack compact tension (C(T)) specimens for the austenitic stainless steels [15][16][17] and ferritic steels [18]. Yokobori Jr. et al proposed a parameter Q ⁄ for correlating creep crack growth rate [19][20][21][22], and their work shown that the creep crack growth rate for a thick specimen is higher than that of a thin specimen [20].…”

“…Under creep conditions, a lot of experimental and theoretical evidences have shown that constraint can affect creep crack growth rate [6][7][8][9][10][11][12][13][14][15][16][17][18]. However, the deep crack and high constraint C(T) specimen data (R * = 0) measured by using standard test procedure [21] are conventionally used in creep crack growth assessments [41].…”

“…Under creep conditions, a lot of experimental and theoretical evidences have shown that constraint can affect creep crack growth (CCG) rate [6][7][8][9][10][11][12][13][14][15][16][17][18]. For a given C ⁄ value (creep fracture mechanics parameter), the model predications showed that the CCG rates in plane strain (PE) are significantly greater than those in plane stress [7][8][9][10][11].…”