Fatigue crack growth behavior of laser-processed 304 stainless steel in air and gaseous hydrogen

A quantitative analysis of the effect of laser transformation hardening on crack driving force in steels

“…On the other hand, the decrease of the crack driving force means the increase of resistance to crack growth, and this situation can improve the fracture behavior. Besides the results presented in this work, the high residual compressive stress and high strength resulting from LTH treatment also play an important role in improving fatigue behavior [1][2][3][4][5][6][7][8], such as the decrease of the fatigue crack growth rate or the increase of resistance to crack growth [2,5,8]. Thus, the residual compressive stress and high strength from LTH treatment have a significant effect on fracture behavior in fatigue or non-fatigue cases.…”

“…Authors' report [1][2][3][4][5][6][7] stated it could improve the fatigue properties of steels, such as the increase of the fatigue limit, fatigue strength, or the decrease of the fatigue crack growth rate. Authors' report [8] stated the laser-processed specimens could exhibit a higher resistance to crack growth in the low stress intensity factor range. It was also reported that the laser heat treatment could improve the wear properties [9][10][11][12] and the erosion properties [13,14].…”

Effect of Hydrogen Concentration on Fretting Fatigue Strength

“…But the reduction tends to have a lower limit. The acceleration of crack propagation [3]- [5] and the reduction of K th [6][7] due to absorbed hydrogen have been reported. These are considered to be possible causes of the reduction of fretting fatigue strength.…”

Effects of hydrogen water chemistry on corrosion fatigue behavior of cold-worked 304L stainless steel in simulated BWR coolant environments

“…There was no distinction of quasi-cleavage features noted between the specimens tested in the air-saturated and HWC water environment, which is consistent with the observations of nearly identical CFCGRs for the cold-worked specimens tested in both different environments. The formation of flat facets had been related to the crack growth along the twin boundaries or austenite grain boundaries [7,[29][30][31]. Besides quasi-cleavages, plenty of corrosion debris was observed on the fracture surfaces of the specimens which were tested in the air-saturated water environment.…”