Effect on Strain Ageing on the Non-propagation of Fatigue Crack of Low-Carbon Steel.

Intergranular Fatigue Crack Initiation and Its Associated Small Fatigue Crack Propagation in Water-quenched Fe–C Fully Ferritic Steel

“…After 10 7 cycles at 210 MPa, the stress amplitude was increased by 5 MPa every 10 7 cycles to investigate whether the coaxing effect [15][16][17] occurs as shown in Fig. 2.…”

“…[15][16][17] More specifically, chemical composition affecting microstructure and strength plays a key role on the microstructurally-small fatigue crack propagation behavior. In particular, carbon is the most important element in fatigue of steels.…”

Intrinsic Factors that Trigger the Coaxing Effect in Binary Fe–C Ferritic Alloys with a Focus on Strain Aging

“…However, the underlying mechanism of the coaxing effect has not been elucidated yet. It has been reported that the coaxing effect appears when work hardening 11) or strain-age hardening of carbon 12,13) are significant during fatigue. The latter factor likely plays an important role in the appearance of the coaxing effect in ferritic steels.…”

Characteristic Fatigue Crack Growth Behavior of Low Carbon Steel under Low-pressure Hydrogen Gas Atmosphere in an Ultra-low Frequency

“…The kinetics of solute atom diffusion causes the negative frequency dependence of the dislocation mobility. [17][18][19] Since dynamic strain aging is one of the important factors that control fatigue crack propagation behavior, 20,21) when it occurs, the fatigue crack growth rate exhibits a negative frequency dependence in response to the change in dislocation mobility.…”

“…21,32) In Nishikawa's model, 23,24) hydrogen segregation in front of a crack tip causes plastic strain localization, resulting in microvoid formation and its coalescence with the crack. This phenomenon accelerates the fatigue crack propagation.…”