The Effect of Tailored Deformation on Fatigue Strength of Austenitic 316L Stainless Steel

Abstract

Fatigue failure is one of major problems of the structural components under cyclic loading; however the fatigue test is a time-consuming and high-cost process. Therefore, it is better to establish the relationship between the fatigue property and static mechanical properties of materials. The present studies mainly focus on the relationship between fatigue strength and tensile strength of 316L austenitic stainless steel prepared with four different technologies. The rolling results in severe plastic deformation; dislocation multiplication occurs inside the grains, and the elongated grains are parallel to the rolling direction. With the tensile strength increasing, the optimum fatigue strength reaches at an appropriate tensile strength. The fatigue strength is controlled by the tensile strength and the ability of work hardening, and based on this analysis a new method is established to estimate the fatigue strength. The competitive mechanism between fatigue crack initiation and propagation is also proposed to account for the different shapes of S-N curves.

Influence of Loading Sequence Effect on Cyclic Hysteresis Characteristics of an Al–Mg–Si Alloy

“…The constant amplitude load (CAL), as shown in Table 3, is designed based on the linear equivalent damage theory. [23,24] The designed CAL must contribute the same fatigue damage as the acquired VAL. Then, the test load spectrums of highlow and low-high sequence forms are designed based on CAL under the condition of zero mean stress.…”

Effect of Build Direction on Fatigue Performance of L-PBF 316L Stainless Steel

“…10, fatigue cracks of L-PBF 316L SS generally initiate at the surface or the defects and fatigue damage is primarily caused by localized deformation. Increasing the work-hardening ability could effectively promote the accumulation of localized plastic deformation endurance [35], and Zhang et al [36] defined hardened strength (Δσ T ) as the difference between maximum stress and limit of elasticity to reflect the resistance to localized plastic deformation. As shown in Fig.…”

Casting and spinning aluminum alloy wheel fatigue properties and life prediction study

“…Many of the above studies have shown that the initial casting microstructure will have a significant impact on the subsequent fatigue behaviors. In addition, the relationship between plastic deformation (or complex loadings) and fatigue performance has been widely reported 19–22 . It is generally believed that the larger the degree of plastic deformation, the higher the tensile strength and fatigue strength will be.…”

“…In addition, the relationship between plastic deformation (or complex loadings) and fatigue performance has been widely reported. [19][20][21][22] It is generally believed that the larger the degree of plastic deformation, the higher the tensile strength and fatigue strength will be. This is due to the high dislocation density increases the resistance to crack initiation.…”