Abstract
In this paper, we propose a methodology for enhancing the fatigue life of SS316 by performing intermittent recovery heat-treatment (RHT) in the Argon environment at different temperatures. To this end, fully-reversed fatigue bending tests are conducted on the heat-treated SS316 specimens. Damping values are obtained using the impact excitation technique to assess the damage remaining in the material after each RHT and the corresponding fatigue life. Damping is also used to distinguish the three stages of the fatigue phenomenon and the onset of crack initiation. The results show that by performing intermittent RHTs, the density of dislocation is decreased substantially and fatigue life is improved. Examination of the damping results also reveals that the material becomes more brittle after the RHT due to the decrease in the density of dislocations. The fatigue life of the specimens is governed by these two phenomena.
Highlights
Fatigue is the most common type of failure of mechanical components under cyclic loading, often with catastrophic consequences
Fully-reversed fatigue bending tests are performed on flat dog-boned SS316 specimens to study the effect of recovery heat treatment on the fatigue life of the specimens
The results reveal that two different mechanisms affect the fatigue life of specimens after recovery heat-treatment (RHT)
Summary
Fatigue is the most common type of failure of mechanical components under cyclic loading, often with catastrophic consequences. This has inspired scientists to investigate different techniques to both predict and extend the fatigue life of materials. As the number of cycles increases, the density of dislocations saturates due to the balance between their multiplication and annihilation, the dislocations bundle turns into the well-known structure called the persistent slip bands (PSBs), and the plastic strain energy stabilizes. It is generally believed that most of the plastic strain energy dissipates in PSBs and manifests itself as extrusions and intrusions on the free surface of the material [3].
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