Machine learning-based predictions of fatigue life and fatigue limit for steels

Shot peening using particles 10 μm in diameter (ultra-fine particle peening: Ultra-FPP) was introduced to improve the fatigue properties of 5056 aluminum alloy. The surface microstructures of the Ultra-FPP treated specimens were characterized using a micro-Vickers hardness tester, scanning electron microscopy (SEM), X-ray diffraction (XRD), non-contact scanning white light interferometry, and electron backscatter diffraction (EBSD). The Ultra-FPP treated specimen had higher hardness than the conventional FPP treated specimen with a short nozzle distance due to the high velocity of the ultra-fine particles. Furthermore, the surface hardness of the Ultra-FPP treated specimen tended to increase as the peening time decreased. Fatigue tests were performed in air at room temperature using a cantilever-type rotating bending fatigue testing machine. It was found that the fatigue life of the Ultra-FPP treated specimen tended to increase with decreasing peening time. Mainly, the Ultra-FPP improved the fatigue properties of 5056 aluminum alloy in the very high cycle regime of more than 107 cycles compared with the un-peened specimens. This is because the release of the compressive residual stress is small during fatigue tests at low stress amplitudes.

/pdf/effect-of-shot-peening-using-ultra-fine-particles-on-fatigue-2fwjhjwpds.pdf

Effect of shot peening using ultra-fine particles on fatigue properties of 5056 aluminum alloy under rotating bending

The current understanding of room temperature microplasticity in α/β titanium alloys is reviewed with a special emphasis on dual-phase engineering alloys. As the interplay between microstructure and deformation mechanisms governs both the microscale and macroscale mechanical response, a brief description of the main features of α/β microstructures is first provided. Elastic and plastic deformation in individual phases is then described. The complex interactions that govern the effect of grain boundaries, phase interfaces and microtexture on deformation behaviour are reviewed. Crystal plasticity simulations have evolved over the past decade as a key technique to obtain a mechanistic understanding of the deformation of Ti alloys. Micromechanical aspects are emphasized with a discussion of input parameters required to achieve realistic constitutive modeling. As microplasticity is especially relevant in cyclic loading such as experienced in-service by components, the current understanding of the relation of this regime with fatigue and dwell-fatigue behavior is briefly summarized in the final section.

/pdf/microplasticity-at-room-temperature-in-a-b-titanium-alloys-2yhorasv7l.pdf

Microplasticity at Room Temperature in α / β Titanium Alloys

Micro-mechanisms of microstructural damage due to low cycle fatigue in CoCuFeMnNi high entropy alloy

Multi-dimensional study of the effect of early slip activity on fatigue crack initiation in a near-α titanium alloy

The effects of crystallographic orientation on fatigue crack initiation behavior in Ti-6Al-4V

Fatigue limit estimation for carburized steels with surface compressive residual stress considering residual stress relaxation

Combined effect of surface morphology and residual stress induced by fine particle and shot peening on the fatigue limit for carburized steels

In order to investigate the effect of an ultrasonic shot peening (USP) treatment on the fatigue characteristics of structural materials for hydroelectric facilities, plane bending fatigue tests were carried out using USP treated ASTM CA6NM stainless cast steel. The results showed that the fatigue limit of the USP material was approximately 60% higher than that of the untreated material. Haigh’s diagram evaluation suggested that an increase in crack initiation resistance associated with the high hardness and compressive residual stress by USP treatment was the main reason for the improvement in fatigue strength. Furthermore, the simulation of fatigue crack propagation implied that compressive residual stress leads to a low crack propagation rate compared with the untreated material. Consequently, it is clear that the USP treatment is an effective process for improving the fatigue properties of CA6NM.

Fatigue strength of USP treated ASTM CA6NM for hydraulic turbine runner

Evaluating the fatigue limit of metals having surface compressive residual stress and exhibiting shakedown

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