Abstract
Environmental cracking- and fatigue-related failures threaten all major industries and, to combat such degradation, numerous residual stress impingement (RSI) methods have been developed with varying levels of efficacy and ease of use. Some of the most commonly used RSI methods, such as shot peening, laser shock peening, and low plasticity burnishing, as well as new methods, such as ultrasonic nanocrystal surface modification, are reviewed in the context of corrosion, corrosion fatigue, and environmental cracking mitigation. The successes and limitations of these treatments are discussed, with a focus on their efficacy against these three damage modes based on the available literature. Case studies are reviewed that demonstrate how these treatments have been adopted and advanced by industry, and application-specific research efforts are explored with a focus on future opportunities. Research is identified that illustrates how the utility of these surface treatments may vary between alloy systems, and where the benefits must be weighed against the risks to a component’s service performance.
Highlights
Metallic components undergo stress due to externally applied forces and/or internal residual forces, with the latter often originating from thermally induced deformation during production or from the forming and machining processes
These results suggested that, despite the similar magnitude of compressive residual stress imparted by both processes, there exists a critical depth below which compressive residual stress has a measurable impact on the effective ∆K at the crack front
This study demonstrated that laser shock peening (LSP) was more effective at both mitigating crack initiation and extending fatigue life than shot peening (SP) in simulated hook-shank geometries made of Hy-Tuf
Summary
Metallic components undergo stress due to externally applied forces and/or internal residual forces, with the latter often originating from thermally induced deformation during production or from the forming and machining processes. These stresses may act in concert with the surrounding environment, component geometry, surface defects, corrosion, and more to induce subcritical damage in the form of fatigue, corrosion fatigue, or environmentally assisted cracking (EAC) These phenomena affect the majority of alloys under the right conditions, and all require a minimum stress intensity (K)/stress intensity amplitude (∆K) condition to initiate and propagate [1]. Priyadarsini reviewed the most common burnishing-related RSI methods (ball, roller, and LPB), and compared them against one another in residual stress penetration and stability, as well as the ability to improve fatigue, corrosion fatigue, fretting, and environmental cracking [9]. Case studies will be explored that detail the unique application and advancement of RSI in various industrial sectors for the purpose of mitigating corrosion, corrosion fatigue, and EAC
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