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Peening

About: Peening is a research topic. Over the lifetime, 5538 publications have been published within this topic receiving 73073 citations.


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Journal ArticleDOI
TL;DR: In this paper, the effect of ultrasonic shot peening on the oxidation behavior of two F/M steels with the same Cr content of around 12.5% and varied Si content from 0.6% to 2.2% was investigated.

28 citations

Journal ArticleDOI
TL;DR: In this article, the effects of shot peening on the fatigue strength and the fracture mechanism in wide range of fatigue life of an 18% Ni maraging steel by using shot particles of various sizes or hardness were investigated.
Abstract: Rotating bending fatigue tests up to 108 cycles were carried out to investigate the effects of shot peening on the fatigue strength and the fracture mechanism in wide range of fatigue life of an 18% Ni maraging steel by using shot particles of various sizes or hardness. Fatigue strength was increased markedly by shot peening in the wide region of fatigue life. The S-N curves showed duplex S-N properties because of the transition of fracture origin from the specimen surface in the short life region to the subsurface in the long life one. Double shot peening by using superhard fine particles was effective to improve the fatigue strength for surface fracture, though the fatigue strength for an internal fracture was only slightly influenced. Fatigue strength for the internal fracture was increased by formation of reversion austenite, suppressing intergranular cracking.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the deformation and compressive residual stress, induced by the laser shock peening (LSP), present gradient distributions along the depth direction, and high-angle grain boundaries (HAGB, >15°) are increased by deformation twins, which are introduced into primary α phases during the plastic deformation.

28 citations

01 Jan 2004
TL;DR: In this paper, a high-spatial-resolution characterization of shock treated copper thin films on single-crystal silicon substrates is reported, where scanning x-ray microtopography is used to map the relative variation of the stress/strain field with micron spatial resolution, and instrumented nanoindentation is applied to measure the distribution of hardness and deduce the sign of the strain energy density at the film-substrate interface.
Abstract: Microscale Laser Shock Peening (LSP) is a technique that can be potentially applied to manipulate the residual stress distributions in metal film structures and thus improve the reliability of micro-devices. This paper reports high-spatial-resolution characterization of shock treated copper thin films on single-crystal silicon substrates, where scanning x-ray microtopography is used to map the relative variation of the stress/strain field with micron spatial resolution, and instrumented nanoindentation is applied to measure the distribution of hardness and deduce the sign of the stress/strain field. The measurement results are also compared with 3-D simulation results. The general trends in simulations agree with those from experimental measurements. Simulations and experiments show that there is a near linear correlation between strain energy density at the film-substrate interface and the X-ray diffraction intensity contrast.

28 citations

Journal ArticleDOI
TL;DR: In this article, the effectiveness of shot peening in suppressing LCF crack initiation and growth at surface non-metallic inclusions was studied. But the results showed that the most severe effects of inclusions were at cracks initiating from inclusions intersecting the specimen surface.
Abstract: The fatigue lives of modern powder metallurgy disk alloys can be reduced over an order of magnitude by cracking at inherent non-metallic inclusions. The objective of this work was to study the effectiveness of shot peening in suppressing LCF crack initiation and growth at surface non-metallic inclusions. Inclusions were carefully introduced at elevated levels during powder metallurgy processing of the nickel-base disk superalloy Udimet ® 720. Multiple strain-controlled fatigue tests were then performed on machined specimens with and without shot peened test sections at 427 and 650 °C. The low cycle fatigue lives and failure initiation sites varied as functions of inclusion content, shot peening, and fatigue conditions. A large majority of the failures in as-machined specimens with the introduced inclusions occurred at cracks initiating from inclusions intersecting the specimen surface. These inclusions reduced fatigue life by up to 100×, when compared to lives of material without inclusions residing at specimen surface. Large inclusions produced the greatest reductions in life for tests at low strain ranges and high strain ratios. Shot peening improved life in many cases by reducing the most severe effects of inclusions.

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023256
2022500
2021282
2020303
2019340
2018305