On the influence of mechanical surface treatments—deep rolling and laser shock peening—on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures

Nalla, Ravi K.; Altenberger, I.; Noster, Ulf; Liu, Gao; Scholtes, Berthold; Ritchie, Robert O.

doi:10.1016/s0921-5093(03)00069-8

Cited by 454 publications

(251 citation statements)

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“…Pareto charts were used to represent the response of the parametric interaction on the DR process. The output of these charts could be affected by the chosen confidence interval (α), which is used to indicate the reliability of an estimate of the effects [13,36]. In the present work, a 5% of confidence interval (α) was used, which implies that 95% (1−α) of the confidence intervals would contain the true response.…”

Section: Surface Roughness and Microhardnessmentioning

confidence: 99%

“…Thus, previous studies [9][10][11][12][13] have introduced several mechanical surface treatments as potential solutions to improve the fatigue life of specimens. Among these treatments are laser shock peening (LSP), shot peening (SP), low plasticity burnishing (LPB), and deep-rolling (DR).…”

Section: Introductionmentioning

confidence: 99%

“…Deep-rolling is a mechanical surface treatment using rolls or ball-point tools inducing deep compressive residual stresses and plastic deformations on the sample surface [13,[22][23][24]. In contrast, in low-plasticity burnishing process load is usually applied with lower forces or pressures and mostly aims to obtain a certain surface quality with minimized surface roughness and plastic deformation [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…Deep-rolling process involves controlled pressure through a smooth hydrostatically-seated hard ball or cylinder against the surface of a specimen, under a normal force sufficient to plastically deform its surface [13]. The burnishing tool is normally held in a lathe tool holder in place of the cutting tool, or can be held by any CNC machine or an industrial robot, depending on the application.…”

Section: Introductionmentioning

confidence: 99%

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Water Impingement Erosion of Deep-Rolled Ti64

Mostafa

Kevorkov

et al. 2015

Metals

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Abstract:In this work, the Liquid Impingement Erosion (LIE) performances of deep-rolling (DR) treated and non-treated Ti64 were investigated. Various erosion stages, from the incubation to the terminal erosion stages, could be observed. A full factorial design of experiments was used to study the effect of DR process parameters (Feed Rate, Spindle Velocity, Number of Passes, Pressure) on the residual stress distribution, microhardness and surface roughness of the treated Ti64 specimens. The DR-treated Ti64 specimens exhibited improved surface microhardness, surface roughness, and large magnitude of compressive residual stresses, which were attributed to the amount of cold work induced by the DR process. Although DR improved the mechanical properties of the Ti64, the results showed that the treatment has little or no effect on the LIE performance of Ti64 but different damage modes were observed in these two cases. Evolution of the erosion stages was described based on water-hammer pressure, stress waves, radial wall jetting, and hydraulic penetration modes. The initial erosion stages were mainly influenced by water-hammer pressure and stress waves, whereas the intermediate erosion stages were influenced by the combination of the four modes together. The final erosion stages contain the four modes, however the erosion was greatly driven by the radial jetting and hydraulic penetration modes, where more OPEN ACCESSMetals 2015, 5 1463 material was removed. The failure mechanism of the final stages of the LIE test of both DR-treated and non-treated Ti64 was characterized as fatigue fracture. However, a brittle fracture behavior was observed in the initial and intermediate erosion stages of the DR-treated Ti64, whereas a ductile fracture behavior was observed in the non-treated Ti64. This was concluded from the micrographs of the LIE damage through different erosion stages.

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Section: Surface Roughness and Microhardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water Impingement Erosion of Deep-Rolled Ti64

Mostafa

Kevorkov

et al. 2015

Metals

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“…Анализ работ отечественных и зарубежных ис-следователей показывает, что повышение износо-стойкости титановых сплавов может быть достиг-нуто созданием функциональных покрытий [3][4][5], поверхностным легированием [6], термической [7,8] и термомеханической обработкой [9,10], а также комбинированными методами обработки [11].…”

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Hardening and welding with a fiber laser as the methods of purposeful formation of the structure and properties of VT6 titanium alloy

Горунов¹,

Gil'mutdinov²

2015

Izv. VUZ. Poroshk. Met.

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40Модифицирование поверхности, в том числе пучками заряженных частиц, потоками фотонов и плазмы Известия вузов. Порошковая металлургия и функциональные покрытия 4 2015 Введение В изделиях современного авиа-и машиностро-ения широкое применение находят титановые α + β-сплавы благодаря высоким прочностным и антикоррозионным свойствам, а также хорошей свариваемости. Они используются в крупнога-баритных сварных конструкциях летательных аппаратов [1]. Однако из-за высокой склонности к схватыванию и задиранию при работе на тре-ние скольжения их применение для изготовления УДК 621.9.048.7 DOI dx.doi. org/10.17073/1997-308X-2015-4-40-44 Упрочнение и наплавка волоконным лазером как способы целенаправленного формирования структуры и свойств титанового сплава ВТ6 © 2015 г. А.И. Горунов, А.Х. Гильмутдинов Казанский национальный исследовательский технический университет (КНИТУ) им. А.Н. Туполева Статья поступила в редакцию 13.11.14 г., доработана 24.04.15 г., подписана в печать 28.04.15 г.Приведены результаты изучения микроструктуры и твердости поверхностных слоев наплавленного с использованием воло-конного лазера никелевого сплава на титановый α + β-сплав после их комбинированного упрочнения при воздействии ла-зерного излучения. Лазерная наплавка позволяет получать покрытия с высокой твердостью и закалочными структурами в поверхностных слоях титанового сплава. Твердость наплавленного металла после высокоскоростного охлаждения с темпе-ратуры расплава на поверхности титановой подложки в 2,7 раза больше твердости мартенситного слоя, сформированного в титановом сплаве после закалки.Ключевые слова: лазерная наплавка, лазерное упрочнение, титановый сплав, микроструктура, микротвердость. The results of studying microstructure and hardness of surface layers of nickel alloy welded on titanium α + β alloy using fiber laser after their combined hardening under the effect of laser radiation are presented. Laser cladding makes it possible to form coatings with high hardness and quenching structures in surface layers of titanium alloy. Hardness of welded metal after the high-speed cooling from the melt temperature on the titanium substrate surface is larger than the density of martensite alloy formed in the titanium alloy after quenching.Keywords: laser cladding, laser hardening, titanium alloy, microstructure, microhardness.

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