On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti–6Al–4V at elevated temperatures up to 550°C

Altenberger, I.; Nalla, Ravi K.; Sano, Yuji; Wagner, Lothar; Ritchie, Robert O.

doi:10.1016/j.ijfatigue.2012.03.008

Cited by 247 publications

(112 citation statements)

References 39 publications

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“…Responsible mechanisms are inhomogeneous elastic-plastic deformations and possible phase transformations leading to cold working and cre-reported in the literature [1][2][3][4][5][6][7][8]. However, besides the positive effects of mechanical surface treatments on hardness and residual stresses, negative effects on the surface topography might occur.…”

Section: Introductionmentioning

confidence: 99%

“…However, besides the positive effects of mechanical surface treatments on hardness and residual stresses, negative effects on the surface topography might occur. This can lead to a lower potential for fatigue endurance increase [3]. Moreover, sticking shots that might take place for SP techniques could lead to early failure in the case of gears and therefore require careful control and cleaning of the workpieces.…”

Section: Introductionmentioning

confidence: 99%

“…The principle is based on very short, high-energy laser pulses inducing a plasma in an ablative layer (or at the surface of the material itself) leading to the propagation of a nearly planar shockwave within the treated material [3,7,8]. Due to this, very high peening depths can be reached (up to several mm).…”

Section: Introductionmentioning

confidence: 99%

“…Due to this, very high peening depths can be reached (up to several mm). Up to now, this method has been mostly used at ductile materials like aluminium, titanium or austenitic steels but only few results are known for high-strength steels [3,7,8]. In the present study, systematic investigations on the effect of WJP and LSP on residual stresses, surface topography and resulting fatigue properties were performed with case-hardened, notched model-samples (as simplified model for gear teeth) made of 18CrNiMo7-6 and compared to SP, performed with two different sets of parameters.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Alternative Peening Methods for the Improvement of Fatigue Properties of Case-Hardened Steel Parts

Épp

Zoch

2016

HTM Journal of Heat Treatment and Materials

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In this study, the methods of Water Jet Peening (WJP) and Laser Shock Peening (LSP) were compared to Shot Peening (SP) and investigated in terms of induced residual stresses (RS), microstructure, surface topography and fatigue properties for a case-hardened steel. Different modifications of the surface topography were observed for the different peening methods: after SP, a strong plastic deformation of the surface occurred while the LSP had only a minimal influence on surface topography. After WJP with very high pressure (4500 bar), microscopic damages can occur at the surface. SP leads to the highest compressive RS (up to −1650 MPa) with a maximal affected depth of about 170 μm. After WJP, maximum RS of about −1000 MPa with very low depth (50 μm) are present, while the LSP leads to very large affected depths (< 1 mm) and RS of about −1300 MPa. In terms of fatigue properties, the SP process shows the highest improvement compared to the heat treated state (+47 %) while the LSP and the WJP leads to an improvement of +15 % and +23 % respectively but with larger scatter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Alternative Peening Methods for the Improvement of Fatigue Properties of Case-Hardened Steel Parts

Épp

Zoch

2016

HTM Journal of Heat Treatment and Materials

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“…The ability of DCR to generate high cold work at the near surface as well deep compressive residual stresses makes it a good choice for mechanical surface treatment. DCR creates a nanocrystalline surface layer in the range of 3µm [4]. The nanocrystalline structure acts as a good resistance to fatigue crack initiation up to a moderate temperature but deteriorates the creep resistance at elevated temperature [4].…”

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confidence: 99%

Residual Stress and Contact Force Study for Deep Cold Rolling of Aero-engine Material

Prithiviraj

Wang

2016

Residual Stresses 2016

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Abstract. Deep Cold Rolling (DCR) process is used in various industries to improve the fatigue life of metallic parts by introducing work hardening, deep layer of compressive residual stresses and polished surface finish. In this paper, the influences of the angled design for a hydrostatic tool and its indentation depth to impart compressive residual stresses are studied and compared to its straight tool counterpart for treatment of IN718 material. Residual stress depth profile measurements, using the XRD technique, were employed to determine differences caused by using the angled and straight tool design. Higher rolling forces are measured in an angled tool design with a high indentation depth as compared to a straight tool design caused by the slip stick effect on the internal parts of the tool. This leads to high plastic deformation in the test material significantly affecting the compressive residual stress depth profile depending on its exisiting state. IntroductionAero engine metallic parts experience high levels of mechanical and thermal loading, high and low cycle fatigue and foreign object damage (FOD) [1] in service that can lead to early retirement. Suitable mechanical surface treatments applied onto aero engine metallic parts can prolong fatigue life, improve wear resistance and avoid stress corrosion by introducing work hardening, deep compressive residual stresses and polished surface finish [1,2].Commonly used mechanical surface treatments in the aero engine manufacturing industry are shot peening (SP) and laser shock peening (LSP). Deep cold rolling (DCR), another mechanical surface treatment, uses a rolling ball element that is pressed at high pressure against a metallic part to impart a deep layer of compressive residual stress. Its process parameters that significantly affect the mechanical properties are hydrostatic pressure, rolling tool, contact angle of the tool, stepover, feed rate, yield strength and geometry of the material [6,7]. DCR is a cost effective localised treatment process that can be easily integrated to a robot arm or CNC platform. SP and DCR, are capable of generating high dislocation densities in the near surface regions that inhibit crack initiation although the residual stresses tend to relax faster when the part experiences high temperatures [1,3,4,5]. Deep compressive residual stresses are achieved through LSP and DCR, which help to arrest the crack during the crack propagation stage after FOD impacts and corrosion damages [1,2]. The ability of DCR to generate high cold work at the near surface as well deep compressive residual stresses makes it a good choice for mechanical surface treatment. DCR creates a nanocrystalline surface layer in the range of 3µm [4]. The nanocrystalline structure acts as a good resistance to fatigue crack initiation up to a moderate temperature but deteriorates the creep resistance at elevated temperature [4].The magnitude of the rolling force applied on to the part is a combined effect of the hydrostatic pressure, ball diameter and contact an...

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Recent Developments and Novel Applications of Laser Shock Peening: A Review

2021

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Wear, corrosion, and fatigue are responsible for more than 80% of the failures of metallic materials. As most failures caused by wear, corrosion, and fatigue initiate from the material surface, surface integrity has a crucial impact on the overall performance of the materials. Surface integrity characteristics, including hardness, microstructure, morphology, roughness, and residual stress status, can significantly affect the wear and corrosion behavior. By improving hardness and introducing beneficial compressive residual stresses in the near-surface region, laser shock peening (LSP) can significantly improve the fatigue performance of metallic materials. In the LSP process, light from a high-energy pulsed laser penetrates through the transparent confinement media and irradiates the ablative coating, quickly heating the affected area to a high temperature and generating high-pressure plasma. The expansion of the plasma causes a shockwave that can plastically deform the target metals, resulting in work hardening and compressive residual stresses. Compared with shot peening (SP), LSP has the following advantages. 1) LSP can produce deeper layers of compressive residual stresses; 2) the process parameters in LSP can be precisely controlled; 3) the surface integrity of the parts after LSP is improved without the need for postprocessing; 4) LSP can be used to treat components with complex geometry; and 5) LSP has a high processing efficiency and makes for a clean working environment. Because LSP represents a new generation of surface strengthening technology that can replace SP, it has gained wide attention. Askar'yan and Moroz measured the pressures exerted by a high-intensity laser beam on the surface of a metal target [1] and found that this pressure is sufficient for steering space vehicles. However, the experiments were conducted under vacuum conditions to prevent dielectric breakdown, and such conditions are not practical for use in industry. [2] Anderholm at Sandia Laboratories irradiated an aluminum film covered in quartz with a laser beam and found that the presence of a transparent confinement layer can significantly increase the shock pressure. [3] Although this experiment was also conducted in vacuum, it proved that with the presence of a transparent confinement layer, a laser power density that does not cause dielectric breakdown in air can also generate a sufficiently large shock pressure. This observation is of great significance for the later industrial applications that involve laser-generated shockwaves.Fairand et al. at Battelle Memorial Institute changed the microstructure of 7075 aluminum alloy through short-pulse, laser-induced shockwaves with a high power density, and they found that after processing, the stress corrosion cracking (SCC) resistance and fatigue performance of the alloy improved. [4] This is a key event in the development of LSP; after this study, the National Science Foundation of the United States began to support the investigation of LSP. Clauer et al. [5] changed the intensity ...

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On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti–6Al–4V at elevated temperatures up to 550°C

Cited by 247 publications

References 39 publications

Comparison of Alternative Peening Methods for the Improvement of Fatigue Properties of Case-Hardened Steel Parts

Comparison of Alternative Peening Methods for the Improvement of Fatigue Properties of Case-Hardened Steel Parts

Residual Stress and Contact Force Study for Deep Cold Rolling of Aero-engine Material

Recent Developments and Novel Applications of Laser Shock Peening: A Review

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