| The Effect of Shot Peening Coverage on Residual Stress, Cold Work, and Fatigue in a Nickel-Base Superalloy |
SEP 2005 |
6 pages |
| Authors:
J. T. Cammett; P. S. Prevey; N. Jayaraman; LAMBDA RESEARCH CINCINNATI OH
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 | The goal of this work was to determine effects of shot peening (SP) coverage on the compressive residual stress magnitude, depth, and relaxation of residual stresses due to thermal exposure, as well as fatigue strength of IN718, a nickel-base superalloy. The residual stress-depth profiles (both depth of compression and magnitude) for coupons shot peened to different coverage levels of 82% (0.2T where T = time to achieve full area coverage) ... |
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| Improved Damage Tolerance of Ti-6Al-4V Aero Engine Blades and Vanes Using Residual Compression by Design |
2005 |
11 pages |
| Authors:
N. Jayaraman; P. S. Prevey; R. Ravindranath; LAMBDA RESEARCH CINCINNATI OH
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| The deep stable layer of compressive residual stress produced by low plasticity burnishing (LPB) has been demonstrated in laboratory testing to improve damage tolerance in engine alloys IN718, Ti-6Al-4V, Ti-6-2-4-6, and 17-4PH. This paper describes the fatigue and FOD tolerance benefits afforded by LPB treatment of a Ti-6Al-4V first stage fan blade and vane. FOD sensitive blades and vanes removed from fielded engines were LPB processed to protect the leading ... |
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| Improved Damage Tolerance in Titanium Alloy Fan Blades With Low Plasticity Burnishing |
OCT 2002 |
10 pages |
| Authors:
P. S. Prevey; D. J. Hornbach; T. L. Jacobs; R. Ravindranath; LAMBDA RESEARCH CINCINNATI OH
|
| Low Plasticity Burnishing (LPB) has been applied to produce a layer of deep high magnitude compressive residual stress in the leading edge of Ti-6Al-4V first stage fan blades. The goal was to improve damage tolerance from 0.13 to 0.5 mm (0.005 to 0.02 in.). LPB processing of the airfoil surface was performed on a conventional four-axis CNC mill. The LPB control system, tooling, and process are described. A zone of ... |
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| Damage Tolerance Improvement of Ti-6-4 Fan Blades With Low Plasticity Burnishing |
SEP 2002 |
10 pages |
| Authors:
P. S. Prevey; D. J. Hornbach; J. T. Cammett; R. Ravindranath; LAMBDA RESEARCH CINCINNATI OH
|
| Low plasticity burnishing (LPB) has been demonstrated to increase the damage tolerance of Ti- 6Al-4V fan blades by an order of magnitude. First stage Ti-6Al-4V fan blades were LPB processed using a conventional 4-axis CNC machine tool. LPB dramatically improved surface finish with negligible blade distortion and produced compressive residual stresses of -690 MPa (-100 ksi) through the entire thickness of the blade leading edge. Fatigue testing demonstrated that the ... |
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| The Effect of Shot Peening Coverage on Residual Stress, Cold Work and Fatigue in a Ni-Cr-Mo Low Alloy Steel |
SEP 2000 |
7 pages |
| Authors:
P. S. Prevey; J. T. Cammett; LAMBDA RESEARCH CINCINNATI OH
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| The underlying motivation for this work was to test the conventional wisdom that 100% coverage by shot peening is required to achieve full benefit in terms of compressive residual stress magnitude and depth as well as fatigue strength. Fatigue performance of many shot peened alloys is widely reported to increase with coverage up to 100%, by many investigators and even in shot peening manuals.(1) The fatigue strength of some alloys ... |
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