The Effect of Shot Peening Coverage on Residual Stress, Cold Work and Fatigue in a Ni‐Cr‐Mo Low Alloy Steel

Prevéy, Paul S.; Cammett, John T.

doi:10.1002/3527606580.ch37

Cited by 36 publications

(44 citation statements)

References 3 publications

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“…While use of material from a fatigue tested coupon was not ideal, our experience in similar tests suggested the fatigue loads would not cause significant stress relaxation. This is consistent with earlier work, which showed that residual stress relaxation in SP, high‐strength steel coupons is negligible when the applied cyclic stress is in bending, the maximum stress is lower than monotonic yield strength, and R > 0 8 . The slitting method was applied differently for the SP coupon, in order to capture the shallow residual stress profile typical of shot peening.…”

Section: Methodssupporting

confidence: 88%

“…This is consistent with earlier work, which showed that residual stress relaxation in SP, high-strength steel coupons is negligible when the applied cyclic stress is in bending, the maximum stress is lower than monotonic yield strength, and R > 0. 8 The slitting method was applied differently for the SP coupon, in order to capture the shallow residual stress profile typical of shot peening. Following the earlier work of Cheng and Finnie, 9 a small strain gage was mounted on the front of the block, next to the slit, to provide strain versus depth data.…”

Section: Residual Stress Measurementmentioning

confidence: 99%

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Effect of laser peening on fatigue performance in 300M steel

Pistochini

Hill

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T This study investigated and quantified the ability of laser peening to extend fatigue life and mitigate common fatigue crack nucleation mechanisms including foreign object damage and stress corrosion cracking in high strength, 300M steel. Residual stress was measured and fatigue tests were completed for as-machined, shot peened and laser peened coupons tested under a variety of conditions including in a corrosive environment and with simulated foreign object damage. The results are compared to available reference data studying the application of another emerging surface treatment, low plasticity burnishing, to the same material (300M steel) and in similar coupons. Laser peening resulted in large stress-life improvements in each condition, with a 54% increase in fatigue strength in an air environment for laser peened coupons at a lifetime of one million cycles. Additional fatigue testing in the 300M program showed that laser peening mitigated fatigue strength losses and improved the lifetimes (relative to as-machined, air environment) for coupons subject to either a corrosive environment or simulated FOD. Performance of laser peened coupons under all conditions proved to be better than reference data for coupons treated with shot peening or low plasticity burnishing.Keywords foreign object damage; high strength steel; 300M steel; laser peening; shot peening; stress corrosion cracking. N O M E N C L A T U R Ea = semi-elliptical surface flaw depth c = semi-elliptical surface flaw half width C = material constant in Paris-Erdogan law da/dN = fatigue crack growth rate K Ic = plain strain fracture toughness in Mode I K min = minimum cyclic stress intensity factor K max = maximum cyclic stress intensity factor K rs = residual stress intensity factor K w = Walker effective stress intensity factor range m = Walker exponent for effective stress intensity factor range m + = Walker exponent for positive stress ratio m − = Walker exponent for negative stress ratio n = material constant in Paris-Erdogan law R = stress ratio S y = yield strength γ = Walker exponent for equivalent stress amplitude σ ar = equivalent, fully reversed cyclic stress amplitude σ max = maximum applied cyclic stress σ min = minimum applied cyclic stress σ rs = residual stress

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Section: Methodssupporting

confidence: 88%

Section: Residual Stress Measurementmentioning

confidence: 99%

Effect of laser peening on fatigue performance in 300M steel

Pistochini

Hill

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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“…As shown in Table , the shot peening system produced a consistent value of surface residual stress on the flat specimens at all the coverage levels used in this work, with a mean value of 566 MPa and a standard deviation of 16.4 MPa. This observation is supported both by the work by Prevéy and Cammett on 4340 steel plate, who found that no systematic variation occurred in the residual stress profile once the coverage value exceeded 20%, and by the results of the SXRD work. It should be noted that for the flat and fir‐tree specimens, the residual stress field is essentially uniform biaxial, with very similar values being observed in both the longitudinal and transverse directions.…”

Section: Residual Stress Measurementssupporting

confidence: 67%

Finite element modelling of residual stresses in shot‐peened steam turbine blades

Newby

James

Hattingh

2014

Fatigue Fract Eng Mat Struct

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The attachment region in steam turbine blades is critical to structural integrity, and hence, surface treatment by shot peening or roller burnishing is commonly used to induce compressive residual stresses in the fir‐tree region of the blade. In particular, the last stage blades on the low pressure rotors present the highest risk in terms of catastrophic failure due to their size and operating conditions. These blades have a mass of some 24 kg and operate in a wet steam environment at approximately 60 °C while rotating at 3000 rpm; potential failure modes include high and low cycle fatigue, stress corrosion cracking and corrosion fatigue. This paper reports the development of, and results obtained from, an elastic‐perfectly plastic finite element model of the residual stresses in the attachment region of a last stage blade and the influence on these compressive stresses of fatigue cycling. The model uses thermal quenching to simulate the residual stress profile obtained in the fir‐tree serrations after shot peening. Results were validated via extensive synchrotron and laboratory X‐ray diffraction measurements of the residual stress in shot‐peened specimens.

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“…later added a comparison with thermal relaxation of LSP surface stresses at 572 °F (300 °C) and 842 °F (450 °C). Prevéy and Cammett 65 studied thermal relaxation for different shot peening coverages in 4340 steel at 475 °F (246 °C) after 24 h. Surface and near‐surface relaxation was minor (10 to 30%) and residual stresses were generally stable below a depth of about 0.004 in. Tufft 18 found only minor changes in SP residual stresses for Marage 250 steel after 16 h at 250 °F (121 °C), 400 °F (204 °C) and 600 °F (316 °C).…”

Section: Peening and Related Surface Treatmentsmentioning

confidence: 99%

A literature survey on the stability and significance of residual stresses during fatigue

McClung

2007

Fatigue Fract Eng Mat Struct

300

181

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A B S T R A C T Many manufacturing processes can induce residual stresses in components. These residual stresses influence the mean stress during cyclic loading and so can influence the fatigue life. However, the initial residual stresses induced during manufacturing may not remain stable during the fatigue life. This paper provides a broad and extensive literature survey addressing the stability of surface and near-surface residual stress fields during fatigue, including redistribution and relaxation due to static mechanical load, repeated cyclic loads, thermal exposure and crack extension. The implications of the initial and evolving residual stress state for fatigue behaviour and life prediction are addressed, with special attention to fatigue crack growth. This survey is not a critical analysis; no detailed attempt is made to evaluate the relative merits of the different explanations and models proposed, to propose new explanations or models or to provide quantitative conclusions. Primary attention is given to the residual stresses resulting from four major classes of manufacturing operations: shot peening and related surface treatments, cold expansion of holes, welding and machining. A = function of material and temperature C = empirical constant CX = cold expansion DOD = Department of Defence DR = deep rolling EP = electropolished FAA = Federal Aviation Administration FCG = fatigue crack growth FE = finite element FTI = Fatigue Technology, Inc. GBP = glass bead peening GP = gravity peening JSSG = Joint Service Specification Guide k = Boltzmann's constant LBP = low plasticity burnishing LCF = low-cycle fatigue LSP = laser shock peening m = empirical constant Correspondence: R. C. McClung. Fatigue Fract Engng Mater Struct 30, 173-205 173 174 R. C. McCLUNG Q = effective activation energy for residual stress relaxation R = stress ratio S-N = Stress-Life SP = shot peening SR = stress relieved t = time T = Temperature USAF = United States Air Force WP = water peening σ RS = residual stress 3D = three-dimensional

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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

Cited by 36 publications

References 3 publications

Effect of laser peening on fatigue performance in 300M steel

Effect of laser peening on fatigue performance in 300M steel

Finite element modelling of residual stresses in shot‐peened steam turbine blades

A literature survey on the stability and significance of residual stresses during fatigue

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