Influence of machining methods on the residual-stress distribution and fatigue strength of steel ShKh15 specimens

Smaglenko, F. P.; Gryaznov, B. A.; Gorodetskii, S. S.

doi:10.1007/bf01528372

Cited by 5 publications

(5 citation statements)

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“…Normally the residual stresses are compressive, but they can be tensile with inadequate turning parameters, and have been shown to strongly influence the fatigue limit in steels [25][26][27][28][29]. Gentle grinding can result in very high compressive surface stresses that normally drop very quickly with increasing depth and approach zero after 40 to 80 µm, giving an increased fatigue life of 20 to 25 %.…”

Section: Residual Stress Effects On Fatiguementioning

confidence: 99%

“…By screening the literature dealing with shot peening of different steels and its effects on different loadings [23,[26][27][28][29][32][33][34][35][36][37][38][39][40][41] it becomes clear that shot peening is a very effective and cost efficient post treatment to increase the fatigue strength of steels. To find the optimum shot peening conditions for the steel might be impossible without narrowing down the problem to a specific steel under specific loadings [42].…”

Section: Shot Peeningmentioning

confidence: 99%

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Residual Stresses and Fatigue of Shot Peened Cast Iron

Lundberg¹

2013

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ii Cover:Fracture surface of compact graphite iron with a graphite nodule.Printed by: LiU-Tryck, Linköping, Sweden, 2013 ISBN 978-91-7519-501-8 ISSN 0280-7971 Distributed by: Linköping University Department of Management and Engineering 581 83, Linköping, Sweden ©2013 Mattias Lundberg iii AbstractThe complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. Shot peening is often used to increase the fatigue strength of components. The benefits are associated with the compressive stresses induced and with surface hardening. In this research project, these effects on grey and compact iron have been analyzed for different shot peening parameters using XRD, SEM and fatigue testing methods. The ultimate aim of the project is to increase the fatigue strength of cast irons by optimization of residual stresses.The XRD measurements and SEM examinations revealed that the shot peening parameters including shot size and peening intensity had significant influences on the resulted residual stresses and strain hardening while changing the coverage made little difference. Also differences in the peening results between the two materials were observed, which were ascribed to an effect of the different graphite morphology. Nevertheless, a residual stress profile similar to the one general considered to improve the fatigue strength in steels could be obtained in both grey and compact iron after shot peening.The axial fatigue testing with R=-1 on the grey iron showed that peening using large shot size and high peening intensity (heavy shot peening) resulted in a fatigue strength reduction of 15-20% in comparison with the mechanically polished surface. The negative effects are likely related to surface damage and relatively high tensile residual stresses in subsurface induced by the heavy peening. Grey cast iron has low ductility in tension and therefore tensile residual stresses may promote multiple cracking and crack networking during cyclic loading.Shot peening using much smaller shots and lower intensity (gentle shot peening) which resulted in a much smaller residual stress field gave no significant changes in fatigue strength. However, a short time annealing at 285°C of specimens being gently shot peened increased the fatigue strength roughly by 10%. The improvement could be an effect of precipitates formed due to the heat treatment, which lock the dislocation movement under cyclic loading. iv v

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Section: Residual Stress Effects On Fatiguementioning

confidence: 99%

Section: Shot Peeningmentioning

confidence: 99%

Residual Stresses and Fatigue of Shot Peened Cast Iron

Lundberg¹

2013

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“…Shot peening is one of these surface treatments. Referring to the literature dealing with shot peening applied to steels and its effects under different cyclic loadings [3][4][5][6][7][8][9][10][11][12], it is nowadays clear that shot peening is a very effective and cost efficient final treatment to increase the fatigue strength of steels. This surface treatment consists in bombarding the surface of the component with a stream of small, high hardness spheres, called shots.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Shot Peening on the Surface Characteristics of 35NCD16 Alloy Steel

Benaı̈ssa

Benkhenafou

Ziadi

et al. 2020

Period. Polytech. Mech. Eng.

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Shot-peening is a surface mechanical treatment, widely used to treat metallic parts in the aerospace and automotive industries. This mechanical surface treatment should not be confused with other common applications of other peening treatments, oriented towards cleaning, preparation or surface finishing. Shot peening is a mechanical treatment used to improve the service life of metallic components, especially when they are submitted to cyclic loads. The effect of shot peening on the surface work hardening and residual stress profile of a 35NCD16 steel was studied in this work.

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“…Today we consider shot peened steels to have a maximum compressive stress peak just below the peened surface. By screening the literature dealing with shot peening of different steels and its effects on different loadings [8,[10][11][12][13][14][15][16][17][18][19][20][21][22] it becomes clear that shot peening is an effective and cost efficient post treatment to increase the fatigue strength of steels. Finding the optimum shot peening conditions for steels might be impossible without narrowing down the problem to a specific steel under specific loading conditions [23].…”

Section: Shot Peeningmentioning

confidence: 99%

“…Normally the residual stresses are compressive after conventional mechanical machining of ferrous alloys. However, with inadequate parameters the residual stresses can be tensile and have been shown to strongly influence the fatigue strength of steels [10][11][12][13]59]. Gentle grinding of the surface can result in very high compressive surface residual stresses which drop quickly with depth and approaches zero after just 40-80 µm, resulting in an increased fatigue life of 20-25 % for medium to high strength steels.…”

Section: Residual Stresses and Fatiguementioning

confidence: 99%

Residual stresses, fatigue and deformation in cast iron

Lundberg¹

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Influence of machining methods on the residual-stress distribution and fatigue strength of steel ShKh15 specimens

Cited by 5 publications

References 1 publication

Residual Stresses and Fatigue of Shot Peened Cast Iron

Residual Stresses and Fatigue of Shot Peened Cast Iron

The Effects of Shot Peening on the Surface Characteristics of 35NCD16 Alloy Steel

Residual stresses, fatigue and deformation in cast iron

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