Surface modifications induced by shot peening and their effect on the plane bending fatigue strength of a Cr–Mo steel produced by powder metallurgy

Molinari, A.; Santuliana, E.; Cristofolini, I.; Rao, A.C. Umamaheshwer; Libardi, S.; Marconi, P.

doi:10.1016/j.msea.2010.12.072

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…Shot peening of ferrous PM materials has given rise to significant sub-surface densification in some instances, with Molinari et al (2011) finding shot peening to create essentially a fully dense surface layer continuing to a depth of approximately 50 m in a Cr-Mo steel with bulk sintered density of ≈90%. In an attempt to determine if a similar phenomenon had occurred in PM7075-T6, the microstructures beneath sintered and sintered/peened surfaces were examined using optical metallography (Fig.…”

Section: Surface Assessmentmentioning

confidence: 99%

Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

Harding

Donaldson²,

Hexemer³

et al. 2015

Journal of Materials Processing Technology

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Section: Surface Assessmentmentioning

confidence: 99%

Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

Harding

Donaldson²,

Hexemer³

et al. 2015

Journal of Materials Processing Technology

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“…The load-bearing surface is M r2 = 0.82. Combining Equations (8)(9)(10)(11), the critical pore size responsible for surface crack nucleation may be calculated and plotted, along with the tensile stress, as a function of the mean pressure when friction coefficient is 0.014, as in all the tests carried out on the carburised rings. The higher the mean pressure, the higher the tensile stress and the smaller the pore size that is expected to cause the formation of a surface crack.…”

Section: Resultsmentioning

confidence: 99%

“…However, the combination of a high hardness, as that attained in the surface of carburised steels, and the residual porosity may lead to a brittle behaviour, since pores may behave as pre-existing cracks when the matrix microhardness exceeds a threshold that depends on the pore size [9]. Shot peening may further increase wear and fatigue resistance of sintered steels, due to surface densification and the resulting strain hardening and to the accumulation of compressive residual stresses on the surface layers [10,11]. In particular, compressive residual stresses may eliminate the tensile stress responsible for the brittle cracks formation.…”

Section: Introductionmentioning

confidence: 99%

Damage phenomena in lubricated rolling-sliding wear of a gas carburised 0.85%Mo low-alloyed sintered steel: theoretical analysis and experimental verification

Tesfaye

Molinari

Pahl³

2017

Powder Metallurgy

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The resistance to surface and subsurface damage during lubricated rolling-sliding wear of a carburised low-alloy sintered steel and the effect of shot peening were investigated. The formation of both contact fatigue cracks and of brittle tensile cracks may be predicted by a theoretical model that was experimentally validated. Carburising is effective in increasing the resistance to contact fatigue, but pores in a hard and brittle matrix may act as pre-existing cracks. Shot peening increases the contact fatigue resistance since compressive residual stresses oppose the nucleation of surface cracks.

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“…It is a process that is used very effectively to enhance fatigue life of materials. For example, the effect on the plane bending fatigue strength of a Cr-Mo steel produced by powder metallurgy was examined [5]. In shot peening, bombarding the surface with steel shot propelled at high velocity causes plastic deformation of surface.…”

Section: Introductionmentioning

confidence: 99%

Bondability of Dissimilar Metal Sheets by Shot Peening

Harada¹,

Nunobiki²

2013

MSF

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In shot peening, bombarding the surface with steel shot propelled at high velocity causes plastic deformation of surface. The process with the characteristic deformation was applied to joining process. Our approach has been applied to the butt joining of the dissimilar metal sheets. In this method, however, the joint strength was lower than the flow stress of base metal. The modified joining processing was being carried out to improve the bondability. In the present study, the joining of dissimilar metal sheets using a shot peening process was investigated to improve the bondability. In the joined section, the edge of the joint area of the sheets were slit using a laser. In this method, the edges of the sheet are overlapped the other sheet. When the connection is peened, the material undergoes large plastic deformation near the surface due to the collision of shots. In this process, particularly noteworthy is the plastic flow near surface layer. The edges of the sheet are joined to the other sheet, thus two sheets can be joined each other. In the experiment, the shot peening treatment was performed by using an air-type peening machine. The shots used were made of high carbon cast steel. Air pressure was 0.6 MPa and peening time was in the range of 30-240s. The metal sheets were commercial low-carbon steel, stainless steel, pure aluminium, aluminium alloy, and pure copper. The effects of processing conditions on the bondability were mainly examined. It was found that the present method was effective for joining of dissimilar metal sheets.

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Surface modifications induced by shot peening and their effect on the plane bending fatigue strength of a Cr–Mo steel produced by powder metallurgy

Cited by 15 publications

References 23 publications

Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

Characterization of the microstructure, mechanical properties, and shot peening response of an industrially processed Al–Zn–Mg–Cu PM alloy

Damage phenomena in lubricated rolling-sliding wear of a gas carburised 0.85%Mo low-alloyed sintered steel: theoretical analysis and experimental verification

Bondability of Dissimilar Metal Sheets by Shot Peening

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