Experimental Investigation on the Effect of Shot Peening and Deep Rolling on the Fatigue Response of High Strength Fasteners

Reggiani, Barbara; Olmi, Giorgio

doi:10.3390/met9101093

Cited by 16 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternating bending preliminary tests showed little or no crack growth before component failure occurred. It has been shown that the SP compressive effect surpasses rugosity´s negative effects incrementing fatigue life [28], [29]. Therefore, choosing the option that maximizes the S-N span of the component makes sense.…”

Section: Discussionmentioning

confidence: 99%

Microhardness Profile and Residual Stresses Evaluation in a Shot Peened SAE 5160H Steel

Viloria-Estrada,

Mantilla-Nova,

García-Salinas

et al. 2024

Rev UIS ing

View full text Add to dashboard Cite

Shot peening (SP) is a surface cold hardening process used on metals to enhance life under cyclic stress. In this case, SP was applied to SAE5160H samples of steel quenched tempered in oil at 460 °C used for leaf springs. This study shows the residual surface stresses measured through X-ray diffraction (XRD) and the microhardness variation through the perpendicular-to-the-peened surface using a combination of metallographic preparation and Vickers microhardness (HVN). This combination of techniques makes possible measuring the SP effect in perpendicular-to-the-treated surface. A residual stress of -365.8 ± 78 MPa measured by XRD and a maximum microhardness of 525± at 92.7 HVN on the surface were obtained for the SP material. Alternatively, an average of 54.2 ± 54.3 MPa residual stress measured by XRD and 433 ± 39.5 HVN were obtained for the As-it-is samples. In addition, corrosion electrochemical potential tests showed that SP increases the corrosion potential, which makes this process undesirable if the SP component is exposed to aggressive environments. Moreover, the As-it-is samples presented not statistically significant HVN difference in the measured points. The combination of experimental techniques allows estimating hardness change in perpendicular-to-the treated surface separated by as little as 10 µm but with a simpler specimen preparation than other techniques such as XRD or strain gauges. Such a combination can be an alternative for estimating residual stresses through depth.

show abstract

Section: Discussionmentioning

confidence: 99%

Microhardness Profile and Residual Stresses Evaluation in a Shot Peened SAE 5160H Steel

Viloria-Estrada,

Mantilla-Nova,

García-Salinas

et al. 2024

Rev UIS ing

View full text Add to dashboard Cite

show abstract

“…The material mechanical properties were initially assessed by static tensile tests, which led to the estimation of a tensile strength ranging between 1300 MPa and 1350 MPa and of an average 1100 MPa yield point, with 9% as minimum percentage elongation at fracture. In addition, screws with the same specifications were involved in a fatigue testing campaign, as described in [17].…”

Section: Methodsmentioning

confidence: 99%

“…Their comparison led to the selection of the 35% incremented load that was able to maximize the fatigue strength. Further details are available in [17]. Two photos depicting a typical device for deep-rolling with 120 • spaced rollers (screw to be applied at the centre) and a stage of the treatment are shown in Figure 2a,b.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the present study focuses on the achievable friction reduction through suitable treatments of shot-peening. This treatment was also coupled to deep-rolling, which is usually applied to these kinds of screws, to enhance their fatigue response [17]. The response of combined treatments was, therefore, assessed experimentally, thus considering the usual processing of con-rod screws and trying to replicate their actual service conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

Croccolo

Agostinis

Fini

et al. 2020

Metals

View full text Add to dashboard Cite

Bolted joints are highly loaded components and serious issues may arise from improper fastening and in particular from too high or too low preload. Friction at the underhead plays an important role, as it significantly affects the achievable preload for fixed and controlled tightening torque. In addition, multiple tightening is usually performed on connecting rod screws, which may be a further source of friction increment. This study investigates the effect of two surface treatments, shot-peening and deep-rolling, on the tribological properties upon bolt fastening. This topic was tackled experimentally and the campaign involved MJ9 X 1 4 g grade 13.9 36 NiCrMo connecting rod screws, in both lubricated and dry conditions. The results, processed by statistical tools, indicate that deep-rolling does not affect friction, whereas shot-peening yields significant benefits. As an effect of the generation of dimples and multiple contacts, it is able to lower (up to 25%) the bearing frictional coefficient in lubricated conditions, also making the friction level independent of the number of re-tightenings. For a dry surface, an even higher friction decrease (up to 30%) is achieved. Without lubrication, the friction coefficient keeps increasing for the incremented number of tightenings, but the increase rate is lowered with respect to the untreated surface.

show abstract

“…The bulk of the studies pertaining to DR were on standard test specimens or similar components because of the obvious limitations of tooling and experimentation for application prototypes. Nevertheless, there are satisfactory efforts available on DR of components such as turbine/compressor blades [104][105][106], aircraft structural components [8,21], axels [107][108][109], shafts [110,111], crankshafts [112][113][114], tension bolts [115], high-strength fasteners and threaded parts [116,117], connecting rod screws [118], torsion bars [119,120], gear tooth [83], roller and thrust bearing race/rings [78,96,121], welded joints [122][123][124][125][126], blanking punch fillets [22], hip implants [26,27], etc. When deep-rolled, all these applications exhibited significant improvement in fatigue performance, which was attributed to substantial strain hardening, higher magnitude and deeper penetration of CRS, tailored surface region microstructure, and increased boundary layer hardness along with an improved surface finish.…”

Section: The Deep Rolling Processmentioning

confidence: 99%

Deep Rolling Techniques: A Comprehensive Review of Process Parameters and Impacts on the Material Properties of Commercial Steels

Noronha,

Sharma,

Prabhu Parkala

et al. 2024

Metals

View full text Add to dashboard Cite

The proposed review demonstrates the effect of the surface modification process, specifically, deep rolling, on the material surface/near-surface properties of commercial steels. The present research examines the various process parameters involved in deep rolling and their effects on the material properties of AISI 1040 steel. Key parameters such as the rolling force, feed rate, number of passes, and roller geometry are analyzed in detail, considering their influence on residual stress distribution, surface hardness, and microstructural alterations. Additionally, the impact of deep rolling on the fatigue life, wear resistance, and corrosion behavior of AISI 1040 steel is discussed. Engineering components manufactured by AISI 1040 steel can perform better and last longer when deep rolling treatments are optimized with an understanding of how process variables and material responses interact. This review provides critical insights for researchers and practitioners interested in harnessing deep rolling techniques to enhance the mechanical strength and durability of steel components across diverse industrial settings. In summary, the valuable insights provided by this review pave the way for continued advancements in deep rolling techniques, ultimately contributing to the development of more durable, reliable, and high-performance steel components in diverse industrial applications. The establishment of generalized standardizations for the deep rolling process proves unfeasible because of the multitude of controlling parameters and their intricate interactions. Thus, specific optimization studies tailored to the material of interest are imperative for process standardization. The published literature on the characterization of surface and subsurface properties of deep-rolled AISI 1040 steel, as well as process parameter optimization, remains limited. Additionally, numerical, analytical, and statistical studies and the role of ANN are limited compared with experimental work on the deep rolling process.

show abstract

Experimental Investigation on the Effect of Shot Peening and Deep Rolling on the Fatigue Response of High Strength Fasteners

Cited by 16 publications

References 25 publications

Microhardness Profile and Residual Stresses Evaluation in a Shot Peened SAE 5160H Steel

Microhardness Profile and Residual Stresses Evaluation in a Shot Peened SAE 5160H Steel

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

Deep Rolling Techniques: A Comprehensive Review of Process Parameters and Impacts on the Material Properties of Commercial Steels

Contact Info

Product

Resources

About