Fatigue Properties of Steels with Ultrasonic Attrition Treated Surface Layers

Uusitalo, Juha; Karjalainen, L.P.; Retraint, Delphine; Palosaari, Mikko

doi:10.4028/www.scientific.net/msf.604-605.239

Cited by 24 publications

(22 citation statements)

References 26 publications

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“…Therefore, the formation of those ultrafine-grains should be due to microstructural changes introduced by the high local plastic deformation. This agrees with the results by Uusitalo et al [37] and Thiriet et al…”

Section: Figure 4 A) Cross-section Electron Backscattered Diffractiosupporting

confidence: 94%

“…Uusitalo et al [37] reported an ultrafine-grain layer of a thickness around 10 m for both a stable austenitic steel (AISI 316L) and the same metastable grade used in the present work, i.e., AISI 301LN. A similar layer, although of higher thickness (75 m), was measured by Thiriet et al [38] on AISI 316L.…”

Section: Figure 4 A) Cross-section Electron Backscattered Diffractiomentioning

confidence: 56%

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Effect of shot peening on metastable austenitic stainless steels

Fargas

Roa

Mateo

2015

Materials Science and Engineering: A

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In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with a fully austenitic microstructure, and cold rolled, consisting of a mixture of austenite and martensite. X-ray diffraction, electron backscattered diffraction and focus ion beam, as well as nanoindentation techniques, were used to elucidate deformation mechanisms activated during shot peening and correlate with fatigue response. Results pointed out that extensive plastic deformation and phase transformation developed in annealed specimens as a consequence of shot peening.However, the increase of roughness and the generation of microcracks led to a limited fatigue limit improvement. In contrast, shot peened cold rolled specimens exhibited enhanced fatigue limit. In the latter case, the main factor that determined the influence on the fatigue response was the distance from the injector, followed successively by the exit speed of the shots and the coverage factor.

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Section: Figure 4 A) Cross-section Electron Backscattered Diffractiosupporting

confidence: 94%

Section: Figure 4 A) Cross-section Electron Backscattered Diffractiomentioning

confidence: 56%

Effect of shot peening on metastable austenitic stainless steels

Fargas

Roa

Mateo

2015

Materials Science and Engineering: A

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“…From the data, it can be seen that the stress amplitude, which does not result in failure in 2 × 10 6 cycles, termed as fatigue stress limit (FL) here, has been determined as 400 MPa for all TWIP steels. For comparisons, the S-N curves of two commercial austenitic stainless steels, Types 301LN and 316L, are also inserted, obtained in similar fatigue testing, showing FL of about 350 and 300 MPa, respectively [19]. For Types 304 and 316 stainless steels, FL of 240 and 270 MPa, respectively, have been reported in reverse Table 2 Quasi-static tensile properties (the yield strength, tensile strength and total elongation) of the TWIP steels and three austenitic stainless steels [18].…”

Section: Initial Microstructures and Mechanical Propertiesmentioning

confidence: 99%

Fatigue behavior of high-Mn TWIP steels

Hamada

Karjalainen

Puustinen

2009

Materials Science and Engineering: A

133

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“…Bending stress vs cycles to failure curves of the investigated TWIP steels and those of 301LN, 316L, and high-strength TRIP steels used for comparison [13,14]. Relationship between the FL and tensile strength of steels fromFig.…”

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confidence: 99%

Fatigue Behavior of Four High-Mn Twinning Induced Plasticity Effect Steels

Hamada

Karjalainen

Ferraiuolo

et al. 2010

Metall Mater Trans A

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Fatigue behavior of four high-Mn (18 to 22 wt pct Mn) steels, after cold rolling and soft annealing, were investigated in reversed plane bending in a high-cycle regime. The surfaces of fatigued specimens were examined using an optical microscope, a scanning electron microscope (SEM), and an atom force microscope (AFM). It was discovered that the chemical composition of the steel had only a minor influence on fatigue behavior, and the fatigue limit (FL), i.e., the stress amplitude leading to more than 2AE10 6 cycles to failure, of all steels is about 400 MPa. This is about 42 to 48 pct of their tensile strength whose value is comparable to that of austenitic stainless steel and 780 MPa transformation induced plasticity (TRIP) steel. Mechanical twinning does not occur in the course of cycling; however, intense slip bands are formed. Fatigue cracks tend to nucleate at quite an early stage of fatigue life and most commonly on grain and annealing twin boundaries due to intersections of slip bands and boundaries.Savings in fuel consumption as well as the safety of passengers demand that automotive manufacturers use new materials to enable weight reductions of vehicles and improve crash resistance. In this context, high-Mn steels showing twinning induced plasticity effect (TWIP) are a promising type of material providing high tensile strength in combination with extremely good ductility. The superductility (total elongations between 60 and 95 pct) with high tensile strength (600 to 1100 MPa) of TWIP steels are related to the tendency of mechanical twinning in straining due to a low stacking fault energy (SFE) on the order of 25 mJ/m 2 . [1,2] Several investigations [3,4] have been carried out to determine the mechanical properties of TWIP steels (Fe-Mn-Al and Fe-Mn-Al-Si) in tensile loading at low and ambient temperatures. Fabrication properties such as formability and weldability have also been studied and reported. [5]

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Fatigue Properties of Steels with Ultrasonic Attrition Treated Surface Layers

Cited by 24 publications

References 26 publications

Effect of shot peening on metastable austenitic stainless steels

Effect of shot peening on metastable austenitic stainless steels

Fatigue behavior of high-Mn TWIP steels

Fatigue Behavior of Four High-Mn Twinning Induced Plasticity Effect Steels

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