Enhanced Fatigue Behavior in Quenched and Tempered High-Strength Steel by Means of Double Surface Treatments

Segurado, E.; Belzunce, F. J.; Fernández, I.

doi:10.1007/s11665-019-03940-4

Cited by 5 publications

(3 citation statements)

References 19 publications

(21 reference statements)

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“…Shot peening time corresponding to "5 s" for a minimum of 100% coverage. The impact angle was 90 • and 100% coverage [47][48][49]. The coverage was analyzed with the NIS-Elements BR v5.20.02 software of the optical microscope.…”

Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening and Nitriding on Toughness and Abrasive Wear Resistance of Powder Metallurgic Steels Highly Alloyed with Vanadium

González-Pociño,

García-García,

Alvarez-Antolin

et al. 2023

Metals

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Böhler K390 steel is used for cold work tools, with 9% of V, made by using powder metallurgy. In this work, it has been studied the effect of shot peening and nitriding surface treatments on wear resistance and impact toughness of this type of steel. For this purpose, previous changes in several thermal processing factors related to quenching and tempering were carried out. The results allow for an increase in the hardness, impact toughness, and abrasive wear resistance of these steels. An austenitizing treatment at 1100 °C with air cooling and 3 tempering processes at 550 °C is suggested. These conditions foster a lower weight percentage of retained austenite, up to 3%, a higher carbide percentage, up to 15–16% in weight, and a greater impact toughness with no notch, of above 40 J/cm2. If this treatment is combined with further ion nitriding, the maximum level of abrasive wear resistance is reached. The only carbide type present in the microstructure is the MC type. Most of the V, Cr, and Mo contents are present in said carbides. The Co and the W tend to remain in solid solution in the matrix constituent. Both the shot peening treatment as well as ion nitriding offer a considerable increase in hardness, with values of up to 1500–1600 HV. Nevertheless, it has been confirmed that shot peening does not offer any abrasive wear resistance improvement. Such resistance may only be considerably improved by the application of an ionic nitriding treatment. The thickness of the nitrided layer fluctuates between 150 and 175 µm. The carbides are affected by nitriding, reaching levels that are higher than the atomic 10%, at an intermediate depth of the nitrided layer. These values are higher in the matrix constituent, as they are even higher than the atomic 20% in N.

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Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening and Nitriding on Toughness and Abrasive Wear Resistance of Powder Metallurgic Steels Highly Alloyed with Vanadium

González-Pociño,

García-García,

Alvarez-Antolin

et al. 2023

Metals

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“…But the fatigue design may be affected by this highly reproductive finishing processes due to the evocation of compressive residual stresses in the surface layer [ 47 , 53 , 54 ] and a change of surface layer hardness due to small plastic deformations [ 54 , 55 ], depending on the material as well as the polishing medium. These effects of vibratory processing lead often to an increase of the long life fatigue strength [ 56 ], but may also reduce fatigue strength [ 57 ] depending on the effective residual stress state in the surface layer. Such contrary statements regarding the effects of post-manufacturing surface treatments highlight the importance of considering the effective mean stress state within the most-stressed layer properly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys

et al. 2023

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The endurance limit of structural mechanical components is affected by the residual stress state, which depends strongly on the manufacturing process. In general, compressive residual stresses tend to result in an increased fatigue strength. Post-manufacturing processes such as shot peening or vibratory finishing may achieve such a compressive residual stress state. But within complex components, manufacturing-process-based imperfections severely limit the fatigue strength. Thus, the interactions of imperfections, residual stress state and material strength are key aspects in fatigue design. In this work, cast steel and aluminium alloys are investigated, each of them in vibratory finished and polished surface condition. A layer-based fatigue assessment concept is extended towards stable effective mean stress state considering the elastic–plastic material behaviour. Murakami’s concept was applied to incorporate the effect of hardness change and residual stress state. Residual stress relaxation is determined by elastic–plastic simulations invoking a combined hardening model. If the effective stress ratio within the local layer-based fatigue strength is evaluated as critical distance value, a sound calculation of fatigue strength can be achieved. Summing up, the layer-based fatigue strength design is extended and features an enhanced understanding of the effective stabilized mean stress state during cyclic loading.

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“…Shot peening is reported to cause grain refinement and nano-crystallization in the surface and subsurface area of austenitic stainless steels [1][2][3][4][5][6], which are expected to have noticeable mechanical, physical and chemical characteristics. Moreover, shot peening has many advantages on material properties, including tribology [7,8], biocompatibility [9], anti-wear [10] and fatigue [11][12][13][14]. Although the increase in surface roughness after shot-peening may deteriorate the fatigue strength, the introduced residual compressive stress is able to increase the fatigue strength/life of 304 and/or 316 stainless steels (SSs) [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effects of Micro-Shot Peening on the Stress Corrosion Cracking of Austenitic Stainless Steel Welds

Kang

Chen

Tsay

2022

Metals

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Micro-shot peening on AISI 304 and 316 stainless steel (SS) laser welds was performed to evaluate its effect on the susceptibility to stress corrosion cracking (SCC) in a salt spray containing 10% NaCl at 80 °C. The cracking susceptibility of the welds was disclosed by testing U-bend specimens in a salt spray. Micro-shot peening caused an intense but narrow deformed layer with a nanocrystal structure and residual compressive stress. Austenite to martensite transformation occurred heavily on the top surface of the micro-shot peened welds. SCC microcracks were more likely to be initiated at the fusion boundary (FB) of the non-peened welds. However, fine pits were formed more easily on the micro-shot peened 304 fusion zone (FZ), which was attributed to the extensive formation of strain-induced martensite. The nanograined structure and induced residual compressive stress in the micro-shot peened layer suppressed microcrack initiation in the 304 and 316 welds in a salt spray. Compared with the other zones in the welds in a salt spray, the high local strain at the FB was the cause of the high cracking susceptibility and could be mitigated by the micro-shot peening treatment.

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Enhanced Fatigue Behavior in Quenched and Tempered High-Strength Steel by Means of Double Surface Treatments

Cited by 5 publications

References 19 publications

Effect of Shot Peening and Nitriding on Toughness and Abrasive Wear Resistance of Powder Metallurgic Steels Highly Alloyed with Vanadium

Effect of Shot Peening and Nitriding on Toughness and Abrasive Wear Resistance of Powder Metallurgic Steels Highly Alloyed with Vanadium

Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys

Effects of Micro-Shot Peening on the Stress Corrosion Cracking of Austenitic Stainless Steel Welds

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