Nitriding duration reduction without sacrificing mechanical characteristics and fatigue behavior: The beneficial effect of surface nano-crystallization by prior severe shot peening

Hassani-Gangaraj, S.M.; Moridi, Atieh; Guagliano, Mario; Ghidini, A.

doi:10.1016/j.matdes.2013.10.015

Cited by 62 publications

(24 citation statements)

References 30 publications

(36 reference statements)

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“…The average grain size was measured to 50 nm and the fatigue life improved with 246%. Hassani-Gangaraj et al [35] used high coverage to create a fine grained structure that more easily diffuse nitrogen, decreasing the cost of gas nitriding.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Nordin

Alfredsson

2017

Exp Tech

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Shot peening is a manufacturing process commonly used to increase fatigue life in components for the automotive and aircraft industry. In this paper the effect of shot peening is described for a case hardened gear steel. For gears there are three main factors from shot peening that influence fatigue life: residual stresses, microstructure and surface roughness. The paper describes an experimental series where these parameters were measured for common industrial shot peening settings. The aim was to show how several different measurement techniques and results correspond to each other for certain shot peening parameters. The aim was also to gather experimental results that can be used for verification of shot peening simulations. To simplify measurements and decrease variation, flat steel plates were used as targets. Residual stress, full width at half maximum (FWHM), retained austenite, surface roughness/topology, hardness and Barkhausen noise were measured and related to microstructural changes. The mean indentation diameter was measured for individual shots at low coverage of each intensity which was used to determine the average velocity of the media. The mean diameter and hardness of the shot peening media was also determined.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Nordin

Alfredsson

2017

Exp Tech

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“…Shot peening (SP) as a typical surface mechanical treatment method extensively used in industry can be applied to acquire a nanostructured surface layer [4][5][6][7]. The investigations on SNC by using SP have attracted an intense research interest during the last decades [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Surface nanocrystallization and gradient structure developed in the bulk TC4 alloy processed by shot peening

Liu

2016

Journal of Alloys and Compounds

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“…The full width of the X-ray diffraction peak at half of its maximum value (FWHM) is able to accurately reflect some features of the surface work hardening, which may not be revealed by micro-hardness values [3,4]. FWHM is related to grain distortion, dislocation density and grain size, and can be assumed as an index of the hardening of the material.…”

Section: Comparison With Experiments and Rolling Feed Effectmentioning

confidence: 99%

“…Large depth of the affected layer, exhibiting sufficient work hardening and compressive residual stresses, as well as generation of glossy surfaces with low roughness is the advantage of deep rolling with respect to other surface treatments [2]. For instance, the typical depth of the compressed layer in shot peening or nitriding is a few hundred micrometers [3,4] while deep rolling is able to extend the compressed layers more than 1 mm deep [5].…”

Section: Introductionmentioning

confidence: 99%

Finite element approach toward an advanced understanding of deep rolling induced residual stresses, and an application to railway axles

2015

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A full-scale railway axle made of medium strength steel EA4T and adopted for high-speed applications, is deep rolled. The induced residual stresses were experimentally characterized by X-ray diffraction and hole drilling. A realistic finite element model is proposed to overcome some of the existing shortcomings in simulation of deep rolling. Deep rolling coverage is defined, formulated and incorporated into the simulation. The model is validated by the experimental measurements. A parametric study is performed to investigate the effect of rolling force (4-19 kN), rolling feed (0.1-0.7 mm/rev) and roll geometry (1.5-10 mm roll tip radius) on the distribution of residual stresses and the induced hardening. A fatigue crack propagation algorithm is used to analyze the influence of technological parameters on the lifetime of railway axles. Lower feeds, higher loads and thicker rolls, all resulting in higher deep coverage, can result in higher improvement against fatigue crack propagation. However, extremely high coverage can deteriorate the performance of deep rolled components. As a general rule of thumb, adopting deep rolling feed to get a coverage level of 500-900%, while avoiding too high rolling loads and too thin rolls, can induce a suitable compressive residual stress distribution; and effectively prevent/retard fatigue crack propagation

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Nitriding duration reduction without sacrificing mechanical characteristics and fatigue behavior: The beneficial effect of surface nano-crystallization by prior severe shot peening

Cited by 62 publications

References 30 publications

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Surface nanocrystallization and gradient structure developed in the bulk TC4 alloy processed by shot peening

Finite element approach toward an advanced understanding of deep rolling induced residual stresses, and an application to railway axles

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