Internal Crack Initiation and Propagation Behaviors in High Cycle Fatigue of HSP-treated SUS 316 L Steel.

保雄, 越智; 有佐, 明石; 清孝, 政木; 隆, 松村

doi:10.1299/kikaia.66.320

Cited by 3 publications

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“…Figure 8 shows an example of the cross-sectional observation for bending behavior of cracks which initiated at the surface and propagated. Similar behaviors on the crack initiation and propagation during fatigue were observed for SUS316L after the hard shot peening treatment (11) . …”

Section: Effects Of Lpwc Treatment On Fatigue Property Of Smooth Specsupporting

confidence: 72%

Effects of Laser Peening Treatment on High Cycle Fatigue and Crack Propagation Behaviors in Austenitic Stainless Steel

Kobayashi

Ochi

Matsumura

et al. 2010

JPES

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Laser peening without protective coating (LPwC) treatment is one of surface enhancement techniques using an impact wave of high pressure plasma induced by laser pulse irradiation. High compressive residual stress was induced by the LPwC treatment on the surface of low-carbon type austenitic stainless steel SUS316L. The affected depth reached about 1mm from the surface. High cycle fatigue tests with four-points rotating bending loading were carried out to confirm the effects of the LPwC treatment on fatigue strength and surface fatigue crack propagation behaviors. The fatigue strength was remarkably improved by the LPwC treatment over the whole regime of fatigue life up to 10 8 cycles. Specimens with a pre-crack from a small artificial hole due to fatigue loading were used for the quantitative study on the effect of the LPwC treatment. The fracture mechanics investigation on the pre-cracked specimens showed that the LPwC treatment restrained the further propagation of the pre-crack if the stress intensity factor range ∆K on the crack tip was less than 7.6 MPa√m. Surface cracks preferentially propagated into the depth direction as predicted through ∆K analysis on the crack by taking account of the compressive residual stresses due to the LPwC treatment.

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Section: Effects Of Lpwc Treatment On Fatigue Property Of Smooth Specsupporting

confidence: 72%

Effects of Laser Peening Treatment on High Cycle Fatigue and Crack Propagation Behaviors in Austenitic Stainless Steel

Kobayashi

Ochi

Matsumura

et al. 2010

JPES

Self Cite

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“…6) and the final fracture area (area 4 in Fig. 6), based on the results of fractographic investigation using SEM in a series of studies 8,10 …”

Section: Resultsmentioning

confidence: 99%

“…The authors have determined the rotating bending high cycle fatigue properties of hard‐shot‐peened Type 316L austenitic stainless steel (HSP‐treated Type 316L) in a series of studies 4–12 . Although the fatigue crack propagation behaviour was investigated through SEM fracture surface observations, there are still many points that must be clarified concerning its fatigue fracture mechanism.…”

Section: Introductionmentioning

confidence: 99%

Initiation and propagation behaviour of fatigue cracks in hard‐shot peened Type 316L steel in high cycle fatigue

Kobayashi

Ochi

Matsumura

2004

Fatigue Fract Eng Mat Struct

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A B S T R A C T Observations of fatigue crack growth behaviour were made during rotating-bend testing of hard-shot peened Type 316L steel. From the results of these observations, the crack that developed in the axial direction was observed and the mechanism of the fatigue crack properties was clarified as follows: (1) Small circumferential surface fatigue cracks were detected at 60% of the fatigue lifetime. These cracks propagated very slowly in both the circumferential and radial directions.(2) When a radial crack reached a depth of between 150 and 350 µm, axial fatigue cracks were formed.(3) In the next stage, either the radial or the axial fatigue cracks continued propagating, or an inwards growing radial crack formed from the axial crack. (4) In the final stage, the circumferential surface crack began to grow rapidly and resulted in fracture. (5) The fracture type of hard-shot peened Type 316L is a particular type of surface fracture.Keywords fatigue crack behaviour; fracture surface; hard-shot peening; high cycle fatigue; Type 316L stainless steel. N O M E N C L A T U R E d= distance of axial crack from surfaceHv = Vickers hardness Hv 0 = Vickers hardness of material N = number of cycles N f = number of cycles to failure σ a = stress amplitude σ r = residual stress I N T R O D U C T I O NSurface-hardening treatment is useful for improving high cycle fatigue strength, and fatigue properties of many surface-hardened materials have been investigated in detail for a long time. According to recent research papers, it has become clear that a surface-hardened material exhibits two types of fatigue fracture: a surface fracture and an internal fracture. 1 In the case of surface fracture, the fatigue crack initiates at an inclusion or slip plane of the surface. Moreover, the fatigue crack initiation and propagation behaviours can be investigated easily because it is possible to observe the fatigue crack directly using an optical microscope or a scanning electron microscope (SEM). If these direct observation methods are impossible, indirect observation methods, such as the replication method,are useful for fatigue crack investigation. In the case of internal fracture, the fatigue crack initiates at a subsurface defect, such as an inclusion or pore. 2 For internal fractures, it is difficult to investigate the fatigue crack propagation behaviour because the fatigue crack cannot be directly observed with a microscope during fatigue tests. In this case, the fatigue crack propagation behaviour can be inferred to some degree by fracture surface observation using the SEM. 3 However, it is difficult to know the exact internal crack behaviour, so it is necessary to have additional information that supports the inference. The authors have determined the rotating bending high cycle fatigue properties of hard-shot-peened Type 316L austenitic stainless steel (HSP-treated Type 316L) in a series of studies. 4-12 Although the fatigue crack propagation behaviour was investigated through SEM fracture surface observations, there are stil...

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Shot Peening

Harada

2016

Journal of The Surface Finishing Society of Japan

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Internal Crack Initiation and Propagation Behaviors in High Cycle Fatigue of HSP-treated SUS 316 L Steel.

Cited by 3 publications

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Effects of Laser Peening Treatment on High Cycle Fatigue and Crack Propagation Behaviors in Austenitic Stainless Steel

Effects of Laser Peening Treatment on High Cycle Fatigue and Crack Propagation Behaviors in Austenitic Stainless Steel

Initiation and propagation behaviour of fatigue cracks in hard‐shot peened Type 316L steel in high cycle fatigue

Shot Peening

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