Fatigue Properties of Hard Shot-Peened Sus316l

Kobayashi, Masaki; Ochi, Yasuo; Ishii, Akira

doi:10.2472/jsms.47.9appendix_200

Cited by 5 publications

(6 citation statements)

References 10 publications

(9 reference statements)

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“…Type 316L. The reasons for the improvement of the fatigue property were assumed to be the presence of the surface‐hardening layer and the mean stress effect of compressive residual stresses 4,5,7,9,13 Figure 4. shows the change of material property near the surface accompanying a cyclic stress amplitude of 420 MPa.…”

Section: Resultsmentioning

confidence: 99%

“…The reasons for the improvement of the fatigue property were assumed to be the presence of the surface-hardening layer and the mean stress effect of compressive residual stresses. 4,5,7,9,13 Figure 4a shows the Vickers hardness ratio, Hv/Hv 0 , distributions. Here, a value of Hv 0 is the mean hardness value of non-peened specimen.…”

Section: Fatigue Testmentioning

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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Fatigue Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…워터캐비테이션 피닝은 재료 표면에 마 이크로 제트 생성으로 압축잔류응력을 형성시켜 경도를 향 상시키고 캐비테이션-침식 손상을 감소시키는 표면가공 기술이다 14) . 이와 유사한 방법으로 쇼트피닝과 레이저 피닝 방법이 있으며, 특히 Peyre, Masaki 등은 316L 스테인리 스강에 대해 각각 쇼트피닝과 레이저 피닝을 적용하여 재료 의 피로강도를 향상시키는 연구를 하였다 15,16) . 영향을 받지 않는 장점이 있다.…”

Section: 서 론unclassified

Effect of cavitation on surface damage of 16.7Cr-10Ni-2Mo stainless steel in marine environment

Chong¹,

Han²,

Kim

2015

Corrosion Science and Technology

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Stainless steel is generally known to have characteristics of excellent corrosion resistance and durability, but in a marine environment it can suffer from localized corrosion due to the breakdown of passivity film due to chloride ion in seawater. Furthermore, the damage behaviors are sped up under a cavitation environment because of complex damage from electrochemical corrosion and cavitation-erosion. In this study the characteristics of electrochemical corrosion and cavitation erosion behavior were evaluated on 16.7Cr-10Ni-2Mo stainless steel under a cavitation environment in natural seawater. The electrochemical experiments have been conducted at both static conditions and dynamic conditions inducing cavitation with different current density parameters. The surface morphology and damage behaviors were compared after the experiment. After the cavitation test with time variables morphological examinations on damaged specimens were analyzed by using a scanning electron microscope and a 3D microscope. the galvanostatic experiment gave a cleaner surface morphology presented with less damage depth at high current density regions. It is due to the effect of water cavitation peening under the cavitation condition. In the cavitation experiment, with amplitude of 30 ㎛ and seawater temperature of 25 ℃, weight loss and cavitation-erosion damage depth were dramatically increased after 5 hours inducing cavitation

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“…Shot peening (SP), which utilises the impact generated by shot, can be applied to enhance the fatigue strength of mechanical components by introducing compressive residual stress on the surface layer. [1][2][3][4][5][6] In order to carry out this treatment while the plant is in its operating condition, there must be no risk from sparks and dust explosions generated by shot colliding. In the present paper, we describe an SP technique in which the recirculating shots are accelerated by a water jet.…”

Section: Introductionmentioning

confidence: 99%

Development of peening technique using recirculating shot accelerated by water jet

Naito

Takakuwa

Soyama

2012

Materials Science and Technology

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The present paper demonstrates the development of a peening technique using recirculating shot accelerated by a water jet that can be used as a risk free treatment in power and chemical plants.Although it is important to increase the reliability of structural materials used in large scale structures, such as power and chemical plants, it is hazardous to treat these structures by general shot peening (SP) techniques because of the risk of sparks and dust explosions. In the present study, an SP technique using a water jet to accelerate shot has been developed, and the conditions under which it is used have been optimised in terms of nozzle geometry, standoff distance and amount of shot. In order to demonstrate the effect of SP, austenitic stainless steel Japan Industries Standards SUS316L was peened and evaluated in terms of its residual stress, fatigue strength and resistance to stress corrosion cracking. IntroductionIn large scale structures, such as power and chemical plants, it is necessary to ensure its long time operation by enhancing the fatigue strength and suppressing the stress corrosion cracking (SCC) in the materials from which the structure is made. Shot peening (SP), which utilises the impact generated by shot, can be applied to enhance the fatigue strength of mechanical components by introducing compressive residual stress on the surface layer. 1-6 In order to carry out this treatment while the plant is in its operating condition, there must be no risk from sparks and dust explosions generated by shot colliding. In the present paper, we describe an SP technique in which the recirculating shots are accelerated by a water jet.It is well known that the residual stress on the surface layer introduced by mechanical processing or heat treatment is one of the major factors that affects the fatigue strength and the resistance to SCC. 7-13 The SCC usually occurs when we have a material under tensile stress, including residual stress, in a corrosive environment. As it is difficult to improve a material's resistance to corrosion and reduce its exposure to the environment during operation, its resistance to tensile stress should be improved. This can be performed by introducing compressive residual stress on the surface for example using peening techniques, such as SP, cavitation peening 14-17 or laser peening. [18][19][20] In general, air blast systems and centrifugal blast systems are used for accelerating shot. The shots hit the surface in high velocity and broke due to colliding. 21,22 There is a possibility that sparks and dust explosions generate in such situation. 23,24 For this reason, general SP treatment is always exposed to risk of sparks and dust explosions. In order to avoid the risk of sparks and dust explosions caused by solid body collisions, it is essential to use a dust collector and a separator. As those systems make the SP apparatus larger, it becomes more difficult to treat some structures. Therefore, an alternative technique for accelerating shot to replace air blast systems or centrifugal ...

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Fatigue Properties of Hard Shot-Peened Sus316l

Cited by 5 publications

References 10 publications

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

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

Effect of cavitation on surface damage of 16.7Cr-10Ni-2Mo stainless steel in marine environment

Development of peening technique using recirculating shot accelerated by water jet

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