Retardation of crack initiation and growth in austenitic stainless steels by laser peening without protective coating

Sano, Yuji; Obata, Masaaki; Kubo, Takeji; Mukai, Naruhiko; Yoshida, Masaki; Kobayashi, Masaki; Ochi, Yasuo

doi:10.1016/j.msea.2005.11.017

Cited by 325 publications

(155 citation statements)

References 17 publications

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“…Similar RS results were obtained in our previous publications [11,18,29] and are consistent results after LSP in other publication [7,14,42].…”

Section: Micro-hardness and Residual Stressessupporting

confidence: 93%

“…As a result, high compressive residual stresses are generated and confined to a shallow surface layer whilst balancing low-tensile residual stresses are spread deeper throughout the cross-section of the material [12], Enhancement of fatigue, corrosion, stress corrosion and wear resistance has already been proved for various types of materials, such as aluminium and titanium alloys and different types of steel [11][12][13][14][15][16][17][18]. In our recent publication [18], we investigated the effect of LSPwC treatment on corrosion behaviour on an AA6082 aluminium alloy in a 0.6 M NaCI solution.…”

Section: Introductionmentioning

confidence: 99%

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Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of \ = 1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus® microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 um) in the transverse direction (Omin) of laser-beam movement, i.e. -407 ±81 MPa and -346 ± 124 MPa, after 900 and 2500 pulses/cm 2 , respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 um below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both I and T directions.

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“…Similar RS results were obtained in our previous publications [11,18,29] and are consistent results after LSP in other publication [7,14,42].…”

Section: Micro-hardness and Residual Stressessupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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“…The shock waves are produced from the confined, rapid expansion of a plasma generated by the irradiation of the surface (with or without a sacrificial coating) by a high power laser pulse [3,10,11]. The effectiveness of LSP for steels has been demonstrated through preventive maintenance against stress-corrosion cracking in operating nuclear power reactors since 1999 [12]. In WJCP, ultra-high pressure water jets are used to create a cloud of intense cavitation bubbles.…”

mentioning

confidence: 99%

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

et al. 2010

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Four mechanical surface treatments have been considered for the application to austenitic stainless steel structures. Shot peening (SP), laser shock peening (LSP), ultrasonic impact treatment (UIT) and water jet cavitation peening (WJCP), also known as cavitation shotless peening (CSP), have been applied to 8 mm thick Type 304 austenitic stainless steel coupons. This study considers the merits of each of these mechanical surface treatments in terms of their effect on the surface roughness, microstructure, level of plastic work and through thickness residual stress distribution. Microstructural studies have revealed the formation of martensite close to the treated surface for each process. Residual stress measurements in the samples show compressive stresses to a significantly greater depth for the LSP, UIT and WJCP samples compared to the more conventional SP treated sample.

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“…The fatigue limit for completely reversed loading was 381 MPa, 9) and ultimate tensile stress was 560 MPa. 10) The fatigue safety factor (FSF) was calculated. 11) There is the highest probability of fracture at the place with the smallest FSF.…”

Section: Fatigue Analysismentioning

confidence: 99%

Finite Element Analysis of Tensile Fatigue Behavior of Coronary Stent

Pang

Enoki

Sakurai³

2012

Mater. Trans.

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Coronary stent has been popular method for the treat of coronary artery stenosis while stent fracture has been observed sometimes after implantation. Tensile fatigue behavior of stent plays an important role and the effective analysis method of stent properties is needed. In addition, from the data of patients we know that the stent always appears to have an elliptical shape in the vessels and it may affect the performance of stent. In this study, the tensile fatigue performance of one stent was analyzed by the finite element simulation method. An effective simulation process was performed to analyze the tensile fatigue behavior under different maximum strain and the effect of diameter of stent was considered. An equivalent stress (SEQA) was applied in evaluation and the results showed different results by comparing with Mises stress. A Goodman fatigue analysis was performed using the equivalent stress and fracture was predicted. Also, the effect of elliptical shape was analyzed and it showed no significant difference of SEQA between the circle and elliptical model on tensile fatigue performance.

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Retardation of crack initiation and growth in austenitic stainless steels by laser peening without protective coating

Cited by 325 publications

References 17 publications

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Engineering the residual stress state and microstructure of stainless steel with mechanical surface treatments

Finite Element Analysis of Tensile Fatigue Behavior of Coronary Stent

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