Peening Action and Residual Stresses in High-Velocity Oxygen Fuel Thermal Spraying of 316L Stainless Steel

Katayama, Seiji; Tashiro, Yasuhiko; Yumoto, Hisami; Taira, Susumu; Fukanuma, Hirotaka; Tobe, Shogo

doi:10.1361/105996301770349457

Cited by 92 publications

(34 citation statements)

References 3 publications

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“…9,22 In Fig. 6, this peening intensity is captured through the correlation between measured evolving stress and average particle kinetic energy for gas and liquid fuel HVOF torches.…”

Section: Particle Kinetic Energy and Peening Intensitymentioning

confidence: 99%

Structurally Integrated, Damage-Tolerant, Thermal Spray Coatings

Vackel

Dwivedi

Sampath

2015

JOM

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Thermal spray coatings are used extensively for the protection and life extension of engineering components exposed to harsh wear and/or corrosion during service in aerospace, energy, and heavy machinery sectors. Cermet coatings applied via high-velocity thermal spray are used in aggressive wear situations almost always coupled with corrosive environments. In several instances (e.g., landing gear), coatings are considered as part of the structure requiring system-level considerations. Despite their widespread use, the technology has lacked generalized scientific principles for robust coating design, manufacturing, and performance analysis. Advances in process and in situ diagnostics have provided significant insights into the process-structure-property-performance correlations providing a framework-enhanced design. In this overview, critical aspects of materials, process, parametrics, and performance are discussed through exemplary studies on relevant compositions. The underlying connective theme is understanding and controlling residual stresses generation, which not only addresses process dynamics but also provides linkage for process-property relationship for both the system (e.g., fatigue) and the surface (wear and corrosion). The anisotropic microstructure also invokes the need for damage-tolerant material design to meet future goals.

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“…9,22 In Fig. 6, this peening intensity is captured through the correlation between measured evolving stress and average particle kinetic energy for gas and liquid fuel HVOF torches.…”

Section: Particle Kinetic Energy and Peening Intensitymentioning

confidence: 99%

Structurally Integrated, Damage-Tolerant, Thermal Spray Coatings

Vackel

Dwivedi

Sampath

2015

JOM

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“…(1 [1], or 300 Á/800 m s (1 for stainless steel powders [2]. The APS process mainly transfers thermal energy to the particles, whereas in HVOF the dominant energy transferred is kinetic.…”

Section: Introductionmentioning

confidence: 99%

“…The particles spread upon impact, but the contraction during cooling and solidification is constrained by the underlying material and tensile stresses are generated inside each sprayed particle. On the other hand, peening stresses are generated in top layers where partially fused particles impact at high velocity, as in HVOF spraying [2,10]. The surface of the target is plastically deformed, inducing a significant level of compressive stresses that add on the previous quenching stresses.…”

Section: Introductionmentioning

confidence: 99%

“…The surface of the target is plastically deformed, inducing a significant level of compressive stresses that add on the previous quenching stresses. Obviously, the surface layer of the coating remains under the effect of the quenching stresses, and the depth of the peening effect was observed to be as deep as 50 mm in 316L stainless steel coatings [2].…”

Section: Introductionmentioning

confidence: 99%

“…For such coatings, the residual stress state at the top surface can change from tensile to compressive as the temperature increases, due to different proportions of the quenching and thermal mismatch components [25]. In HVOF sprayed coatings the peening stresses can reach important values, and the residual stress state can be controlled by the spray parameters [2].…”

Section: Introductionmentioning

confidence: 99%

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Study by X-ray diffraction and mechanical analysis of the residual stress generation during thermal spraying

Pina

Dias

Lebrun

2003

Materials Science and Engineering: A

105

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Thermally sprayed coatings are formed by the deposition of molten or partially molten particles, propelled onto a substrate where they impact, spread and solidify rapidly. Residual stresses are expected within the sprayed deposit as a consequence of the release of thermal and kinetic energies. A wide range of materials and two spraying techniques are considered in this study, namely atmospheric plasma spraying (APS) and high-velocity oxygen fuel. Stresses were determined by the X-ray diffraction (XRD) method. The results were compared with those calculated by mechanical analysis of stress relief in coatings detached from the substrate. Comparison of the results for adherent and free-standing coatings shows that the residual stress state can be resolved in terms of the components suggested by models that propose two stages of stress generation: quenching stresses and secondarycooling stresses. The in-depth distribution of residual stresses, through the coating thickness, is discussed in terms of the nature of the coating system. #

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