Detail publikace

Influence of Cold, Warm and Plasma Sprayed Layers on High-Cycle Fatigue Properties of Steel Specimens

ČÍŽEK, J. MATĚJKOVÁ, M. KAY, C. KARTHIKEYAN, J. KURODA, S. KOVÁŘÍK, O. SIEGL, J. KHOR, K. DLOUHÝ, I.

Originální název

Influence of Cold, Warm and Plasma Sprayed Layers on High-Cycle Fatigue Properties of Steel Specimens

Anglický název

Influence of Cold, Warm and Plasma Sprayed Layers on High-Cycle Fatigue Properties of Steel Specimens

Jazyk

en

Originální abstrakt

In the presented study, the influence of thermally sprayed coatings on fatigue behavior of coated bodies was studied. Commercial-grade titanium powder was deposited onto steel specimens using four thermal spray technologies: plasma spray, low-pressure and portable cold spray, respectively, and warm spray. The specimens were then subjected to strain controlled cyclic bending test in a dedicated in-house built device. The crack propagation was monitored by observing the changes in the resonance frequency of the samples. A stop-condition corresponding to approximately 40-60% specimen cross-section damage was used to define the fatigue performance of the specimen. The corresponding number of cycles was considered the main performance indicator. It was found that the grit-blasting procedure did not alter the fatigue properties of the steel specimens considerably (5% increase), while deposition of the coatings via all technologies significantly increased the measured fatigue lives. The three high-velocity technologies led to a relative lives of 202% (low-pressure cold spray), 220% (portable cold spray), and 383% (warm spray) and the deposition using plasma spray led to an increase of relative lives to 316%. The increase could probably be attributed to a combination of the presence of a homogeneous fatigue resistant coating and induction of peening stresses into the substrates via the impingement of the high-kinetic energy particles (cold sprays and warm spray). Given the intrinsic character of the plasma jet (low-velocity impact of semi/molten particles), the influence needs to be attributed to a different mechanism.

Anglický abstrakt

In the presented study, the influence of thermally sprayed coatings on fatigue behavior of coated bodies was studied. Commercial-grade titanium powder was deposited onto steel specimens using four thermal spray technologies: plasma spray, low-pressure and portable cold spray, respectively, and warm spray. The specimens were then subjected to strain controlled cyclic bending test in a dedicated in-house built device. The crack propagation was monitored by observing the changes in the resonance frequency of the samples. A stop-condition corresponding to approximately 40-60% specimen cross-section damage was used to define the fatigue performance of the specimen. The corresponding number of cycles was considered the main performance indicator. It was found that the grit-blasting procedure did not alter the fatigue properties of the steel specimens considerably (5% increase), while deposition of the coatings via all technologies significantly increased the measured fatigue lives. The three high-velocity technologies led to a relative lives of 202% (low-pressure cold spray), 220% (portable cold spray), and 383% (warm spray) and the deposition using plasma spray led to an increase of relative lives to 316%. The increase could probably be attributed to a combination of the presence of a homogeneous fatigue resistant coating and induction of peening stresses into the substrates via the impingement of the high-kinetic energy particles (cold sprays and warm spray). Given the intrinsic character of the plasma jet (low-velocity impact of semi/molten particles), the influence needs to be attributed to a different mechanism.

Dokumenty

BibTex


@inproceedings{BUT108046,
  author="Jan {Čížek} and Michaela {Matějková} and Charles {Kay} and Jeganathan {Karthikeyan} and Seiji {Kuroda} and Ondřej {Kovářík} and Jan {Siegl} and Khiam Aik {Khor} and Ivo {Dlouhý}",
  title="Influence of Cold, Warm and Plasma Sprayed Layers on High-Cycle Fatigue Properties of Steel Specimens",
  annote="In the presented study, the influence of thermally sprayed coatings on fatigue behavior of coated bodies was studied.

Commercial-grade titanium powder was deposited onto steel specimens using four thermal spray technologies: plasma spray, low-pressure and portable cold spray, respectively, and warm spray. The specimens were then subjected to strain controlled cyclic bending test in a dedicated in-house built device. The crack propagation was monitored by observing the changes in the resonance frequency of the samples. A stop-condition corresponding to approximately 40-60% specimen cross-section damage was used to define the fatigue performance of the specimen. The corresponding number of cycles was considered the main performance indicator.

It was found that the grit-blasting procedure did not alter the fatigue properties of the steel specimens considerably (5% increase), while deposition of the coatings via all technologies significantly increased the measured fatigue lives. The three high-velocity technologies led to a relative lives of 202% (low-pressure cold spray), 220% (portable cold spray), and 383% (warm spray) and the deposition using plasma spray led to an increase of relative lives to 316%.

The increase could probably be attributed to a combination of the presence of a homogeneous fatigue resistant coating and induction of peening stresses into the substrates via the impingement of the high-kinetic energy particles (cold sprays and warm spray). Given the intrinsic character of the plasma jet (low-velocity impact of semi/molten particles), the influence needs to be attributed to a different mechanism.",
  address="DVS Media GmbH",
  booktitle="International Thermal Spray Conference 2014 Proceedings",
  chapter="108046",
  howpublished="online",
  institution="DVS Media GmbH",
  year="2014",
  month="may",
  pages="577--581",
  publisher="DVS Media GmbH",
  type="conference paper"
}