Optimization of HVOF Cr3C2 -NiCr coating for increased fatigue performance

T. Varis (Corresponding Author), T. Suhonen, O. Calonius, J. Cuban, M. Pietola

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Thermally sprayed coatings are strong candidates to be used for replacement of hard chromium - process which is regarded as an environmental risk - in many sliding surfaces for engineering applications such as hydraulic cylinders and aircraft landing gears. Recent advance in thermal spraying technology, based on the increase of the spray particle velocity, has led to improved coating quality. This study focuses on the fatigue performance of structural steel coated with Cr3C2single bondNiCr coating. Coating has been produced by using high kinetic HVOF thermal spray process. First, the coating was optimized for fatigue purposes by studying the residual stress generation. The optimized coating was selected for deposition of axial fatigue tests specimens, whose fatigue performance was compared to the uncoated steel specimens having different surface treatments (turning, polishing, and shot blasting) relevant for the target applications. The results showed that by using a high kinetic energy coating, the fatigue performance of Cr3C2single bondNiCr coated structural steel was clearly improved compared to uncoated steel of similar surface quality. Increased fatigue resistance of the coated material was attributed to the substantial compressive residual stresses that hindered crack initiation and that was caused by the high velocity spray particles during the coating process.
Original languageEnglish
Pages (from-to)123-131
JournalSurface and Coatings Technology
Volume305
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Fatigue of materials
coatings
Steel
Coatings
optimization
steels
sprayers
residual stress
aircraft landing
landing gear
Residual stresses
Landing gear (aircraft)
sprayed coatings
fatigue tests
Coated materials
landing
Thermal spraying
crack initiation
spraying
surface treatment

Keywords

  • fatigue performance
  • wear resistance
  • HVOF thermal spray
  • residual stress
  • S-N curve
  • Cr3C2single bondNiCr coating
  • ProperTune

Cite this

Varis, T. ; Suhonen, T. ; Calonius, O. ; Cuban, J. ; Pietola, M. / Optimization of HVOF Cr3C2 -NiCr coating for increased fatigue performance. In: Surface and Coatings Technology. 2016 ; Vol. 305. pp. 123-131.
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title = "Optimization of HVOF Cr3C2 -NiCr coating for increased fatigue performance",
abstract = "Thermally sprayed coatings are strong candidates to be used for replacement of hard chromium - process which is regarded as an environmental risk - in many sliding surfaces for engineering applications such as hydraulic cylinders and aircraft landing gears. Recent advance in thermal spraying technology, based on the increase of the spray particle velocity, has led to improved coating quality. This study focuses on the fatigue performance of structural steel coated with Cr3C2single bondNiCr coating. Coating has been produced by using high kinetic HVOF thermal spray process. First, the coating was optimized for fatigue purposes by studying the residual stress generation. The optimized coating was selected for deposition of axial fatigue tests specimens, whose fatigue performance was compared to the uncoated steel specimens having different surface treatments (turning, polishing, and shot blasting) relevant for the target applications. The results showed that by using a high kinetic energy coating, the fatigue performance of Cr3C2single bondNiCr coated structural steel was clearly improved compared to uncoated steel of similar surface quality. Increased fatigue resistance of the coated material was attributed to the substantial compressive residual stresses that hindered crack initiation and that was caused by the high velocity spray particles during the coating process.",
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Optimization of HVOF Cr3C2 -NiCr coating for increased fatigue performance. / Varis, T. (Corresponding Author); Suhonen, T.; Calonius, O.; Cuban, J.; Pietola, M.

In: Surface and Coatings Technology, Vol. 305, 2016, p. 123-131.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Optimization of HVOF Cr3C2 -NiCr coating for increased fatigue performance

AU - Varis, T.

AU - Suhonen, T.

AU - Calonius, O.

AU - Cuban, J.

AU - Pietola, M.

PY - 2016

Y1 - 2016

N2 - Thermally sprayed coatings are strong candidates to be used for replacement of hard chromium - process which is regarded as an environmental risk - in many sliding surfaces for engineering applications such as hydraulic cylinders and aircraft landing gears. Recent advance in thermal spraying technology, based on the increase of the spray particle velocity, has led to improved coating quality. This study focuses on the fatigue performance of structural steel coated with Cr3C2single bondNiCr coating. Coating has been produced by using high kinetic HVOF thermal spray process. First, the coating was optimized for fatigue purposes by studying the residual stress generation. The optimized coating was selected for deposition of axial fatigue tests specimens, whose fatigue performance was compared to the uncoated steel specimens having different surface treatments (turning, polishing, and shot blasting) relevant for the target applications. The results showed that by using a high kinetic energy coating, the fatigue performance of Cr3C2single bondNiCr coated structural steel was clearly improved compared to uncoated steel of similar surface quality. Increased fatigue resistance of the coated material was attributed to the substantial compressive residual stresses that hindered crack initiation and that was caused by the high velocity spray particles during the coating process.

AB - Thermally sprayed coatings are strong candidates to be used for replacement of hard chromium - process which is regarded as an environmental risk - in many sliding surfaces for engineering applications such as hydraulic cylinders and aircraft landing gears. Recent advance in thermal spraying technology, based on the increase of the spray particle velocity, has led to improved coating quality. This study focuses on the fatigue performance of structural steel coated with Cr3C2single bondNiCr coating. Coating has been produced by using high kinetic HVOF thermal spray process. First, the coating was optimized for fatigue purposes by studying the residual stress generation. The optimized coating was selected for deposition of axial fatigue tests specimens, whose fatigue performance was compared to the uncoated steel specimens having different surface treatments (turning, polishing, and shot blasting) relevant for the target applications. The results showed that by using a high kinetic energy coating, the fatigue performance of Cr3C2single bondNiCr coated structural steel was clearly improved compared to uncoated steel of similar surface quality. Increased fatigue resistance of the coated material was attributed to the substantial compressive residual stresses that hindered crack initiation and that was caused by the high velocity spray particles during the coating process.

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KW - residual stress

KW - S-N curve

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KW - ProperTune

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