Mechanical Properties of coated systems

Grünling, H.W.; Schneider, Klaus; Singheiser, L.

doi:10.1016/0025-5416(87)90083-8

Cited by 61 publications

(14 citation statements)

References 12 publications

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“…As aluminum content, surface roughness, and thickness of the coating decrease, the DBTT drops and thus the negative effects of the coating on mechanical properties of the alloy diminish. [10][11][12][13][14][15][16] Rene´80 is a Ni-base superalloy containing Ti and Al acting as the c¢ precipitation hardening elements and Co, Cr, and Mo added for solution strengthening of substrate. In the c-phase substrate, there is a high volume of primary and secondary precipitated c¢ phase, which increases the strength of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Uncoated and Aluminide-Coated René 80

Rahmani¹,

Nategh

2009

Metall Mater Trans A

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Nickel-base superalloys such as Rene´80 are widely used in manufacturing aircraft turbine blades. They are usually coated in order to increase their wear, oxidation, erosion, and hot corrosion properties against environmental degradation. In this article, the mechanical behavior (tensile and low-cycle fatigue (LCF)) of uncoated and aluminide-coated (CODEP-B) Rene8 0 has been studied at 871°C and 982°C. Experimental results show that the tensile properties of coated specimens are relatively lower than those of uncoated ones in the same conditions, but application of coating increases the LCF life of Rene´80 at T = 871°C, 982°C, R = (e min /e max ) = 0, strain rate of 2 9 10 À3 s À1 , and De t = 0.8 pct. Scanning electron microscopy (SEM) studies of coated specimens at N = Nf show that the nucleation of cracks occurs merely in substrate, but cracks start from the surfaces in uncoated specimens. Transmission electron microscopy (TEM) investigations have been performed on fractured uncoated specimens to evaluate the microstructures at different temperatures. The misfit dislocation, pair dislocations, and cutting of c¢ were observed at T = 871°C and 982°C. The TEM studies also showed that at 982°C stacking fault was observed in c¢ particles.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Uncoated and Aluminide-Coated René 80

Rahmani¹,

Nategh

2009

Metall Mater Trans A

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“…10,20,21 However, in the case of high cycle fatigue (HCF), several authors have reported a decrease in HCF lives because of crack initiation in the coating or at the coating/substrate interface. 22,23 In this study, the coatings and interdiffusion zones did not act as crack initiation sites, but the SIDZ did. If the coating was deposited at a temperature close to $1100°C, the 1 h solution treatment at 1100°C would not be necessary, and SIDZ formation may be minimized.…”

Section: Discussionmentioning

confidence: 67%

Oxidation, Creep and Fatigue Properties of Bare and Coated 31V Alloy

Dryepondt

Jones

Zhang

et al. 2014

JOM

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Increasing the efficiency of natural gas reciprocating engines will require materials with better mechanical and corrosion resistance at high temperatures. One solution to increase the lifetime of exhaust valves is to apply an aluminide coating to prevent corrosion assisted fatigue cracking, but the impact of the coating on the valve material mechanical properties needs to be assessed. In addition to cyclic oxidation testing in dry and humid air at 800°C, creep and high cycle fatigue (HCF) testing were conducted at 816°C on bare and slurry or pack-coated 31V alloy. The coated and bare creep specimens exhibited very similar creep rupture lives, as long as the specimens were annealed according to the 31V standard heat treatment before testing. The HCF behavior of the pack-coated alloy was close to the behavior of the bare alloy, but fatigue lifetimes of slurry-coated 31V specimens had higher variability. Aluminide coatings have the potential to improve the valve performance at high temperature, but the coating deposition process needs to be tailored for the substrate standard heat treatment.

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“…Figure 1, for example, illustrates two contrasting coatings compared to stress strain curve of a substrate. Coating I has higher strength but lower ductility than the substrate, in comparison to coating HI which is weaker but more ductile [8]. If such coating/substrate composite is stressed under equistrain condition, the stronger but less ductile coating breaks giving rise to cracks in the coating.…”

Section: Mechanical and Microstructural Considerationsmentioning

confidence: 99%

“…The next incoming particle falls on the previous one thus forming a layer structure. In the inter-layers, the inter-particle boundaries called splat boundaries are formed, which are significantly weak [7][8][9][10][11][12]. Major concern is that these weak boundaries are parallel to the surface hence parallel to shearing forces that arise during Rolling Contact Fatigue.…”

Section: Application To Thermal Spray Coatingsmentioning

confidence: 99%

Review of Fatigue of Coatings/Substrates

Sadananda

Holtz

2000

Nanostructured Films and Coatings

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A review of fatigue of coatings/substrates is presented. Fatigue damage is either local or general, depending on the range of cyclic loads. Local fatigue damage includes rolling contact fatigue (RCF), fretting fatigue, fatigue-wear and general wear. Applied loads are localized consisting of rolling contacts or sliding contacts, and the resulting damage is mostly surface related. Crack initiation, surface pitting, delamination, spalling, buckling and enhanced wear can result from local fatigue damage of coatings. General fatigue damage results when the loads are of longer range such as cyclic bending, torsion or uniaxial or biaxial tension/compression etc. The mechanics of fatigue, role of microstructure, micromechanics in terms of crack nucleation, growth and fracture are reviewed. Defects produced during processing form precursors for crack nucleation. It is shown that optimization of the processing conditions to minimize defect density is essential to enhance fatigue resistance of coatings/substrates.

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Mechanical Properties of coated systems

Cited by 61 publications

References 12 publications

Mechanical Properties of Uncoated and Aluminide-Coated René 80

Mechanical Properties of Uncoated and Aluminide-Coated René 80

Oxidation, Creep and Fatigue Properties of Bare and Coated 31V Alloy

Review of Fatigue of Coatings/Substrates

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