High temperature oxidation behavior of laser cladding MCrAlY coatings on austenitic stainless steel

Pereira, Juan Carlos; Zambrano, Jenny; Tobar, M.J.; Yáñez, A.; Amigó, V.

doi:10.1016/j.surfcoat.2015.02.050

Cited by 63 publications

(26 citation statements)

References 28 publications

(46 reference statements)

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“…It has been widely reported that the  k value of the Al 2 O 3 TGO layer is directly proportional to the inward diffusion rate of oxygen during the isothermal oxidation [60,61,[67][68][69][70]. Thus, the oxygen diffusion in the Al 2 O 3 TGO layer was brought to the forefront of this research.…”

Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 89%

“…For the bi-layered TGO found on the bond coat surface of the samples that underwent long isothermal oxidation times, the oxygen diffusion to the inside went through the mixed oxides and the α-Al 2 O 3 scale. It has been reported that the oxygen diffusion coefficient in mixed oxides is much higher than that in α-Al 2 O 3 by several orders of magnitude [56,57], and the mixed oxides layer can be neglected when considering the growth of TGO via oxygen diffusion [37,56,57,69]. Hence, in this study, the mixed oxides were excluded when calculating the TGO layer thickness to better understand the growth behaviour of the Al 2 O 3 scale.…”

Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 99%

“…Thus, the oxygen diffusion in the Al 2 O 3 TGO layer was brought to the forefront of this research. For the oxygen diffusion in the oxide scale that covered the bond coat surface, the grain boundaries and the bulk crystalline grains are the main diffusion routes [37,60,61,65,[67][68][69][70][71][72][73]. Since the grain boundary is the interface between two grains with different crystalline orientations, the grain boundary is actually a layer of irregularly arranged atoms [74,75].…”

Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 99%

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Non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat

Zhang

Yang

2017

Applied Surface Science

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The non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat was investigated. To qualitatively explain the abnormal growth phenomenon of thermally grown oxides (TGO), the changes that occurred to their microstructure during the oxidation process were studied.Based on these observations, a modified model was developed to understand and quantitatively predict the non-parabolic oxidation and growth kinetics of TGO. This modified model, which fits well with experimental results, provides a novel method to quantitatively predict the long-term growth behaviour of TGO, and thereby benefits the development of long-life and highly reliable thermal barrier coatings.

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Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 89%

Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 99%

Section: Tgo Growth Kinetics During Isothermal Oxidationmentioning

confidence: 99%

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Non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat

Zhang

Yang

2017

Applied Surface Science

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“…Consequently, tetragonal to monoclinic phase transformation was not inhibited during cooling in regions with low or no Y 2 O 3 content. However, the fusion process that occurs during laser re-melting contributes to the redistribution of yttrium particles and allows a homogeneous distribution of yttrium oxides unlike what occurs in the thermal spray process (without full fusion of the particles) [31]. The laser re-melting process can help the homogenization of composition and consequent elimination of the monoclinic phase.…”

Section: Phase Compositionmentioning

confidence: 99%

Influence of columnar grain microstructure on thermal shock resistance of laser re-melted ZrO2-7wt.% Y2O3 coatings and their failure mechanism

Fan

Wang

Dong

et al. 2015

Surface and Coatings Technology

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“…Surface treatments modify coating surface condition, which improves coating oxidation performance. Commonly used surface treatment methods include mechanical polishing [92], shot-peening [93,94], electron beam treatment [95][96][97][98], laser-surface treatment [99,100] and so on. The positive effects can be summarized as follows:…”

Section: Role Of Surface Treatmentsmentioning

confidence: 99%

Asset Liability Management for Tanzania Pension Funds

Zhang

2018

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Linköping 2018Front page images: (1) low magnification of snowflake like α-Al 2 O 3 formed on polished coating surface after 10 h oxidation; (2) blade-like transient Al 2 O 3 formed on shot-peened coating surface after 100 min oxidation; (3) spinel island formed on polished coating surface after 10 min oxidation. AbstractMCrAlY coatings (M=Ni and/or Co) have been widely used for the protection of superalloy components against oxidation and hot corrosion in the hot sections of gas turbines. The drive to improve engine combustion efficiency while reducing emissions by increasing the operation temperature brings a big challenge for coating design. As a result, the need for improvement of MCrAlY coatings for better oxidation resistance is essential.Formation of a stable, dense, continuous, and slow-growing α-Al 2 O 3 layer, on the MCrAlY coating surface, is the key to oxidation protection, since the protective α-Al 2 O 3 scale offers superior oxidation resistance due to its lower oxygen-diffusion rate as compared with other oxides. The ability of a MCrAlY coating to form and maintain such a protective scale depends on the coating composition and microstructure, and can be improved through optimization of deposition parameters, modification of coating surface conditions, and so on. Part of this thesis work focuses on studying the effect of post-deposition surface treatments on the oxidation behavior of MCrAlX coatings (X can be yttrium and/or other minor alloying elements). The aim is to gain fundamental understanding of alumina scale evolution during oxidation which is important for achieving improved oxidation resistance of MCrAlX coatings. Oxide scale formed on coatings at initial oxidation stage and the effect of surface treatment were investigated by a multi-approach study combining photo-stimulated luminescence, microstructural observation and weight gain. AcknowledgementsThe present project is financed by Siemens Industrial Turbomachinery AB, Swedish Energy Agency through KME consortium -ELFORSK, and are therefore grateful

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High temperature oxidation behavior of laser cladding MCrAlY coatings on austenitic stainless steel

Cited by 63 publications

References 28 publications

Non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat

Non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat

Influence of columnar grain microstructure on thermal shock resistance of laser re-melted ZrO2-7wt.% Y2O3 coatings and their failure mechanism

Asset Liability Management for Tanzania Pension Funds

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