High-temperature oxidation behavior of laser-aided additively manufactured NiCrAlY coating

Ansari, Mohammad; Razavi, Reza Shoja; Barekat, Masoud; Man, Hau Chung

doi:10.1016/j.corsci.2017.02.001

Cited by 51 publications

(11 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1200 °C) is critical to guiding the design for the advanced oxidation-resistant coatings, but has received only limited attention in previous literatures. It has been demonstrated by Ansari et al that a considerable ratio of spallation and fracture of TGO occurred after merely three to ten cycles (10 h/cycle) at 1200 °C for the fully dense and thick (~600 μm) NiCrAlY coating manufactured through a laser-aided process [17]. These results indicate that the oxidation and spallation resistance of NiCrAlY coating at 1200 °C could not perhaps meet the requirement of long-term service for gas-turbines or aerospace engines.…”

Section: Introductionmentioning

confidence: 98%

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

et al. 2020

View full text Add to dashboard Cite

In this study, a new type of Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy was fabricated and reported. Its oxidation behavior was investigated at 1200 °C compared with the conventional NiCoCrAlYHf alloy. The superior oxidation performance of the Y/Hf-doped Al0.7CoCrFeNi at 1200 °C is attributed to the dramatically enhancing homogeneity of Y/Hf-rich precipitates distribution at phase boundaries resulting from the intrinsic nano-sized phases in the alloy. The improving homogeneity of Y/Hf distribution is beneficial to inhibit the formation of interfacial imperfections and the interfacial S segregation, thus contributing to an enhancing interfacial adhesion and a strong resistance to TGO spallation.

show abstract

Section: Introductionmentioning

confidence: 98%

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, in the local area, some columnar dendrites are of disordered growth directions. This phenomenon of disordered dendrites has been found in the study of laser cladding of NiCrAlY coatings [ 27 , 28 ].…”

Section: Resultsmentioning

confidence: 60%

Microstructure and Wear Property of ZrO2-Added NiCrAlY Prepared by Ultrasonic-Assisted Direct Laser Deposition

Song

Zhang

et al. 2021

Materials

View full text Add to dashboard Cite

For improving the wear properties of NiCrAlY, the 10 wt %, 20 wt % and 30 wt % ZrO2-added NiCrAlY samples were prepared by ultrasonic-assisted direct laser deposition, respectively. The results showed that the ultrasonic-assisted direct laser deposition can realize the ZrO2-added NiCrAlY preparation. Furthermore, due to the cavitation effect and agitation of the ultrasound in the molten pool, ultrasonic-assisted could make the upper surface of the samples smoother and flatter, and it also improved the microstructural homogeneity. The microstructure was mainly composed of columnar dendrites, and most of ZrO2 particles were located in the intergranular regions. The principal phase constituents were found to contain γ-Ni and t-NiZr2, and the amorphous (Ni, Zr) intermetallic phase generated, because of more rapid solidification after ultrasound assisted. The microhardness was improved slightly with the increase of ZrO2 contents, rising from 407.9 HV (10% ZrO2) to 420.4 HV (30% ZrO2). Correspondingly, wear mass loss was decreased with the maximum drop 22.7% of 30% ZrO2 compared to that of 10% ZrO2, and wear mechanisms were mainly abrasive wear with slightly adhesive wear. After applying ultrasound, the oxide islands in samples disappeared, and more ceramic particles were retained. Thus, the hardness and wear performance of the samples were improved.

show abstract

“…The NiCrAlY powder used in this study has the composition of Ni–22Cr–10Al–1Y. According to the Ni(Cr)‐Al pseudo binary phase diagram (Figure ) calculated in the literature of Ansari, this composition ratio is very close to the eutectic ratio of γ and β , so the shaped sample may contain eutectic microstructure. When the content of NiCrAlY is 60%, the Al element ratio reaches to 6%.…”

Section: Experimental Results and Analysismentioning

confidence: 88%

Microstructure and Mechanical Properties of Inconel718–NiCrAlY Composites Prepared by Laser Engineered Net Shaping

et al. 2018

View full text Add to dashboard Cite

Near-defect-free block Inconel718-NiCrAlY composites prepared by laser engineered net shaping are investigated in this study. XRD, SEM, and EDS are applied to analyze the phase composition and microstructure characteristics. The mechanical properties are evaluated by microhardness tester and friction-wear tester. The results show that NiAl brittle intermetallic compounds precipitate in the matrix when NiCrAlY content reaches 60% or more. With the increase of NiCrAlY ratio, the distribution of NiAl changes from intergranular precipitation to intragranular precipitation, and the dendrites growth directions become chaotic. The microhardness of composites improves as the NiCrAlY content rises, reaching to 419 HV for 100% NiCrAlY, and solid solution strengthening has better strengthening effect on microhardness than precipitation strengthening. The wear loss has a clear decrease only when 80% or more NiCrAlY is added, with the maximum wear loss drop of 15.66% for 100%NiCrAlY. The wear mechanisms change from the coexistence of adhesive wear and abrasive wear to mainly abrasive wear with micro brittle fractures when NiCrAlY content is high.

show abstract

High-temperature oxidation behavior of laser-aided additively manufactured NiCrAlY coating

Cited by 51 publications

References 36 publications

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

Microstructure and Wear Property of ZrO2-Added NiCrAlY Prepared by Ultrasonic-Assisted Direct Laser Deposition

Microstructure and Mechanical Properties of Inconel718–NiCrAlY Composites Prepared by Laser Engineered Net Shaping

Contact Info

Product

Resources

About

High-temperature oxidation behavior of laser-aided additively manufactured NiCrAlY coating

Cited by 51 publications

References 36 publications

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

Microstructure and Wear Property of ZrO2-Added NiCrAlY Prepared by Ultrasonic-Assisted Direct Laser Deposition

Microstructure and Mechanical Properties of Inconel718–NiCrAlY Composites Prepared by Laser Engineered Net Shaping

Contact Info

Product

Resources

About

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C

Y/Hf-doped Al0.7CoCrFeNi high-entropy alloy with ultra oxidation and spallation resistance at 1200 °C