scholarly journals HIGH-TEMPERATURE OXIDATION BEHAVIOR OF AN N5 NANOCRYSTALLINE COATING DEPOSITED BY ESD ON A NI-BASED SINGLE-CRYSTAL SUPERALLOY

2021 ◽  
Vol 55 (5) ◽  
Author(s):  
Rongyan Wang ◽  
Quan Liu ◽  
Meng Wang ◽  
Xudong Lu ◽  
Cean Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
High Temperature Oxidation ◽  
Isothermal Oxidation ◽  
Single Crystal Superalloy ◽  
Electrospark Deposition ◽  
Columnar Crystal ◽  
Temperature Oxidation ◽  
Nanocrystalline Coating ◽  
High Temperature Oxidation Behavior

An N5 nanocrystalline coating was prepared on a Ni-based single-crystal superalloy by electrospark deposition. The morphologies, chemical composition, and phase constitution of the coating were analyzed by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The high-temperature oxidation resistance of the substrate and coating at 1100℃ was tested in a static isothermal oxidation experiment. The results show that the electrospark deposition coating with columnar crystal structure is composed of nanocrystalline; there is no elemental interdiffusion between the substrate and the coating, which effectively avoids decreasing the mechanical properties of the substrate alloy due to the interdiffusion. Migration and aggregation of a reactive element, Ta, in the nanocrystalline coating substantially improves oxide film adhesion

High temperature oxidation and γ′ depletion in the single-crystal superalloy PWA 1484

2016 ◽  
Vol 33 (4-5) ◽  
pp. 476-488 ◽  
Author(s):  
Robert L. Amaro ◽  
Stephen D. Antolovich ◽  
Richard W. Neu ◽  
Preet M. Singh
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
High Temperature Oxidation ◽  
Single Crystal Superalloy ◽  
Temperature Oxidation

Effect of WС Content on the Mechanical Properties and High Temperature Oxidation Behavior of Ti(С,N)-Based Cermets

2018 ◽  
Vol 274 ◽  
pp. 9-19
Author(s):  
Guo Tao Zhang ◽  
Yong Zheng ◽  
Yi Jie Zhao ◽  
Wei Zhou ◽  
Jia Jie Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Isothermal Oxidation ◽  
Oxide Scales ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
X Ray ◽  
Oxidation Rates ◽  
High Temperature Oxidation Behavior

Ti (C,N)-based cermets with varying WC additions (Ti (C0.6N0.4)-36Ni-12Mo-1C-xWC, x = 0, 3, 6 and 9 wt%) were prepared by conventional powder metallurgy techniques. The microstructure and mechanical properties of all four Ti (C,N)-based cermets were investigated. Isothermal oxidation of all four cermets were also investigated in air at 800°C up to 100 h using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction analysis (XRD). The grains of Ti (C,N)-based cermets became more homogeneous with the increase of WC content. The TRS and fracture toughness increased with the increase of WC content and then decreased when WC content exceeded 6wt%, but hardness decreased continuously with the increase of WC content. The oxide scales formed on the surface of all four samples during the oxidation process were porous and multi-layered, consisting of NiO outerlayer and TiO2 based innerlayer, respectively. The thickness of the oxide scales and oxidation rates increased with the increase of WC content, especially when the content of WC addition reached 9wt%. The cermet with 6wt% WC addition showed excellent mechanical properties and acceptable high temperature oxidation resistance.

The High Temperature Oxidation Behavior of Hot-Dip Aluminized GH169

2014 ◽  
Vol 900 ◽  
pp. 87-91
Author(s):  
Jin Lou ◽  
Cheng Xiang Ruan
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Molten Aluminum ◽  
Isothermal Oxidation ◽  
Resistance Furnace ◽  
Temperature Oxidation ◽  
Parabolic Law ◽  
Aluminized Steel ◽  
High Temperature Oxidation Behavior

GH169 was coated by hot-dipping in a molten aluminum bath, and then diffusing annealing at 950 °C for 2 h. The high temperature isothermal oxidation behavior of the hot-dipped aluminized alloy and GH169 was tested at 900 °C for 100 h using resistance furnace. The surface morphology and phase composition of the oxide scale were studied by SEM and EDS. The result of high temperature oxidation test showed that oxidation curves of hot-dipped aluminized steel and GH169 followed parabolic law at 900 °C for 100h and the hot-dipped aluminum present more excellent anti-oxidation. A dense film formed on GH169 mainly composed of Cr2O3and TiO2while on hot-dipped aluminized steel is Al2O3.

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