The Effect of Coatings on the Cyclic Oxidation Behaviour of Ti6Al4V at 750°C

2011 ◽  
Vol 393-395 ◽  
pp. 428-435 ◽  
Author(s):  
Ying Yuan Teng ◽  
Qian Chen ◽  
Li Xin
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Ti6al4v Alloy ◽  
Effective Protection ◽  
Tialsin Coating ◽  
Substrate Alloy

For improvement of the cyclic oxidation resistance of the Ti6Al4V alloy, multi-layered Ti50Al50N/Ti70Al30N and mono-layered Ti60Al30Si10N were deposited on the alloy. It has been found that both coatings provide an effective protection for substrate alloy and the cyclic oxidation resistance of the TiAlSiN coating is better. After cyclic oxidation, it has been found that N diffused into the substrate alloy.

Long-Term, Cyclic Oxidation Behaviour of Alumina- and Chromia-Forming Alloys

2005 ◽  
Vol 237-240 ◽  
pp. 1107-1114 ◽  
Author(s):  
Renata Bachorczyk Nagy ◽  
Richard J. Fordham
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Oxide Scale ◽  
Water Vapour ◽  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Reactive Elements ◽  
Funded Project

The oxidation resistance behaviour of a number of surface-treated FeCrAl commercial alloys and some model alloys of well-defined composition, incorporating a range of reactive elements in trace amounts, has been studied under thermal cyclic conditions in air with and without additions of water vapour. Additions of reactive elements such as Zr, La, Y, Hf modify the oxidation resistance behaviour of FeCrAl-alloys by improving the scale adherence and consequently may extend the lifetime of FeCrAl steels. The presence of the water vapour can affect oxidation in a number of different ways. Our results may indicate that high content of water vapour can cause the lives of such alloys to be decreased. This work forms part of a larger European-funded project to evaluate physical properties, microstructural features, oxidation/corrosion resistance and lifetime improvement. The correlation between alloy parameters and lifetime; as well as the modeling of oxide scale behaviour as function of cycling conditions is also studied.

Preparation and Oxidation Behaviour of an Al-Si Coating on a Ni3Al Based Single Crystal Superalloy IC21

2013 ◽  
Vol 747-748 ◽  
pp. 575-581 ◽  
Author(s):  
Yu Zhuo Liu ◽  
Qiong Wu ◽  
Shu Suo Li ◽  
Yue Ma ◽  
Sheng Kai Gong
Keyword(s):  
Phase Transformation ◽  
Oxidation Resistance ◽  
Outer Layer ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Oxidation Behaviour ◽  
Oxide Scales ◽  
Outward Diffusion ◽  
Microstructure Change ◽  
Β Phase

An Al-Si coating was prepared on IC21 alloy by powder pack cementation. The cyclic oxidation tests were carried out at 1150 in air for up to 100 h. The results indicate that the oxidation resistance of IC21 alloy is significantly improved by the Al-Si coating due to the presence of Ni2Al3and β-NiAl enriched outer layer, and Si can effectively supress the outward diffusion of Mo. The oxide scales mainly consist of α-Al2O3, which is the favorite to the oxidation resistance. Phase transformation occurred from β-NiAl to γ-Ni3Al and γ-Ni in the coating during oxidation. The coating still remained a certain amount of β phase after oxidation for 100h, which indicate a good protection. The microstructure change evolution was characterized, and the oxidation behavior of the coating was discussed.

Cyclic Oxidation Performance of Si-Aluminide/MCrAlY Coating on Ni-Base GTD-111 Superalloy

2017 ◽  
Vol 889 ◽  
pp. 159-164
Author(s):  
K. Shirvani ◽  
S.V. Miraboutalebi
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Test Results ◽  
Mcraly Coating ◽  
Mcraly Coatings ◽  
Silica Scale ◽  
Spray Technique ◽  
Oxidation Performance ◽  
Metal Spray

A slurry aluminising process was utilised to produce duplex Si-modified aluminide MCrAlY coatings for superalloy GTD-111. MCrAlY coating was applied by means of high velocity oxy-fuel (HVOF) metal spray technique. Cyclic oxidation behaviour of the aluminide/MCrAlY coating were compared with plain MCrAlY coating. Oxidation performance of the coated samples was investigated by exposing samples to 1 h cyclic oxidation at 1100 °C. Oxidation test results demonstrate the Si-aluminide/MCrAlY coating exhibited much better oxidation resistance than the the uncoated superalloy due to the superior oxidation resistance of the alumina-silica scale at 1100 °C.

STUDY ON CYCLIC OXIDATION RESISTANCE OF HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM

2013 ◽  
Vol 49 (11) ◽  
pp. 1369 ◽  
Author(s):  
Ziqi GONG ◽  
Ziyong CHEN ◽  
Lihua CHAI ◽  
Zhilei XIANG ◽  
Zuoren NIE
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Base Alloy

Effect of substrate alloy composition on the oxidation behaviour and degradation of aluminide coatings on two Ni base superalloys

2020 ◽  
Vol 167 ◽  
pp. 108494 ◽  
Author(s):  
W. Leng ◽  
R. Pillai ◽  
D. Naumenko ◽  
T. Galiullin ◽  
W.J. Quadakkers
Keyword(s):  
Alloy Composition ◽  
Oxidation Behaviour ◽  
Aluminide Coatings ◽  
Substrate Alloy

Difference oxidation behaviors of Ni8Al and Ni25Cr coatings in air with water vapor at 650∘

2021 ◽  
pp. 2150274
Author(s):  
Dingjun Li ◽  
Wenlang Huang ◽  
Xiaohu Yuan ◽  
Taihong Huang ◽  
Chao Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Velocity ◽  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Fuel Spray ◽  
High Velocity Oxygen Fuel ◽  
Service Environment ◽  
Generator Unit ◽  
Oxygen Fuel ◽  
Oxidation Behaviors

The oxidation behaviour of Ni8Al and Ni25Cr coatings produced by high velocity oxygen fuel spray (HVOF) which were deposited on Fe-based alloys (CB2) was investigated. We simulated the service environment of the steam generator unit, and put the samples in a thermostatic tube furnace at 650[Formula: see text] in air with 20 wt.% water vapor for 1000 hours of cyclic oxidation. The formation mechanism are explained using SEM, XRD, and EDX. There were no spallations and obvious cracks in both coatings. Ni25Cr coating generated a better protection oxides scale than that scale on Ni8Al. The behavior and mechanism of the oxide scale formation had an important influence in coatings and we have discussed these phenomenons in the study.

Effects of Yttrium on Cyclic Oxidation Resistance of Co-10Cr-5Al Alloy at 700 °C

2014 ◽  
Vol 528 ◽  
pp. 25-29
Author(s):  
Ling Yun Bai ◽  
Xian Chao Xu ◽  
Jun Huai Xiang ◽  
Yun Xiang Zheng ◽  
Jun Wang
Keyword(s):  
Oxide Scale ◽  
Oxidation Resistance ◽  
Oxidation Rate ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Adhesive Property ◽  
Complex Mode ◽  
Rate Law ◽  
Parabolic Rate

The cyclic oxidation behavior of Co-10Cr-5Al alloys in atmosphere at 700 °C was investigated. The addition of 0.3 at.% Y changed the oxidation behavior from the approximate parabolic rate law to complex mode. The scale grown on the surface of Co-10Cr-5Al cracked seriously, while the oxide scale the Y doped alloy had better adhesive property. Yttrium doped in the sample promoted the forming of continuous Al2O3layer and decreased the oxidation rate of Co-10Cr-5Al alloys.

Interfacial Segregation in Oxide Scales on Nicrai-Based Alloys

1997 ◽  
Vol 3 (S2) ◽  
pp. 785-786
Author(s):  
K. Prüβner ◽  
K. B. Alexander ◽  
B. A. Pint ◽  
P. F. Tortorelli ◽  
I. G. Wright
Keyword(s):  
Cyclic Oxidation ◽  
Oxidation Behaviour ◽  
Reactive Elements ◽  
Oxide Scales ◽  
Protective Oxide ◽  
Form Complex ◽  
Scale Adhesion ◽  
Alumina Formers ◽  
Interfacial Segregation ◽  
Nicral Alloys

Previous studies addressing the segregation of reactive elements in protective oxide scales and their beneficial effect on scale adhesion have primarily concentrated on primary alumina-formers (e.g. β-NiAl + FeCrAl).In our study the oxidation behaviour of three NiCrAl alloys, which form complex scales was studied in air at 1423 K and at 1473 K, both in isothermal (100 h) and in cyclic oxidation (100 x lh). The composition (in at.-%) of these alloys is the following: General Electric alloy René N5 (64.9 Ni, 7.8 Cr, 13.9 Al, 0.1 Fe, 2.1 Ta, 0.05 Hf, 1.6 W, 1.0 Re, 0.15 Si, 7.3 Co, 0.9 Mo, 0.003 Y, 0.003 Zr, 4 ppm S, 0.25 C), Ni-7Cr-6.5Al+Y (80.1 Ni, 7.2 Cr, 12.5 Al, 0.01 Fe, 0.14 Si, 0.012 Y, 18 ppm S, 0.05 C) and Ni-10Cr-10Al+Y (71.2 Ni, 9.9 Cr, 18.8 Al, 0.01 Fe, 0.02 Si, 0.041 Y, 16 ppm S, 0.04 C).

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