Effect of compressive stresses on oxidation kinetics and oxide scale failure of pure nickel at 973 K

2009 ◽  
Vol 44 (5) ◽  
pp. 358-361 ◽  
Author(s):  
C. H. Zhou ◽  
H. T. Ma ◽  
L. Wang
Keyword(s):  
Oxide Scale ◽  
Oxidation Kinetics ◽  
Pure Nickel ◽  
Compressive Stresses ◽  
Scale Failure

scholarly journals Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys

2021 ◽  
Author(s):  
Anke S. Ulrich ◽  
Uwe Glatzel ◽  
Mathias C. Galetz
Keyword(s):  
Oxide Scale ◽  
Oxidation Kinetics ◽  
Parabolic Rate Constant ◽  
Mass Gain ◽  
Linear Mass ◽  
Isothermal Exposure ◽  
Growth Stresses ◽  
Scale Failure ◽  
Insight Into ◽  
Rapid Mass

AbstractSome alloys such as many Cr-based systems show mass gain discontinuities during thermogravimetric measurements which strongly affect the oxidation kinetics. The behaviour cannot be described by the current models available in the literature. Thus, a novel $$k_\mathrm{para}$$ k para –$$k_\mathrm{lin}$$ k lin -P-model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant $$k_\mathrm{para}$$ k para and the linear mass loss constant $$k_\mathrm{lin}$$ k lin , the P-value and $$f_P$$ f P are introduced to take into account spontaneous rapid mass gains due to local oxide scale failure. The parameter P serves as a measure for the mass gain due to discontinuous events and $$f_P$$ f P is the frequency of such events. The both parameters can be related to oxide scale detachment and growth stresses. The application of the model is demonstrated for the oxidation of Cr–Si-based alloys in synthetic air at $$1200^{\circ }\hbox {C}$$ 1200 ∘ C for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and $$f_P$$ f P is explained in more detail. Using this newly developed model, an insight into growth and nitridation resistance of oxide scales as well as scale adhesion is gained.

The Influence of Diffusion-Related Mechanisms in Limiting Oxide-Scale Failure

1995 ◽  
Vol 41 ◽  
pp. 137-156 ◽  
Author(s):  
Hugh E. Evans ◽  
John R. Nicholls ◽  
Stuart R.J. Saunders
Keyword(s):  
Oxide Scale ◽  
Scale Failure

Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel

2014 ◽  
Vol 21 (3) ◽  
pp. 335-341 ◽  
Author(s):  
Guang-ming Cao ◽  
Xiao-jiang Liu ◽  
Bin Sun ◽  
Zhen-yu Liu
Keyword(s):  
Carbon Steel ◽  
Oxide Scale ◽  
Oxidation Kinetics ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Kinetics Of

High Temperature Oxidation of Fe-9Cr-1Mo Steel in Liquid Metal

2008 ◽  
Vol 595-598 ◽  
pp. 519-528 ◽  
Author(s):  
Laure Martinelli ◽  
Fanny Balbaud-Célérier ◽  
Gerard Picard ◽  
Gerard Santarini
Keyword(s):  
Oxide Scale ◽  
Oxidation Kinetics ◽  
Oxidation Mechanism ◽  
Lattice Diffusion ◽  
Experimental Results ◽  
Liquid Lead ◽  
Regulation Mechanism ◽  
Scale Growth ◽  
Temperature Oxidation ◽  
Steel Oxidation

The oxidation mechanism of the T91 martensitic steel in oxygen-saturated Pb-Bi eutectic at 470°C has been investigated to develop a long term predictive model of the steel oxidation kinetic. This work is performed in the frame of life duration studies carried out for the MEGAPIE spallation module demonstrator dedicated to the feasibility demonstration of an hybrid reactor. Our scientific approach has been based on an experimental characterization of the oxide scales and of the T91 steel oxidation kinetics. From these experimental results, an oxidation mechanism has been elaborated and then simulated. The oxide scale formed at the T91 surface has a duplex structure, constituted of an external magnetite scale and an internal Fe-Cr spinel scale. A scale growth mechanism has been proposed: the magnetite scale growth seems to be limited by the iron lattice diffusion inside the duplex oxide scale. At the same time, a self-regulation mechanism seems to govern the Fe-Cr spinel scale growth. This mechanism consists of a non-limiting oxygen diffusion step, which is carried out, across the oxide scale, inside liquid lead nano-channels and a limiting iron oxide lattice diffusion step. Considering the proposed oxidation mechanism, a simulation of the growth of the two oxides scales has been carried out and compared to the experimental oxidation kinetics. The excellent agreement between the experimental results and the simulations supports to accept the proposed mechanism, leading to prediction of kinetics for long oxidation durations.

Isothermal Oxidation Behavior of Ni Base Superalloy DM02 for High Temperature Dies

2007 ◽  
Vol 546-549 ◽  
pp. 1253-1256
Author(s):  
Qing Li ◽  
Jin Xia Song ◽  
Cheng Bo Xiao ◽  
Shi Yu Qu ◽  
Ding Gang Wang ◽  
...  
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Oxide Scale ◽  
Oxidation Resistance ◽  
Growth Mechanism ◽  
Oxidation Kinetics ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Good Oxidation Resistance ◽  
Base Superalloy

The isothermal oxidation behavior of a new developed Ni base superalloy named DM02 for high temperature dies was studied in this paper. The dynamic curve was achieved by monitoring weight gain of the alloy as a function of time. The results showed that the alloy had fairly good oxidation resistance at 1050°C and 1100°C. The oxidation kinetics at both 1050°C and 1100°C followed parabolic rules in segment. It has been found that the oxidation of the alloy was controlled by multi-oxides of (Ni, Co)O, (Ni, Co)Al2O4, and NiWO4, growth mechanism in the primary stage, and by Al2O3, NiAl2O4 growth mechanism in the following stage. After oxidation at 1050°C for 100h, the oxide scale of the alloy was mainly composed of two areas. Some were thin uniform (Ni， Co)Al2O4(outer)/Al2O3 (inner) composites scale and others were multi-layer oxide scale of ( Ni,Co)O / multi-oxides (mainly NiWO4、NiO and NiAl2O4.) /Al2O3.

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