influence of high temperature oxidation on the creep behaviour of Fe-5% Al. alloy by C. S. Madueke

Cover of: influence of high temperature oxidation on the creep behaviour of Fe-5% Al. alloy | C. S. Madueke

Published by UMIST in Manchester .

Written in English

Read online

Edition Notes

Book details

StatementSupervised by: Rolls, R..
ContributionsRolls, R., Supervisor., Metallurgy and Materials Science.
ID Numbers
Open LibraryOL19657864M

Download influence of high temperature oxidation on the creep behaviour of Fe-5% Al. alloy

Niobium has been considered for applications in the aerospace sector, but its use at high temperatures is restricted, due to the great affinity of refractory metals with oxygen, which results in the formation of oxide layers and a decrease in their mechanical resistances. In the present work, Nb samples were submitted to High-Temperature Nitrogen Plasma-Based Ion Implantation (HT-NPBII).

The creep behavior of various pack cementation aluminide coatings on Grade 91 ferritic-martensitic steel was investigated at C in laboratory air. The coatings were fabricated in two temperature regimes, i.e., or C (low temperature) and C(high temperature), and consisted of a range of Al levels and thicknesses.

Wang et al. found that Si facilitated the formation of Al 2 O 3 layer during high temperature oxidation of binary Ni-Al alloys and ternary Ni-Cr-Al alloys in oxygen. However, the effect of Si-alloying on the oxidation behavior of AlCrFeCoNi-based HEAs has Cited by: Subse- quently, the high-temperature oxidation behaviour of macro-alloyed Ti in Mo-Si-B system was reported [12][13] [14] indicating the beneficial effect of Ti on oxidation resistance at a wide.

The high-temperature creep behavior of Al–Cu–Mg alloy was studied by the constant-stress uniaxial tensile creep experiments under the temperatures of K, K and K.

Constitutive models for describing the high-temperature creep behavior of Al–Cu–Mg were established based on the θ projection method. The material parameters of the established constitutive models are Cited by:   In the present study the oxidation behaviour of six different FeCrAl alloys with Al concentrations in the range of – wt% have been characterised after oxidation at °C for 72 h with respect to oxide layer surface morphology, thickness and composition using scanning electron microscopy, energy dispersive X‐ray spectroscopy and.

The high-temperature creep behavior of T3 Al alloy was studied by the constant-stress uniaxial tensile creep experiments under the temperatures ofand K.

Constitutive models. Oxidation behaviour of Fe-Al-Si alloys at and K (S. Guan et al.). High temperature oxidation of iron-aluminum alloys (R. Prescott et al.). Oxidation of Fe-Cr-Mn-Ai stainless steels (K.

Kurokawa et al.). Structure and oxidation behaviour of the scale formed on Al-containing ferritic stainless steel (S. Sasayama, T. Kamiya). @article{osti_, title = {High-temperature oxidation of advanced FeCrNi alloy in steam environments}, author = {Elbakhshwan, Mohamed S.

and Gill, Simerjeet K. and Rumaiz, Abdul K. and Bai, Jianming and Ghose, Sanjit and Rebak, Raul B. and Ecker, Lynne E.}, abstractNote = {Alloys of iron-chromium-nickel are being explored as alternative cladding materials to improve safety margins under. Metals and alloys rely for their application at high temperature on the formation and retention of oxide scales, which act as a barrier between the metallic substrate and the reactive species in the environment such as 0, S, N, C, Cl, etc.

This protection concept requires that the oxide grows. Zhao et al. 22 further developed Zaeem’s model to deal with inelastic deformation during high-temperature oxidation.

In their models, however, stress only affected diffusivity. In their models. A study was conducted to examine the isothermal oxidation behavior of a wrought Ni-Cr-Al-Fe-Y alloy in air at temperatures in the range of –°C. Oxidation kinetics were determined from weight-change measurements.

Analytical electron microscopy, scanning electron microscopy, and x-ray diffraction were used to characterize the morphology, structure, and composition of the oxide scale. Creep damage investigation was carried out in Fe-Ni-Cr alloy at °C, °C, and °C using rectangular section form of specimen.

In all the tests conducted influence of high temperature oxidation on the creep behaviour of Fe-5% Al. alloy book this material, some creep curves showed primary stage, secondary stage and tertiary stage.

The creep fracture shows ductile transgranular fracture where separation occurred at the dendrites carbide interface suggesting that the. The influence of oxidation on the estimation of long-term creep rupture strength is investigated for % chromium (Cr)–1% molybdenum (Mo) steel specified as JIS S JIS SCMV 4 NT, and ASTM A/AM by the Larson–Miller method using creep rupture data in the National Institute for Materials Science (NIMS) Creep Data Sheets at – °C for up toh.

model is provided to explain the observed oxidation behaviour of these alloys. HIGH TEMPERATURE OXIDATION BEHAVIOUR OF TWO-PHASE CARBON CONTAINING Fe 3 Al INTERMETALLICS Recently, Shankar Rao et al 11 published a detailed study on the long-term oxidation behaviour of FeAl intermetallics with C ranging form to 1%.

The effect of prior oxidation at K on the creep behavior of an Fe-Ni-Cr-Al alloy, hardened by ordered NiAl precipitates, has been investigated at K over a stress range of to MPa. The alloy in the as-electroslag remelted (ESR) as well as the ESR-plus-hot-worked conditions was considered.

Prior oxidation causes creep strengthening in the Fe-Ni-Cr-Al alloy, resulting in a. The objective of this work was to study the influence of equiaxed and Widmanstätten microstructures on oxidation rates and creep behavior of the Ti-6Al-4V alloy.

The samples were exposed to different conditions of time and temperature to evaluate the oxidation rates. The High Temperature Creep Behavior of Oxides and Oxide Fibers LI Influence of temperature on the creep rate of polycrystalline ThO2 Their inherent high-temperature oxidation resistance is also a key advantage in the use of ceramics.

Ceramics and glasses exhibit. The UK has unique experience in operating high temperature civil nuclear power systems, known as advanced gas cooled reactors (AGRs). One of the primary challenges for extending the lifetime of the AGR power stations is to understand the interaction that occurs between the AGR CO2 environment and creep-fatigue cracking behaviour.

This is one of the life limiting degradation mechanisms for. In this study, the ultrahigh-temperature tensile creep behaviour of a TiC-reinforced Mo-Si-B-based alloy was investigated in the temperature.

The creep tests were conducted on a standard creep machine at stress of MPa to MPa. Samples with a gage length of mm and a diameter of 3 mm were used for all tests. When the Ti-6Al-4 V was tested the effect of the oxidation was smaller and the behavior of the creep curves showed that the life time was better.

There was a decreasing. A superalloy, or high-performance alloy, is an alloy with the ability to operate at a high fraction of its melting point.

Several key characteristics of a superalloy are excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation. The crystal structure is typically face-centered cubic (FCC) austenitic. Influence of Temperature The creep rate of a material can be greatly reduced by the incorporation of a fine dispersion of nondeformable particles at grain boundaries.

Medraj Mech. Eng. Dept. – Concordia University MSE Lecture 14/12 Superplastic deformation of an Al alloy Movement of grains during superplastic deformation of a Pb-Sn. Influence of additional elements on the oxidation behaviour of Nb-Al-Cr base alloys p.

Influence of ion implantation of several elements on oxidation behavior of TiAl p. Isothermal oxidation of sintered [beta]-FeSi[subscript 2] in air p. High temperature oxidation of TiAlwt.%Mn-(0, 5, 10)wt.%Y[subscript 2]O[subscript 3] alloys p.

The influence of annealing on high-temperature creep of a Fe 3Al-type iron aluminide alloyed by niobium and different additions of carbon was studied in the temperature range from to °C. The alloys contained (atomic %) (i) Al, Nb, C and (ii) Al, Nb, C (Fe balance).

To further confirm the effect of oxidation on the creep behavior of DS+Hf alloy, thin-wall creep experiments have been performed at °C/ MPa. Figure 8 shows the evolution of the relative creep life as a function of the P/S ratio (perimeter of the gage section over load bearing section ratio).

the high-temperature creep behavior of Alloya high-chromium alloy that is widely used in coal conversion systems, after exposure to oxygen and oxygen/sulfur mixed-gas environments over a wide temperature range.

In addition, data on the creep behavior of the alloy under various pretreatment and. Alloy is the leading candidate material for an intermediate heat exchanger (IHX) of the very high temperature reactor (VHTR), expected to have an outlet temperature as high as °C.

Acceptance of Alloy in Section III of the ASME Code for nuclear construction requires a detailed understanding of the creep-fatigue behavior. The high-temperature creep resistance in Al 2 O 3 is highly improved by the rare-earth oxide doping in the level of mol %, and the creep rate is suppressed in the order La 2 O 3 Al 2 O 3 are found to segregate in Al 2 O 3 grain boundaries.

The influence of surface roughness on its high temperature oxidation for an Ni-base superalloy was studied using laser profilometry, atomic force microscopy, mass change measurements, glow-discharge optical emission spectrometry, scanning electron microscopy, X-ray diffraction, and positron annihilation methods.

The isothermal and cyclic air oxidation tests were performed at °C and. Simultaneous creep and oxidation of an Fe%Cr alloy at °C.

Rolls & A.N. Arayici. Pages: Influence of shot peening on high-temperature corrosion and corrosion-fatigue of nickel based superalloy Li Effect of steam on high temperature oxidation behaviour of alumina-forming alloys Pint et al.

Vol - Issue. Journal of Materials 0 5 10 15 20 9 10 MPa MPa 10 4 1/ (K) F: E ect of temperature on rupture life for stresses. and. MPa. 6 5 4 3.

The high-temperature creep strain of alloys must be limited for them to be used. The creep strain should not exceed 1–2%.

The creep strain should not exceed 1–2%. An additional complication in studying creep behavior of the refractory metals is interactions with environment, which can significantly influence the creep behavior. High Temperature Oxidation Behavior of Cr-1Mo Steel in Air—Part 2: Scale Growth, Metal Loss Kinetics and Stress Enhancement Factors During Creep.

This work investigated the effect of nominal boron (B) additions of mass% and 1mass% on the elevated-temperature (–K) tensile-creep deformation behavior of a Ti-6Al-4V(mass%) alloy for applied stresses between –MPa.

The alloys were evaluated in. L.U.J. Ogbuji et al.: High-temperatureoxidation behavior of reaction-formedsilicon carbide ceramics porous in most cases, the porosity increasing markedly with oxidation temperature. In Fig. 3(a) this is illustrated with a higher-magnification inset of the oxide scale.

Weight change profiles Figure 4 shows the change of specific sample weight. Modelling Creep and Fracture in Engineering Alloys.- High Temperature Creep Mechanisms in Single Crystals of Some High Performance Nickel-Base Superalloys.- Dislocation Microstructure in PM Astroloy and Ma after HTLCF.- Ferritic Fe-Ni-Al Alloys for High Temperature Applications.- Metallographic Indication of Methane in Steel Cavities This work investigated the effect of nominal boron (B) additions of mass% and 1 mass% on the elevated-temperature (– K) tensile-creep deformation behavior of a Ti-6Al-4V(mass%) alloy for applied stresses between – MPa.

The alloys were evaluated in. OXIDATION MECHANISMS IN RELATION TO HIGH TEMPERATURE CRACK PROPAGATION PROPERTIES OF ALLOY 7 18 IN H2/H20/INERT GAS ENVIRONMENT P.F. Browning, M.F. Henry GE Corporate R&D,1 Research Circle, Niskayuna, NY K. Rajan Rensselaer Polytechnic Institute, Materials Engrg.

Dept., 8” Street, Troy, NY Creep and Fracture in High Temperature Components Design and Life Assessment Issues edited by I. Shibli. Creep and Fracture in High Temperature Components is a critically important compendium of European and worldwide research investigating creep, fatigue and failure behaviors in metals under high-temperature and other service stresses.

Comprising over fully refereed and not previously. The hot hardness behaviour of a Fe–28Al–3Cr–C (at.%) alloy was evaluated from room temperature to K. Indentation creep measurements were also carried out in the temperature range of – K.

The hardness–temperature plot of this alloy showed five distinct regions.of Nbl alloy is 58,3lcg/mm _-- the latter is clearly more excellent.

Then, it is reported that the creep rate and the kecrystallixation temperature are to a certain degree related in 15CrNi steel. (5) So, the high temperature properties of this type alloy is supposed to be improved by niobium addition.grain size, etc.) and high-temperature creep behavior was evalu-ated.

The material was chosen because it is a commercially used alloy and, as such, the aim of this study was to show relevance to actual engineering materials in use. 2. Experimental procedure The as-processed (AP) Alloy sheet was mill annealed at C. To produce the TMP.

39642 views Friday, November 13, 2020