Evolution of multilayered scale structures during high
Evolution of multilayered scale structures during high temperature oxidation of ZrSi2Volume 31 Issue 21
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Metastable Austenite Scientific.Net
Sufficient amount of cooling martensite can be traced in the analyzed steel after high-temperature quenching (cooling up to the temperature of-70°С). Being combined with residual metastable austenite it provides the increase of abrasive wear resistance by 25 compared with high temperature annealing.
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Phase evolution with temperature in chromium-containing
Nov 01 2018 · The Cr (VI)-containing phase CaCrO 4 formed at 500–700 °C while Ca 4 Al 6 CrO 16 formed in the intermediate temperature regime (900–1300 °C). The Cr (III) containing (Al Cr) 2 O 3 solid solution phase started to form at 1100 °C which predominantly formed at 1500 °C.
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A high-strength silicide phase in a stainless steel alloy
Apr 10 2018 · Wear- and corrosion-resistant hardfacing steels rely on carbon for strengthening. Here the authors report an ultra-high strength silicide phase that could lead to a new class of silicide
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Microstructure evolution of carbidic austempered ductile
Nov 19 2020 · This work aims to elucidate the microstructure characteristics of each phase in carbidic austempered ductile iron and the nucleation and growth of acicular ferrite in an austempering temperature range of 250–450 °C. The research results showed that the carbides (Fe Cr)3C obtained by the eutectic reaction had high indentation hardness and indentation modulus and the interface
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Phase Transformations and Complex Properties Research Group
The patterns in which atoms are arranged in the solid state determine properties. These arrangements can be manipulated by altering parameters such as the chemical composition temperature and magnetic field. A phase transformation is a change in the pattern of atoms. We work on phase transformations and the relationship between structure and properties.
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High Temperature Wear Research PapersAcademia.edu
Wear tests were performed by a ball-on-disc wear device with a high-temperature wear module. In microstructural investigation of the materials it was benefited from traditional characterization methods such as SEM EDX analysis and microhardness measurement.
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A fracture-resistant high-entropy alloy for cryogenic
Fig. 1 Microstructure and mechanical properties of the CrMnFeCoNi high-entropy alloy. (A) Fully recrystallized microstructure with an equiaxed grain structure and grain size of 6 μm the composition is approximately equiatomic and the alloy is single-phase as shown from the EDX spectroscopy and XRD insets.(B) Yield strength σ y ultimate tensile strength σ uts and ductility (strain to
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SteelWikipedia
Steel is an alloy of iron with typically a few tenths of a percent of carbon to improve its strength and fracture resistance compared to iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant need typically an additional 11 chromium.Because of its high tensile strength and low cost steel is used in buildings infrastructure tools
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Impact of L12-Ordered Precipitation on the Strength of
L12-ordered phase gamma prime (γ ) is the most important precipitate for high-temperature strengthening in Ni-based superalloys. In the present work we demonstrate that addition of 2.8 wt. Cu to an AFA steel promotes the formation of an L12-ordered phase with the dominating elements Ni
Get PriceNi-Cr-Ta-Al-C complex phase alloyDesign microstructure
Jan 10 2018 · The alloy s microstructure should provide a high strength and corrosion resistant matrix at elevated temperatures combined with hard phases to ensure increased wear resistance. Nickel based alloys strengthened by the intermetallic Ni3 (Al Ti) compound designated as the γ phase provide high temperature strength.
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Influence of Vanadium and Boron Additions on the
One of the well-known abrasion resistant ferrous materials is high chromium white cast iron (20–30 Cr 3.5–4 C and 1–5 Mo) which has excellent wear resistance but unfortunately poor toughness or ductility due to the bigger matrix grain size and the massive brittle leduburitic eutectic carbide precipitations that occur in a continuous
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Evolution of the Structure and Properties of High-Chromium
Feb 25 2020 · The evolution of the structural-phase state of the VZh159 alloy fabricated by selective laser melting after various types of thermal exposure and hot isostatic pressing (HIP) is studied. The effect of a long 500-h exposure at temperatures of 800 and 900°C on the phase composition and morphology of structural components is determined. The short-term and long-term strength of the
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Phase Transformations and Complex Properties Research Group
The patterns in which atoms are arranged in the solid state determine properties. These arrangements can be manipulated by altering parameters such as the chemical composition temperature and magnetic field. A phase transformation is a change in the pattern of atoms. We work on phase transformations and the relationship between structure and properties.
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USASurface alloyed high temperature alloys
USA US08/839 831 USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords alloy chromium base alloy range silicon Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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USB2Co-Cr-Mo-based alloy and production method
A Co—Cr—Mo-based alloy includes 63 mass ≦Co<68 mass 15 mass ≦Cr<26 mass 10 mass ≦Mo<19 mass and the balance of inevitable impurities wherein the total amount of Cr and Mo is from 32 mass to 37 . The mass magnetic susceptibility of the alloy is 7 4π·10 −9 m 3 /kg or less at room temperature and the Vickers hardness number (Hv) of the alloy is 400 or more.
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(PDF) Heat Treatment of Thermal Spray Duplex Coating
The use of duplex coating system of nickel significantly thick diffusion interfaces Figure 1. chromium alloy and aluminum promotes the advantages of both materials the chemical resistant NiCr alloy behaves as a barrier layer preventing the penetration of corrosive species into the steel substrate while the cheaper aluminum coating acts as a
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Ni-Cr-Ta-Al-C complex phase alloyDesign microstructure
Jan 10 2018 · The alloy s microstructure should provide a high strength and corrosion resistant matrix at elevated temperatures combined with hard phases to ensure increased wear resistance. Nickel based alloys strengthened by the intermetallic Ni3 (Al Ti) compound designated as the γ phase provide high temperature strength.
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A study on low-cycle fatigue of high chromium heat
The purpose of this study is to examine the low-cycle fatigue (LCF) characteristics of high-chrome heat-resistant steel which is used in a high-temperature environment at both ambient and high
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Structure of a cast high-strength corrosion-resistant
The phase composition and fine structure of a high-strength corrosion-resistant 05Kh20AG10N3MF austenitic steel containing 0.40 or 0.53 N are studied by X-ray diffraction and electron microscopy.
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Structure of a cast high-strength corrosion-resistant
The phase composition and fine structure of a high-strength corrosion-resistant 05Kh20AG10N3MF austenitic steel containing 0.40 or 0.53 N are studied by X-ray diffraction and electron microscopy.
Get PriceEvolution of Phases in a Recycled Al-Si Cast Alloy During
May 03 2011 · With further increase in solution temperature more than 515 C and solution treatment time more than 4 hours tensile strength decreases during the whole period as a result of gradual coarsening of eutectic Si increase of inter particle spacing and dissolution of the Al 2 Cu phase
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Impact of L12-Ordered Precipitation on the Strength of
L12-ordered phase gamma prime (γ ) is the most important precipitate for high-temperature strengthening in Ni-based superalloys. In the present work we demonstrate that addition of 2.8 wt. Cu to an AFA steel promotes the formation of an L12-ordered phase with the dominating elements Ni
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ChromiumWikipedia
Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6.It is a steely-grey lustrous hard and brittle transition metal. Chromium is the main additive in stainless steel to which it adds anti-corrosive properties.Chromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing.
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Comparative Analysis of Laser and Plasma Surfacing by
Structural instability of temperature resistant steels and nickel alloys is influenced by level of substructural changes i.e. dislocation density evolution recrystallization and recovery intermetallic phase and carbide formation and dissolution change of phase morphology (distribution shape size) decomposition of perlite bainite and
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Microstructure and properties of (Ti Cr) C reinforced
Mar 01 2021 · Through the energy dispersive spectra (EDS) analysis of the wear surface a large number of TiC hard phase substances appear in steel B while no titanium compounds are observed in the blank. Chromium and manganese containing substances are basically the same in
Get PriceEffects of Temperature on the Hardness and Wear
with those of commercial wear-resistant Stellite 3 and Stellite 12. The worn surfaces of the STELLITE alloys are a range of cobalt-chromium on high-temperature wear behavior of Stellite 6
Get PriceMetallurgy of co based alloys produced by powder bed
Sep 17 2019 · • High temperature cobalt-base alloys are more resistant to corrosion due to their more homogeneous microstructure and presence of Mo over W however their performance is still lower than Co-Ni-Cr-Mo alloys • Several Co-Ni-Cr-Mo alloys with low carbon contents are produced in wrought form to fulfill the industrial needs of high strength and
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High temperature study of the evolution of the tribolayer
Aug 01 2020 · The composition of the triboxide formed on surface of the samples was identified using Raman spectroscopy which was carried out on the wear tracks of the worn samples. Comparison of the Raman results obtained from inside and outside the wear track was also conducted for the high temperature tests (T > 200 °C). The results are shown in Fig. 9.
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