Creep mechanisms of ferritic oxide dispersion strengthened alloys

Wasilkowska, Anna; Bartsch, M.; Messerschmidt, U.; Herzog, R.; Czyrska‐Filemonowicz, A.

doi:10.1016/s0924-0136(02)00237-6

Cited by 77 publications

(42 citation statements)

References 7 publications

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“…This provides barriers to both dislocation glide and climb 1,92 . The yield strength also depends on these features and can be used to provide a measure of the material internal resistance.…”

Section: Origins Of Internal Resistancementioning

confidence: 99%

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Chen

Flewitt

Cocks

et al. 2014

International Materials Reviews

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When polycrystalline metals and their alloys are used at high temperature, creep deformation leads to changes in their internal state. The change in internal state manifests itself in many ways, but the two ways that concern us in this review are (i) the creation of internal stress arising from the strain incompatibility between grains and/or the formation of cell/sub-grain structures and (ii) a change in the material resistance. This review aims to provide a clear separation of these two concepts by exploring the origin of each term and how it is associated with the creep deformation mechanism. Experimental techniques used to measure the internal stress and internal resistance over different length-scales are critically reviewed. It is demonstrated that the interpretation of the measured values requires knowledge of the dominant creep deformation mechanism. Finally, the concluding comments provide a summary of the key messages delivered in this review and highlight the challenges that remain to be addressed.

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Section: Origins Of Internal Resistancementioning

confidence: 99%

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Chen

Flewitt

Cocks

et al. 2014

International Materials Reviews

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“…New generation iron superalloys contain elements from the lanthanide and actinide groups (e.g., La, Th, and Y), which improve alloys' resistance to high-temperature oxidation [2,10,15]. In the group of wrought superalloys, ODS alloys have been gaining importance over the latest period, as well as alloys produced by powder metallurgy methods (P/M) [2,13,[15][16][17][18][19]. A detailed breakdown of the interaction of the main alloying elements in iron and nickel superalloys is presented in Table 2.…”

Section: Superalloysmentioning

confidence: 99%

“…In this way, areas rich in Ti and Al were formed homogenously in the matrix. Fine lenticular lamellae of phase G (Ni 16 Ti 6 Si 7 ) in the form of chains, characteristic of discontinuous precipitation, appeared on grain boundaries (Figure 9). In the case of extending the aging time (within a range of 16 h -500 h), the kinetics increased the homogeneous precipitation of the γ' phase particles in the matrix (Figure 10).…”

Section: Precipitation Processes In the Fe-ni Superalloy During Prolomentioning

confidence: 99%

Analysis of the Precipitation and Growth Processes of the Intermetallic Phases in an Fe-Ni Superalloy

Ducki¹

2015

Superalloys

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The chapter characterizes wrought iron-base superalloys and comprises two main parts. The first describes the chemical composition, microstructure, and precipitation reactions in Fe-Ni, Ni-Fe, and Fe-Cr superalloys. The second part presents the influence of prolonged aging on the precipitation and growth processes in an Fe-Ni superalloy of A-286 type. The prepared specimens, after solution heat treatment at 980°C/2 h/water, were aged at temperatures of 715°C, 750°C, and 780°C with the holding time of 0.5-500 h. Transmission electron microscopy (TEM) and X-ray diffraction were used to examine their structures. It was found, that application of a single-stage aging causes precipitation processes of γ' -Ni 3 (Al,Ti), η -Ni 3 Ti, β -NiTi, G -Ni 16 Ti 6 Si 7 , and σ -Cr 0.46 Mo 0.40 Si 0.14 intermetallic phases, as well as the carbide M 23 C 6 and boride M 3 B 2 . The main phase precipitating during alloy aging was the γ'-type intermetallic phase. It was found that the mean diameter of γ' phase precipitates increases as a function of the cube root of aging time, which is consistent with the predictions based on the Lifshitz-Slyozow-Wagner (LSW) theory. The determined value of activation energy for the process of γ' phase coagulation in the examined alloy was E = 297 kJ/mole.

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“…[1,2] Such properties are achieved by the incorporation of elements such as aluminium and chromium which can form stable protective oxide barriers on the metal surface. The addition of a nano-scale, thermally stable dispersion of oxide particles based on yttria enhances the high temperature mechanical properties by impeding dislocation movement and encouraging a coarse grain structure on recrystallisation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fe–Cr–Al Oxide Dispersion Strengthened PM2000 Alloy Using Selective Laser Melting

Walker¹,

Berggreen²,

Jones³

et al. 2009

Adv Eng Mater

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Creep mechanisms of ferritic oxide dispersion strengthened alloys

Cited by 77 publications

References 7 publications

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Analysis of the Precipitation and Growth Processes of the Intermetallic Phases in an Fe-Ni Superalloy

Fabrication of Fe–Cr–Al Oxide Dispersion Strengthened PM2000 Alloy Using Selective Laser Melting

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