Deformation of ODS-Fe-20 Cr-5 Al (PM 2000) Below the Threshold for Dislocation Glide Interpreted in Terms of Diffusive Flow

Weisse, M.; Breutinger, F.; Granacher, J.; Blum, W.

doi:10.1016/s1359-6462(98)00013-x

Scripta Materialia

1998

DOI: 10.1016/s1359-6462(98)00013-x

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Deformation of ODS-Fe-20 Cr-5 Al (PM 2000) Below the Threshold for Dislocation Glide Interpreted in Terms of Diffusive Flow

M. Weisse¹,

F. Breutinger²,

J. Granacher

et al.

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Cited by 3 publications

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“…Some authors account for clustering by considering independent one-particle unit-cell models with different volume fractions and averaging them afterwards in order to obtain the overall composite response. [3,4] To validate such a simple approximation it is important to know the differences in mechanical behavior between oneparticle and multiparticle statistical models. Clustering, for example, can modify the load repartition between the phases, which leads in turn to the different values of calculated damage parameters.…”

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confidence: 99%

High-Temperature Deformation Behavior of PM 2000 Single Crystals

Heilmaier¹,

Wunder

Lee

et al. 2000

Adv. Eng. Mater.

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Oxide dispersion strengthened (ODS) superalloys are generally considered to be promising candidate materials for high-temperature applications up to 1300 C because of their favorable combination of a highly elongated, coarse grain structure with dispersion strengthening by incoherent, fine, and homogeneously distributed Y 2 O 3 particles. [1] In particular, the creep behavior of the recently developed bcc ironbased ODS superalloy, PM 2000, and its British counterpart, MA 956, reveals partly contradictory and surprising results, which have not yet been clarified in the literature. [2±10] As an example, Figure 1 shows the true stress±true strain curves obtained from tensile specimens of PM 2000 at 1000 C. The material used in this study exhibits a grain structure typical of ferritic ODS superalloys. [5][6][7][8] Within the gauge length it consists merely of four large elongated grains oriented in the hard <111> orientation. [10] Beyond the elastic limit, the point of maximum deformation resistance (or maximum flow stress) is passed before the 0.2 % yield stress (see the dashed line) is attained, indicating an absence of work hardening. Secondly, a drastic decrease of s with increasing e follows, which is even more pronounced for lower strain rates, é. Consequently, strain-to-failure values of less than 1 % have been reported in long-term creep experiments. [7] This dramatic reduction of creep strength is accompanied by localized crystallographic shear deformation covering only a small fraction of the total gauge length of the specimen, see the macrograph (Fig. 2) after a plastic elongation of 1.5 % at é = 4´10 ±7 s ±1

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confidence: 99%

High-Temperature Deformation Behavior of PM 2000 Single Crystals

Heilmaier¹,

Wunder

Lee

et al. 2000

Adv. Eng. Mater.

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Creep of crystalline materials: experimental basis, mechanisms and models

Blum

2001

Materials Science and Engineering: A

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Dependence of mechanical strength on grain structure in theγ' and oxide dispersion-strengthened nickelbase superalloy PM 3030

Nganbe¹,

Heilmaier²,

Schultz³

2005

MEKU

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Deformation of ODS-Fe-20 Cr-5 Al (PM 2000) Below the Threshold for Dislocation Glide Interpreted in Terms of Diffusive Flow

Cited by 3 publications

References 5 publications

High-Temperature Deformation Behavior of PM 2000 Single Crystals

High-Temperature Deformation Behavior of PM 2000 Single Crystals

Creep of crystalline materials: experimental basis, mechanisms and models

Dependence of mechanical strength on grain structure in theγ' and oxide dispersion-strengthened nickelbase superalloy PM 3030

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