Stacking Faults and Transformation of γ' Metastable Precipitates in an Fe-29Ni-22Co-4Nb-2Cr-1Ti-0.5Al-0.5Si Alloy
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概要
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In this study, we investigate an Fe-29Ni-22Co-4Nb-2Cr-1Ti-0.5Al-0.5Si heat resistant alloy (refer to herein as alloy 929C), in which the γ′ phase is the precipitation-strengthening phase. The specimens of alloy 929C are solid-solution heat treated and aged within a temperature range of 993 to 1 073 K for up to 1 440 ks. The morphological and structural changes of the precipitates in the alloy are analyzed by transmission electron microscopic observation. Internal-fringe contrast, which suggests the existence of stacking faults on the {111}γ′ plane, is found in many of the large γ′ precipitates formed in the specimens at the latter stage of aging at temperatures above 1 033 K. The metastable γ′ precipitates, of which some have stacking faults, are gradually transformed into a stable η phase during aging. The effects of stacking faults introduced by cold-rolling into the γ′ particles on the formation of η phase are studied by subsequent annealing heat treatments. The selected-area electron diffraction (SAED) patterns of the cold-rolled and annealed particles show that the metastable γ′ precipitates with stacking faults are transformed intensively into a stable η phase. In this paper, we discuss in detail the basis of these morphological and structural changes of the precipitates in heat-resistant alloys.
- 社団法人 日本鉄鋼協会の論文
- 2004-01-15
著者
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Saji Shigeoki
Toyama University
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KUSABIRAKI Kiyoshi
Center for Cooperative Research, University of Toyama
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AMANO Takeshi
Department of System Engineering of Materials and Life Science, Toyama University
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MOTO Sanshi
Department of System Engineering of Materials and Life Science, Toyama University
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Kusabiraki Kiyoshi
Center For Cooperative Research Toyama Univ.
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Moto Sanshi
Department Of System Engineering Of Materials And Life Science Toyama University
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Amano Takeshi
Department Of System Engineering Of Materials And Life Science Toyama University
関連論文
- High-temperature Oxidation Behavior and Scale Morphology of Si-containing Steels
- Stacking Faults and Transformation of γ' Metastable Precipitates in an Fe-29Ni-22Co-4Nb-2Cr-1Ti-0.5Al-0.5Si Alloy
- Oxidation Behavior of Fe-36% Ni Bicrystals in Air
- Oxidation behavior and scale morphology of silicon containing steels