<I>In-situ</I> Observation of Strain-Induced γ→ε→α′ and γ→α′ Martensitic Transformations in Fe–Cr–Ni Alloys
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- Fujita Hiroshi
- Research Institute for Science and Technology, Kinki University
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- Katayama Tetsuya
- Graduate Student, Faculty of Engineering, Osaka University
書誌事項
- タイトル別名
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- <I>In-situ</I> Observation of Strain-Induced γ→ε→α′ and γ→α′ Martensitic Transformations in Fe–Cr–Ni Alloys
- In-situ observation of strain-induced γ→ ε→ α′ and γ→ α′ martensitic transformations in Fe–Cr–Ni alloys
- In-situ observation of strain-induced γ→ε→α' and γ→α' martensitic transformations in Fe-Cr-Ni alloys
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説明
Strain-induced γ→ε→α′ and γ→α′ martensitic transformations in Fe–Cr–Ni alloys have been investigated by in-situ deformation with a high voltage electron microscope. The results obtained are summarized as follows:<BR>[A] γ→ε→α′ transformation: (1) Two sets of ε-crystals are formed along the primary and the conjugate slip planes in γ-crystals oriented for multiple slip systems. Fine α′-crystals are frequently formed at the intersections between these ε-crystals. (2) In γ-crystals oriented for a single slip system α′-crystals are also formed. In this case, cross-slip accompanying a stair-rod dislocation frequently occurs in local regions, and stacking faults corresponding to the secondary shear displacement are induced to form α′-crystals. (3) These α′-crystals grow to make coalescence with each other, and large α′-crystals are formed.<BR>[B] γ→α′ martensitic transformation: (1) γ→α′ transformation also occurs by “the double shear mechanism”. (2) Formation processes of α′-crystals are classified into slow “Schiebung” type and rapid “Umklapp” type. The former is observed in γ-grains oriented for a single slip system, and the latter in those oriented for multiple slip systems or in work-hardened γ-grains. (3) In both cases, γ-twins are always well formed prior to the formation of α′-crystals, and the secondary shear displacement is initiated at the interface of these γ-twins. (4) Each α′-crystal grows easily along the γ-twin plane.<BR>Nucleation and growth mechanisms of α′-crystals in these transformations are discussed on the basis of the experimental results.
収録刊行物
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- Materials Transactions, JIM
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Materials Transactions, JIM 33 (3), 243-252, 1992
社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679223100672
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- NII論文ID
- 130003556051
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- COI
- 1:CAS:528:DyaK38XltFGktLw%3D
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- ISSN
- 2432471X
- 09161821
- http://id.crossref.org/issn/09161821
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
