Interphase-boundary structures and mechanical properties of two-phase ( / ) stainless steel bicrystals
| Project/Area Number |
62550475
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Kyoto University |
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Principal Investigator |
MIURA Sei (1988) Faculty of Engineering, Kyoto University, Professor, 工学部, 教授 (00066169)
橋本 敏 (1987) 京都大学, 工学部, 助教授 (50127122)
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| Co-Investigator(Kenkyū-buntansha) |
三浦 精 京都大学, 工学部, 教授 (00066169)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
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| Keywords | Two-phase stainless steel / Multi-phase material / Interface / Bicrystal / Kurdjumov-Sachs orientation relationship / Diffusion bonding / Mechanical property / 異相界面 / Kurdjunov-Sachs関係 / 異相双結晶 / 拡散相変態 / γ / αステンレス鋼双結晶 / FCC / BCC相界面構造 / 拡散誘起双晶 |
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| Research Abstract |
The morphology of two-phase ( / ) stainless steel couples, starting from Fe- 30Cr( -phase) and Fe-15Cr-15Ni( -phase) alloys produced by a solid-solid diffusion method has been investigated. Macroscopic units made of single crystals of the - and - phases (two-phase bicrystals) could be obtained. Interphase boundaries between a parent -phase and a transformed -phase have been found to be essentially planar and no special structual defects have been detected, excepting a so-called diffusion-induced twin faults grown often in the -phase due to the inevitable concentration gradient adjacent to the interphase boundary.
It is found that the transformed ( _n)-phase generally inherits the crystallographic orien-tation of the original ( _o)-phase in a similar manner to "Grain growth", when the initial bonding orientation relation is arbitrary. However, if the bonding orientation relation is set to be a near Kurjumov-Sachs relation which is a well-known preferential orientation relation between precipitate and matrix in this system, nucleation of the phase transformation ( ) occurs and the resulting orientation relations become closer to the preferential one. These facts mean that the critical condition for the occurrence of the "nucleation" may be attributable to the interfacial erergy criterion on the ( / )-interphase boundary and the grain-boundary between the _o - and _n - phases.
Study to reveal the relationship between structures and sliding behavior of the interphase boundary in two-phase ( / ) stainless steel bicrystals are in progress.
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Report
(3 results)
Research Products
(6 results)
