1987 Fiscal Year Final Research Report Summary
Study on Deformation of Two Phase Materials at Elevated Temperatures
| Project/Area Number |
61550535
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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 |
金属材料(含表面処理・腐食防食)
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| Research Institution | Hiroshima University |
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Principal Investigator |
YANAGISAWA Osamu Faculty of Engineering,Hiroshima University, 工学部, 助教授 (50034393)
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| Co-Investigator(Kenkyū-buntansha) |
YANO Tetsuo Government Indnstrial Research Institute, 工業技術院・四国工業試験所, 助手 (80166561)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Spheroidal graphite cast iron / High temperature embrittlement / Intergranular fracture / Bainitic structure / Al-Al_3 Ni Eutectics / Residual stress / 画像処理 |
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| Research Abstract |
Stndy on the deformation of two kinds of two phase materials,spheroidal graphite cast iron and Al-Al Ni Entectics. Obtained results are as follow.
(1) Intergranular fracture at 673K is suppressed by making graphite volume fraction large and is not influenced by graphite nodule diameter.
(2) This embrittlement is suppressed by refining ferrite grain size.
(3) Relaxation rate of spheroidal graphite cast iron is much smaller than that of flaky graphite cast iron.
(4) Residual stress in the Al-Al_3 Ni entectic composites is affected by inter-fiber spacing. Deformation stress of the composites contains residual stresses which are influenced by the inter-fiber spacing.
(5) The numerical simulation which was carried ont to explain these behaviors was successful.
(6) Ductility of Al-Al_3 Ni base alloy produced by squeeze casting is improved by speroidizing annealing.
(7) In both castings and sintered materials,ductility is improved by making the axis ratio of equivalent ellipse of Al_3 Ni phase close to 1.
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