| Project/Area Number |
59420040
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
金属加工(含鋳造)
|
|---|
| Research Institution | Osaka University. |
|---|
Principal Investigator |
KATO Kenzo Professor. Faculty of Engineering. Osaka University., 工学部, 教授 (60028925)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SAKAI Tetsuo Assistant. Faculty of Eng. Osaka Univ., 工学部, 助手 (80029298)
SAITO Yoshihiro Assistant Professor. Faculty of Eng. Osaka Univ., 工学部, 助教授 (20029101)
|
|---|
| Project Period (FY) |
1984 – 1986
|
| Project Status |
Completed (Fiscal Year 1986)
|
| Budget Amount *help |
¥33,300,000 (Direct Cost: ¥33,300,000)
Fiscal Year 1986: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1985: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1984: ¥23,300,000 (Direct Cost: ¥23,300,000)
|
|---|
| Keywords | Heavy reduction rolling / rolling temperature control system / Spray water cooling / Lubrication rolling / Ceramic roll / 熱間圧延 / 微細結晶粒 / 再結晶 / 集合組織 |
|---|
| Research Abstract |
It is very difficult to investigate how recovery or recrystallization proceeds during hot rolling of steel. In the present study, a unigue combination of high speed laboratory rolling mill and water cooling facility enables quenching the microstructure immediately after rolling. Inhomogeneity of equivalent strain and recrystallization are observed through the thickness of rolled specimens. A layer of finely recrystallized grains is formed at the position of maximum equivalent strain below the surface.
A new rolling temperature control system (multi nozzle water spray method) was established to get the precise microstructure of rolled materials. It is found that cooling velocity becomes 1300K/s and no distortion of rolled metal occur and uniform longitudinal temperature distribution is shown.
The result obtained in high speed high strain hot rolling of 18Cr-8Ni stainless steel is summarized as follows.
1) The shear deformation in rolled materials increases with heavy reduction rolling method in spite of good lubrication condition.
2) The fine grain micro structure(5-10 <micro> m) occurs in the surface layer of rolled material with heavy reduction rolling method.
3) Property of the rolled material in heavy reduction rolling equals to the steel plate produced with cold rolling and annealing.
4) Crystallographic orientation measured with X-ray becomes random in the the fully recrystallized rolled materials.
5) Possibility of using ceramic roll in high speed high strain hot rolling was investigated in this study.
|
