| Project/Area Number |
07650807
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Structural/Functional materials
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
OHTANI Hiroshi Tohoku Univ.Cnt.Interdisciplinary Res.Ass.Prof., 学際科学研究センター, 助教授 (70176923)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KAINUMA Ryosuke Tohoku Univ.Fac.Eng., Ass.Prof., 工学部, 助教授 (20202004)
ISHIDA Kiyohito Tohoku Univ.Fac.Eng., Professor, 工学部, 教授 (20151368)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Project Status |
Completed (Fiscal Year 1996)
|
| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
|
|---|
| Keywords | oxide / carbonitride / sulfide / steel |
|---|
| Research Abstract |
1.Calculation of phase equilibria between austenite and complex compounds
A thermodynamic model was presented to calculate the composition of austenite as well as that of complex compounds in the microalloyed steels containing Ti, V and Nb.Especially the phase separation of the carbonitrides were taken into account in the analysis. The effect of individual element was briefly summarized as follows : , (a)Ti addition to the microalloyed steels enhances the formation of Ti-rich nitrides mainly due to its extreme low solubility in austenite. (b)Complex addition of the elements bring the phase separation of the carbonitrides, and in almost cases the separation between NbC and VC or NbC and TiN is presented. This phenomena can be explained from the view points of the relative stability of binary compounds.
2.Effect of secondary precipitates on the morphology of MnS
In order to control the morphology of MnS formed by solidification in steels and its modification by alloying of Ti, O,C and N,the concentraion, amount of secondary precipitates (oxides, carbonitrides) were investigated, in relation with phase equilibria.
|
