| Project/Area Number |
62850017
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
機械材料工学
|
|---|
| Research Institution | TOHOKU UNIVERSITY |
|---|
Principal Investigator |
SHOJI Tetsuo TOHOKU UNIV., DEPT. ENGNG., PROFESSOR, 工学部, 教授 (80091700)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HASHIDA Toshiyuki TOHOKU UNIV. DEPT. ENGNG, LECTURER, 工学部, 講師 (40180814)
TANAKA Takashi IDEMITSU CO., DEPT. PROD., SUPERINTENDENT, 製造部, 主幹研究員
SAITO Kiyoshi TOSHIBA CO., HEAVY APPARATUS CEN., HEAD, 重電技術研究所, 主査研究員
SAITO Yoshihisa TOHOKU ELECTRIC., RES. CENTER, SENIOR, 応用技術研究所, 主幹研究員
OKU Tatsuo JAERI, DEPT. HIGH TEMP TECH., HEAD, 高温工学部, 室長 (40133988)
斉藤 喜久 東北電力, 応用技術研究所, 主査研究員
中島 甫 日本原子力研究所, 燃料材料工学部, 室長 (10101271)
|
|---|
| Project Period (FY) |
1987 – 1989
|
| Project Status |
Completed (Fiscal Year 1989)
|
| Budget Amount *help |
¥16,800,000 (Direct Cost: ¥16,800,000)
Fiscal Year 1989: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1988: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1987: ¥11,000,000 (Direct Cost: ¥11,000,000)
|
|---|
| Keywords | MATERIALS DEGRADATION / NONDESTRUCTIVE EVALUATION / ELECTROCHEMICAL TECHNIQUE / SOFTENING / EMBRITTLEMENT / IN-SITU MEASUREMENT / GELL ELECTRODE / DATABASE / アノード分極曲線 / 電極インピーダンス / オーステナイト系ステンレス鋼 / シグマ脆性 / クリープ損傷 / 冷間加工 / クロム・モリブテン鋼 / 軟化 / 小型ジェル電極 |
|---|
| Research Abstract |
A NEW EVALUATION PROCEDURE FOR DETECTION AND DIAGNOSIS OF MATERIALS DEGRADATION OF HEAT RESISTANT MATERIALS WAS DEVELOPED WHICH HAS BEEN REQUIRED TO BE DEVELOPED FOR ENSURING THE STRUCTURAL SAFETY AND INTEGRITY OF COMPONENTS USED FOR A LONG TERM IN SERVICE. THE BASIC MECHANISMS OF DAMAGE DETECTION IS APPLICATION OF ELECTROCHEMICAL TECHNIQUE SUCH AS ANODIC POLARIZATION MEASUREMENTS AND IMPEDANCE SPECTROSCOPY MEASUREMENT FOR EVALUATION OF MICROSTRUCTURAL CHANGES CAUSED DURING THE SERVICE TIME AT ELEVATED TEMPERATURE. THE MATERIALS USED IN THIS INVESTIGATION ARE AUSTENITIC STAINLESS STEELS, Cr-Mo-V STEELS AND Cr-Mo STEELS WHICH ARE COMMONLY USED AS BOILER SUPERHEATER, TURBINE ROTORS AND CASING, REACTOR OF CHEMICALPLANTS AND BOILER HEADER. THE RESULTS CAN BE SUMMARIZED AS FOLLOWS, 1. EMBRITTLEMENT AND REDUCTION OF CREEP RESISTANCE OF SUS 321 and 316 DUE TO SIGMA PHASE FORMATION AND CARBIDE PRECIPITATION CAN BE DETECTED BY POLARIZATION MEASUREMENT IN KOH SOLUTION. 2. A SOLUTION FOR DETECTION OF TEMPER EMBRITTLEMENT OF Cr- Mo- V STEELS IS DEVELOPED WITH A VERY HIGH SENSITIVITY RATHER THAN PICRIC ACID SOLUTION. 3. A DETECTION SOLUTION WAS DEVELOPED FOR SELECTIVE DETECTION OF M6C CARBIDES WHICH CAUSE THE VARIOUS DETERIORATION SUCH AS SOFTNING, CARBIDE EMBRITTLEMENT ETC. 4. DEVELOPMENT OF GELL ELECTRODE, SMALL ELECTOCHEMICAL CELL AND HANDY TYPE POTENTIOSTATT WERE ACHIEVED FOR THE IN-SITU MEASUREMENTS AT THE PLANTS. 5. DEVELOPMENT OF DATA BASE FOR THE SYSTEMATIC PROCEDURE TO DETECT THE VARIOUS TYPE OF DEGRADATION AND THEIR STANDARIZATION.
|
