1993 Fiscal Year Final Research Report Summary
Study on improvement of high temperature strength in oxidation environment of intermetallic compound and Nickel-base superalloys by electric-discharge anti-oxidation surface treatment
| Project/Area Number |
04650097
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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 |
材料力学
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| Research Institution | Toyota Technological Institute |
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Principal Investigator |
IINO Yutaka Toyota Technological Institute Department of Engineering Professor, 工学部, 教授 (20005367)
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| Co-Investigator(Kenkyū-buntansha) |
TSUNEKAWA Yoshiki Toyota Technological Institute Department of Engineering Professor, 工学部, 教授 (50148350)
MOHRI Naotake Toyota Technological Institute Department of Engineering Professor, 工学部, 教授 (90126186)
SAITO Nagao Toyota Technological Institute Department of Engineering Professor, 工学部, 教授 (60148343)
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| Project Period (FY) |
1992 – 1993
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| Keywords | high temperature oxidation / intermetallic compound / Ni-base superalloy / electric-discharge-machining / surface modification / low cycle fatigue / creep |
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| Research Abstract |
To improve both oxidation resistance and mechanical properties such as low cycle fatigue crack initiation life and creep crack initiation time of stress concentration part, electric-discharge surface modification technique was used, by which intermetallic compound TiAl and Nickel-base superalloys 713LC and 738LC were electric-discharged using NiCrAlY electrode. Oxidation test, high temperature low cycle fatigue test and creep test were carried out. The modified surface of TiAl have many microcracks and the the surface-modification test was interruptted. Oxidation resistance of 713LC and 738LC in ranged 900-1000ﾟC was improved significantly by this technique. Low cycle fatigue crack initiation life at 800ﾟC of 738LC notched compact tension specimen was comparable with non-treated one. Creep crack initiation time at 900ﾟC of the CT specimen was improved with less oxidation, while the oxide film of the non-treated one spalled much.
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