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Fatigue Properties of a Ni-Base Superalloy Treated by Laserolazing

Published online by Cambridge University Press:  26 February 2011


Jiang Xiaoping
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China
Hu Zhuang Qi
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China
Shih Changxu
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China
Zhu Guizeng
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China Northeast University of Technology, Shenyang, China
Meng Qinglin
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China Northeast University of Technology, Shenyang, China
Zhao Xiaode
Affiliation:
Institute of Metal Research, Academia Sinica, Shenyang, China Northeast University of Technology, Shenyang, China

Abstract

Fatigue properties of a wrought Ni-base superalloy treated by laserglazing and post heat treatments have been investigated. Tests have been run both by the rotating bend fatigue at 700°C and the vibration fatigue of turbine blades at room temperature. The results showed that the fatigue property of laserglazed specimens was obviously deteriorated because of resolution of γ′ phase and grain boundary carbide, interdendritic segregation of TiC and microcrack caused by thermal stress. However, suitable preheating and post heat treatment added before and after laserglazing can eliminate these defects and recover the fatigue life of this superalloy. Selected laser processing technology was applied to repairing blades rejected due to microcracks at trailing edge. The vibration fatigue life of blades repaired by laserglazing and post heat treatment was over two times as high as that of normal used blades with same service time.


Type
Articles
Copyright
Copyright © Materials Research Society 1987

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References

[1]. Moore, P., Kim, C. and Weinman, L.S., Laser in Metallurgy, edited by Mukherjee, K. and Mazumder, J. (TMS-AIME, New York, 1981) p. 259.Google Scholar
[2]. Greenwald, L.E., and Breinan, E.M. and Kear, B.H., Laser-Solid Interactions and Laser Processing, edited by Ferris, S.D., Leamy, H.J. and Poote, J.M. (AIP Conf. Proc. 50, 1979) p. 189.Google Scholar
[3]. Cell, M. and Leverant, G.R., Acta. Met. 16, 553 (1968).Google Scholar
[4]. Xiaoping, Jiang, Master Thesis, Northeast University of Technology, P.R.C., 1984 (in Chinese).Google Scholar
[5]. Zhentong, Gao, Test of Fatigue Properties, 1st ed. (National Defense Industry publisher of China, 1980), Chap. 3 and 7 (in Chinese).Google Scholar

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