HIGHTEMPERATURE LOWCYCLE FATIGUE BEHAVIOR OF NICKELBASED SUPERALLOY GH4049

Acta Metallurgica Sinica (English Letters) ›› 1999, Vol. 12 ›› Issue (1): 12-15.

• Research paper • Previous Articles Next Articles

HIGHTEMPERATURE LOWCYCLE FATIGUE BEHAVIOR OF NICKELBASED SUPERALLOY GH4049

Author L.J. Chen1,2), G. Yao1), Z.G. Wang1) and J.F. Tian1) 1) State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China2) Department of Metallic Material Engineering, Shenyang Polytechnic University, Shenyang 110021, China Manuscript received 18 October 1998

Received:1999-02-25 Revised:1999-02-25 Online:1999-02-25 Published:2009-10-10

Abstract

Abstract: The cyclic stress response and lowcycle fatigue life for wrought nickelbased superalloy GH4049 were investigated in the temperature range from 500 to 800 The relationship between the strain amplitude and the number of stress reversals was given. The behavior of cyclic hardening was observed for higher strain amplitudes at all testing temperatures and the lowcycle fatigue life generally decreased with increasing testing temperature for the same strain range. In addition, fracture surfaces of the fatigued samples were examined by using a scanning electron microscope.

Key words: superalloy, low cycle fatigue, fatigue life

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HIGHTEMPERATURE LOWCYCLE FATIGUE BEHAVIOR OF NICKELBASED SUPERALLOY GH4049

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