HIGH TEMPERATURE FATIGUE BEHAVIOUR OF A DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY

Abstract

Abstract: The high temperature high cycle fatigue behaviour of a directionally solidified Co-base superalloy was investigated. The alloy has saperior fatigue resistance at 900℃ and its fatigue strength is up to 295MPa. Its σ-Nf curve is characterized by three distinct zones. The stronger dependence of Nf on or in the high .and low stress zones results from multiple fatigue crock initiation sites produced by high stress and oxidation effect in a prolonged exposure, respectively.

Key words: directional solidification, Co-base superalloy, fatigue, fracture

W. H. JIANG; X.D. YAO; H.R. GUAN; and Z. Q. HU(Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China)(Shenyang Polytechnic University, Shenyang 110023, China). HIGH TEMPERATURE FATIGUE BEHAVIOUR OF A DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY[J]. Acta Metallurgica Sinica (English Letters), 1998, 11(2): 111-115.

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HIGH TEMPERATURE FATIGUE BEHAVIOUR OF A DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY

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