HIGH CYCLE FATIGUE PROPERTIES OF NICKEL-BASE ALLOY 718
来源期刊：Acta Metallurgica Sinica2004年第4期
论文作者：K.Kobayashi K.Yamaguchi M.Kimura M.Hayakawa
Key words：aerospace material; fatigue; high temperature; internal fracture; facet;
Abstract: The fatigue properties of nickel-base Alloy 718 with fine- and grain-coarse grains were investigated. In the fine-grain alloy, the fatigue strength normalized by the tensile strengtn was 0.51 at 107 cycles. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103to 105 cycles are the same for both alloys. The fracture appearances fatigued at around 106 cycles showed internal fractures originating from the flat facets of austenite grains for both alloys. The difference in fatigue strength at 107 cycles between the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated.
K.Kobayashi1，K.Yamaguchi1，M.Kimura1，M.Hayakawa1
(1.National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan)
Abstract:The fatigue properties of nickel-base Alloy 718 with fine- and grain-coarse grains were investigated. In the fine-grain alloy, the fatigue strength normalized by the tensile strengtn was 0.51 at 107 cycles. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103to 105 cycles are the same for both alloys. The fracture appearances fatigued at around 106 cycles showed internal fractures originating from the flat facets of austenite grains for both alloys. The difference in fatigue strength at 107 cycles between the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated.
Key words:aerospace material; fatigue; high temperature; internal fracture; facet;
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