期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.11.040
关键词
Low cycle fatigue; Cyclic stress/strain curve; Coffin-Manson plot; delta phase; Nickel-based alloy
类别
资金
- National Natural Science Foundations of China [51371082, 51322510]
- Shanghai Technology Innovation Program of SHEITC [CXY-2015-001]
- Fok Ying Tung Education Foundation
- Shanghai Pujiang Program
The effect of volume fraction of delta phase, which was changed through changing the heat treatment conditions, on the strain-controlled fatigue behavior of Nickel-based GH4169 alloys at room temperature was investigated. The delta phase had almost no effect on fatigue life at strain amplitude higher than 0.5%. However, the fatigue life increased with increasing volume fraction of (delta phase at the strain amplitude of 0.4%. The alloys with three different volume fractions of delta phase exhibited dual-slope Coffin-Manson relationships, which could be attributed to the changes in the deformation mode from twinning to slip bands as well as the crack initiation mode from transgranular to intergranular with increasing strain amplitude.
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