High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy

He-yong QIN,Gang CHEN,Qiang ZHU,Chuan-jie WANG,Peng ZHANG

钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (6) : 551-556.

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钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (6) : 551-556.
Material

High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy

  • He-yong QIN1,Gang CHEN2,Qiang ZHU2,Chuan-jie WANG2,Peng ZHANG2
作者信息 +

High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy

  • He-yong QIN1,Gang CHEN2,Qiang ZHU2,Chuan-jie WANG2,Peng ZHANG2
Author information +
文章历史 +

摘要

High temperature low cycle fatigue tests on GH4742 superalloy were studied under the total strain-controlled conditions at 650 ℃. Combined with fatigue test data, fatigue properties of the alloy were analyzed. Fracture morphology and dislocation structure were observed by scanning electron microscopy and transmission electron microscopy. The results showed that fatigue life and fatigue resistance of GH4742 alloy decreased significantly with increasing total strain amplitude. The cyclic hardening, cyclic softening and cyclic stability phenomena of the alloy occurred during the low cycle fatigue process. The increasing total strain amplitude is conducive to the formation of γ′ phase. Fatigue crack propagation is controlled jointly by ductile and brittle fracture. Inhomogeneous deformation and deformation restricted in slip bands are the main reasons for the reduction of fatigue life of GH4742 alloy.

Abstract

High temperature low cycle fatigue tests on GH4742 superalloy were studied under the total strain-controlled conditions at 650 ℃. Combined with fatigue test data, fatigue properties of the alloy were analyzed. Fracture morphology and dislocation structure were observed by scanning electron microscopy and transmission electron microscopy. The results showed that fatigue life and fatigue resistance of GH4742 alloy decreased significantly with increasing total strain amplitude. The cyclic hardening, cyclic softening and cyclic stability phenomena of the alloy occurred during the low cycle fatigue process. The increasing total strain amplitude is conducive to the formation of γ′ phase. Fatigue crack propagation is controlled jointly by ductile and brittle fracture. Inhomogeneous deformation and deformation restricted in slip bands are the main reasons for the reduction of fatigue life of GH4742 alloy.

关键词

superalloy / low cycle fatigue / cyclic hardening / cyclic softening / fracture morphology / dislocation structure

Key words

superalloy / low cycle fatigue / cyclic hardening / cyclic softening / fracture morphology / dislocation structure

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张鹏, 秦鹤勇, 陈刚, . High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy[J]. 钢铁研究学报(英文版), 2015, 22(6): 551-556
ZHANG Peng, QIN He-Yong, CHEN Gang, et al. High Temperature Low Cycle Fatigue Behavior of GH4742 Alloy[J]. Journal of Iron and Steel Research International, 2015, 22(6): 551-556

参考文献

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基金

Major National Science and Technology Project of High-End CNC Machine Tools and Basic Manufacturing Equipments

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