Dependence of stacking faults in gamma matrix on low-cycle fatigue behavior of a Ni-based single-crystal superalloy at elevated temperature

2018 ◽  
Vol 152 ◽  
pp. 94-97 ◽  
Author(s):  
X.G. Wang ◽  
J.L. Liu ◽  
J.D. Liu ◽  
Y.Z. Zhou ◽  
J.G. Li ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Stacking Faults ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue

Low Cycle Fatigue Characteristics of a Ni-Based Single Crystal Superalloy CMSX-4 at Elevated Temperature

2019 ◽  
Vol 36 (3) ◽  
pp. 271-279
Author(s):  
Jae Gu Choi ◽  
Chang-Sung Seok ◽  
Sung Uk Wee ◽  
Eui-Suck Chung ◽  
Byoung-Gwan Yun ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Fatigue Characteristics

scholarly journals Effect of Local Recrystallized Grains on the Low Cycle Fatigue Behavior of a Nickel-Based Single Crystal Superalloy

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 312 ◽  
Author(s):  
Xianfeng Ma ◽  
Jishen Jiang ◽  
Wenjie Zhang ◽  
Hui-ji Shi ◽  
Jialin Gu
Keyword(s):  
Crack Propagation ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Initiation Site ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Intergranular Cracking

This paper aims to understand the effect of local recrystallization (RX) on the low cycle fatigue fracture of a turbine-blade single crystal nickel-based superalloy. The fatigue life of the single crystal superalloy was evidently decreased by local recrystallization. In single crystal specimens, casting porosity is the preferential fatigue crack initiation site, which is followed by crystallographic crack propagation along one or several octahedral slip planes. For all RX specimens, fatigue cracks preferred to initiate from local recrystallized grains and propagated through the recrystallized grains in a transgranular manner, followed by crystallographic crack propagation in the substrate single crystal superalloy. Moreover, fatigue tests indicated that locally recrystallized specimens exhibited temperature dependent fracture modes, i.e., transgranular cracking dominated at 550 °C, whereas intergranular cracking was preferred at 850 °C. Evident oxidation of fracture surfaces and strength degradation of grain boundaries at 850 °C was evidenced by scanning electronic microscopic observations. The present study emphasized the need to evaluate the effect of recrystallization according to the working conditions of turbine components, i.e., the local temperature.

Low cycle fatigue behavior of nickel-based superalloy GH4145/SQ at elevated temperature

2004 ◽  
Vol 373 (1-2) ◽  
pp. 54-64 ◽  
Author(s):  
Duyi Ye ◽  
Dehai Ping ◽  
Zhenlin Wang ◽  
Haohao Xu ◽  
Xiaoyu Mei ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Nickel Based Superalloy

Cyclic Softening Effect on Design Margin of JLF-1 Steel

2013 ◽  
Author(s):  
Huailin Li
Keyword(s):  
Elevated Temperature ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cyclic Softening ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Softening Effect ◽  
As Stress ◽  
Supercritical Water Cooled Reactor ◽  
Design Margin

A reduced-activation ferritic/martensitic (RAF/M) steel, JLF-1, is considered as one of the candidate structure material of the fusion reactors and supercritical water-cooled reactor (SCWR). Low cycle fatigue properties of JLF-1 steel at elevated temperature are the design base to provide adequate design margin against postulated mechanism that could experience during its design life, such as stress range, plastic deformation, and cyclic softening etc. However, the reduction in design margin is significant when the cyclic softening happens in cyclic deformation at RT, 673K, 873K. Thus, for the application as the structural materials, it is necessary to evaluate low cycle fatigue behavior and cyclic softening of JLF-1 steel at elevated temperature since those properties of material at elevated temperature are the key issue for design.

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