Effect of Aging Temperature on the Fatigue Properties of Shot-peened Single Crystal Superalloy at IntermediateTemperature

2021 ◽  
pp. 106675
Author(s):  
Wang Xin ◽  
Ma Shicheng ◽  
Hu Dianying ◽  
XU Chunling ◽  
Luo Xuekun ◽  
...  
Keyword(s):  
Single Crystal ◽  
Aging Temperature ◽  
Single Crystal Superalloy ◽  
Fatigue Properties

scholarly journals Low-Cycle Fatigue Behaviour of a Ni-Based Single-Crystal Superalloy

2014 ◽  
Vol 891-892 ◽  
pp. 416-421 ◽  
Author(s):  
Mikael Segersäll ◽  
Johan Moverare ◽  
Daniel Leidermark ◽  
Kjell Simonsson
Keyword(s):  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Strain Range ◽  
Cyclic Hardening ◽  
Fatigue Behaviour ◽  
Single Crystal Superalloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Stress Strain ◽  
Tension Compression Asymmetry

In this study, low-cycle fatigue (LCF) tests at 500 °C in the <001>, <011> and <111> directions have been performed for the Ni-based single-crystal superalloy MD2. All tests were carried out in strain control with Rε=-1. The <001> direction has the lowest stiffness of the three directions and also shows the best fatigue properties in this study followed by the <011> and <111> directions, respectively. It is well recognised that Ni-based single-crystal superalloys show a tension/compression asymmetry in yield strength and this study shows that a tension/compression asymmetry also is prevalent during LCF conditions. At mid-life, the <001> direction generally has a higher stress in tension than in compression, while the opposite is true for the <011> direction. For the <111> direction the asymmetry is found to be strain range dependent. The <011> and <111> directions show a cyclic hardening behaviour when comparing cyclic stress-strain curves with monotonic stress-strain curves. In addition, the <011> and <111> directions show a serrated yielding behaviour for a number of cycles while the yielding of the <001> direction is more stable.

Effect of aging temperature on the secondary γ′ precipitation in a model Ni based single crystal superalloy

2020 ◽  
Vol 836 ◽  
pp. 155486 ◽  
Author(s):  
Chuang He ◽  
Lin Liu ◽  
Taiwen Huang ◽  
Wenchao Yang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Aging Temperature ◽  
Single Crystal Superalloy

Influence of Heat Treatment Temperature on the Microstructures and High Cycle Fatigue Properties of DD6 Single Crystal Superalloy

2017 ◽  
Vol 898 ◽  
pp. 480-486
Author(s):  
Hong Ji Xie ◽  
Jia Rong Li ◽  
Xiao Dai Yue
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Heat Treatment Temperature ◽  
High Cycle Fatigue ◽  
Treatment Temperature ◽  
Single Crystal Superalloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Standard Heat Treatment ◽  
Standard Heat

The effect of heat treatment temperature on the microstructure and the high cycle fatigue property of DD6 single crystal superalloy was investigated. After standard heat treatment, the alloy was hold at 1200°C and 1300°C for 1h respectively, and then air-cooled. The results showed that after heat treatment at 1200°C for 1h, the size of γ′ particles became slightly larger and quite unevenly, at the same time, the serrated γ/γ′ interface appeared. After heat treatment at 1300°C for 1h, the small irregular γ′ particles re-precipitated. In addition, a small number of fine secondary γ′ particles were also observed in the matrix channel of the alloy after primary aging of 1200°C/1h and 1300°C/1h. The high cycle fatigue properties of the alloy by standard heat treatment were higher than that of the alloy by 1200°C/1h and 1300°C/1h, but the decreased degree of 1200°C/1h was much bigger than that of 1300°C/1h. Analysis on fracture surfaces of the alloy at 800°C demonstrated a quasi-cleavage mode.

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