Analysis of damage behavior based on EBSD method and the law of fracture life under creep–fatigue conditions for the polycrystalline nickel-base superalloy

2015 ◽  
Vol 9 (1) ◽  
pp. 95-109
Author(s):  
Daisuke Kobayashi ◽  
Masamichi Miyabe ◽  
Masahiro Achiwa ◽  
Ruji Sugiura
Keyword(s):  
Nickel Base Superalloy ◽  
Polycrystalline Nickel ◽  
Damage Behavior ◽  
Creep Fatigue ◽  
The Law ◽  
Behavior Based ◽  
Nickel Base ◽  
Ebsd Method ◽  
Base Superalloy

scholarly journals Grain Refinement of a Powder Nickel-Base Superalloy Using Hot Deformation and Slow-Cooling

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1978 ◽  
Author(s):  
Xianqiang Fan ◽  
Zhipeng Guo ◽  
Xiaofeng Wang ◽  
Jie Yang ◽  
Jinwen Zou
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Hot Deformation ◽  
Nickel Base Superalloy ◽  
Polycrystalline Nickel ◽  
Slow Cooling ◽  
Homogeneous Microstructure ◽  
Average Grain Size ◽  
Nickel Base ◽  
Base Superalloy

A pre-hot-deformation process was applied for a polycrystalline nickel-base superalloy to active deformation twins and dislocations, and subsequent slow cooling treatment was used to achieve grain refinement and microstructure homogenization. The microstructural evolution of the alloy was investigated, and the corresponding underlying mechanism was discussed. It was found that twinning mainly occurred in large grains during pre-hot-deformation owing to the stress concentration surrounding the large grains. High density dislocations were found in large grains, and the dislocation density increased approaching the grain boundary. The average grain size was refined from 30 μm to 13 μm after slow cooling with a standard deviation of grain size decreasing from 10.8 to 2.8, indicating a homogeneous microstructure. The grain refinement and microstructure homogenization during cooling process could be achieved via (i) static recrystallization (SRX), (ii) interaction of twin tips and γ’ precipitates, and (iii) grain coarsening hindered by γ’ precipitates in grain boundaries.

scholarly journals Damage Evaluation Based on EBSD Method for Nickel-Base Superalloy Notched Specimen Under Creep and/or Fatigue Conditions

2015 ◽  
Vol 64 (2) ◽  
pp. 113-119
Author(s):  
Daisuke KOBAYASHI ◽  
Masamichi MIYABE ◽  
Masahiro ACHIWA ◽  
Ruji SUGIURA ◽  
A. Toshimitsu. YOKOBORI Jr.
Keyword(s):  
Nickel Base Superalloy ◽  
Damage Evaluation ◽  
Notched Specimen ◽  
Nickel Base ◽  
Ebsd Method ◽  
Base Superalloy
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