The Abnormal Grain Growth of P/M Nickel-Base Superalloy: Strain Storage and CSL Boundaries

2014 ◽  
Vol 1064 ◽  
pp. 49-54 ◽  
Author(s):  
Shuang Fang ◽  
Yun Peng Dong ◽  
Shu Yun Wang
Keyword(s):  
Strain Rate ◽  
Grain Growth ◽  
Deformation Temperature ◽  
True Strain ◽  
Compressive Force ◽  
Constant Strain Rate ◽  
Nickel Base Superalloy ◽  
Strain Rates ◽  
Nickel Base ◽  
Base Superalloy

The Nickel-base superalloy samples were prepared by the isothermal forging in different strain rates at 1070°C. The isothermal deformation tests were carried out at constant strain rate in a vacuum environment using the Thermecmastor (Fuji Electronic Industrial Co., Japan) with a capacity of 30 ton compressive force. All the samples were deformed to a true strain of 1.04 at deformation temperature 1070°C and strain rate 0.001s-1~0.1s-1 respectively. The result is The deformation strain rate determine the position and domain of AGG and the temperature determine the severity of AGG by deformation temperature and temperature rise. The most serious region of AGG is related to the specific CSL boundaries. The fraction of Ʃ3 boundary reaches the peak point value and fraction of Ʃ7 boundary reaches the valley point value in all the samples with different strain rates. The most serious region of AGG is also related to the residual strain. In the most serious region of AGG, more dislocation is used to prefer grain growth to recrystallization, which can refine grain.

The Effect of Isothermal Deformation Parameters on Abnormal Grain Growth of P/M Nickel-Base Superalloy

2015 ◽  
Vol 710 ◽  
pp. 37-43 ◽  
Author(s):  
Shuang Fang ◽  
Min Cong Zhang ◽  
Yun Peng Dong ◽  
Shu Yun Wang
Keyword(s):  
Strain Rate ◽  
Grain Growth ◽  
Deformation Temperature ◽  
True Strain ◽  
Constant Strain Rate ◽  
Abnormal Grain Growth ◽  
Nickel Base Superalloy ◽  
Isothermal Deformation ◽  
Nickel Base ◽  
Base Superalloy

The samples with a length of 50mm and cross section area of 20mm2 were machined from extruded P/M Nickel-base superalloy billet and the isothermal deformation tests were carried out at constant strain rate in a vacuum environment using the Thermecmastor. All the samples were deformed to a true strain of 1.04 at deformation temperature 1070°C and 1100°C and strain rate 0.001s-1~1s-1 respectively. The result is the deformation strain rate determine the position and the deformation temperature determine the severity of abnormal grain growth (AGG). The initial grain size and dislocation density is not the only reason to AGG. The AGG is related the recrystallization nucleation process is inhibited in the heat treatment. The AGG region usually has more low energy and low migration rate boundary than other regions.

Hot Deformation Behavior and Processing Map of a Nickel-Base Superalloy GH4169

2013 ◽  
Vol 834-836 ◽  
pp. 432-436 ◽  
Author(s):  
Fu Wei Kang ◽  
Xue Min Zhang ◽  
Jian Fei Sun ◽  
Jun Ling Zhao
Keyword(s):  
Strain Rate ◽  
Power Dissipation ◽  
Hot Deformation ◽  
True Strain ◽  
Stability Domain ◽  
Nickel Base Superalloy ◽  
Peak Efficiency ◽  
True Strain Rate ◽  
Nickel Base ◽  
Base Superalloy

The hot deformation behaviors of the nickel-base superalloy GH4169 have been studied by isothermal constant true strain rate compression testing at 950°C-1150°C, 0.01s-1-10s-1and the height reduction 50%. The processing maps of GH4169 alloy have been constructed at different strains on the basis of testing data using a dynamic materials modeling. The maps exhibited two domains: the first at 950°C - 1100°C and strain rate higher than 0.1s-1, with a peak efficiency of power dissipation of 0.1, and the second at 950°C-1100°C and strain rate lower than 1s-1, with a peak efficiency of power dissipation of 0.4 and the strain rate of 0.01s-1. On the basis of microstructure observations, the first exhibits adiabatic shear bands, which called instability domain, the second represents fine recrystallized grain structures, which called stability domain. The optimal hot-working parameters are at 1050°C, 0.01s-1.

scholarly journals Comparison in Deformation Behavior, Microstructure, and Failure Mechanism of Nickel Base Alloy 625 under Two Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2652
Author(s):  
Meng Liu ◽  
Quanyi Wang ◽  
Yifan Cai ◽  
Dong Lu ◽  
Tianjian Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Base Alloy ◽  
Inconel 625 ◽  
Tensile Fracture ◽  
Nickel Base Superalloy ◽  
Strain Rates ◽  
Tensile Fracture Surface ◽  
Nickel Base

Tensile deformation behavior and microstructure of nickel-base superalloy Inconel 625 are investigated under different strain rates of 5 × 10−4 s−1 and 5 × 10−5 s−1. According to the experimental results, yield strength and ultimate tensile strength of the alloy increase with the increase in strain rate in room temperature. Microstructure results indicate that the size of dimples is smaller in the tensile fracture surface at low strain rate than the high strain rate, and the number of dimples is also related to the strain rates and twins appear earlier in the specimens with higher strain rates. Apart from Hollomon and Ludwik functions, a new formula considering the variation trend of strength in different deformation stages is deduced and introduced, which fit closer to the tensile curves of the 625 alloy used in the present work at both strain rates. Furthermore, the Schmid factors of tensile samples under two strain rates are calculated and discussed. In the end, typical work hardening behavior resulting from the dislocations slip behavior under different strain rates is observed, and a shearing phenomenon of slip lines cross through the δ precipitates due to the movement of dislocations is also be note.

scholarly journals Short-term creep behavior of an additive manufactured non-weldable Nickel-base superalloy evaluated by slow strain rate testing

2019 ◽  
Vol 179 ◽  
pp. 142-157 ◽  
Author(s):  
Jinghao Xu ◽  
Hans Gruber ◽  
Dunyong Deng ◽  
Ru Lin Peng ◽  
Johan J. Moverare
Keyword(s):  
Strain Rate ◽  
Creep Behavior ◽  
Nickel Base Superalloy ◽  
Short Term ◽  
Slow Strain Rate Testing ◽  
Rate Testing ◽  
Nickel Base ◽  
Term Creep ◽  
Base Superalloy ◽  
Short Term Creep

Modified Johnson-Cook description of wide temperature and strain rate measurements made on a nickel-base superalloy

2016 ◽  
Vol 34 (3) ◽  
pp. 157-165 ◽  
Author(s):  
Jianjun Wang ◽  
Wei-Guo Guo ◽  
Penghui Li ◽  
Ping Zhou
Keyword(s):  
Strain Rate ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Grain growth during sintering of a nickel-base superalloy

1980 ◽  
Vol 14 (6) ◽  
pp. 577-581 ◽  
Author(s):  
R. Angers ◽  
K. Hajmrle
Keyword(s):  
Grain Growth ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Investigation on Work Hardening Behavior of Nickel-Base Superalloy during Hot Working Process by EBSD

2014 ◽  
Vol 1077 ◽  
pp. 50-55
Author(s):  
Shuang Fang ◽  
Min Cong Zhang ◽  
Qiu Ying Yu ◽  
Shu Yun Wang ◽  
Chun Xiao Cao
Keyword(s):  
Slip System ◽  
True Strain ◽  
Strain Curve ◽  
True Stress ◽  
Strain Level ◽  
Nickel Base Superalloy ◽  
Hardening Behavior ◽  
Nickel Base ◽  
Base Superalloy ◽  
Peak Value

The Nickel-base superalloy samples were prepared by the isothermal forging in strain rate 1s-1 at deformation temperature 1070°C with different strain levels. The EBSD was carried out in order to investigate the microstructural changes that took place due to strain level. The result is the samples has no apparent dynamic recrystallization behavior in hot deformation in 1s-1 at 1070°C. The true stress-true strain curve has two peak values in the strain level of 20% and 60%, and one valley value in the strain level of 50%. The first peak value is result in the activation of slip system and the beginning of recrystallization and the second peak value of the true stress-true strain curve is result in the inhibition of activation of slip system and grain growth by the dislocation density. The work hardening behavior of P/M Nickel-base superalloy may be related to the size ratio of γ’ phase with grain size.

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