Characterization of hot compression behavior of a new HIPed nickel-based P/M superalloy using processing maps

He, Guoai; Liu, Feng; Si, Jiayong; Yang, Chunli; Jiang, Liang

doi:10.1016/j.matdes.2015.08.035

Cited by 57 publications

(20 citation statements)

References 42 publications

(56 reference statements)

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“…Therefore, in these cases, DRX is the main mechanism for the hot deformation. In Figure 7e, the value of lnZ is the smallest with the deformation temperature at 490 • C and strain rate at 0.01 s −1 , which leads to a substantially increased DRX and is consistent with the findings in previous studies [39][40][41]. DRX is beneficial for the hot deformation process, which provides a stable flow and results in a good processability.…”

Section: Microstructure Analysissupporting

confidence: 90%

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

et al. 2019

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The hot deformation behavior of a new Al–Mn–Sc alloy was investigated by hot compression conducted at temperatures from 330 to 490 °C and strain rates from 0.01 to 10 s−1. The hot deformation behavior and microstructure of the alloy were significantly affected by the deformation temperatures and strain rates. The peak flow stress decreased with increasing deformation temperatures and decreasing strain rates. According to the hot deformation behavior, the constitutive equation was established to describe the steady flow stress, and a hot processing map at 0.4 strain was obtained based on the dynamic material model and the Prasad instability standard, which can be used to evaluate the hot workability of the alloy. The developed hot processing diagram showed that the instability was more likely to occur in the higher Zener–Hollomon parameter region, and the optimal processing range was determined as 420–475 °C and 0.01–0.022 s−1, in which a stable flow and a higher power dissipation were achieved.

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Section: Microstructure Analysissupporting

confidence: 90%

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

et al. 2019

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“…During hot plastic deformation, the relationship among the flow stress, strain rate and deformation temperature can be described by a hyperbolic sine law [18]: However, the influence of processing parameters, such as deformation temperature and strain rate, on the discontinuous yielding was not clearly understood. For the present titanium alloy, the yield drop appeared most pronouncedly at 950 • C and reduced gradually with further increase of deformation temperature, as shown in Figure 3b.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…During hot plastic deformation, the relationship among the flow stress, strain rate and deformation temperature can be described by a hyperbolic sine law [18]:…”

Section: Kinetic Analysismentioning

confidence: 99%

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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Abstract:The isothermal compression experiment of as-rolled Ti-55 alloy was carried out on a Gleeble-3800 thermal simulation test machine at the deformation temperature range of 700-1050 • C and strain rate range of 0.001-1 s −1 . The hot deformation behavior and the microstructure evolution were analyzed during thermal compression. The results show that the apparent activation energy Q in α + β dual-phase region and β single-phase region were calculated to be 453.00 KJ/mol and 279.88 KJ/mol, respectively. The deformation softening mechanism was mainly controlled by dynamic recrystallization of α phase and dynamic recovery of β phase. Discontinuous yielding behavior mainly occurred in β phase region, which weakened gradually with the increase of deformation temperature (>990 • C) and strain rate (0.01-1 s −1 ) in β phase region. The processing map derived from Murty's criterion was more accurate in predicting the hot workability than that derived from Prasad's criterion. The optimized hot working window was 850-975 • C/0.001-1 s −1 , in which sufficient dynamic recrystallization occurred and α + β-transus microstructure was obtained. When deformed at higher temperature (≥1000 • C), coarsened lath-shape β-transus microstructure was formed, while deformed at lower temperature (≤825 • C) and higher strain rate (≥0.1 s −1 ), the dynamic recrystallization was not sufficient, thus flow instability appeared because of shear cracking.

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“…Hot forging is an essential process when forming a turbine disk as to obtain favorable microstructure with fine and uniform grains as well as defect‐free component. He et al investigated the effects of deformation conditions on microstructure evolution and found that the strain rate, deformation temperature, and excursion strain playing the primary roles in affecting the formability and qualities of forged component. Cracking, including surface cracking, internal cracking, and peripheral cracking, were among the common defects to reject the forged parts .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

Liu

Huang

et al. 2016

Adv Eng Mater

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Hot compression tests on a newly designed hot extrusion Nickel-based powder metallurgy superalloy are conducted at various deformation conditions. The contact friction coefficient (f) between the die and forged part is determined as 0.30-0.40 by analyzing the results of simulation and the real experiment. A new coefficient B is introduced to evaluate the bulging levels and relate the value of f. The critical strains to prevent peripheral cracks are found to relate closely to the processing parameters. Thermally induced porosity and MC type carbides of grain boundaries are the primary mechanism for inducing cracks. Examinations on microstructure of cracking demonstrate that the cracks propagate along grain boundaries. A model is proposed to illustrate the formation of fractures during hot forging.

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Characterization of hot compression behavior of a new HIPed nickel-based P/M superalloy using processing maps

Cited by 57 publications

References 42 publications

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

Hot Deformation Behavior of a New Al–Mn–Sc Alloy

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel‐Based Superalloy on Simulation and Experiment

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