Characterization of hot deformation behavior of GH925 superalloy using constitutive equation, processing map and microstructure observation

Shi, Zhaoxia; Yan, Xiaofeng; Duan, Chunhua

doi:10.1016/j.jallcom.2015.08.118

Cited by 74 publications

(17 citation statements)

References 29 publications

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“…In addition, it is convenient to extract the recommended processing parameters corresponding to the desirable DRX micro-evolution mechanisms through thermal processing map. Up today, the basis of processing map has been successfully applied in titanium alloy [7][8] , aluminum alloy [9][10] , super alloy [11][12] , etc. In recent years, many scholars began paying attention to the micro-evolution mechanisms identification of alloys by processing map combined with other indicators [13][14] .…”

Section: Introductionmentioning

confidence: 99%

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

Tong¹,

Quan

Zhao

et al. 2019

Mat. Res.

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In order to achieve hot processing products with expected microstructures, the construction of corresponding relationships between micro-evolution mechanisms and hot processing parameters is essential. In this study, such corresponding relationships of as-cast AlCu4SiMg alloy were constructed by double evaluating processing maps and Zener-Holloman (Z) parameter maps. Based on the stressstrain data obtained from a series of isothermal compression experiments, the processing maps of AlCu4SiMg alloy were constructed at the strain of 0.3, 0.5, 0.7 and 0.9 s-1. The processing maps revealed that the optimal hot deformation parameter windows corresponding to dynamic recrystallization (DRX) micro-evolution mechanism mainly appear at high temperature and moderate strain rate. On the other hand, the response maps of Z parameter at discrete strains were constructed, and the ideal processing windows were calibrated at the domains with relatively low lnZ-value. A phenomenon was found that the optimal deformation parameter windows identified by Z parameter are more conservative than those identified by processing map. By integrating processing maps and Z parameter maps, the optimal processing parameter windows corresponding to DRX micro-evolution mechanism for AlCu4SiMg alloy were finally obtained.

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Section: Introductionmentioning

confidence: 99%

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

Tong¹,

Quan

Zhao

et al. 2019

Mat. Res.

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“…Wang et al [11] identified the recrystallization region and instability region of X-750 nickel-based superalloy by microstructure observations, and the optimum hot working parameters were proposed. Shi et al [12] established the hot processing map of GH925, and results showed a stable domain and an instability domain existed. The processing maps of GH4169, although they have been investigated by some researchers [13,14], have not been systematically constructed by microstructure examinations, and the microstructure evolutions of different domains were unclear, which has caused difficulty in microstructure optimization in hot forging.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Modelling and Hot Workability Analysis by Microstructure Examination of GH4169 Alloy

Chen

Zheng

et al. 2018

Crystals

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The relationships between hot deformation parameters and flow behaviour have attracted many researchers' attention for the past few decades, whilst precise constitutive modelling of GH4169 remained a problem, which seriously affected the process and microstructure control of alloys. In this work, a modified Arrhenius type model was introduced to describe the flow stresses of various compression conditions. The model showed high precision in flow stress prediction. In order to facilitate workability evaluation for engineering applications, the hot processing maps were established at the strain of 0.4~0.6. The processing maps revealed an instability domain at 900~950 • C and 0.1~1 s −1 , a high dissipation efficiency domain at 1060~1100 • C and 0.001~0.01 s −1 , and a stable deformation domain for the rest of processing parameters. Microstructures of each domain were observed via optical microscope (OM) and electron backscattered diffraction (EBSD). The intriguing finding was that the microstructures morphology agreed well with the descriptions in "discontinuous mechanism", and incompletely recrystallized microstructures were found in the instability domain. Fully recrystallized microstructures were found in the stable deformation domain, and grain coarsen in the high dissipation efficiency domain. Optimal hot working conditions were suggested based on the microstructure analysis. This investigation contributed to a comprehensive understanding of the workability of GH4169.

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“…Processing maps which determine optimal deformation parameters and explain different deformation mechanisms can be used to control microstructures. Currently, processing maps based on DMM have been widely used for the characteristics of convenience, accuracy, and quickness . For example, the processing map of nickel‐based corrosion resistant alloy was studied in the temperature range of 950–1200 °C and the strain rate range of 0.001–10 s −1 .…”

Section: Introductionmentioning

confidence: 99%

“…Currently, processing maps based on DMM have been widely used for the characteristics of convenience, accuracy, and quickness. [12][13][14][15][16] For example, the processing map of nickel-based corrosion resistant alloy was studied in the temperature range of 950-1200 8C and the strain rate range of 0.001-10 s À1 . [17] The high temperature flow behavior and processing map of 7075 aluminum alloy were studied by hot compressive test.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Processing Map of 40MnBH Alloy Steel

Chai

Zhang

Guo

et al. 2016

steel research int.

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The hot deformation behavior of the 40MnBH alloy is investigated by isothermal compression tests at the temperature of 900–1200 °C with the strain rate of 0.05, 0.5, and 5s−1, and the degree of compression ranging from 15 to 60%. The effects of deformation parameters are studied through the true stress–strain curve under different deformation conditions. The processing maps are constructed based on the dynamic material model. Microstructures of 40MnBH steel at different deformation conditions are observed. The results show that the stress of the alloy has a dependence on strain rate and deformation temperature. A constitutive model is built, which described the flow stress behavior of the alloy. The processing maps reveal that with the increase in the degree of compression, the instability regions decrease. The results of processing maps have been verified through the microstructures of the 40MnBH steel.

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Characterization of hot deformation behavior of GH925 superalloy using constitutive equation, processing map and microstructure observation

Cited by 74 publications

References 29 publications

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

Constitutive Modelling and Hot Workability Analysis by Microstructure Examination of GH4169 Alloy

Hot Deformation Behavior and Processing Map of 40MnBH Alloy Steel

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