Characterization of hot deformation behavior of alloy 617 through kinetic analysis, dynamic material modeling and microstructural studies

Babu, K. Arun; Mandal, Sumantra; Kumar, Ajoy; Athreya, C.N.; Boer, B. de; Sarma, V. Subramanya

doi:10.1016/j.msea.2016.04.004

Cited by 76 publications

(16 citation statements)

References 48 publications

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“…While establishing processing maps based on DMM, non-dimensional parameter j _ e ð Þ as defined in (16) is generally adopted to determine the instability of materials. 17 Similarly, the contour map of the instability criteria is drawn on the two-dimensional plane formed by strain rate _ e ð Þ and deformation temperature T ð Þ, thereby forming the instability map of the material. By overlapping the instability map on the power dissipation map, the processing maps are obtained.…”

Section: Processing Mapsmentioning

confidence: 99%

Research on high temperature deformation behavior of low carbon steel based on processing map

Dao-chun

Wang

Hua

2019

Advances in Mechanical Engineering

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The high temperature deformation behaviors of low-carbon steel QD08 were investigated by hot compression tests over temperatures from 1000°C to 1200°C and strain rates from 0.1 to 10 s 21. In order to describe the flow characteristics, a constitutive equation was developed and the relation between the flow stress and Zener-Hollomon parameter was successfully analyzed via the hyperbolic sine function under the whole range of deformation condition. It can be found that the critical strain e c increases with parameter Z increasing; the critical conditions for onset of dynamic recrystallization is e. e c = 61:9381Z 0:1033. Based on dynamic material model and Prasad's instability criterion, the power dissipation map and the instability map were developed. The results show that the security domain of hot deformation for low-carbon steel QD08 at the temperature range between 1070°C and 1100°C, and strain rate range of around 5-10 s 21 , with a higher power dissipation factor, maintains a smooth variation, under stable deformation conditions. On the basis of processing map, the optimal deformation processing parameters are the hot deformation temperature range from 1070°C to 1100°C, and strain rate range from 5 to 10 s 21 .

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Section: Processing Mapsmentioning

confidence: 99%

Research on high temperature deformation behavior of low carbon steel based on processing map

Dao-chun

Wang

Hua

2019

Advances in Mechanical Engineering

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“…DRX is intensely dependent on deformation degree, strain rate and temperature during hot deformation [14]; the recrystallization nuclei initially form in a local region (deformation band, grain boundary and near inclusion) with a high deformation degree. Two classical dynamic recrystallization nucleation theories, the DBs bulging mechanism and sub-grains rotation mechanism, are widely accepted by scholars [27,28]. The frequencies of LAGBs with θ in the range of 0-5 • have larger value when deformed at 1000 • C of 2W and 1050 • C of 4W, and the probable reason is that some deformed grains with a lot of deformed bands and sub-grains, which are dominated by LAGBs, are retained in the microstructure( see Figures 7a, 8a and 13).…”

Section: Effect Of Temperature On Microstructure and Recrystallizatiomentioning

confidence: 99%

Dynamic Recrystallization and Hot-Working Characteristics of Ni-Based Alloy with Different Tungsten Content

Gong

Bao

Yang

2019

Metals

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The hot deformation behavior of the GY200 Ni-based alloys with different tungsten (W) content were investigated by means of hot compression tests, microscopic observations, and processing maps at temperatures between 950 °C and 1200 °C, strain rate between 0.01 s−1 and 10 s−1 with strain of 0.9. The hyperbolic-sine type constitutive equations were established between peaks tress and deformation conditions through Z parameters, and for alloys with higher W content results in higher activation energy and complete recrystallization temperature. The hot-working maps were exploited based on the experimental data. The hot-working maps showed that the instability zone extended with increasing W content. The stable domain of alloys are located in the temperature range between 1025 °C and 1200 °C and strain rate range between 0.01 s−1 and 1 s−1, dominated by the dynamic recrystallization (DRX) microstructural evolution, suited for hot deformation. The cracking on the surface of the sample compressed at 950 °C was resulted from the tensile stress, while the fracture of the sample compressed at 1200 °C was triggered by the melting of grain boundaries.

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“…A processing map is an important tool for optimizing the thermal processing parameters of metallic materials. For different processing conditions, the processing map is usually used to evaluate the particular microstructure deformation mechanisms [9], which include dynamic recovery (DRV), dynamic recrystallization (DRX), the presence of adiabatic shear bands (ASBs), flow localization, the formation of wedge cracks. Processing maps help researchers master useful material processing information, predict unstable regions that should be avoided during thermal deformation, optimize processing parameters, precisely control structures, and avoid defects [10].…”

Section: Introductionmentioning

confidence: 99%

Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

et al. 2019

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Hot deformation behavior of Al-0.2Sc-0.04Zr (wt.%) aluminum alloy was investigated via conducting hot compression tests at temperatures of 440-600°C and at strain rates, ranging from 0.001 to 5 s-1 , at an interval of an order of magnitude. The characteristics of the true stress-strains acquired in the hot compression tests were investigated, and the influence of processing parameters on the microstructure of the deformed samples was observed by using optical microscope and electron back-scattered diffraction (EBSD). Two types of processing maps for Al-0.2Sc-0.04Zr alloy were developed using the Kumar-Prasad (K-P) and Murty-Rao (M-R) instability/stability criteria, respectively. The prediction results of two types of processing maps were examined. Based on the analysis of the M-R processing map and EBSD, a deformation mechanism map covering a wide range of temperature and strain rate was developed. The result shows that the flow stress had a rapid increase to the maximum stress, and subsequently, the flow stress decreases continually to be of steady-state type when the deformation continues on. The M-R criterion can more accurately predict the unstable region than the K-P criterion. The optimum temperature T and strain rate _ e combination conditions for Al-0.2Sc-0.04Zr alloy are T = 520-560°C, _ e = 10-3 s-1 or _ e = 0.1-5 s-1. The microstructure evolution dominated by the predominant or complete dynamic recrystallization can be acquired by deformation at the combination conditions. However, it is dominated mainly by dynamic recovery at lower temperatures (T \ 520°C) and by dynamic recrystallization at higher temperatures (T [ 520°C). In addition, the microstructure of specimen deformed at 600°C shows a growing and coarse trend. Moreover, the nano-dimension precipitate particles of Al 3 (Sc,Zr) are uniformly distributed throughout Al matrix. The efficiency parameter g value of Al-0.2Sc-0.04Zr alloy in processing maps is smaller in comparison with that in pure aluminum, and it could be attributed to these nano-dimension particles.

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Characterization of hot deformation behavior of alloy 617 through kinetic analysis, dynamic material modeling and microstructural studies

Cited by 76 publications

References 48 publications

Research on high temperature deformation behavior of low carbon steel based on processing map

Research on high temperature deformation behavior of low carbon steel based on processing map

Dynamic Recrystallization and Hot-Working Characteristics of Ni-Based Alloy with Different Tungsten Content

Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

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