Gradient microstructure evolution under thermo-mechanical coupling effects for a nickel-based powder metallurgy superalloy－Dynamic recrystallization coexist with static recrystallization

In order to investigate microstructure evolution of Mn18Cr18N retaining ring during the multi-fire forging, a series of constitutive equations for dynamic recrystallization, static recrystallization, meta-dynamic recrystallization and grain growth were developed and implemented into a Deform FE simulator. The single-axial hot upsetting test has been performed to investigate the process of microstructure evolution and to show validity and effectiveness of the developed program. Then based on the modified boundary condition, hot forging process for 300MW retaining ring was put into effect. The results have displayed that the microstructure prediction tool was validated by comparing the simulated grain structure with that of the experiment and it could provide a reference to optimize forging processes in the production of retaining ring.

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Microstructure evolution and mechanical properties of Al-8wt. % Si semi-solid billet fabricated by powder metallurgy liquid phase reaction sintering

Materials Science and Engineering A ◽

10.1016/j.msea.2020.140656 ◽

2021 ◽

Vol 802 ◽

pp. 140656

Author(s):

Wenchao Liu ◽

Lianxi Hu ◽

Jingyuan Shen ◽

Fei Gao ◽

Yu Sun

Keyword(s):

Mechanical Properties ◽

Powder Metallurgy ◽

Liquid Phase ◽

Microstructure Evolution ◽

Phase Reaction ◽

Reaction Sintering ◽

Semi Solid ◽

Liquid Phase Reaction

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Subdivision of dynamic recrystallization mechanism in transition zone and microstructure evolution of Incoloy825 alloy

Advanced Engineering Materials ◽

10.1002/adem.202101348 ◽

2022 ◽

Author(s):

Shuang Liu ◽

Jing Feng ◽

Xi Luo ◽

Xi Chen ◽

Yiyou Tu ◽

...

Keyword(s):

Dynamic Recrystallization ◽

Transition Zone ◽

Microstructure Evolution ◽

Recrystallization Mechanism

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Chemical-Mechanical Coupling Effects on the Permeability of Shale Subjected to Supercritical CO 2-Water Exposure

SSRN Electronic Journal ◽

10.2139/ssrn.3934204 ◽

2021 ◽

Author(s):

Kang Yang ◽

Junping Zhou ◽

Xuefu Xian ◽

Lei Zhou ◽

Chengpeng Zhang ◽

...

Keyword(s):

Coupling Effects ◽

Mechanical Coupling ◽

Water Exposure

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Simulation of microstructure evolution during recrystallization using a high resolution three dimensional cellular automaton

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:200412026 ◽

2004 ◽

Vol 120 ◽

pp. 225-230

Author(s):

P. Mukhopadhyay ◽

M. Loeck ◽

G. Gottstein

Keyword(s):

High Resolution ◽

Cellular Automata ◽

Cellular Automaton ◽

Microstructure Evolution ◽

Static Recrystallization ◽

Three Dimensional ◽

Computation Time ◽

Recrystallization Process ◽

Recovery Condition ◽

Physically Based

A more refined 3D cellular Automata (CA) algorithm has been developed which has increased the resolution of the space and reduced the computation time and can take care of the complexity of recrystallization process through physically based solutions. This model includes recovery, condition for nucleation and orientation dependent variable nuclei growth as a process of primary static recrystallization. Incorporation of microchemistry effects makes this model suitable for simulating recrystallization behaviour in terms of texture, kinetics and microstructure of different alloys. The model is flexible to couple up with other simulation programs on a common database.

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Research on Temperature Change and Microstructure Evolution of Bore in Steel Target Penetrated by Copper Jets

Materials Science Forum ◽

10.4028/www.scientific.net/msf.667-669.641 ◽

2010 ◽

Vol 667-669 ◽

pp. 641-646

Author(s):

Hao Chen ◽

Gang Tao

Keyword(s):

Numerical Simulation ◽

Grain Size ◽

Dynamic Recrystallization ◽

Temperature Change ◽

Microstructure Evolution ◽

Channel Wall ◽

Cooling Time ◽

Steel Target

Copper fragments are found to adhere on penetration channel wall after copper jets penetrate steel target, and the research on it is helpful to know microstructure evolution of jets in the process of penetration and cooling time. This paper is based on the observation of bore in steel target penetrated by copper jets, and uses numerical simulation to study the process of copper jets penetration, then the change of temperature and grain size of jets adhered on penetration channel wall can be gotten, and the results agree with the observation of penetration channel wall taken by SEM. From the observations of copper and steel, we can get the conclusion that copper jets are not melted but have dynamic recrystallization in the process of penetration, then copper grain size increases obviously in cooling time, and twins are formed at the same time.

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