With the aim of tailoring the texture of Zr alloys by twin recrystallization, the recrystallization mechanism and texture evolution of a tensile-twin-containing Zr702 were investigated in this work. Two types of rolli...
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With the aim of tailoring the texture of Zr alloys by twin recrystallization, the recrystallization mechanism and texture evolution of a tensile-twin-containing Zr702 were investigated in this work. Two types of rolling modes, simple rolling along former normal direction (ND) and cross rolling along former ND and rolling direction (RD) at cryogenic temperature, were conducted in a Zr702 sheet with a basal texture to activate high density tensile twins, and subsequent annealing was applied to induce twin recrystallization. During cryogenic rolling, [[EQUATION]] and [[EQUATION]] tensile twins were activated, which resulted in a texture change of c-axis keeping away from ND and tilting close to transverse direction (TD) along the ND-TD plane. And a [[EQUATION]] twin band- [[EQUATION]] twin band- [[EQUATION]] twin band lamellar structure formed inside the twinned grains at high thickness reductions due to the growth of [[EQUATION]] twins between parallel [[EQUATION]] twins. When rolling direction is RD for cross rolling, the grain orientations were more beneficial to the activation of prismatic slip than tensile twinning, leading to lower area fractions of tensile twins and sluggish texture change in cross-rolled samples. However, the final textures of the two types of rolled samples at 30% thickness reduction were similar. During annealing, twin recrystallization in tensile twins featured by bulging of twin boundaries and conventional discontinuous recrystallization at original grain boundaries occurred in twinned grains. Recrystallized grains formed in tensile twins had orientations closed to the un-recrystallized twins and contributed to the generation of a uniform texture of c-axis tilted close to TD along ND-TD plane in rolled and annealed samples, regardless of the different area fractions of twins and the various rolled textures at different thickness reductions. Few recrystallized grains nucleating in [[EQUATION]] twins gave rise to the disappearance of c-axis p
To solve the complex 3-D space pipe routing problem, an algorithm framework combining genetic algorithm and adaptive A * algorithm (AAGA) is proposed. The initial population of the genetic algorithm is generated usin...
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ISBN:
(数字)9781728176871
ISBN:
(纸本)9781728176888
To solve the complex 3-D space pipe routing problem, an algorithm framework combining genetic algorithm and adaptive A * algorithm (AAGA) is proposed. The initial population of the genetic algorithm is generated using the adaptive A * algorithm combined with the concept of intermediate join points, this method is also used in the generation of sub-paths in the crossover and mutation operations of genetic algorithms. On the one hand, this method improves the quality of the initial population and speeds up the optimization of genetic algorithm, on the other hand, it solves the problem that the genetic algorithm combined with the traditional A * algorithm (AGA) is prone to redundant inflection points. Finally, on the premise of ensuring pipeline connectivity, pipeline length and number of inflection points, the constraints of pipeline center of gravity and minimum bending radius are added to carry out simulation experiments. Simulation results show that the AAGA has better performance than adaptive A * algorithm and AGA.
This paper presents the hydrogen risk analysis of a large Pressurized Water reactor (PWR) undergoing a severe accident using the HYDRAGON code. The code has been developed by the Department of Engineering Physics, Tsi...
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Burnup algorithm analysis is an important part of the physical calculation in reactor. The computing accuracy of burnup algorithms is directly related to the correctness of the whole physical calculation. Due to the d...
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Multipolar spindle is a common feature of many cancer cells,and recent experiments have shown that it is sensitive to mechanical constraints from extracellular microenvironment,which can either suppress or promote the...
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Multipolar spindle is a common feature of many cancer cells,and recent experiments have shown that it is sensitive to mechanical constraints from extracellular microenvironment,which can either suppress or promote the appearance of multipolar ***,little is known about what is the difference between various forms of mechanical confinements,and how they affect multipolarity and chromosomesegregation fidelity.
Epithelial monolayer is subjected to various mechanical forces,such as stretching,shearing and ***,its mechanical response to external loadings is essential for its biological ***,the mechanism of the fracture failure...
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Epithelial monolayer is subjected to various mechanical forces,such as stretching,shearing and ***,its mechanical response to external loadings is essential for its biological ***,the mechanism of the fracture failure of epithelial monolayer remains poorly ***,by introducing a new type of topological transition,i.e.,detach transition or T4 transition,we developed a modifiedcellular vertex model to investigate the rupture of cell monolayer.
reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the re...
reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the reactor coolant system. Although some international standards stipulating requirements for the decoupling of subsystems from the main system, in order to further explore the influence of decoupling steam pipes, the seismic response of reactor coolant system with or without steam pipes is simulated by using ANSYS program. Firstly, the modal analysis of reactor coolant system is carried out to analysis the influence of steam pipes on the resonant frequency of reactorsystem. Then, the standardized seismic dynamic analysis of reactorsystem with or without steam pipes is carried out. The nozzle load (inlet and outlet nozzle load of main device, such as reactor pressure vessel, steam generator, pump) and support load (of main device such as reactor pressure vessel, steam generator, pump) are output and compared. According to nozzle load and support load, it can be seen that the steam pipes have little influence on the seismic analysis of reactor coolant system, i.e. steam pipes can be decoupled in the seismic analysis of reactor coolant system.
Due to the merits of high flow rate and high lift, double-suction centrifugal pumps are widely used for agricultural irrigation along the Yellow River in northern China. The operational conditions of the pump are high...
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Cyber security event is one of the main concerns in instrumentation and control system of nuclear power plant, since the application and popularity of digital technology in industrial control area. To ensure the cyber...
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Accompanied with strict requirements on accuracy and determinacy in nuclear power industrial safety Digital Control system (DCS), time-triggered technology has been used in Ethernet widely, while another network proto...
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