The solidification microstructure has an important effect on the mechanical properties of castings. Therefore, an FE （Finite Element） - CA （Cellular Automaton） coupling model was developed for the simulation of so...The solidification microstructure has an important effect on the mechanical properties of castings. Therefore, an FE （Finite Element） - CA （Cellular Automaton） coupling model was developed for the simulation of solidification structure during the continuous casting process of 72A tire cord steel. In the model, the effect of phase transformation （λ→γ→α） during solidification was considered based on a thermodynamic database. The effect of electromagnetic stirring （EMS） was determined by increasing both the thermal conductivity and crystal formation rate in the liquid phase. The results show that the cooling curves and solidification structure calculated by this model agree well with the experimental results. The optimum pouring temperature range for tire cord steel casting was also discussed based on the present model. By comprehensive consideration of billet quality and smooth production, the pouring temperature should be controlled at about 1,495 ℃ under the casting conditions of the local plant in this study.展开更多
Nickel-based superalloy lattice sandwich structures present higher stiffness,higher strength and higher temperature resistance in comparison with other metals.In this study,the Kagome unit was adopted to design the la...Nickel-based superalloy lattice sandwich structures present higher stiffness,higher strength and higher temperature resistance in comparison with other metals.In this study,the Kagome unit was adopted to design the lattice sandwich structure and ProCAST software was used to simulate the filling and solidification processes of the nickel-based superalloy.Grain morphology and sizes of the nickel-based superalloy lattice sandwich structures were simulated by using of cellular automaton coupled with finite element model(CAFE),and indirect additive manufacture combining with investment casting were carried out to fabricate the nickel-based superalloy lattice sandwich structures.The calculated grain morphology and sizes are in good agreement with the experimental results.The grains are mainly equiaxed with an average size of about 500µm.The simulated results also show that the superheat of melting and the mold preheated temperature have significant influence on the grain size of the Kagome lattice sandwich structures,lower superheat of melting and mold preheated temperatures are encouraged to obtain the fine grains while assuring the integrity of the Kagome lattice sandwich structures for industrial application.展开更多
This article utilizes the trope of domesticity/domestication in order to explore notions of gendered temporality in Hou Hsiao-hsien＇s Cafe Lumiere （2003）. In dialogue with the Chinese writer Eileen Chang and Wester...This article utilizes the trope of domesticity/domestication in order to explore notions of gendered temporality in Hou Hsiao-hsien＇s Cafe Lumiere （2003）. In dialogue with the Chinese writer Eileen Chang and Western theories about women＇s time and domestic temporality, the article proposes that the works of both Hou and Chang can be described as instances of ecriture feminine that interrogate an ambivalence toward domesticity. Drawing on Chantal Akerman＇s film in contrast to that of Hou, the article further demonstrates how the use of the cinematographic long take domesticates time and space, as well as the ways in which the horror of everyday domesticity have been captured through what Rey Chow calls ＂feminine details.＂ Finally, the present article argues that Cafe Lumiere domesticates a fear of domesticity and pregnancy through a reconfiguration of linear and cyclical time, a reversal of gender roles in its protagonists, and a privileging of aurality over visuality in its cinematic style, such that it presents the potential for a new kind of union and a new kind of futurity premised upon reordered gendered forms of temporality.展开更多
The Ballad of the Sad Caféis one of Mc Cullers’masterpieces.By depicting the triangle love story among the main characters—Miss Amelia,hunchbacked Cousin Lymon and Marvin Macy,the novella reveals the incredible...The Ballad of the Sad Caféis one of Mc Cullers’masterpieces.By depicting the triangle love story among the main characters—Miss Amelia,hunchbacked Cousin Lymon and Marvin Macy,the novella reveals the incredible complexity of human nature.By analyzing the absurd town,Miss Amelia’s free choices and the hellish relationship between its main characters from the Existentialist perspective,the main propositions of Existentialism have also been vividly reflected and also help to reveal the philosophical and social realistic significances behind the novella.展开更多
基金supported by the National Basic Research Program of China (grant No.2010CB630806)
文摘The solidification microstructure has an important effect on the mechanical properties of castings. Therefore, an FE （Finite Element） - CA （Cellular Automaton） coupling model was developed for the simulation of solidification structure during the continuous casting process of 72A tire cord steel. In the model, the effect of phase transformation （λ→γ→α） during solidification was considered based on a thermodynamic database. The effect of electromagnetic stirring （EMS） was determined by increasing both the thermal conductivity and crystal formation rate in the liquid phase. The results show that the cooling curves and solidification structure calculated by this model agree well with the experimental results. The optimum pouring temperature range for tire cord steel casting was also discussed based on the present model. By comprehensive consideration of billet quality and smooth production, the pouring temperature should be controlled at about 1,495 ℃ under the casting conditions of the local plant in this study.
基金financially supported by the National Science and Technology Major Project of China(No.2017ZA04014001)the Natural Science Foundation of Liaoning Province of China(Nos.2019-ZD-0997,20170540890)the Technology Development Fund of China Academy of Machinery Science and Technology(No.170217ZS01)
文摘Nickel-based superalloy lattice sandwich structures present higher stiffness,higher strength and higher temperature resistance in comparison with other metals.In this study,the Kagome unit was adopted to design the lattice sandwich structure and ProCAST software was used to simulate the filling and solidification processes of the nickel-based superalloy.Grain morphology and sizes of the nickel-based superalloy lattice sandwich structures were simulated by using of cellular automaton coupled with finite element model(CAFE),and indirect additive manufacture combining with investment casting were carried out to fabricate the nickel-based superalloy lattice sandwich structures.The calculated grain morphology and sizes are in good agreement with the experimental results.The grains are mainly equiaxed with an average size of about 500µm.The simulated results also show that the superheat of melting and the mold preheated temperature have significant influence on the grain size of the Kagome lattice sandwich structures,lower superheat of melting and mold preheated temperatures are encouraged to obtain the fine grains while assuring the integrity of the Kagome lattice sandwich structures for industrial application.
文摘This article utilizes the trope of domesticity/domestication in order to explore notions of gendered temporality in Hou Hsiao-hsien＇s Cafe Lumiere （2003）. In dialogue with the Chinese writer Eileen Chang and Western theories about women＇s time and domestic temporality, the article proposes that the works of both Hou and Chang can be described as instances of ecriture feminine that interrogate an ambivalence toward domesticity. Drawing on Chantal Akerman＇s film in contrast to that of Hou, the article further demonstrates how the use of the cinematographic long take domesticates time and space, as well as the ways in which the horror of everyday domesticity have been captured through what Rey Chow calls ＂feminine details.＂ Finally, the present article argues that Cafe Lumiere domesticates a fear of domesticity and pregnancy through a reconfiguration of linear and cyclical time, a reversal of gender roles in its protagonists, and a privileging of aurality over visuality in its cinematic style, such that it presents the potential for a new kind of union and a new kind of futurity premised upon reordered gendered forms of temporality.
文摘The Ballad of the Sad Caféis one of Mc Cullers’masterpieces.By depicting the triangle love story among the main characters—Miss Amelia,hunchbacked Cousin Lymon and Marvin Macy,the novella reveals the incredible complexity of human nature.By analyzing the absurd town,Miss Amelia’s free choices and the hellish relationship between its main characters from the Existentialist perspective,the main propositions of Existentialism have also been vividly reflected and also help to reveal the philosophical and social realistic significances behind the novella.
