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Investigation of the Microstructure of Rolled Semi-Solid Steel

Journal of Materials science & technology 2002年第3期18卷 281-282页

作者： renbo song, yonglin kang, jianlin sun, xiongfei yang, aimin zhao and weimin maodepartment of metal forming, university of science and technology beijing, beijing 100083, china [ Manuscript received March 15, 2001, in revised form May L5, 2001] Dept. of metal forming Univ. of Sci. and Technol. Beijing Beijing 100083 China

In this paper, spring steel-60Si2Mn and stainless steel-1Cr18Ni9Ti were rolled one pass in the semi-solid state. The microstructural evolution during rolling of the steels with different solid fraction was investigated. The experimental results showed that the manner of liquid and solid phases flowing and deforming was different. During rolling, most of solid phases remained in the center of the rolled specimens, while liquid phase flowed to the edge, which resulted in the macrosegregation of liquid and solid phases. Only the amount of solid fraction reached a certain value, were the solid phases deformed and flattened.

关键词： Spring steel Stainless steel Semi-solid Microstructure

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EXPERIMENTAL STUDY ON THE STEELS DIRECT ROLLING PROCESSING IN THE SEMI-SOLID STATE

EXPERIMENTAL STUDY ON THE STEELS DIRECT ROLLING PROCESSING I...

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第二届半固态金属加工技术研讨会

作者： kang yonglin, song renbo, sun jianlin, zhao aimin, WANG Jiwen, MAO weimin School of Materials science and Engineering, university of science and technology, beijing 100083, china

In this paper, the study on the microstructure evolution of semi-solid spring steel (60Si2Mn) has been carried out with different solid fraction during direct rolling. The slurry was fabricated by electromagnetic stirring. The experimental device of direct rolling system was designed in person. The research results show that the growth manner of conventional dendrite arm has changed by stirring. The mechanism of semi-solid microstructure formation mainly includes that the dendrite arm melts off at its root and the dendrite arm bends under flow stresses. The manner of liquid and solid phases flowing and deforming during rolling was different with the solid fraction changing, which resulted in liquid and solid phases macrosegregation. With the solid fraction increasing, the phenomenon of segregation did not become obviously. When the solid fraction reached certain value, the primary solid phases generated plastic deformation. In addition, the tiny surface crack is unavoidable without further rolling for semi-solid slurry.

关键词： semi-solid rolling solid fraction microstructure macrosegregation property

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