Theoretical study on the model of metalic melt shearing flow near the surface and its effect on solidification microstructure

doi:10.7498/aps.64.116601

CORC > 兰州理工大学 > 兰州理工大学 > 发展规划处

	Theoretical study on the model of metalic melt shearing flow near the surface and its effect on solidification microstructure
	Wang Xiang 1; Chao Run-Ze 2; Guan Ren-Guo 1,3; Li Yuan-Dong 3; Liu Chun-Ming 1
刊名	ACTA PHYSICA SINICA
	2015-06-05
卷号	64 期号:11
关键词	solidification flowing near surface shear columnar crystal
ISSN号	1000-3290
DOI	10.7498/aps.64.116601
英文摘要	In this paper, the model of metalic melt shearing flow near the surface is established, and the effect of shearing flow on solidification microstructure of the metal is also analyzed. Calculated results based on A356 alloy melt show that in the laminar flowing melt, the shear stress decreases with increasing length along the vertical direction of the surface of the slope, and the shear stress first decreases rapidly and then stabilizes with increasing length along the flowing direction of the surface of the slope; while in the turbulent flowing melt, the shear stress firstly decreases rapidly and then stabilizes with increasing length along the vertical direction of the surface of the slope, and increases with increasing length along the flowing direction of the surface of the slope. The shear stress at the same position in the melt on the surface of the slope increases with increasing angle of the slope; the shear stress acting on the columnar crystal in the melt on the surface of the slope increases with decreasing length along the vertical direction of the surface of the slope. The shear stress acting on the columnar crystal at the same position in the melt on the surface of the slope increases with increasing angle of the slope; with the increase of the length along the flowing direction, the shear stress acting on the columnar crystal rapidly decreases first and then stabilizes in the laminar flowing melt on the surface of the slope, while the shear stress increases in the turbulently flowing melt on the surface of the slope. Based on the theoretical calculation, the maximum shear stress acting on the columnar crystal in the melt during the shearing flow near the surface of the metalic melt is lower than the yield strength of ff -Al grain, so the shear stress induced by shearing flow cannot break the columnar crystal, and only by sweeping the grain into the melt to induce the multiplication of grain, which agrees with the experimental results. So, the proposed model can explain the constitutive relations of the metalic melt shearing flow near the surface and the effect of shear stress on the solidification microstructure.
资助项目	National Natural Science Foundation of China[51222405] ; National Natural Science Foundation of China[51474063]
WOS研究方向	Physics
语种	中文
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000355695600042
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34035]
专题	发展规划处兰州理工大学材料科学与工程学院
通讯作者	Guan Ren-Guo
作者单位	1.Northeastern Univ, Sch Met & Mat, Shenyang 110819, Peoples R China 2.Luoyang Ship Mat Res Inst, Luoyang 471000, Peoples R China 3.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Wang Xiang,Chao Run-Ze,Guan Ren-Guo,et al. Theoretical study on the model of metalic melt shearing flow near the surface and its effect on solidification microstructure[J]. ACTA PHYSICA SINICA,2015,64(11).
APA	Wang Xiang,Chao Run-Ze,Guan Ren-Guo,Li Yuan-Dong,&Liu Chun-Ming.(2015).Theoretical study on the model of metalic melt shearing flow near the surface and its effect on solidification microstructure.ACTA PHYSICA SINICA,64(11).
MLA	Wang Xiang,et al."Theoretical study on the model of metalic melt shearing flow near the surface and its effect on solidification microstructure".ACTA PHYSICA SINICA 64.11(2015).