Rheological behaviour of the mushy zone and its effect on the formation of casting defects during solidification
作者： A.K. Dahle , D.H. StJohn
DOI: 10.1016/S1359-6454(98)00342-5
关键词:
摘要: A new conceptual framework has been developed which explains the formation of shear-related casting defects such as porosity, segregation and tears. The theory relates defect to mechanical behaviour partially solidified microstructure when shear stresses are during filling a by subsequent feeding processes solidification. Two transition points, dendrite coherency point maximum packing solid fraction, divide mushy zone into three regions different behaviours. response mush is related presence these zones solidification casting. resulting rationalized considering governing local stress rate, strength time available for fluid flow. design casting, process used alloy composition all influence relative importance shearing on formation.
uq.edu.au
elsevier.com参考文章(12)
Z. Kembłowski, J. Ferguson, Applied Fluid Rheology ,(1991)
Karl U Kainer, Barry L Mordike, None, Magnesium Alloys and Their Applications ,(1992)
C.P. Chen, C.-Y.A. Tsao, Semi-solid deformation of non-dendritic structures—I. Phenomenological behavior Acta Materialia. ,vol. 45, pp. 1955- 1968 ,(1997) , 10.1016/S1359-6454(96)00312-6
P. D. McCormack, L. Crane, Stanley Corrsin, Physical Fluid Dynamics Physics Today. ,vol. 27, pp. 48- 49 ,(1974) , 10.1063/1.3128638
A.K. Dahle, L. Arnberg, Development of strength in solidifying aluminium alloys Acta Materialia. ,vol. 45, pp. 547- 559 ,(1997) , 10.1016/S1359-6454(96)00203-0
Merton C. Flemings, Behavior of metal alloys in the semisolid state Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science. ,vol. 22, pp. 269- 293 ,(1991) , 10.1007/BF02661090
Arne K. Dahle, Lars Arnberg, The rheological properties of solidifying aluminum foundry alloys JOM. ,vol. 48, pp. 34- 37 ,(1996) , 10.1007/BF03222888
Guocai Chai, Dendrite coherency during equiaxed solidification in aluminium alloys Stockholm University. ,(1994)
Roy Elliott, Chapter 2 – The eutectic solidification process Eutectic Solidification Processing#R##N#Crystalline and Glassy Alloys. pp. 55- 91 ,(1983) , 10.1016/B978-0-408-10714-3.50007-1
A.K. Dahle, D.H. StJohn, Rheological behaviour of the mushy zone and its effect on the formation of casting defects during solidification Acta Materialia. ,vol. 47, pp. 31- 41 ,(1998) , 10.1016/S1359-6454(98)00342-5