TY - JOUR
T1 - Rapid monotectic solidification under free fall condition
AU - Liu, Xiangrong
AU - Lu, Xiaoyu
AU - Wei, Bingbo
PY - 2004/8
Y1 - 2004/8
N2 - Fe-48.8% Sn monotectic, Fe-40% Sn hypomonotectic and Fe-58% Sn hypermonotectic alloys have been rapidly solidified during free fall processing in drop tube. For droplets of 100-1000 μm, the maximum undercooling for Fe-48.8% Sn, Fe-40% Sn and Fe-58% Sn alloys is 270, 282 and 288 K respectively. For Fe-48.8% Sn monotectic alloy, a homogeneously dispersed microstructure can be obtained when the droplet diameter is small, and the Marangoni migration velocity Vm is 37 times as fast as Stokes velocity Vs when the dispersion sphere radius is 6 μm and undercooling is 30 K. For Fe-40% Sn hypomonotectic alloy, the microstructure undergoes a transition from columnar α-Fe dendrites distributed in Sn-rich matrix to α-Fe particles. The growth velocity of α-Fe dendrite changes from 0.45 to 4.65 m/s when the droplet diameter varies from 1000 to 100 μm. For Fe-58.8% Sn hypermonotectic alloy, the grain size of primary α-Fe dendrites decreases remarkably when undercooling increases. Copyright by Science in China Press 2004.
AB - Fe-48.8% Sn monotectic, Fe-40% Sn hypomonotectic and Fe-58% Sn hypermonotectic alloys have been rapidly solidified during free fall processing in drop tube. For droplets of 100-1000 μm, the maximum undercooling for Fe-48.8% Sn, Fe-40% Sn and Fe-58% Sn alloys is 270, 282 and 288 K respectively. For Fe-48.8% Sn monotectic alloy, a homogeneously dispersed microstructure can be obtained when the droplet diameter is small, and the Marangoni migration velocity Vm is 37 times as fast as Stokes velocity Vs when the dispersion sphere radius is 6 μm and undercooling is 30 K. For Fe-40% Sn hypomonotectic alloy, the microstructure undergoes a transition from columnar α-Fe dendrites distributed in Sn-rich matrix to α-Fe particles. The growth velocity of α-Fe dendrite changes from 0.45 to 4.65 m/s when the droplet diameter varies from 1000 to 100 μm. For Fe-58.8% Sn hypermonotectic alloy, the grain size of primary α-Fe dendrites decreases remarkably when undercooling increases. Copyright by Science in China Press 2004.
KW - Containerless processing
KW - Monotectic solidification
KW - Phase separation
KW - Undercooling
UR - https://www.scopus.com/pages/publications/34147144034
U2 - 10.1360/04ye0024
DO - 10.1360/04ye0024
M3 - 文章
AN - SCOPUS:34147144034
SN - 1006-9321
VL - 47
SP - 409
EP - 420
JO - Science in China, Series E: Technological Sciences
JF - Science in China, Series E: Technological Sciences
IS - 4
ER -