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UNUSUAL SOLIDIFICATION MICROSTRUCTURE OF Fe_(70)Cr_(18)Mo_2Si_1B_9 SINGLE-ROLL QUENCHED RIBBON |
LIN Yijian;YOU Yunlong;ZHANG Xiaomin;JING Chunyong;YU Quanqin Shanghai Iron and Steel Research Institute |
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Cite this article:
LIN Yijian;YOU Yunlong;ZHANG Xiaomin;JING Chunyong;YU Quanqin Shanghai Iron and Steel Research Institute. UNUSUAL SOLIDIFICATION MICROSTRUCTURE OF Fe_(70)Cr_(18)Mo_2Si_1B_9 SINGLE-ROLL QUENCHED RIBBON. Acta Metall Sin, 1988, 24(6): 487-493.
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Abstract The solidification microstructure of Fe_(70)Cr_(18)Mo_2Si_1B_9 single-roll quench-ed ribbons with different rotating speed of roller and under different atmosphereconditions was investigated. Apart from usual crystallization by homogeneous andheterogeneous nucleation, it was found that α-iron columnar grains with strongpreferred orientation formed beneath free surface and that spheres of α-iron singlecrystal with a size of several μm up to 20 μm, which have rarely been reported,appeared inside the ribbons. There was experimental evidence suggesting that clust-ers of metal atoms formed from fluctuation in early undercooled liquid might playa role as pre-existed nuclei and, in fact, control. the formation of amorphous forthis alloy.
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Received: 18 June 1988
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