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| EFFECT OF SUPERHEATING ON THE SUB-RAPID SOLIDIFIED MICROSTRUCTURE OF AISI 304 AUSTENITIC STAINLESS STEEL STRIP |
| ;Jianchao Ma;Wenhui Tong |
| 中国科学院金属研究所 |
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Cite this article:
Jianchao Ma; Wenhui Tong. EFFECT OF SUPERHEATING ON THE SUB-RAPID SOLIDIFIED MICROSTRUCTURE OF AISI 304 AUSTENITIC STAINLESS STEEL STRIP. Acta Metall Sin, 2007, 43(8): 879-882 .
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Abstract The effect of superheating on the sub-rapid solidified microstructure of AISI 304 austenitic stainless steel strip cast by water-cooled copper mould casting was investigated. The results show that the solidified microstructure of the as-cast strip of AISI 304 stainless steel is composed of cellular austenite, columnar ferrite dendrite, and equiaxed ferrite dendrite, from the surface to the center of the strip, respectively. With the increase of superheating, both the primary arm spacing of cellular austenite and the secondary arm spacing of ferrite dendrite raise, while the delta ferrite fraction decreases. As the melt superheating raises, the supercooling of melt falls, then the cooling rate of melt decreases, resulting in the increase of dendritic arm spacing of austenite and delta ferrite. The decrease of cooling rate also accelerates the transformation from delta ferrite to austenite during the subsequent cooling process after solidification, leading to the reduction of residual delta ferrite fraction.
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Received: 12 February 2007
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