Microstructures of Austenitic Stainless Steel Produced by Twin-Roll Strip Caster

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Abstract The microstructures of austenitic stainless steel strip were studied using color metallographic method and electron probe micro analysis (EPMA). In the cast strips, there are three kinds of solidification structures: fine cellular dendrite in the surface layer, equiaxed grains in the center and fine dendrite between them. The solidification mode in the surface layer is the primary austenite AF mode because of extremely high cooling rate, with the retained ferrite located around the primary cellular austenite. In the fine dendrite zone, the solidification mode of molten stainless steel changes to FA mode and the residual ferrite with fish-bone morphology is located at the core of the dendrite. The retained ferrite of equiaxed grains in the center is located in the center of broken primary ferrite dendrite with vermicular morphology.

Key words�� strip casting solidification microstructure stainless steel retained ferrite

Received: 13 January 2011 Published: 23 February 2012

Corresponding Authors: HUANG Fuxiang E-mail: fuxianghuang@gmail.com

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	HUANG Fu-Xiang
	YU Mo-Jun

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HUANG Fu-Xiang,YU Mo-Jun. Microstructures of Austenitic Stainless Steel Produced by Twin-Roll Strip Caster[J]. Chinese Journal of Iron and Steel, 2012, 19(2): 57-61.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2012/V19/I2/57