Effect of Forced Convection on Grain Refinement of S32205 Duplex Stainless Steel

Abstract:

The effects of forced convection on grain refinement of S32205 duplex stainless steel (DSS) were investigated using a continuous casting simulation setup. The sample, which was called slab simulating unit here, was solidified in the continuous casting simulation setup, whose temperature was controlled according to the cooling curve of a DSS slab center, with the bottom cooled by running water to simulate the solidification process of slab. Forced convection was generated by square-wave mechanical stirring. The CET (columnar to equiaxed transition) was gradually promoted by forced convection when the rotation of the crucible speeded up, the microstructure was refined significantly. The average columnar zone length was reduced from 8.2 cm to 4.8 cm, the equiaxed grain average size decreased from 9.5 mm to 1.7 mm, and the microstructure was refined from Widmänstatten plates to island-shaped pieces.

• Periodical: Advanced Materials Research (Volume 683)
• Pages: 626-630
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.683.626
• Online since: April 2013
• Authors: Xiang Ru Chen, Hong Gang Zhong, Chang Jiang Song, Qi Jie Zhai
• Keywords: CET, Duplex Stainless Steel, Equiaxed Grains, Forced Convection, Grain Refinement

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