Microstructure Transformation Process of Lean Duplex Stainless Steel 2101 in Vertical Continuous Casting Slab

doi:10.11901/1005.3093.2019.552

Chinese Journal of Materials Research

2020, Vol. 34

Issue (6): 410-416 DOI: 10.11901/1005.3093.2019.552

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Microstructure Transformation Process of Lean Duplex Stainless Steel 2101 in Vertical Continuous Casting Slab

BAI Liang¹^,²(

), JI Kun¹^,², LIU Jingshun¹^,², LIU Jun¹^,², DONG Junhui¹^,², NAN Ding¹^,²

1.Inner Mongolia University of Technology, Huhhot 010051, China
2.Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating, Huhhot 010051, China

Cite this article:

BAI Liang, JI Kun, LIU Jingshun, LIU Jun, DONG Junhui, NAN Ding. Microstructure Transformation Process of Lean Duplex Stainless Steel 2101 in Vertical Continuous Casting Slab. Chinese Journal of Materials Research, 2020, 34(6): 410-416.

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Abstract

The macro grain size distribution and microstructure change of the slab of Lean duplex stainless steel 2101 was investigated. It was concluded that columnar equiaxed crystal transformation (CET) occurred in the location, where is at the end of section No.2 of the secondary cooling zone with 25 mm from the slab surface. Decreasing the slab surface cooling strength in this zone will reduce internal temperature gradient in the shell, and promote CET transition, improve the rate of equiaxial crystal and expand the equiaxial zone at the corner. The results of microstructure analysis show that behind the section No. 6 in secondary cooling zone the morphology of austenite formed in the core of the billet can be adjusted by increasing the cooling intensity, which is also beneficial to the refinement of austenite morphology in the grain and at the grain boundary. Size of the acicular austenite structure at the grain boundary can be reduced, so as to improve the heat deformation ability of the billet.

Key words: Metallic materials Microstructure of slab Experimental study 2101 duplex stainless steel Transformation process

Received: 26 November 2019

ZTFLH:

TG142.1+1

Fund: National Natural Science Foundation of China(51474143);Colleges and University Scientific Research Project of Inner Mongolia(NJZY19071);Scientific Research Project of Inner Mongolia(2015BS0510);Key Discipline Group Project of Materials, Science of Inner Mongolia University of Technology(ZD202012)

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	Liang BAI
	Kun JI
	Jingshun LIU
	Jun LIU
	Junhui DONG
	Ding NAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.552 OR https://www.cjmr.org/EN/Y2020/V34/I6/410

Fig.1 Schematic diagram of the vertical continuous caster

Table 1 Parameters of the continuous caster

Table 2 Chemical composition of 2101duplex stainless steel (%, mass fraction)

Fig.2 Cut direction and position of the sample on the slab

Fig.3 Microstructure of industrial continuous casting slab

Fig.4 Enlarged view of microstructure of No. 3

Fig.5 Temperature field and thickness growth of the slab

Fig.6 Microstructure at wide and narrow side of slab (a) Surface of wide side; (b) 15 mm from wide side surface; (c) 55 mm from wide side surface；(d) Surface of narrow side; (e) 15mm from narrow side surface; (f) 55 mm from narrow side surface

Fig.7 Competition growth (a) and termination (b) of columnar crystals

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