QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH RESOLUTION SYNCHROTRON MICRO-CT

doi:10.11900/0412.1961.2015.00226

Acta Metall Sin

2016, Vol. 52

Issue (2): 217-223 DOI: 10.11900/0412.1961.2015.00226

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QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH RESOLUTION SYNCHROTRON MICRO-CT

Wen YANG¹,Lifeng ZHANG¹(

),Ying REN¹,Haojian DUAN¹,Ying ZHANG¹,Xianghui XIAO²

1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA

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Wen YANG,Lifeng ZHANG,Ying REN,Haojian DUAN,Ying ZHANG,Xianghui XIAO. QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH RESOLUTION SYNCHROTRON MICRO-CT. Acta Metall Sin, 2016, 52(2): 217-223.

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Abstract

Non-metallic inclusions especially oxides are detrimental to the quality of ferritic stainless steel products. Accurate characterization on inclusions is conducive to further research on the inclusion control. There are some disadvantages in traditional 2D or 3D inclusion detection methods, tomography is thus employed to characterize inclusions in steel in the current work. Oxide inclusions in the slab of Ti bearing ferritic stainless steel were characterized 3 dimensionally using high resolution synchrotron micro computed tomography (Micro-CT), and the variations of quantity, volume and size of oxide inclusions along the thickness of continuous casting slab were analyzed quantitatively and compared with the 2D results detected by ASPEX, an automated scanning SEM. It was found that non-destructive detection could be well done by Micro-CT more accurately. The detected oxides by Micro-CT were mainly global, and the number of inclusions decreased with increasing size. In general, the number density and volume fraction of oxides were largest in the center of slab thickness, and decreased with the distance from center, reached the smallest value near the surface of slab. Contrarily, the average of equivalent diameter of oxide inclusions was largest near slab surface, and was smallest near quarter of thickness on the loose side.

Key words: synchrotron radiation Micro-CT quantitative 3D characterization Ti bearing ferritic stainless steel oxide inclusion continuous casting slab

Received: 17 April 2015

Fund: Supported by National Natural Science Foundation of China (Nos.51274034, 51334002 and 51404019)

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	Wen YANG
	Lifeng ZHANG
	Ying REN
	Haojian DUAN
	Ying ZHANG
	Xianghui XIAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00226 OR https://www.ams.org.cn/EN/Y2016/V52/I2/217

Fig.1 Schematic of apparatus and mechanism of Micro-CT

Fig.2 Schematics of sampling locations in slab

Fig.3 Morphologies and compositions of typical oxide inclusions in the slab of Ti bearing stainless steel

Fig.4 Morphology of inclusions extracted by electrolytic extraction using non-aqueous electrolyte

Fig.5 Morphologies and distributions of oxides in different thickness of slab detected by Micro-CT

Fig.6 Distributions of equivalent diameters (D_E) of oxides in different locations of slab

Fig.7 Variation of number density in volume of oxides along thickness of slab (D_E≥5 μm)

Fig.8 Variation of volume fraction of oxides along thickness of slab (D_E≥5 μm)

Fig.9 Variation of average of equivalent diameter of oxides along thickness of slab (D_E≥5 μm)

Fig.10 Variation of number density in area (a) and area fraction (b) of oxides along thickness of slab detected by ASPEX (≥5 μm)

Fig.11 Variation of average diameter of oxides along thickness of slab detected by ASPEX (≥5 μm)

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