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Acta Metall Sin  2017, Vol. 53 Issue (1): 97-106    DOI: 10.11900/0412.1961.2016.00255
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Effect of Electromagnetic Continuous Casting on TiN Distribution and Internal Crack of Incoloy800H Alloy Billet
Fei WANG,Engang WANG(),Peng JIA,Tao WANG,Anyuan DENG
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
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Fei WANG,Engang WANG,Peng JIA,Tao WANG,Anyuan DENG. Effect of Electromagnetic Continuous Casting on TiN Distribution and Internal Crack of Incoloy800H Alloy Billet. Acta Metall Sin, 2017, 53(1): 97-106.

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Abstract  

Incoloy800H is a kind of corrosion-resistant Ni-Cr-Fe base alloy with wide application in industrial fields. Vertical continuous casting process was developed to replace conventional mould casting process to increase product rate and decrease energy consumption. However, seriously internal quality issues of the continuously cast Incoloy800H alloy have been revealed. In this work, the square billet of Incoloy800H alloy, whose cross-sectional size were 100 mm×100 mm, were successfully fabricated in vertical continuous casting process with and without electromagnetic field (EMF), and the solidification structure, TiN inclusion distribution and internal crack were investigated. The result showed, without EMF, the Incoloy800H alloy billet had some seriously internal quality issues like coarse column grains, internal cracks and large TiN inclusion. With EMF, The equiaxed grain ratio of Incoloy800H alloy billet increased from 2.45% to 41.45%, the equiaxed grain size decreased from 10.83 mm to 1.28 mm and internal cracks were eliminated. TiN is a kind of detrimental inclusion in Incoloy800H alloy billet, which can act as stress concentration sites to form cracking. Most of TiN inclusions were located at interdendritic area and formed into TiN cluster to block interdendritic feeding channel. The application of EMF reduced the number of TiN inclusion from 3.71×10-4 μm-2 to 1.59×10-4 μm-2 in the center of billet. Further analysis illustrated that the EMF can refine the equiaxed grain size, reduce the degree of element segregation and the number of large TiN inclusion, which can reduce the probability of the crack initiation and inhibit the formation of TiN cluster to enhance the interdendritic feeding, thereby remarkably reduce the internal crack in Incoloy800H alloy billet.

Key words:  Incoloy800H alloy,      electromagnetic field,      crack,      TiN     
Received:  23 June 2016     
Fund: Supported by National Natural Science Foundation of China (No.50834009), Key Project of Chinese Ministry of Education (No.311014) and Program of Introducing Talents of Discipline to Universities of China (No.B07015)

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00255     OR     https://www.ams.org.cn/EN/Y2017/V53/I1/97

Fig.1  Longitudinal section macrostructure of Incoloy800H alloy billet without electromagnetic field (EMF) (a), SEM images of internal crack (b) and fracture surfaces (c)
Fig.2  Longitudinal section macrostructure (a) and microstructures in the edge (b) and core (c) areas of Incoloy800H alloy billet with EMF
Fig.3  Low (a~c) and high (d~f) magnified OM images of inclusions in Incoloy800H alloy billet without EMF

(a, d) discrete large TiN near the crack (b, e) TiN cluster (c, f) TiN string

Fig.4  Distributions of TiN in Incoloy800H alloy billet without (a, b) and with (c, d) EMF
Fig.5  Variations of the TiN inclusion number along the radius direction of Incoloy800H alloy billet without and with EMF
Fig.6  SEM image of TiN inclusion (a), and EDS analyses of TiN (b) and MgOAl2O3 (c)
Fig.7  Variations of the secondary dendrite arm spacing with the distance from the edge to the centre of specimen without and with EMF
Fig.8  Microsegregation ratio distribution in Incoloy800H alloy billet without and with EMF
Fig.9  Morphologies of three type TiN in Incoloy800H alloy billet with EMF

(a~c) single TiN

(d, e) TiN cluster

(f) TiN cluster in Incoloy800H alloy billet without EMF

(g) TiN string

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