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ChemEngineering 2018, 2(3), 44; https://doi.org/10.3390/chemengineering2030044

Novel formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel

1
Special Material Institute of Inner Mongolia North Heavy Industry Group Corp LTD, Baotou 140332, China
2
Xuanda Metal Research Institute, Xuanda Industrial Group China Co., Ltd., Wenzhou 325105, China
3
Biological Anti Metal Corrosion Program, United Biologics Inc., Oakville, ON L6H 3K4, Canada
*
Author to whom correspondence should be addressed.
Received: 1 August 2018 / Revised: 23 August 2018 / Accepted: 5 September 2018 / Published: 10 September 2018
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Abstract

The ferrite body is the origin of crack and corrosion initiation of steels. Distribution and density of ferrite in seven steel ingots were examined by light optical microscopy and computational modeling, in the study, to explore the correlation of ferrite formation to chemical composition and the mushy zone temperature in ingot forming. The central segregation phenomenon in ferrite distribution was observed in all the examined steel specimens, except 0Cr17Ni4Cu4Nb stainless steel. No significant difference was found in the distribution and density of ferrite among zones of the surface, ½ radius, and core in neither the risers nor tails of 0Cr17Ni4Cu4Nb ingots. Additionally, fewer ferrites were found in 0Cr17Ni4Cu4Nb compared to other examined steels. The difference of ferrite formation in 0Cr17Ni4Cu4Nb elicited a debate on the traditional models explicating ferrite formation. Considering the compelling advantages in mechanical strength, plasticity, and corrosion resistance, further investigation on the unusual ferrite formation in 0Cr17Ni4Cu4Nb would help understand the mechanism to improve steel quality. In summary, we observed that ferrite formation in steel was correlated with the mushy zone temperature. The advantages of 0Crl7Ni4Cu4Nb in corrosion resistance and mechanical stability could be the result of fewer ferrites being formed and distributed in a scattered manner in the microstructure of the steel. View Full-Text
Keywords: ferrite formation; mushy zone temperature; liquidus and solidus temperature; ingot forming; 0Cr17Ni4Cu4Nb stainless steel ferrite formation; mushy zone temperature; liquidus and solidus temperature; ingot forming; 0Cr17Ni4Cu4Nb stainless steel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Han, F.; Yu, H.; Dessau, J.; Chen, X. Novel formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel. ChemEngineering 2018, 2, 44.

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