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Metals 2016, 6(12), 325;

The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting

1,2,3,* , 1,2
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
School of Metallurgy, Northeastern University, Shenyang 110004, China
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 28 November 2016 / Revised: 15 December 2016 / Accepted: 16 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Alloy Steels)
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The structural evolution and segregation in a dual alloy made by electroslag remelting (ESR) was investigated by various analytical techniques. The results show that the macrostructure of the ingot consists of two crystallization structures: one is a quite narrow, fine, equiaxed grain region at the edge and the other is a columnar grain region, which plays a leading role. The typical columnar structure shows no discontinuity between the CrMoV, NiCrMoV, and transition zones. The average secondary arm-spacing is coarsened from 35.3 to 49.2 μm and 61.5 μm from the bottom to the top of the ingot. The distinctive features of the structure are attributed to the different cooling conditions during the ESR process. The Ni, Cr, and C contents markedly increase in the transition zone (TZ) and show a slight increase from the bottom to the top and from the surface to the center of the ESR ingot due to the partition ratios, gravity segregation, the thermal buoyancy flow, the solutal buoyancy flow, and the inward Lorentz force. Less dendrite segregation exists in the CrMoV zone and the transition zone due to a stronger cooling rate (11.1 and 4.5 °C/s) and lower Cr and C contents. The precipitation of carbides was observed in the ingot due to a lower solid solubility of the carbon element in the α phase. View Full-Text
Keywords: structure; segregation; electroslag remelting; dual alloy; transition zone structure; segregation; electroslag remelting; dual alloy; transition zone

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Liu, Y.; Zhang, Z.; Li, G.; Wang, Q.; Wang, L.; Li, B. The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting. Metals 2016, 6, 325.

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