Structure of slowly solidified 30Cr2Ni4MoV casting with surface pulsed magneto-oscillation. (October 2015)

• Record Type: Journal Article
• Authors: Zhao, J.; Yu, J.; Li, Q.; Zhong, H.; Song, C.; Zhai, Q.
• Is Part Of: Materials science and technology. Volume 31:Number 13a(2015:Dec.)
• Page Start: 1589
• Page End: 1594
• Publication Date: 2015-10
• Subjects: Surface pulsed magneto-oscillation, -- Low cooling rate, -- Solidification, -- Shrinkage cavity, -- Carbon segregation; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284715Y.0000000040
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : Large scale 30Cr2Ni4MoV ingots play a crucial role in nuclear power plants. Shrinkage and carbon segregation are the most common defects in the manufacture of these large scale ingots. Large scale ingots have very low cooling rates. In the present work, an experimental method was employed to achieve similarly low cooling rates with the aim of simulating the solidification process of large ingots in smaller 30Cr2Ni4MoV ingots.Thus, we examined the effect of surface pulsed magneto-oscillation (SPMO)on solidification structure in a laboratory setting. Our experimental results showed an SPMO treated ingot with less carbon segregation and a smaller shrinkage cavity than in an untreated one. Finally, the action mechanism was analysed by numerical simulation.