Transactions of Materials and Heat Treatment

Title：Forging surface crack and process improvement on 15CrMnMoVA steel Φ610 mm electroslag ingot

Authors： Wang Fei

Unit： Technology Center Bao Wu Special Metallurgy Co. Ltd.

KeyWords： large shaft forgings microstructure forging dynamic recrystallization numerical simulation

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):34-38

Abstract：

The root cause of round billet surface crack formed in forging and billeting process of 15CrMnMoVA steel Φ610 mm steel ingot was studied by means of optical microscope(OM) and scanning electron microscope(SEM). The results show that there are micro-cracks near the middle and upper part of the ingot before forging and heating, and the combined effect of severe decarburization and Cu-rich phase precipitation near micro-cracks deteriorates the thermoplasticity of the steel ingot surface during the billeting process of the steel ingot when the steel ingot is in the heating homogenization stage for a long time in the heating furnace before forging and billeting. Furthermore, the obvious transverse hot cracks appear near the middle and upper part of the steel ingot during the billeting process of Φ610 mm steel ingot, the decarburization near both sides of the crack is serious, and the liquid film Cu-rich phase appears on the grain boundary near the hot crack. Therefore, by reducing the content of Cu in the mother electrode and prolonging the furnace cooling time of the electrode after electroslag remelting, the surface cracks of the round billet during the forging and billeting process of Φ610 mm steel ingot are effectively eliminated, and the surface quality of the finished bar is improved.

Funds：

王飞（1989-），男，硕士，主任研究员 E-mail：w.fwdd@163.com

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