Transactions of Materials and Heat Treatment

Title：Influence of rare earth slag system on dendrite spacing and inclusions in electroslag ingot for 35CrNi3Mo1V alloy

Authors： Jia Xiaobin1 2 Lei Bingwang1 Zhao Jinhua3 Tu Mingjin1 Yin Ranran1 Gao Meng1

Unit： 1. Inner Mongolia North Heavy Industries Group Corp. Ltd. 2. State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing 3. School of Materials Science and Engineering Taiyuan University of Science and Technology

KeyWords： medium carbon medium alloy steel rare earth slag electric slag remelting secondary dendrite spacing nonmetallic inclusions

ClassificationCode：TF744

year,vol(issue):pagenumber：2025,50(3):58-69

Abstract：

In order to explore the influence laws of rare earth slag system on the microstructure of typical medium carbon medium alloy steel after electroslag remelting, the effects of 37 slag system and rare earth slag system on the secondary dendrite spacing and non-metallic inclusions distribution characteristics of 35CrNi3Mo1V alloy electrode ingots after electroslag remelting were compared. The results show that the average secondary dendrite spacing on the outer surface, 1/4 and center of the electrode ingot treated with rare earth slag system (rare earth ingot) is smaller than that of the electrode ingot treated with 37 slag system (37 ingot). The morphology of non-metallic inclusions in steel can be modified by the rare earth treatment. The non-metallic inclusions of 37 ingot are intermittent rod-shaped, triangular, spherical and large blocks, and the oxide inclusions is formed by the aggregation of multiple ellipsoidal inclusions. Non-metallic inclusions with a size of less than or equal to 4 μm account for about 89.5% of the total inclusions. Non-metallic inclusions of rare earth ingot include rare earth oxides, rare earth sulfides and rare earth oxysulfides. Compared with the inclusions in the original consumable electrode ingot, this type of inclusions has a more regular shape, smaller size and more dispersed distribution. Non-metallic inclusions with a size of less than or equal to 4 μm account for about 100% of the total inclusions.

Funds：

国防基础科研计划（JCKY2022208A002）

作者简介：贾晓斌（1988-），男，硕士，高级工程师 E-mail：814308071@qq.com 通信作者：雷丙旺（1966-），男，博士，正高级工程师 E-mail：leibingwang@163.com

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