Distribution Characteristics of Inclusions in GH4742 Superalloy Ingot by Vacuum Arc Remelting

Yang Shulei; Wang Xiwei; Tian Qiang; Wang Tiantian; Yang Shufeng

doi:10.20057/j.1003-8620.2024-00090

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Distribution Characteristics of Inclusions in GH4742 Superalloy Ingot by Vacuum Arc Remelting

Smelting and Solidification | 更新时间：2025-05-09

- Distribution Characteristics of Inclusions in GH4742 Superalloy Ingot by Vacuum Arc Remelting
- Special Steel Vol. 45, Issue 4, Pages: 61-67(2024)
- 作者机构：
  
  1.北京科技大学冶金与生态工程学院，北京 100083
  2.钢铁研究总院有限公司，北京 100081
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2024-00090
  CLC： TF807
- Received：14 April 2024，
  
  Published：30 July 2024
- 稿件说明：
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杨曙磊,王曦伟,田强等.GH4742合金真空自耗铸锭中夹杂物分布特征[J].特殊钢,2024,45(04):61-67.

Yang Shulei,Wang Xiwei,Tian Qiang,et al.Distribution Characteristics of Inclusions in GH4742 Superalloy Ingot by Vacuum Arc Remelting[J].Special Steel,2024,45(04):61-67.
杨曙磊,王曦伟,田强等.GH4742合金真空自耗铸锭中夹杂物分布特征[J].特殊钢,2024,45(04):61-67. DOI： 10.20057/j.1003-8620.2024-00090.

Yang Shulei,Wang Xiwei,Tian Qiang,et al.Distribution Characteristics of Inclusions in GH4742 Superalloy Ingot by Vacuum Arc Remelting[J].Special Steel,2024,45(04):61-67. DOI： 10.20057/j.1003-8620.2024-00090.

摘要

以

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570 mm的合金锭作为自耗重熔的电极，通过起弧、稳定熔炼和热封顶三个阶段，制备

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660 mm的真空自耗铸锭，熔炼过程共历时860 min。采用场发射电子扫描显微镜和夹杂物自动扫描系统，分析了真空自耗重熔GH4742合金工业铸锭内部及其特征位置（锭冠、搁架、橘皮）处夹杂物的分布规律。结果表明，GH4742合金真空自耗铸锭中夹杂物的类型主要有Ti（C，N）、LaAlO

-Ti（C，N）、Ti（C，N）-（Ti，Nb，Mo）C及LaAlO

-Ti（C，N）-（Ti，Nb，Mo）C四种。夹杂物的尺寸主要以

3 μm的小尺寸夹杂物为主，从中心到边缘夹杂物的尺寸逐渐降低，夹杂物的数量密度逐渐增多。铸锭中部中心处夹杂物的尺寸最大，最大平均尺寸为4.14 μm。铸锭底部中心处的夹杂物数量最少，数量密度为13.23个/mm

。铸锭锭冠、橘皮及搁架处分布着聚集的氧化物夹杂，这是电极上脱落的氧化物在熔池流动作用下运动到铸锭边缘，被边缘凝固区域捕捉形成的。

Abstract

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570 mm alloy ingot was utilized as the electrode for vacuum arc remelting， and a

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660 mm vacuum arc remelting ingot was prepared through the three stages of arc initiation， stabilized melting， and thermal capping. The melting process lasted a total of 860 minutes.The distribution of inclusions in

the industrial ingot of vacuum arc remelting GH4742 alloy and its characteristic positions （crown， shelf and skin） was analyzed by field emission scanning electron microscope and inclusion automatic scanning system. The results of the study showed that there were four main types of inclusions in GH4742 alloy vacuum arc remelting ingots， including Ti（C，N）， LaAlO

-Ti（C，N）， Ti（C，N）-（Ti，Nb，Mo）C， and LaAlO

-Ti（C，N）-（Ti，Nb，Mo）C. The size of inclusions was mainly dominated by small-sized inclusions less than 3 μm. From the center to the edge， the size of inclusions gradually decreased and the number density gradually increased. The largest size of inclusions was observed at the middle center of the ingot， with a maximum average size of 4.14 μm. The lowest number of inclusions was observed at the bottom center of the ingot with a number density of 13.23 N/mm

. The aggregated oxide inclusions were distributed in the ingot crown， skin and shelf， which were formed when the oxides dislodged from the electrodes move to the edges of the ingot under the action of the flow field of the molten pool and are captured by the solidified regions at the edges.

关键词

Keywords

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