Effect of Chromium Quality on Inclusions in GH4169 Ingot

doi:10.11901/1005.3093.2021.535

Chinese Journal of Materials Research

2023, Vol. 37

Issue (2): 136-144 DOI: 10.11901/1005.3093.2021.535

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Effect of Chromium Quality on Inclusions in GH4169 Ingot

FENG Hanxu¹^,², ZHAO Lianxiang³, LIU Enze¹(

), TAN Zheng¹, NING Likui¹, TONG Jian¹, ZHENG Zhi¹, LI Haiying¹, LIU Kai⁴

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Military Representative Office of the Army Equipment Department in Shenyang, Shenyang 110004, China
^4.Maiite (Dalian) Auto Parts Co. Ltd., Dalian 116000, China

Cite this article:

FENG Hanxu, ZHAO Lianxiang, LIU Enze, TAN Zheng, NING Likui, TONG Jian, ZHENG Zhi, LI Haiying, LIU Kai. Effect of Chromium Quality on Inclusions in GH4169 Ingot. Chinese Journal of Materials Research, 2023, 37(2): 136-144.

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Abstract

Three kinds of GH4169 alloy ingot were made via vacuum induction melt-casting method with metal block chromium of different quality (i.e. high purity chromium, common chromium and micro-carbon ferrochrome) as raw materials. The characteristics of inclusions in superalloy ingots were investigated by optical microscope (OM) and scanning electron microscope (SEM), and their formation mechanism are analyzed by JMatPro software. It is found that the content of N, P, S and Mn in the ingots decreases with the increase of chromium purity. The types of inclusions in the ingots change to single oxides from oxides, carbonitrides and composite inclusions. The content of carbonitrides and composite inclusions gradually decreases with increasing chromium purity.

Key words: metallic materials GH4169 chromium impurity element inclusion JMatPro software

Received: 16 September 2021

ZTFLH:

TF133

Fund: Liaoning Province Science and Technology Tackling Plan(2019JH2/10100009)

About author: LIU Enze, Tel: (024)23971143, E-mail: nzliu@imr.ac.cn

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	Articles by authors
	Hanxu FENG
	Lianxiang ZHAO
	Enze LIU
	Zheng TAN
	Likui NING
	Jian TONG
	Zhi ZHENG
	Haiying LI
	Kai LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.535 OR https://www.cjmr.org/EN/Y2023/V37/I2/136

Table 1 Actual chemical composition of GH4169 ingot by vacuum induction melting (mass fraction, %)

Fig.1 Macro microstructure and location of sample in GH4169 ingot (a) 1#，(b) 2#，(c) 3#

Table 2 Impurity element contents in Cr (mass fraction, %)

Table 3 Impurity element contents in GH4169 ingots (volume fraction, %)

Table 4 Type and average size of inclusions in GH4169 ingot

Fig.2 Morphology and composition of monolayer inclusions in GH4169 ingot

Fig.3 Morphology and element scanning of composite inclusions in GH4169 ingot (a) (Al, Mg) O - (Ti, Nb) (C, N), (b) (Al, Mg, Ca) O - (Ti, Nb) (C, N)

Fig.4 Aggregation of inclusions in GH4169 (a) 1#, (b) 2#, (c) 3#

Fig.5 Content of top, middle and bottom inclusions in GH4169 ingot

Fig.6 Content of various types of inclusions in GH4169 ingot

Fig.7 Number density of inclusions in GH4169 ingot

Fig.8 JMatPro simulates and calculates the changes of various elements in inclusions (a) M₂O₃, (b) MN

Fig.9 The influence of the elements Al and O on the precipitation content of M₂O₃ inclusions (a) Al content change, (b) O content change

Fig.10 Influence of the elements Ti and N on the precipitation content of MN inclusions (a) Ti content change, (b) N content change

Fig.11 Schematic illustration of the reaction between CaO crucible and alloy liquid and the formation of oxide inclusions

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