Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation

doi:10.11901/1005.3093.2022.289

Chinese Journal of Materials Research

2023, Vol. 37

Issue (8): 603-613 DOI: 10.11901/1005.3093.2022.289

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Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation

XIONG Shiqi¹^,², LIU Enze¹(

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

^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

Cite this article:

XIONG Shiqi, LIU Enze, TAN Zheng, NING Likui, TONG Jian, ZHENG Zhi, LI Haiying. Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation. Chinese Journal of Materials Research, 2023, 37(8): 603-613.

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Abstract

The microstructural evolution of DZ125L superalloy during solution heat treatment in the range of 1230℃ to 1260℃ was investigated by optical microscope (OM), scanning electron microscope (SEM) and electron probe microanalyser (EPMA). The results show that during solution heat treatment, MC carbide transformed from cursive-script like to granular or short rod like, and the dissolution of γ′ phase in the dendritic core was faster than that in the interdendritic region. The area fraction of γ′ phase and γ/γ′ eutectic decreased, and the average size of γ′ phase in the interdendritic region increased with the increase of heating time at 1240℃ and 1250℃, while the area fraction of γ′ phase and γ/γ′ eutectic, and the average size of γ′ phase in the interdendritic region decreased firstly, then increased, and decrease lastly at 1230℃. The abnormal increase of area fraction of γ′ phase and γ/γ′ eutectic during solution heat treatment at 1230℃ was caused by the rapid dissolution of γ′ phase in the dendritic core, which led to the diffusion of Ta from dendrite core to interdendritic region through γ matrix.

Key words: metallic materials DZ125L superalloy solution heat treatment microstructure γ′ phase γ/γ′ eutectic

Received: 23 May 2022

ZTFLH:

TG142

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

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	XIONG Shiqi
	LIU Enze
	TAN Zheng
	NING Likui
	TONG Jian
	ZHENG Zhi
	LI Haiying

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.289 OR https://www.cjmr.org/EN/Y2023/V37/I8/603

Table 1 Mass fraction of DZ125L superalloy (mass fraction,%)

Fig.1 Microstructure of the as-cast DZ125L superalloy (a) dendritic structure, (b) γ' phase at dendrite core, (c) γ' phase at interdendrite, (d) γ/γ' eutectic, (e) carbide

Table 2 Mass fraction of γ/γ' eutectic and MC carbide of the as-cast DZ125L superalloy tested by EDS (mass fraction,%)

Fig.2 DSC heating curve of the as-cast DZ125L superalloy

Fig.3 Microstructure of the as-cast DZ125L superalloy at 1280℃ (a), 1290℃ (b), 1300℃ (c) keeping for 15 mins and then quenched in water

Fig.4 Morphologies and EDS mapping results of MC carbide after solution heat treatment (1250℃ for 2 h) (a) and (b) morphologies of MC carbide, (c) Ti, (d) Ta, (e) Cr, (f) W

Fig.5 Microstructure of DZ125L superalloy after solution heat treatment (a-1) to (a-4) 1230℃ from 1 h to 8 h, (b-1) to (b-4) 1230℃ from 1 h to 8 h, (c-1) to (c-4) 1250℃ from 1 h to 8 h, (d-1) to (d-3) 1260℃ from 1 h to 4 h

Fig.6 Area fraction of γ' phase and average size of γ $p'$ phase after solution heat treatment

Fig.7 Evolution of γ' phase size distribution as a fuction of time at (a) 1230℃, (b) 1240℃, (c) 1250℃

Fig.8 Morphologies of γ' phase after solution heat treatment: (a) 1240℃ for 1 h, (b) 1250℃ for 1 h

Fig.9 Morphologies of γ/γ' eutectics after solution heat treatment (a) 1230℃ for 1 h, (b) 1230℃ for 2 h, (c) and (d) 1240℃ for 4 h, (e) 1250℃ for 2 h

Fig.10 Area fraction of γ/γ' eutectic after solution heat treatment

Fig.11 Homogenization kinetic curves of Ti (a) and Ta (b)

Fig.12 Segregation coefficient curve of Ta element in γ matrix at 1230℃

Fig.13 Shematic illustration of the abnormal increase in area fraction of γ' phase and γ/γ' eutectic during solution heat treatment at 1230℃

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