Study on Precipitation Behavior of TiN Particles during Solidification Process of Ti-microalloyed Steels Based on Control of N Content

doi:10.11901/1005.3093.2024.188

Chinese Journal of Materials Research

2024, Vol. 38

Issue (12): 911-921 DOI: 10.11901/1005.3093.2024.188

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Study on Precipitation Behavior of TiN Particles during Solidification Process of Ti-microalloyed Steels Based on Control of N Content

CHEN Ruiyang¹, QIU Xin², DING Hanlin¹(

), WANG Zijian¹, XIANG Chongchen¹

1 School of Iron and Steel, Soochow University, Suzhou 215137, China
2 School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, China

Cite this article:

CHEN Ruiyang, QIU Xin, DING Hanlin, WANG Zijian, XIANG Chongchen. Study on Precipitation Behavior of TiN Particles during Solidification Process of Ti-microalloyed Steels Based on Control of N Content. Chinese Journal of Materials Research, 2024, 38(12): 911-921.

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Abstract

The precipitation behavior of TiN particles during the solidification process of Ti-microalloyed steels with varying N contents was investigated by experimental observations and theoretical analysis. The results indicate that reducing the N content leads to decrease in the number of coarse TiN inclusions precipitated from the liquid phase and changes in the morphology of TiN inclusions, as well as alterations in the driving force for the precipitation and the size of TiN particles precipitated from the solid phase during solidification. Simultaneously, the decrease in N content contributes to the decrease of the volume fraction of TiN particles precipitated from both the liquid and solid phase. It is concluded that the morphology, size and volume fraction of TiN inclusions and precipitated TiN particles within the steel may be controlled by adjusting the N content of Ti-microalloyed steels with a set Ti content.

Key words: metallic materials Ti-microalloyed steel TiN particles solidification segregation precipitation behavior

Received: 25 April 2024

ZTFLH:

TG142.1-3

Fund: National Natural Science Foundation of China(52174367)

Corresponding Authors: DING Hanlin, Tel: (0512)67165762, E-mail: dinghanlin@suda.edu.cn

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	CHEN Ruiyang
	QIU Xin
	DING Hanlin
	WANG Zijian
	XIANG Chongchen

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.188 OR https://www.cjmr.org/EN/Y2024/V38/I12/911

Table 1 Chemical compositions of experimental steels (mass fraction, %)

Fig.1 Metallographic observation and size analysis of second phase particle distribution (a, b, e) S1, (c, f) S2, (d, g) S3

Fig.2 SEM observations and EDS energy spectrum analysis of second-phase particles precipitated from liquid phase in steel (a) S1, (b) S2, (c) S3

Fig.3 Distribution, morphology observation and size analysis of submicron TiN particles in steel (a, d, g) S1, (b, e, h) S2, (c, f, i) S3

Fig.4 Equilibrium relationship between Ti content and N content at different temperatures

Table 2 Parameters used in the solidification process

Fig.5 Relationship between solid phase fraction and solute concentration at solid/liquid interface during equilibrium solidification (a, b) liquid phase solute and solid phase solute of S1 steel, (c, d) liquid phase solute and solid phase solute of S2 steel, (e, f) liquid phase solute and solid phase solute of S3 steel

Fig.6 Relationship between the Ti and N concentration products and the solid phase ratio during the solidification (a, b) Liquid phase and solid phase of S1 steel, (c, d) Liquid phase and solid phase of S2 steel, (e, f) Liquid phase and solid phase of S3 steel

Fig.7 Schematic diagram of TiN particles and TiN inclusion formation during solidification^[30]

Fig.8 TiN size during solidification (a, b) liquid phase TiN inclusion size (c, d) solid phase TiN particle size

Fig.9 Instantaneous precipitation volume fraction of TiN particles at the liquid-solid interface during solidification (a) S1, (b) S2, (c) S3

Table 3 Volume fraction of TiN particles precipitated under equilibrium condition

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