MICROSTRUCTURE EVOLUTION OF HYPEREUTECTOID STEELS DURING WARM DEFORMATION II. Cementite Spheroidization and Effects of Al

Acta Metall Sin

2009, Vol. 45

Issue (2): 156-160 DOI:

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MICROSTRUCTURE EVOLUTION OF HYPEREUTECTOID STEELS DURING WARM DEFORMATION II. Cementite Spheroidization and Effects of Al

CHEN Wei ¹; LI Longfei ¹; YANG Wangyue ²; SUN Zuqing ¹; ZHANG Yan ¹

1. State Key Laboratory for Advanced Metals and Materials; University of Science and Technology Beijing;Beijing 100083
2. School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083

Cite this article:

CHEN Wei LI Longfei YANG Wangyue SUN Zuqing ZHANG Yan. MICROSTRUCTURE EVOLUTION OF HYPEREUTECTOID STEELS DURING WARM DEFORMATION II. Cementite Spheroidization and Effects of Al. Acta Metall Sin, 2009, 45(2): 156-160.

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Abstract

The effects of Al on the spheroidization of cementite and the formation of ultrafine (α+θ) microstructure of hypereutectoid steel during isothermal spheroidizing and warm deformation were investigated by uniaxial hot compression simulation experiment. The results indicate that during isothermal spheroidizing, the fine grained cementite particles and ferrite are obtained by addition of Al. Ultrafine (α+θ) microduplex microstructures can be formed by warm deformation in a very short time. During warm deformation, the diffusion of carbon and iron atoms are impeded with the addition of Al, the spheroidization of lamellar cementite and the coarsening of cementite particles are retarded. And the re–precipitation of cementite particles in ferrite matrix is also restricted, resulting in a more ultrafine (α+θ) microduplex microstructure.

Key words: hypereutectoid steel warm deformation cementit spheroidization Al

Received: 06 June 2008

ZTFLH:

TG142.1

Fund:

Supported by National Natural Science Foundation of China (No.50471092) and Doctoral Fund of Ministry of Education of China (No.20050008017)

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	CHEN Wei
	LI Long-Fei
	YANG Wang-Yue
	XUN Jie-Qiang
	ZHANG Yan

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I2/156

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