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Mechanism of ferrite grain refinement in the (γ + α) region of weathering steel Cu–P–Cr–Ni–Mo

Published online by Cambridge University Press:  28 August 2015

Chunling Zhang ,
Mengmeng Zhang ,
Tengteng Guo ,
Jinfeng Yang ,
Yuting Kong ,
Dayong Cai  and
Qiang Li
Chunling Zhang*
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China; and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China
Mengmeng Zhang*
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China
Tengteng Guo
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China
Jinfeng Yang
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China
Yuting Kong
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China
Dayong Cai
Affiliation:
Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China
Qiang Li
Affiliation:
Metallic Material Department, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China
*
a)Address all correspondence to this author. e-mail: zhangchl@ysu.edu.cn
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Abstract

In this study, the mechanism of ferrite grain refinement during warm compression deformation in the (γ + α) region of Cu–P–Cr–Ni–Mo weathering steel was analyzed by optical microscopy and electron backscatter diffraction. Results showed that fine equiaxed ferrite grains surrounded by high-angle boundaries (HABs) formed along the initial boundaries as the strain is increased. As the deformation temperature decreased, some low-angle boundaries shifted to HABs in intragranular ferrite, and ferrite grain refinement was promoted by continuous dynamic recrystallization. Microstructural observations also indicated that the fine ferrite grains of approximately 1.4–3 μm in size can be obtained by deformation at 750 °C with a strain over 0.69 because of ferrite dynamic recrystallization. Moreover, both strain and deformation temperature influenced the ferrite grain size and volume fraction. Thus, the predominant mechanism for ferrite grain refinement in the (γ + α) region was continuous dynamic recrystallization.

Keywords

compression testing(γ + α) regionferrite grain refinementcontinuous dynamic recrystallizationelectron backscatter diffraction
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2508 - 2515
Copyright
Copyright © Materials Research Society 2015 

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