Effects of acicular ferrites on crystallography and incomplete transformation of low-carbon low-alloy steel

Binbin Wu; Zhiquan Wang; Chengjia Shang; Zhigang Yang; Chi Zhang; Maged Elhefnawey; Li Li

Journal of Materials Research and Technology (May 2024)

Effects of acicular ferrites on crystallography and incomplete transformation of low-carbon low-alloy steel

Binbin Wu,
Zhiquan Wang,
Chengjia Shang,
Zhigang Yang,
Chi Zhang,
Maged Elhefnawey,
Li Li

Affiliations

Binbin Wu: International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province (International Cooperation), College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150000, China; Guangdong Laboratory for Materials Science and Technology (Yangjiang Advanced Alloys Laboratory), Yangjiang Branch, Yangjiang, 529500, China; Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China; Corresponding author. International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province (International Cooperation), College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150000, China.
Zhiquan Wang: Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China
Chengjia Shang: Guangdong Laboratory for Materials Science and Technology (Yangjiang Advanced Alloys Laboratory), Yangjiang Branch, Yangjiang, 529500, China; State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
Zhigang Yang: Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Chi Zhang: Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Maged Elhefnawey: Department of Mechanical Engineering, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt
Li Li: International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province (International Cooperation), College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150000, China; Corresponding author.

Journal volume & issue: Vol. 30
pp. 1572 – 1581

Abstract

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In this study, we investigated the effects of acicular ferrite (AF) on the crystallographic and incomplete transformation characteristics of low-carbon low-alloy steel. Intermediate annealing after austenitization induced a transformation yielding AFs, accelerating the isothermal transformation kinetics and regulating the microstructure. This process formed highly dense packet grain boundaries and improved the stability of untransformed austenite. AF formation increased the number of packet interfaces, increasing the crack propagation energy. The reduction and refinement of martensite/austenite (M/A) islands increased the crack nucleation energy. A displacive model was used to fit the transformation kinetics curve, indicating the significant effect of the nucleation rate on the isothermal transformation of the experimental steel at 450, 475, and 500 °C. The findings of this study indicate that nucleation regulation can accelerate transformation kinetics to strengthen and toughen bainitic structures.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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