Bainite kinetic energy, activation energy, and tribological behavior of austempered AISI4340 steel

Xue Han; Jiayu Hou; Zhenpu Zhang; Gary C. Barber; Feng Qiu; Fang Chang; Shu-Qing Kou

Journal of Materials Research and Technology (Sep 2021)

Bainite kinetic energy, activation energy, and tribological behavior of austempered AISI4340 steel

Xue Han,
Jiayu Hou,
Zhenpu Zhang,
Gary C. Barber,
Feng Qiu,
Fang Chang,
Shu-Qing Kou

Affiliations

Xue Han: Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun 130025, China; Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, MI 48309, USA
Jiayu Hou: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, MI 48309, USA
Zhenpu Zhang: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, MI 48309, USA
Gary C. Barber: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, MI 48309, USA
Feng Qiu: Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun 130025, China; Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, MI 48309, USA
Fang Chang: Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun 130025, China; Corresponding author.
Shu-Qing Kou: Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun 130025, China; Corresponding author.

Journal volume & issue: Vol. 14
pp. 1473 – 1481

Abstract

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A study has been made of the effect of heat-treatment on the microstructures of commercial quality AISI4340 steel after austenitizing at 1128 K and austempering at temperatures ranging from 561 K to 644 K. The morphologies of the bainite structure were observed after etching using optical microscopy. The “Avrami” equation was used to determine the relationship between the transformed fraction and different austempering temperature. The activation energy was determined by using the “Arrhenius” equation. The results show the bainite sheaves and bainite width grow as the austempering temperature increases. High temperature results in fast bainite transformation and the bainite activation energy is 5.302 × 103 J/mol. The bainite microstructures highly enhanced tribological performance as compared to tempered martensite microstructures at the same hardness.

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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