Bainite kinetic transformation of austempered AISI 6150 steel

Xue Han; Zhenpu Zhang; Yanhao Rong; Steven J. Thrush; Gary C. Barber; Hongyu Yang; Feng Qiu

Journal of Materials Research and Technology (Mar 2020)

Bainite kinetic transformation of austempered AISI 6150 steel

Xue Han,
Zhenpu Zhang,
Yanhao Rong,
Steven J. Thrush,
Gary C. Barber,
Hongyu Yang,
Feng Qiu

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, Michigan, 48309, USA
Zhenpu Zhang: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, Michigan, 48309, USA
Yanhao Rong: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, Michigan, 48309, USA
Steven J. Thrush: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, Michigan, 48309, USA; U.S. Army Combat Capabilities Development Command Ground Vehicle System Center, 6501 East 11 Mile Rd, Warren, Michigan, 48397, USA
Gary C. Barber: Automotive Tribology Center, Department of Mechanical Engineering, School of Engineering and Computer Science, Oakland University, Rochester, Michigan, 48309, USA
Hongyu Yang: 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, Michigan, 48309, USA; Corresponding authors at: School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, P.R. China.
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, Michigan, 48309, USA; Corresponding authors at: School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, P.R. China.

Journal volume & issue: Vol. 9, no. 2
pp. 1357 – 1364

Abstract

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This research studies the kinetic transformation and austempering temperature effect on the morphologies of bainite for AISI 6150 steel. A minimum of 10 different holding times for each austempering temperature were utilized. All the AISI 6150 steel samples with original spheroidal pearlite were austenized at 855 °C for 20 min, followed by a lower temperature salt bath for austempering at various holding times. The hardness for each austempered temperature and holding time was measured, and the microstructures were observed by optical microscopy. The kinetic energy for needle like lower bainite and granular like upper bainite was analyzed by using kinetic transformation equations. The aim of this research was to study the transformation of bainite, in particular lower bainite, to obtain improved mechanical properties and higher ductility of AISI 6150 steel, and then apply AISI 6150 steel to more applications. Keywords: Bainite morphologies, Austempering process, Microstructures, Transformation kinetics, Phase activation energy

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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