DataVXAdvanced Engineering MaterialsPaper
journal article·2017-03

Mechanism of Dynamic Formation of Ultrafine Ferrite Grains during High Temperature Processing in Steel

Lijia Zhao, Nokeun Park, Yanzhong Tian, Akinobu Shibata, Nobuhiro Tsuji

Advanced Engineering Materials· Volume 19· Issue 3
Publisher page
Source abstract

Abstract

The grain refinement mechanism of ferrite dynamically transformed (DT) from austenite is investigated in a 10Ni–0.1C steel. For decades, it has been debated whether dynamic recrystallization (DRX) contributes to the grain refinement of DT ferrite. Here, the authors show that the role of DRX has been previously underestimated in grain refinement of ferrite and intrinsically it is the DRX that leads to ultra grain refinement of DT ferrite. The DT ferrite shows an unconventional grain growth behavior, that is, grain coarsening at an early stage of transformation with subsequent grain refinement by DRX, which strongly depends on the strain rate. The high strain concentration on fine ferrite grains within the austenite + ferrite structure produced by DT mainly contributes to the occurrence of DRX to form ultrafine‐grained ferrite structures.
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Research context

Metals & alloys

OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metallurgy and Material Forming · Microstructure and mechanical properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Kyoto University Yoshida‐honmachi Sakyo‐ku, Kyoto 606‐8501 Japan

Advanced Steel Processing and Products Research Center, Department of Metallurgical and Materials Engineering Colorado School of Mines Golden CO 80401 USA

School of Materials Science and Engineering Yeungnam University Gyeongsan 712‐749 Republic of Korea

Shenyang National Laboratory for Materials Science Institute of Metal Research, Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 P.R. China

Elements Strategy Initiative for Structural Materials (ESISM) Kyoto University Yoshida‐honmachi Sakyo‐ku, Kyoto, 606‐8501 Japan

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