Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing

Taniguchi, Koichi; Lim, Yong Chae; Flores-Betancourt, Alexis; Feng, Zhili

doi:10.3390/ma13194406

Title: Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing

Journal Article · Fri Oct 02 00:00:00 EDT 2020 · Materials

DOI:https://doi.org/10.3390/ma13194406· OSTI ID:1669766

Taniguchi, Koichi ^[1];

^[2]; Flores-Betancourt, Alexis ^[2];

^[2]

JFE Steel Corporation, Chiba (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Friction stir processing is a novel solid-state process to modify microstructures and their properties by intense, localized plastic deformation. However, little research has been reported for microstructure evolutions of advanced high-strength steels during the process. The present work focuses on the study of transient microstructure changes and local mechanical properties for friction stir spot processed dual-phase (DP) 980 MPa grade steel (DP980) under different peak temperatures. A pinless silicon nitride ceramic tool was used to produce relatively simple material deformation and flow near the tool. Friction stir spot processed steel samples were characterized by optical and electron microscopies. Furthermore, Vickers microhardness and nano-indentation measurements were used to study local mechanical properties for correlation with microstructures. A swallow layer of refined grains (<0.6 µm) was obtained with a low peak temperature (under 400 °C), whereas higher peak temperatures (>Ac₁) led to a change in grain size with different microstructures (fine-grained DP or martensite). Electron back-scattered diffraction characterizations revealed a large deformation in the as-received microstructures (mixture of ferrite and tempered martensite) induced by friction stir spot processing, leading to recrystallization and grain refinement around the stirred zone. Also, nano-indentation measurements showed a higher hardness than the hardness of the as-received DP980. Friction stir processing with different process conditions effectively changed microstructures and local mechanical properties.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); JFE Steel Corporation

Grant/Contract Number:: AC05-00OR22725; NFE-17-06928

OSTI ID:: 1669766

Journal Information:: Materials, Vol. 13, Issue 19; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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advanced high-strength steel
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Title: Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing

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