Microstructure and mechanical properties of a Ti-microalloyed low-carbon stainless steel treated by quenching-partitioning-tempering process

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.03.025· OSTI ID:22587156

Liu, Z. Y. ^[1]; Wang, Z. ^[2]; Wang, G. D. ^[1]

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1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819 (China)
2. Research Institute, Baoshan Iron & Steel Co. Ltd., Shanghai 201900 (China)

Quenching-partitioning-tempering (Q-P-T) process was used to treat a Ti-microalloyed low-carbon stainless steel after cold rolling. In addition to martensite, ferrite and retained austenite, TiN, coarse TiC, fine TiC, (Fe,Cr){sub 3}C and ultra-fine TiC precipitates were formed after the Q-P-T treatment. Based on field emission-scanning electron microscope (FESEM) and transmission electron microscope (TEM) observations, thermodynamic, crystallographic and statistical analyses were used to reveal the precipitation behaviors of these particles. The effects of partitioning-tempering (P-T) temperature and time on the microstructure and mechanical properties of Q-P-T treated specimens were specially studied. The coarsening and spheroidization of (Fe,Cr){sub 3}C particles during P-T stage were obviously retarded by large Cr addition. The retained austenite was obtained significantly with appropriate P-T parameters. The precipitation of ultra-fine TiC particles in the martensite during the P-T stage at 500 °C induced a secondary hardening. - Highlights: • Some fine TiC with 30–70 nm precipitated in austenite during partial austenization. • A part of fine TiC had K-S OR with martensite after Q-P-T treatment. • A part of fine TiC had a OR specially deviating from K-S OR with martensite. • Coarsening and spheroidization of (Fe,Cr){sub 3}C were retarded during P-T stage. • Ultra-fine TiC with < 10 nm precipitated in martensite during P-T stage at 500 °C.

• OSTI ID: 22587156
• Journal Information: Materials Characterization, Vol. 116; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
AUSTENITE
CRYSTALLOGRAPHY
ELECTRON SCANNING
FERRITE
HARDENING
MARTENSITE
MECHANICAL PROPERTIES
MICROSTRUCTURE
PRECIPITATION
QUENCHING
ROLLING
SCANNING ELECTRON MICROSCOPY
STAINLESS STEELS
TEMPERING
TITANIUM CARBIDES
TITANIUM NITRIDES
TRANSMISSION ELECTRON MICROSCOPY