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Journal of Iron and Steel Research International

Erschienen in:

23.08.2021 | Original Paper

Influence of coiling temperature on microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti, Mo and V

verfasst von: Zhi-xiang Fu, Geng-wei Yang, Ru-yang Han, Yao-wen Xu, Xin-ping Mao, Si-qian Bao, Gang Zhao

Erschienen in: Journal of Iron and Steel Research International | Ausgabe 3/2022

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Abstract

Influence of coiling temperature (CT) on the microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti, Mo and V was elucidated. The precipitation behavior of nano-sized particles was investigated by theoretical calculation and quantitative analysis. And the results revealed that V-enriched (Ti, Mo, V)C precipitated in the ferrite matrix. As the CT decreased, the site fractions of Ti in (Ti, Mo, V)C changed little, the site fractions of Mo increased, and the site fractions of V decreased accordingly. Moreover, the low CT could refine the microstructure and precipitated particles but suppress the precipitation of (Ti, Mo, V)C particles simultaneously, leading to the volume fraction of (Ti, Mo, V)C significantly decreasing, consequently causing an increment of grain refinement strengthening and a reduction in precipitation hardening. When the CT was 600 °C, the steel characterized by fine polygonal ferrite, a small amount of bainite and nano-sized (Ti, Mo, V)C precipitates exhibited the optimum mechanical properties with the ultimate tensile strength of 870 MPa, yield strength of 807 MPa and elongation to fracture of 17%.

Vorheriger Artikel Hot deformation behavior and processing map of low-alloy offshore steel

Nächster Artikel Surface effect induced phase transformation by Mn removal during annealing and its textures in cold-rolled high manganese transformation-induced plasticity steel

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Titel: Influence of coiling temperature on microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti, Mo and V
verfasst von: Zhi-xiang Fu
Geng-wei Yang
Ru-yang Han
Yao-wen Xu
Xin-ping Mao
Si-qian Bao
Gang Zhao
Publikationsdatum: 23.08.2021
Verlag: Springer Singapore
Erschienen in: Journal of Iron and Steel Research International / Ausgabe 3/2022
Print ISSN: 1006-706X
Elektronische ISSN: 2210-3988
DOI: https://doi.org/10.1007/s42243-021-00645-8

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