A Bainite-Ferrite Multi-Phase Steel Strengthened by Ti-Microalloying

Wang, Jianfeng; Li, Guangqiang; Ai-da, Xiao

doi:10.2320/matertrans.m2011009

Cited by 17 publications

(13 citation statements)

References 17 publications

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“…Lath type of microstructures appears as light and dark phase mixture in optical micrograph, whereas their preferential etching contrast is evident in SEM. This sort of microstructural characterization was in accordance with published article on ferrite–bainite steel . The hypothesis was substantiated by micro‐hardness data.…”

Section: Resultssupporting

confidence: 88%

Enhancement of Mechanical Properties in Bainitic Steel Processed from Different Austenitization Temperatures

Mandal

Tewary

Ghosh

2017

steel research int.

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A novel high strength steel has been thermo-mechanically controlled processed (TMCP) with 750 8C finish rolling temperature followed by air cooling. Subsequently, the air-cooled steel is partially and fully austenitised separately prior to isothermal bainitic treatment (IBT) followed by air cooling. TMCP steel reveals a congregation of ferrite-bainitemartensite microstructure resulting in an effective combination of strength and ductility. After IBT, multiphase microstructures comprising ferrite, carbide-free lath microstructure (martensite and bainite), and retained austenite up to 12% are obtained which may be due to combined addition of Si and Al. The attractive combination of yield strength (575-699 MPa), tensile strength (1252-1262 MPa), and total elongation (14-16%), as well as continuous yielding behavior, are suitable for structural and automotive applications.

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Section: Resultssupporting

confidence: 88%

Enhancement of Mechanical Properties in Bainitic Steel Processed from Different Austenitization Temperatures

Mandal

Tewary

Ghosh

2017

steel research int.

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“…Due to this, microstructure gets more refined. These effects were also observed in the studies . At 950 °C finishing rolling temperature the significant amount of upper bainite (UB) appears, and acicular ferrite amount grows in microstructure.…”

Section: Resultssupporting

confidence: 63%

Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

Kabanov

Korpała

Kawalla

et al. 2018

steel research int.

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Two types of pipeline steels differentiated by the content of aluminum and silicon are produced during the pilot plant test with varying rolling temperature and accelerated cooling rate. Microstructures, MA constituent morphology, and mechanical properties of such materials are compared using digital and electron microscopy, tensile, and Charpy impact tests. Results show that low finishing rolling temperature stimulates MA constituent refinement. Cooling rate increase leads to MA constituent amount increase and refinement. Alloying with aluminum significantly stabilizes austenite and leads to MA constituent amount and size increase. Higher MA constituent amount has in most cases positive effect on plasticity without strength and impact toughness degradation.

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“…Trace quantities of Ti or V adding into microalloyed steels can effectively prevent austenitic grain from growing and recrystallization during hot rolling. For many microalloyed steels, especially clean steels, many fine nanoscale TiN, TiC, TiNC, VN, VC, and VNC precipitation have good effects on the strength of steels . Cementite, which is very common in steels, also often occurs in the microalloyed steels .…”

Section: Introductionmentioning

confidence: 99%

Density functional theory study of the influence of Ti and V partitioning to cementite in ferritic steels

Wang

Xie

Zhao

et al. 2014

Physica Status Solidi (b)

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We perform density functional theory calculations to investigate the partitioning behavior of Ti and V between cementite and ferrite. The energetics show that Ti and V partition to cementite. The chemical bonds in Ti-and V-substituted cementite are stronger than that of cementite, and these alloyed cementite are more stable than cementite. Furthermore, the elastic properties of alloyed cementite are investigated.Ferromagnetic Ti-and V-substituted cementite are mechanically stable, but non-magnetic Ti-and V-substituted cementite are mechanically unstable. Ti and V partitioning can enhance the resistance to shear strain, the stiffness and the stability against shear of ferromagnetic cementite. Finally, we present the electronic structures to understand the bonding properties of the alloyed cementite.

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A Bainite-Ferrite Multi-Phase Steel Strengthened by Ti-Microalloying

Cited by 17 publications

References 17 publications

Enhancement of Mechanical Properties in Bainitic Steel Processed from Different Austenitization Temperatures

Enhancement of Mechanical Properties in Bainitic Steel Processed from Different Austenitization Temperatures

Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

Density functional theory study of the influence of Ti and V partitioning to cementite in ferritic steels

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