Influence of the Deformation on the Microstructure and Mechanical Properties of TBF Steel

Nam, Nguyen Duong; Dong, Tran Phap; Nam, Tran The; Hai, Nguyen Hoang; Khanh, Pham Mai

doi:10.7736/jkspe.019.054

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Fig. 16 Secondary electron images of the punched specimens [128] In the study by Nguyen et al [155], they presented heat treatment of low Mn steel. The steel is heated to austenite temperature, holding the heat at a particular time to ensure a uniform process.…”

Section: B Mechanical Properties Of Tbf Steelmentioning

confidence: 99%

A Comprehensive Understanding of Bainite Phase Transformation Mechanism in TRIP Bainitic-supported Ferrite Steel

Nguyen,

Nguyen

et al. 2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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Mechanical parts on ships and automobiles are diverse in shape, size, and working conditions. They operate with static, cyclic, and shock loads in various environments at low and high temperatures. Therefore, materials need to be highly durable to ensure the reliability of parts and structures on ships and automobiles. Currently, materials used in the shipbuilding and automotive industry are diverse, and steel is commonly used. Therefore, the shipbuilding and automotive industry requires increasingly higher steel mechanical properties. Among the advanced high-strength steel families, low Mn steels with phase change, thanks to the plastic deformation process, are steel lines with high durability, flexibility, and good fatigue resistance. Therefore, low Mn steel is suitable for manufacturing load-bearing parts that undergo deformation to create the required shape. This work presents general studies on the effects of some elements, such as Mn, Si, and C, on the microstructure and mechanical properties of TRIP steel. This article also presents the mechanism of the phase transformation process of TRIP steel when heated and cooled under some conditions, the thermodynamic basis of the formation of TRIP-type bainitic ferrite steel structure, and the influence of C, Mn, and Si on the formation kinetics of TBF steel structure. Through these review studies, the article synthesizes and identifies a number of phase transformation mechanisms for steel; the influence of certain alloying elements on the microstructure and mechanical properties of steel has been determined.

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Section: B Mechanical Properties Of Tbf Steelmentioning

confidence: 99%

A Comprehensive Understanding of Bainite Phase Transformation Mechanism in TRIP Bainitic-supported Ferrite Steel

Nguyen,

Nguyen

et al. 2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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Elektrik direnç punta kaynağı ile birleştirilen TBF/DP600 çeliklerinin mikroyapı ve mekanik özelliklerinin incelenmesi

Aydın

Yilmaz

Bilici

2022

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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In the study, the effects of welding parameters on microstructure and mechanical properties of electrical resistance spot welded TBF/DP600 steel sheets of 1.2 mm thickness were investigated. TBF steel used in the study was welded both with and without electro-galvanized. Microhardness measurements and tensile shear tests were taken as basis in determining the mechanical properties, while optical microscope was used for microstructural characterization. The nugget size of the spot-welded samples was determined by image processing technique, while the indentation depths at the electrode pressure points of the samples were measured by ultrasonic technique. It was observed from the fusion zone microstructure images that the two steels did not mix completely. Increasing the welding current and welding time increased the mixing ratio in fusion zone, expanded the heat affected zone and increased the nugget size, indentation depth and load bearing capacity. TBF steel was more affected by the thermal cycle during welding than DP600 steel. At high heat input, liquid metal embrittlement based microcrack formations initiating from the surface in the heat affected zone of galvanized TBF steels were observed, while corrosion started rapidly in the welding region of ungalvanized TBF steels. The highest hardness values were observed in ITAB on the TBF steel side. However, a significant softening occurred in the transition zone between the ITAB and base metal on the TBF steel side. The nugget size, indentation depth and load bearing capacity were found to be relatively higher in the galvanized TBF steel group. In dissimilar electrical resistance spot welded TBF/DP600 steel sheets having the same thickness, DP600 steel with lower strength has determined the welding strength. In high heat input during welding process, fractures are of the fusion zone button type with higher welding strength, while fractures are of partial fusion zone button type with lower welding strength in low heat input. If TBF steel is galvanized, relatively higher welding strength was obtained in the welding parameters that provide relatively lower heat input.

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Influence of the Deformation on the Microstructure and Mechanical Properties of TBF Steel

Cited by 2 publications

References 3 publications

A Comprehensive Understanding of Bainite Phase Transformation Mechanism in TRIP Bainitic-supported Ferrite Steel

A Comprehensive Understanding of Bainite Phase Transformation Mechanism in TRIP Bainitic-supported Ferrite Steel

Elektrik direnç punta kaynağı ile birleştirilen TBF/DP600 çeliklerinin mikroyapı ve mekanik özelliklerinin incelenmesi

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