Effect of nitrogen content on the second phase particles in V–Ti microalloyed shipbuilding steel during weld thermal cycling

Shi, Zhongran; Wang, Ruizhen; Su, Hang; Cao, Feng; Wang, Qingfeng; Yang, Chen

doi:10.1016/j.matdes.2016.01.111

Cited by 30 publications

(13 citation statements)

References 17 publications

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“…[3,4] Simultaneously, fine inclusions or precipitates can inhibit austenite grain coarsening and induce intragranular acicular ferrite nucleation, which cannot only improve welding efficiency and reduce cost but also improve the comprehensive mechanical properties of welded joints. [5][6][7] The microstructural evolution behavior, strengthening and toughening mechanism, and welding parameter optimization of the welding heat-affected zone of high-strength steel welded under high heat input have been widely studied. Nevertheless, research on hydrogen diffusion, hydrogen-induced internal friction, and hydrogen embrittlement in the welding heat-affected zone has been nonsystematic and limited.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Diffusion and Hydrogen Embrittlement Failure Behavior of AH36 Marine Steel Subjected to High Heat Input Welding

Zhang

Cui

et al. 2022

steel research int.

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AH36 marine steel processed through high heat-input welding is subjected to microstructural characterization, hydrogen permeation test, internal friction test, and slow strain rate tensile test to reveal its hydrogen diffusion and hydrogen embrittlement failure behaviors. Compared with the base metal, the coarsegrained heat-affected zone (CGHAZ) exhibits a significantly coarsened microstructure and decreased hydrogen trap density, resulting in a high hydrogen diffusion coefficient and short hydrogen permeation time. The presence of hydrogen yields a hydrogen-induced Snoek internal friction peak and promotes the movement of the Snoek-Kê-Köster internal friction peak to the lowtemperature region. In addition, B and Kê peaks, which are not found in the base metal, appear in the CGHAZ. With increasing hydrogen content, the plastic loss and brittle fracture of the AH36 marine steel become increasingly significant, and the hydrogen embrittlement sensitivity of the heat-affected zone increases compared with that of the base metal. The discontinuous yield phenomenon gradually disappears under slow strain rate tension owing to the weak pinning effect of the Cottrell atmosphere on mobile dislocations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusion and Hydrogen Embrittlement Failure Behavior of AH36 Marine Steel Subjected to High Heat Input Welding

Zhang

Cui

et al. 2022

steel research int.

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“…The effects of different composite deoxidizers (V-Ti, Ti-Al (or RE), Ti-Ca, etc.) on the microstructure and properties of HAZ were also studied [48][49][50]. Among them, Xia from Central Iron and Steel Research Institute (CISRI) added trace Mg and Zr to the Ti-treated steel.…”

Section: Development Of Oxide Metallurgy Technologymentioning

confidence: 99%

Oxide Metallurgy Technology in High Strength Steel: A Review

et al. 2022

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Oxide metallurgy technology plays an important role in inclusion control and is also applied to improve the weldability of high strength steel. Based on the requirements of the weldability in high strength steel, the influencing factors of weld heat affected zone (HAZ) as well as the development and application status of oxide metallurgy technology are summarized in this review. Moreover, the advantages and difficulties in the application of rare earth (RE) oxide metallurgy technology are analyzed, combined with the performance mechanism of RE and its formation characteristics of fine and high melting point RE inclusions with distribution dispersed in liquid steel. With the weldability diversities of different high strength steels, the research status of weldability of high strength steel with high carbon equivalent and the effects of RE on the microstructure and properties of HAZ are discussed, and some suggestions about further research in the future are proposed.

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“…Recently, the addition of nitrogen into the V-Ti micro-alloyed steel contributed to the intragranular ferrite transformation of CGHAZ. Shi et al [28,29] conducted a comparison of a simulated CGHAZ microstructure and mechanical properties between V-Ti and V-N-Ti steels. The N-enhanced steel contained numerous (Ti, V) (C, N) particles on which AF nucleates, which led to a lower ductile-brittle transition temperature for the simulated CGHAZ.…”

Section: Introductionmentioning

confidence: 99%

Effect of Welding Heat Input on Microstructure and Impact Toughness in the Simulated CGHAZ of Low Carbon Mo-V-Ti-N-B Steel

Qiao

Fan

Shi

et al. 2021

Metals

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Welding thermal cycles with heat inputs ranging from 25 to 75 kJ/cm were performed on a Gleeble 3500. The impact energy improved significantly (from 10 to 112 J), whereas the simulated coarse-grain heat-affected zone (CGHAZ) microstructure changed from lath bainite ferrite (LBF) and granular bainite ferrite (GBF) + martensite/austenite (M/A) to acicular ferrite (AF) + polygonal ferrite (PF) + M/A as the heat input increased. Simultaneously, the mean coarse precipitate sizes and the degree of V(C,N) enrichment on the precipitate surface increased, which provided favorable conditions for intragranular ferrite nucleation. The Ar3 of CGHAZ increased from 593 °C to 793 °C with increasing heat inputs; the longer high-temperature residence time inhibited the bainite transformation and promoted the ferrite transformation. As a result, acicular ferrite increased and bainite decreased in the CGHAZ. The CGHAZ microstructure was refined for the acicular ferrite segmentation of the prior austenite, and the microstructure mean equivalent diameter (MED) in the CGHAZ decreased from 7.6 µm to 4.2 µm; the densities of grain boundaries higher than 15° increased from 20.3% to 45.5% and significantly increased the impact toughness. The correlation of heat input, microstructure, and impact toughness was investigated in detail. These results may provide new ideas for the development of high welding heat input multiphase steels.

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Effect of nitrogen content on the second phase particles in V–Ti microalloyed shipbuilding steel during weld thermal cycling

Cited by 30 publications

References 17 publications

Hydrogen Diffusion and Hydrogen Embrittlement Failure Behavior of AH36 Marine Steel Subjected to High Heat Input Welding

Hydrogen Diffusion and Hydrogen Embrittlement Failure Behavior of AH36 Marine Steel Subjected to High Heat Input Welding

Oxide Metallurgy Technology in High Strength Steel: A Review

Effect of Welding Heat Input on Microstructure and Impact Toughness in the Simulated CGHAZ of Low Carbon Mo-V-Ti-N-B Steel

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