N-induced microstructure refinement and toughness improvement in the coarse grain heat-affected zone of a low carbon Mo–V–Ti–B steel subjected to a high heat input welding thermal cycle

Fan, Huibing; Shi, Genhao; Peng, Tong; Wang, Qiuming; Wang, Leping; Wang, Qingfeng; Zhang, Fucheng

doi:10.1016/j.msea.2021.141799

Cited by 20 publications

(10 citation statements)

References 30 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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“…Meanwhile, it was found that some inclusions prompted the formation of acicular ferrite. As shown in Figure 1 b, several acicular ferrite grains emanated from a spherical inclusion, which could prevent or deviate the crack prorogation and improve the toughness [ 21 , 50 ]. High-strength low-alloy (HSLA) steels experience severe grain coarsening and loss of toughness as a consequence of welding heat input, particularly high heat input [ 5 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

et al. 2023

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Oxide metallurgy technology can improve the microstructure of a coarse-grained heat-affected zone (CGHAZ) but introduces extra inclusions. Local corrosion behavior of the CGHAZ of a Zr–Ti–Al–RE deoxidized steel was investigated in this work using theoretical calculations and experimental verification. The modified inclusions have a (Zr–Mg–Al–Ca–RE)Ox core claded by a CaS and TiN shell. CaS dissolves first, followed by the oxide core, leaving TiN parts. This confirms that the addition of rare earth can reduce lattice distortion and prevent a galvanic couple between the inclusions and the matrix, while the chemical dissolution of CaS causes localized acidification, resulting in the pitting corrosion initiation.

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“…Zhang et al observed the orientation relationship (001) α // (110) V(C,N) using HRTEM [30]. Moreover, precipitates between 0.25-0.8 µm support ferrite nucleation very well [33,34]. The precipitate size positively correlates with ferrite nucleation capacity.…”

Section: Effects Of Increasing Heat Input On Simulated Cghaz Microstructuresmentioning

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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N-induced microstructure refinement and toughness improvement in the coarse grain heat-affected zone of a low carbon Mo–V–Ti–B steel subjected to a high heat input welding thermal cycle

Cited by 20 publications

References 30 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

Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

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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