Elucidating the heat input on CGHAZ microstructure and its irregular effect on impact toughness for a novel V–N microalloying weathering steel

Hu, Bing; Shi, Genhao; Wang, Qiuming; Zhao, Liyang; Fan, Huibing; Tang, Yang; Wang, Wei; Wang, Qingfeng; Liu, Riping

doi:10.1016/j.jmrt.2023.07.086

Cited by 9 publications

(5 citation statements)

References 65 publications

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“…The preparation process of the atmospheric corrosion resisting wires was subjected to the forging of welding wire ingots, hot rolling of wire rods (ϕ 6.5 mm), rough drawing (ϕ 5.5 mm), fine drawing (ϕ 4.0 mm), and copper plating. In addition, four pair of plates with dimensions of 32 × 400 × 150 (RD) mm 3 were cut from weathering bridge steel for butt welding; the chemical composition of base metal is shown in Table 2. The symmetrical Double-V type grooves with an angle of 60 • were machined (Figure 1a).…”

Section: Methodsmentioning

confidence: 99%

“…The hard phase M/A constituents and non-metallic inclusions in the microstructure had a significant effect on the crack initiation process [3,40]. Both their hardness values were significantly higher than that of the matrixes, which could easily cause local embrittlement.…”

Section: Effect Of Si Content On Impact Property Of Weld Metalmentioning

confidence: 99%

“…The weathering bridge steels, containing Cu, Cr, and Ni, can attain robust mechanical properties via a thermo-mechanical controlled process, as well as enough atmospheric corrosion resistance by forming a stable rust layer [1][2][3]. Generally, a traditional arc welding process is applied for this type of low-alloy steel structure manufacturing.…”

Section: Introductionmentioning

confidence: 99%

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Evolutions of Microstructure and Impact Toughness of Submerged Arc Weld Metal via Introducing Varied Si for Weathering Bridge Steel

Li,

Hu,

Wang

et al. 2023

Metals

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In this paper, the influence of the silicon (Si) content on microstructure and impact property of submerged arc weld metals (WMs) for weathering bridge steel was clarified. Actual submerged arc welding (SAW) was carried out to produce WMs with 0.18 wt.%, 0.36 wt.%, 0.51 wt.%, and 0.60 wt.% of Si. The low temperature impact property of weld metal was detected, and the weld microstructures were characterized by optical microscopy (OM), scanning and transmission electron microscope (SEM and TEM), and electron backscatter diffraction (EBSD). The results indicate that WMs consist of polygon ferrite (PF), acicular ferrite (AF), granular bainitic ferrite (GBF), and martensite/austenite (M/A) constituents in each Si content. With increasing Si, the proportion of PF increased, while AF and GBF coarsened, the area fraction, fM/A, and the mean size, dM/A, of M/A constituents increased, the number of inclusions decreased, but the size increased. Further, the fraction of high-angle grain boundaries (HAGBs) with the misorientation tolerance angles (MTAs) greater than 15° reduced, while the mean equivalent diameter, MEDMTA≥15°, of ferrite grains with HAGBs increased. Accordingly, the impact toughness of WM was degraded from 108.1 J to 39.4 J with the increase in Si. The increase in M/A constituents and inclusions size reduced the critical fracture stress, thereby formation of larger microcracks and cleavage planes occurred. The reduced HAGBs exhibited a low hindering effect on crack propagation, and, consequently, the impact toughness decreased with increasing Si content.

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Section: Methodsmentioning

confidence: 99%

Section: Effect Of Si Content On Impact Property Of Weld Metalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolutions of Microstructure and Impact Toughness of Submerged Arc Weld Metal via Introducing Varied Si for Weathering Bridge Steel

Li,

Hu,

Wang

et al. 2023

Metals

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“…In addition, VN particles in V-N steel precipitated in the austenite phase, increasing the nucleation position and density of ferrite after phase transformation, laying the foundation for refining the microstructure of the V-N steel. The crystal structure of VN was very close to that of ferrite, which could reduce the interfacial energy of ferrite nucleation, promote the formation of intragranular ferrite (IGF) [27][28][29], and ultimately obtained a uniform and fine microstructure containing precipitated phases.…”

Section: Effect Of V-n Microalloying On Microstructural Evolutionmentioning

confidence: 99%

Relationship between microstructure and mechanical properties of V-N microalloyed high strength ship plate steel

Li,

Zhang

et al. 2024

Mater. Res. Express

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V-N microalloying treatment is an important way to improve the service performance of non-quenched and tempered ship plate steel. Herein, the influence of V(C, N) on the evolution of microstructure and improvement of mechanical properties was studied. In addition, the relationship between microstructure and mechanical properties of V-N microalloyed high strength ship plate steel was revealed. The results showed that the composite addition of V and N not only formed a fine dispersed precipitated phase, but more importantly, significantly refined the ferrite/pearlite microstructure, promoted the formation of intragranular acicular ferrite, increased the proportion of high angle grain boundaries, and decreased the kernel average misorientation value. The optimization of microstructure brought about by V-N microalloying achieved synchronous improvement of strength and cryogenic toughness. The impact energy of V-N microalloying ship plate steel increased from 97 J of V-N-free ship plate steel to 239 J at -40 ℃, and the impact fracture mode changed from brittle quasi-cleavage fracture to microvoid coalescence fracture with a large number of equiaxial dimples.

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“…Considering that the influences of heat inputs on CGHAZ microstructure and the mechanical properties of V-Ti-N microalloyed steels with varied compositions are different, for the V-Ti-N microalloyed weathering steel, there may still be complex connections between the heat inputs and CGHAZ microstructure and mechanical properties. The effect of heat inputs on their CGHAZ impact property was reported by the author [23], because the change in CGHAZ strength can reflect its tendency towards softening and hardening, while also affecting the fatigue performance of the joint [24]. It is necessary to further evaluate the strength of CGHAZ with different E j for V-Ti-N microalloyed weathering steel, and to the authors' knowledge, research on heat inputs and CGHAZ strength has been scarcely reported previously.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Microstructure and Tensile Properties in Simulated CGHAZ of a V-Ti-N Microalloyed Weathering Steel

Hu,

Wang,

Wang

2023

Metals

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The mechanical properties of a coarse-grained heat-affected zone (CGHAZ) are affected by welding thermal cycling with varied heat input (Ej), but its effect on tensile properties is rarely studied. In the present work, Ej = 15, 35, 55, 75 kJ/cm CGHAZ samples were prepared via GleebleTM (St. Paul, MN, USA) for a novel V-Ti-N microalloyed weathering steel. The tensile properties of CGHAZ with varied Ej were evaluated. The results indicated that mixed microstructures dominated by lath bainitic ferrite (LBF) and granular bainitic ferrite (GBF) were obtained at Ej = 15 and 35 kJ/cm, respectively, while a mixed microstructure composed of GBF, intragranular acicular ferrite (IGAF), and polygon ferrite (PF) formed at Ej = 55 and 75 kJ/cm, apart from martensite/austenite (M/A) constituents in each Ej condition. The above variation tendency in the microstructure with the increase in Ej led to coarsening of low-angle grain boundaries (LAGBs) and a decrease in dislocation density, which in turn resulted in a yield strength (YS) decrease from 480 MPa to 416 MPa. The mean equivalent diameter (MED), defined by the misorientation tolerance angles (MTAs) ranging from 2–6°, had the strongest contribution to YS due to their higher fitting coefficient of the Hall–Petch relationship. In addition, the increase in the average size (dM/A) of M/A constituents from 0.98 μm to 1.81 μm and in their area fraction (fM/A) from 3.11% to 4.42% enhanced the strain-hardening stress. The yield strength ratio (YR) reduced as the Ej increased, and the lower density and more uniform dislocations inside the ferrite led to a uniform elongation (uE) increase from 9.5% to 18.6%.

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Elucidating the heat input on CGHAZ microstructure and its irregular effect on impact toughness for a novel V–N microalloying weathering steel

Cited by 9 publications

References 65 publications

Evolutions of Microstructure and Impact Toughness of Submerged Arc Weld Metal via Introducing Varied Si for Weathering Bridge Steel

Evolutions of Microstructure and Impact Toughness of Submerged Arc Weld Metal via Introducing Varied Si for Weathering Bridge Steel

Relationship between microstructure and mechanical properties of V-N microalloyed high strength ship plate steel

Effect of Heat Input on Microstructure and Tensile Properties in Simulated CGHAZ of a V-Ti-N Microalloyed Weathering Steel

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