Effect of crystallographic features on low-temperature fatigue ductile-to-brittle transition for simulated coarse-grained heat-affected zone of bainite steel weld

Wang, Boshi; Chen, Nannan; Cai, Yan; Guo, Wei; Wang, Min

doi:10.1016/j.ijfatigue.2023.107523

Cited by 18 publications

(2 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the CP regions in the G2 grain are inclined to an arrangement with the same coarse Bain groups, which is detrimental to the formation of HAGBs. The HAGBs and arrangements of CP and Bain groups within the grains are associated with variant selection [29][30][31][32]. Based on the actual orientation relationship, the fractions of the variant in the G1 and G2 grains were calculated quantitatively according to the method reported in refs.…”

Section: Resultsmentioning

confidence: 99%

Unraveling the Mechanism of Toughness Fluctuation in Ultra-High-Strength Casing from the Perspective of Crystallography

Gao,

Dong,

et al. 2024

Metals

View full text Add to dashboard Cite

The microstructure and impact toughness in an ultra-high-strength casing were investigated, attempting to reveal the reason for toughness fluctuations along the casing in terms of crystallography. The morphological structures at the head of the casing are lath bainite, while those at the end are granular bainite and lath bainite. The head exhibits a higher density of high-angle grain boundaries dominated by block boundaries and a higher impact toughness than the end, showing an inhomogeneous microstructure and causing toughness fluctuations in the casing. The higher density of block boundaries in the head resulted from weaker variant selection because of its higher cooling rate than the end. Therefore, the underlying reason for the toughness fluctuations lies in the varying densities of the block boundaries along the casing triggered by uneven cooling.

show abstract

Section: Resultsmentioning

confidence: 99%

Unraveling the Mechanism of Toughness Fluctuation in Ultra-High-Strength Casing from the Perspective of Crystallography

Gao,

Dong,

et al. 2024

Metals

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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%.

show abstract

Effect of root pass removal procedures on mechanical and microstructural properties of shielded metal arc welded joints

Khan,

Abas,

Qayyum

et al. 2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Effect of crystallographic features on low-temperature fatigue ductile-to-brittle transition for simulated coarse-grained heat-affected zone of bainite steel weld

Cited by 18 publications

References 58 publications

Unraveling the Mechanism of Toughness Fluctuation in Ultra-High-Strength Casing from the Perspective of Crystallography

Unraveling the Mechanism of Toughness Fluctuation in Ultra-High-Strength Casing from the Perspective of Crystallography

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

Effect of root pass removal procedures on mechanical and microstructural properties of shielded metal arc welded joints

Contact Info

Product

Resources

About