Strengthening and toughening mechanism of coarse-grained heat-affected zone for the Cr-/Mo-free Cu-bearing HSLA steel under high heat input welding conditions

Fu, W.T.; Li, Chengning; Di, Xinjie; Jin, Yaohui; Fu, Kuijun; Gao, Heshan; Fang, Chao; Lou, Siyao; Ding, Taihao; Wang, Dongpo

doi:10.1007/s10853-022-07631-9

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…At present, research on EH690 steel focuses on corrosion fatigue [8][9][10][11][12], welding performance [13,14], and quasi-static mechanical properties [15,16]. All of these studies were conducted under quasi-static conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Plastic Deformation of EH690 Steel with the V-Notch during Falling Weight Impact Based on DIC

Xu,

Shi,

Zhao

2024

Processes

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In this study, a falling weight impact test was conducted on EH690 steel specimens with V-notches using Digital Imaging Correlation (DIC). In conjunction with scanning electron microscopy (SEM), the plastic deformation and crack initiation processes were examined at the notch of the specimen under different impact energies (90 J, 120 J, 135 J and 150 J). ABAQUS was used to simulate the plastic deformation of an EH690 specimen. The results show that the strain at the notch tip experienced some elasticity and yielding as the load increased under different impact energies. The load remains unchanged or decreases slightly when a plastic hinge forms at the tip of the notch. According to the microscopic images, there are three areas on the fracture surface: a fiber area, a radiation area, and a shear lip area. With increasing deformation, a crack source forms in the middle of the V-shaped notch and propagates to the inside and outside surfaces of the sample. Cracks are primarily caused by ductile tears. The use of DIC to analyze the surface strain of EH690 steel specimens was verified by comparing DIC with finite element analysis. Both curves have the same trend and the maximum error in the load-time curve is 9.42%, the maximum error in the displacement–time curve is 5.61%, and the maximum error in the strain-time curve is 10.68%.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Plastic Deformation of EH690 Steel with the V-Notch during Falling Weight Impact Based on DIC

Xu,

Shi,

Zhao

2024

Processes

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“…In Cu-bearing UHS steel, however, the insufficient thermal stability of CRPs is the main drawback [ 3 ]. Coarsening and dissolution of CRPs easily occur, leading to a significant loss of strength [ 18 , 19 ]. In addition, lamellar microstructure has a high density of dislocation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microstructural Evolution in Heat-Affected Zone of Cu-Bearing Ultra-High-Strength Steel with Lamellar Microstructure

Fang

et al. 2023

Materials

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The advanced lamellar microstructure significantly improves the toughness of Cu-bearing ultra-high strength steel by delamination toughening (yield strength: 1370 MPa, impact toughness at -40 °C: 60 J). The lamellar microstructure affects the microstructure evolution of heat-affected zone (HAZ), resulting in separate distributions of lath martensite and granular bainite in the complete austenitizing zone and the formation of cluster fresh martensite in the partial austenitizing zone. The grain refinement and decrease in dislocation density are predominant features, especially for the complete austenitizing zone, where the grain is refined to 4.33 μm, and dislocation density is decreased by 27%. With the degree of austenitizing increase, the dissolution of Cu-rich precipitates (CRPs) aggravates during welding. A small fraction of CRPs in the complete austenitizing zone implies the onset of reprecipitation of CRPs. The reason for softening in HAZ is attributed to a combined effect of granular bainite forming, dislocation density decreasing, and CRPs dissolving. After PWTH, large numbered reprecipitation of coherent CRPs occurs, contributing to the hardness recovery of HAZ. Meanwhile, due to the high density of dislocation of lamellar microstructure inherited by partial austenitizing zone, coarsening of coherent CRPs is easy to occur, and various incoherent structures are observed.

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Investigation on the fatigue crack growth behavior of welded joints in EH690 high-strength marine steel

Shen,

Gao,

Shao

et al. 2024

International Journal of Fatigue

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Strengthening and toughening mechanism of coarse-grained heat-affected zone for the Cr-/Mo-free Cu-bearing HSLA steel under high heat input welding conditions

Cited by 5 publications

References 45 publications

Experimental Study on Plastic Deformation of EH690 Steel with the V-Notch during Falling Weight Impact Based on DIC

Experimental Study on Plastic Deformation of EH690 Steel with the V-Notch during Falling Weight Impact Based on DIC

Characterization of Microstructural Evolution in Heat-Affected Zone of Cu-Bearing Ultra-High-Strength Steel with Lamellar Microstructure

Investigation on the fatigue crack growth behavior of welded joints in EH690 high-strength marine steel

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