Effects of microstructure and specimen size on the fracture toughness of EH47 shipbuilding steel at low temperature

Xue, Chunyang; Liu, Yan; Shang, Xinchun; Ren, Xuechong

doi:10.1016/j.engfracmech.2022.108938

Cited by 7 publications

(16 citation statements)

References 55 publications

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“…Then, the rough rolling and finish rolling were carried out on the steel billets in the recrystallized range and non-recrystallized range. 25,26 The temperature of rough rolling was controlled at 1110-1020 C for Process 1 and 1,080-1,000 C for Process 2. The temperature of finish rolling was controlled at 940-820 C for Process 1 and 900-800 C for Process 2.…”

Section: Materials and Rolling Proceduresmentioning

confidence: 99%

“…The largest grain size, average grain size, and the HAGB fraction as well as the misorientation between different grains had been analyzed by the OM and EBSD, respectively. 26 toughness tests were conducted by the dovetail crack arrest (DCA) specimens. In the DCA specimen, a temperature gradient was applied on the specimen surface, which is shown in Figure 2D.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…The fracture toughness testing specimen was 25 mm thick, the ligament length W was 50 mm, the width L = 62. [26][27][28] We used the scanning electron microscope (SEM) to analyze the fracture surface characteristics of the CT specimen tested under various temperatures. 29 Besides, the intersecting surface of the fracture surfaces was observed to determine the brittle crack propagation path.…”

Section: Fracture Toughness and Crack Arrest Toughness Testsmentioning

confidence: 99%

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Effects of rolling process and microstructure on the brittle crack initiation and arrest of a marine steel under low‐temperature

Xue,

Yang,

Liu

et al. 2024

Fatigue Fract Eng Mat Struct

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The effects of the rolling process and microstructure on the brittle crack initiation and arrest of marine steel were systematically investigated. The microstructures of two steel plates produced by different rolling processes were observed and analyzed. The results demonstrated that the rolling process significantly influenced the microstructure. As the rolling temperature decreased, the grain size decreased, the high‐angle grain boundary (HAGB) content increased, and the average grain misorientation angle increased. The brittle crack initiation and the arrest abilities were evaluated by initiation fracture toughness and crack arrest toughness, respectively. The initiation fracture toughness and crack arrest toughness increased with the decreasing grain size and the increasing content of HAGBs. Finally, the influence of microstructure on the brittle crack initiation and arrest ability was explained from two aspects: (1) the critical event of crack initiation at low temperatures, and (2) the hindering effect of HAGB on the propagation of brittle cracks.

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Section: Materials and Rolling Proceduresmentioning

confidence: 99%

Section: Microstructure Characterizationmentioning

confidence: 99%

Section: Fracture Toughness and Crack Arrest Toughness Testsmentioning

confidence: 99%

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Effects of rolling process and microstructure on the brittle crack initiation and arrest of a marine steel under low‐temperature

Xue,

Yang,

Liu

et al. 2024

Fatigue Fract Eng Mat Struct

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“…It can characterize the ability of components with cracks to resist unstable crack propagation. The CTOD test conducted to determine the cryogenic fracture toughness of the joint [7][8][9][10], is a more effective and demanding means to evaluate the reliability of the joint and investigate the crack propagation behavior. Low-temperature CTOD tests conducted on the SA645/AISI304 dissimilar weld can provide a more accurate reflection of its cryogenic toughness, and this is also crucial for studying the crack propagation and low-temperature fracture behavior of the weld.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure heterogeneity on the cryogenic fracture toughness of the dissimilar joint between SA645 and 304L made by laser welding

Zhou,

Wu,

et al. 2023

Mater. Res. Express

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The cryogenic fracture toughness of the SA645/304L dissimilar weld, produced using continuous wave IPG fiber laser welding with a 0.3 mm beam offset towards the 304L side, and the microstructural effects on the fracture behavior were systematically investigated. The weld metal consists of ∼89% columnar dendritic martensite and ∼11% retained austenite (RA), where the ununiform distribution of constituent phases as well as the distinctions between martensite and RA in terms of morphology and mechanical properties lead to the microstructure heterogeneity of weld metal. Pop-in phenomenon appears on the Force-Displacement (F-V) curve during the crack tip opening displacement (CTOD) test for the weld. The CTOD value for the weld is ∼0.057 mm, about 8 times less than that when pop-in effect is ignored (∼0.563 mm). Rapid propagation of the pre-fatigue crack tip along the center of the weld leads to the pop-in phenomenon. Fracture surface in pre-fatigue crack tip (PCT) region shows quasi-cleavage features, while fracture surface in stable crack propagation (SCP) region presents a ductile-fractured surface with dimples. The crack propagation path in SCP region is frequently deflected. Inhibition effect of grain boundaries on crack propagation and TRIP effect of retained austenite (RA) result in the improvement in fracture toughness of the SCP region.

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“…The crack tip opening displacement (CTOD) measures how specimen size and microstructures affect fracture behaviour and toughness. Analysis of the fracture surfaces, metallography, and features of the cleavage starting location revealed that grain size significantly affected the cleavage fracture toughness [36,37].…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimentation crack analysis of annealed TC4 ELI alloy in the room and body fluid environment

Jha

Ajit

2023

Preprint

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A B S T R A C T Simulation and experimentation crack analysis of annealed TC4 ELI alloy in room and body fluid environments are studied in this research work. The crack morphology of the compact-tension specimen is thoroughly investigated. The critical crack size based on the authenticated fracture toughness is preconceived. The crack initiation and growth are performed and analysed at 5 Hz and 10.55 kN fatigue load. The failure mechanisms and microstructural morphology are explored to inspect the fractured surface. The dipped component’s (Body fluid environment) fracture toughness and life are 3.6% and 35%, respectively, less than the undipped sample. The experimental life of the undipped specimen is observed as 26.252 million cycles, whereas for dipped, it is marked as 16.99 million cycles which shows significant degradation of component life.

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Effects of microstructure and specimen size on the fracture toughness of EH47 shipbuilding steel at low temperature

Cited by 7 publications

References 55 publications

Effects of rolling process and microstructure on the brittle crack initiation and arrest of a marine steel under low‐temperature

Effects of rolling process and microstructure on the brittle crack initiation and arrest of a marine steel under low‐temperature

Effect of microstructure heterogeneity on the cryogenic fracture toughness of the dissimilar joint between SA645 and 304L made by laser welding

Simulation and experimentation crack analysis of annealed TC4 ELI alloy in the room and body fluid environment

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