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Chen, J.H.; Wang, Guozhen; Chen, Yan; Ma, Hang; Zhu, Liang

doi:10.1023/a:1007309017416

Cited by 27 publications

(6 citation statements)

References 9 publications

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“…For grain-size-controlled cleavage, different values of c p have been reported in the literature within the range of (50 to 300) J/m 2 . [7,15,19,30,31,47,48] Hence, the calculated c p values fall within the reported range for grain-size-controlled cleavage. The importance of grain size in controlling cleavage in the present work can also be confirmed by the presence of grain-sized (or pearlite-colony-sized) cracks below the fracture surface (Figures 12(a) through (c)).…”

Section: Role Of Grain Size In Variation In Fracture Stresssupporting

confidence: 83%

“…The width of the active zone during blunt-notch testing is approximately 300 lm; [43,44,48] this is similar to the size of a single-grain-sized band (200 to 300 lm) in the slab-1140 sample. The active zone can, therefore, sample either one grain-sized band completely or sample two grain-sized bands partially (coarse grain or fine grain region); hence, either a grain from the coarse grain region or a sufficiently large grain from the fine grain region can act as the weakest link for cleavage crack propagation.…”

Section: Effect Of Bimodality On Toughness In Tmcr Steelmentioning

confidence: 65%

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Effect of Bimodal Grain Size Distribution on Scatter in Toughness

Chakrabarti

Strangwood

Davis

2009

Metall Mater Trans A

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Blunt-notch tests were performed at À160°C to investigate the effect of a bimodal ferrite grain size distribution in steel on cleavage fracture toughness, by comparing local fracture stress values for heat-treated microstructures with uniformly fine, uniformly coarse, and bimodal grain structures. An analysis of fracture stress values indicates that bimodality can have a significant effect on toughness by generating high scatter in the fracture test results. Local cleavage fracture values were related to grain size distributions and it was shown that the largest grains in the microstructure, with an area percent greater than approximately 4 pct, gave rise to cleavage initiation. In the case of the bimodal grain size distribution, the large grains from both the ''fine grain'' and ''coarse grain'' population initiate cleavage; this spread in grain size values resulted in higher scatter in the fracture stress than in the unimodal distributions. The notchbend test results have been used to explain the difference in scatter in the Charpy energies for the unimodal and bimodal ferrite grain size distributions of thermomechanically controlled rolled (TMCR) steel, in which the bimodal distribution showed higher scatter in the Charpy impact transition (IT) region.

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Section: Role Of Grain Size In Variation In Fracture Stresssupporting

confidence: 83%

Section: Effect Of Bimodality On Toughness In Tmcr Steelmentioning

confidence: 65%

Effect of Bimodal Grain Size Distribution on Scatter in Toughness

Chakrabarti

Strangwood

Davis

2009

Metall Mater Trans A

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“…Based on the Griffith formula (Equation (2)), J.H. Chen et al [42][43][44] put forward three types of critical events for cleavage fracture, which are defined as the most difficult stage of crack formation. The first is crack nucleation as the critical event, the second is the propagation of a second-phase particle-sized crack across the particle/grain boundary into a contiguous matrix as the critical event, and the third is the propagation of a grain-sized crack across the grain/grain boundary into contiguous grains as the critical event.…”

Section: The Effect Of Ferrite Grain Size On Impact Toughness Of the mentioning

confidence: 99%

“…The first is crack nucleation as the critical event, the second is the propagation of a second-phase particle-sized crack across the particle/grain boundary into a contiguous matrix as the critical event, and the third is the propagation of a grain-sized crack across the grain/grain boundary into contiguous grains as the critical event. The criterion of the third critical event [44] is…”

Section: The Effect Of Ferrite Grain Size On Impact Toughness Of the mentioning

confidence: 99%

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Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Yan

Cao

et al. 2020

Materials

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The demand for heat-resistant steel has increased owing to its utility in numerous devices that must withstand high steam pressures and high temperatures, such as turbine rotors and blades in ultra-supercritical power plants. It is inevitable to join heat-resistance steel part by welding method, so it is important to maintain the toughness of the weld metals. In this study, the microstructure, low-temperature impact toughness, and fracture surface of as-welded and post-weld heat treatment (PWHT) of 2.25Cr-1Mo-0.25V weld metal were investigated. The microstructures of the as-welded and PWHT specimens are granular bainite and ferrite, respectively. This work revealed the relationship between effective microstructure nearby crack initiation origin and low temperature impact toughness for both the as-welded and PWHT specimens. The evolution of the microstructure and prior austenite was then investigated using confocal laser scanning microscopy (CLSM) to observe the formation of coarse ferrite grain structures. A suggestion for enhancing the low-temperature toughness was provided based on the effect of adjusting Mn content and forming acicular ferrite.

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Mechanism of Cleavage Fracture of HSLA Steels and TiAl Alloys

Chen¹

2007

Particle and Continuum Aspects of Mesomechanics

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Untitled

Cited by 27 publications

References 9 publications

Effect of Bimodal Grain Size Distribution on Scatter in Toughness

Effect of Bimodal Grain Size Distribution on Scatter in Toughness

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Mechanism of Cleavage Fracture of HSLA Steels and TiAl Alloys

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