Nonuniform cleavage cracking across persistent grain boundary

Lu, Weiyi; Chen, J.; Kong, Xiangying; Chakravarthula, S.S.; Qiao, Yu

doi:10.1016/j.mechmat.2011.07.001

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…Other than the ductile to brittle transition zone, the grain boundary deformation length was significantly higher (~3 times) for the sample Q&P-treated at 310°C, in comparison to the sample Q&P-treated at 190°C (Figures 5(d) and (e)). It is reported [34,35] that a higher prior austenite grain boundary deformation during crack propagation leads to a significant increase in the toughness of the material. Hence, an increase in both the ductile to brittle transition zone as well as the prior austenite grain boundary deformation length led to higher impact toughness for sample Q&P-treated at 310°C.…”

Section: Discussionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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The present study demonstrates the role of hot rolling and quench temperature in determining the mechanical properties of low alloy steel processed through quenching and nonisothermal partitioning (Q&P) route. The results indicate that the abrasive wear resistance does not show any significant variation with quench temperature. However, a reduction in tensile strength and an increase in charpy impact toughness and elongation is observed with increasing quench temperature. Interestingly, the retained austenite shows high thermal stability at sub-zero temperature. Furthermore, during deformation through the wear process, the retained austenite experiences the TRIP effect that leads to improvement in wear resistance. The incorporation of hot rolling prior to Q&P led to a significant improvement in strength, energy absorption capability and wear resistance due to a considerable refinement of the microstructural constituents.

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Section: Discussionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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“…The specific role of GBs in affecting cleavage crack growth resistance has not yet been completely clarified. However, recent studies by Qiao [44], Qiao & Argon [45], Qiao & Kong [46], Chen et al [47] and Lu et al [48] should be mentioned.…”

Section: Ii) Partial Dislocationsmentioning

confidence: 94%

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Pineau

2015

Phil. Trans. R. Soc. A.

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The size and the character (low and large angle, special boundaries, tilt and twist boundaries, twins) of the grain boundaries (GBs) in polycrystalline materials influence their strength and their fracture toughness. Recent studies devoted to nanocrystalline (NC) materials have shown a deviation from the Hall-Petch law. Special GBs formed by Σ3 twins in face-centred cubic metals are also known to have a strong effect on the mechanical behaviour of these metals, in particular their work-hardening rate. Grain orientation influences also crack path, the fracture toughness of body-centred cubic (BCC) metals and the fatigue crack growth rate of microstructurally short cracks. This paper deals both with slip transfer at GBs and with the interactions between propagating cracks with GBs. In the analysis of slip transfer, the emphasis is placed on twin boundaries (TBs) for which the dislocation reactions during slip transfer are analysed theoretically, experimentally and using the results of atomic molecular simulations published in the literature. It is shown that in a number of situations this transfer leads to a normal motion of the TB owing to the displacement of partial dislocations along the TB. This motion can generate a de-twinning effect observed in particular in NC metals. Crack propagation across GBs is also considered. It is shown that cleavage crack path behaviour in BCC metals is largely dependent on the twist component of the GBs. A mechanism for the propagation of these twisted cracks involving a segmentation of the crack front and the existence of intergranular parts is discussed and verified for a pressure vessel steel. A similar segmentation seems to occur for short fatigue cracks although, quite surprisingly, this crossing mechanism for fatigue cracks does not seem

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“…Grain boundaries act as natural barriers in cleavage fracture due to differences between the orientations of the cleavage plane in Grain A formed after Stage II and {1 0 0} planes in the neighboring grains [29][30][31][32]. The influence of twist and tilt between the cleavage plane in Grain A and {1 0 0} planes in the neighboring grain should be considered.…”

Section: Propagation Of Cleavage Crack Across Ferrite Grain Boundary mentioning

confidence: 99%

Prediction model on cleavage fracture initiation in steels having ferrite–cementite microstructures – Part I: Model presentation

Shibanuma

Aihara

Suzuki

2016

Engineering Fracture Mechanics

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Nonuniform cleavage cracking across persistent grain boundary

Cited by 8 publications

References 26 publications

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Prediction model on cleavage fracture initiation in steels having ferrite–cementite microstructures – Part I: Model presentation

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