Fracture toughness evaluation of 20MnMoNi55 pressure vessel steel in the ductile to brittle transition regime: Experiment &amp; numerical simulations

Gopalan, A.; Samal, M. K.; Chakravartty, J.K.

doi:10.1016/j.jnucmat.2015.06.009

Cited by 17 publications

(5 citation statements)

References 36 publications

(35 reference statements)

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“…Distinct striations can be seen at the fish-eye surface (Figure 4f). A similar observation was observed by Zhao et al during VHCF deformation of bolt steel [39]. The presence of inclusion was verified in their study at the site of the fish-eye region, which is 350-400 μm (Figure 4g).…”

Section: Fractographysupporting

confidence: 88%

“…(g) A close view of fish-eye morphology, (h) granular bright facet (GBF) region and inclusion morphology, (i) high-resolution image of (h), and (j) fatigue crack propagation region. The fatigue failure was caused by inclusions in a bolt steel (σ a = 600 MPa, N f = 4.38 × 10 8 ) [39] (with permission from Elsevier, 2020).…”

Section: Fractographymentioning

confidence: 99%

“…Crack propagation in ductile metals is a complex multiscale phenomenon governed by the initiation, growth, and coalescence of micro-voids. To observe the crack-branching behavior, the finite element analysis based on the Gurson-Tvergaard-Needleman (GTN) damage model [35][36][37][38][39] was chosen to obtain and monitor the whole crack propagation process in different designed crack-branching models.…”

Section: Finite Element Numerical Calculationmentioning

confidence: 99%

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Fracture Mechanics and Fatigue Design in Metallic Materials

2021

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Section: Fractographysupporting

confidence: 88%

Section: Fractographymentioning

confidence: 99%

Section: Finite Element Numerical Calculationmentioning

confidence: 99%

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Fracture Mechanics and Fatigue Design in Metallic Materials

2021

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“…One such steel is 20MnMoNi55 which after quenching and tempering consists of bainite with cementite (Fe 3 C) and M 2 C precipitates [4]. Significant research has already been documented on different metallurgical aspects (i.e., physical metallurgy, fracture) of pressure vessel steels in the published domain [5][6][7][8][9]. The fracture properties of 20MnMoNi55 grade steel in a temperature regime of − 50 to − 140 °C have been investigated elsewhere [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Das

Kapoor

2019

Metallogr. Microstruct. Anal.

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The present article thoroughly explores the effect of cooling rate on various microstructural features of a reactor pressure vessel steel (20MnMoNi55). For this, dilatometric experiments were performed at different cooling rates. Optical microscopy and electron backscatter diffraction were used to measure different microstructural parameters. Continuous cooling from 0.15 to 0.3 °C/s revealed ferrite and bainite; only bainite is seen from 1 to 2 °C/s, both bainite and martensite were found in the regime 5 to 15 °C/s, and complete martensitic transformation was observed at cooling rate 20 °C/s and above. With increase in cooling rate, the fraction of low angle boundary decreased and that of high angle boundary increased. The nature of grain size distribution was found to be cooling rate sensitive.

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“…Ren 2 carried out tensile tests of a 420-MPa steel with temperature ranging from 0°C down to −90°C and found that the Lüders strain [3][4][5] increased as the temperature decreased. For most structural steels, as the temperature decreases continuously, the fracture behaviour will transform from ductile to brittle (DBT), [6][7][8][9][10][11][12] reducing the steels' ductility and fracture toughness. The DBT occurs when the temperature decreases down to the steel's DBT temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of low‐temperature effect on the fracture locus of a 420‐MPa structural steel with the edge tracing method

Ren

Kristensen

et al. 2018

Fatigue Fract Eng Mat Struct

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Quasi‐static tensile tests with smooth round bar and axisymmetric notched tensile specimens have been performed to study the low‐temperature effect on the fracture locus of a 420‐MPa structural steel. Combined with a digital high‐speed camera and a 2‐plane mirror system, specimen deformation was recorded in 2 orthogonal planes. Pictures taken were then analysed with the edge tracing method to calculate the minimum cross‐section diameter reduction of the necked/notched specimen. Obvious temperature effect was observed on the load‐strain curves for smooth and notched specimens. Both the strength and strain hardening characterized by the strain at maximum load increase with temperature decrease down to −60°C. Somewhat unexpected, the fracture strains (ductility) of both smooth and notched specimens at temperatures down to −60°C do not deteriorate, compared with those at room temperature. Combined with numerical analyses, it shows that the effect of low temperatures (down to −60°C) on fracture locus is insignificant. These findings shed new light on material selection for Arctic operation.

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Fracture toughness evaluation of 20MnMoNi55 pressure vessel steel in the ductile to brittle transition regime: Experiment & numerical simulations

Cited by 17 publications

References 36 publications

Fracture Mechanics and Fatigue Design in Metallic Materials

Fracture Mechanics and Fatigue Design in Metallic Materials

Effect of Cooling Rate on the Microstructure of a Pressure Vessel Steel

Study of low‐temperature effect on the fracture locus of a 420‐MPa structural steel with the edge tracing method

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