Effect of deformation temperature on the ductile–brittle transition behavior of a modified 9Cr–1Mo steel

Chatterjee, A. K.; Chakrabarti, Debalay; Moitra, A.; Mitra, Rahul; Bhaduri, A.K.

doi:10.1016/j.msea.2015.01.076

Cited by 52 publications

(18 citation statements)

References 39 publications

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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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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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“…Presence of dislocation sub‐structure and high fraction of low‐angle boundaries (LAB) with 2–15° misorientation angle possibly damage impact properties, by enhancing the matrix strength and reducing the ability of plastic deformation. On the other hand, presence of large fraction of HAB is effective in resisting the cleavage crack propagation, which is beneficial for the impact toughness …”

Section: Resultsmentioning

confidence: 99%

Effect of Normalizing Temperature on Microstructure and Mechanical Properties of 11Cr–3Co–2.3W Steel

Cui

Gao

Cheng-lin

et al. 2019

steel research int.

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Mechanical properties of 11Cr–3Co–2.3W steel are affected by various parameters, and normalizing temperature is an important parameter. OM, FESEM, EBSD, and TEM are carried out to study the microstructure evolution of 11Cr–3Co–2.3W steel normalized at different temperature ranging from 900 °C to 1150 °C and tempered at 780 °C. The tensile and impact properties are evaluated from the tempered specimens. The results show that an obvious grain coarsening occurs and the tempered strength of 11Cr–3Co–2.3W steel increases with increasing normalizing temperature. The specific strengthening mechanisms are discussed. The fracture morphology shows mainly dimples and cleavage facets, implying mixed‐mode of fracture mechanism when the normalizing temperature is up to 1050 °C. Normalizing at 1150 °C, the mixed‐mode of fracture mechanism is transformed to brittle fracture.

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“…Series of load vs displacement and absorbed energy vs displacement curves obtained by the impact tests of the steel subjected to ausforming and tempforming are shown in Fig. 6 with indication of the characteristic points of general yield load (P GY ), maximum load (P m ), fast fracture load (P F ) and arrest load (P A ) [34][35][36][37][38][39]. The sample subjected to ausforming and tested at room temperature exhibits high V-notch impact adsorbed energy of 140 J.…”

Section: Impact Toughnessmentioning

confidence: 99%

“…The sample subjected to ausforming and tested at room temperature exhibits high V-notch impact adsorbed energy of 140 J. The displacement range exceeds the size of the central portion of the impact specimen that is characteristic of a fracture when the crack propagation path before the separation of the sample into two parts is much larger than the sample thickness [13,[34][35][36][37][38][39]. The arrest load after the fast fracture propagation takes place at a displacement of about 7 mm.…”

Section: Impact Toughnessmentioning

confidence: 99%

Impact toughness of an S700MC-type steel: Tempforming vs ausforming

Dolzhenko

Yanushkevich

Nikulin

et al. 2018

Materials Science and Engineering: A

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A B S T R A C TThe effect of different thermomechanical treatments, i.e., ausforming and tempforming, on the microstructure and mechanical properties including impact fracture behavior of high-strength low-carbon S700MC-type steel was investigated. The tempforming resulted in the development of ultrafine grained elongated grain microstructure with the transverse grain size of 530 nm, whereas the ausforming led to the formation of typical tempered martensite structure with a distance between high-angle boundaries of 1.5 µm. The tempered microstructures involved the formation of carbides with an average particle size about 50 nm and M(C, N)-type carbonitrides with average size of 10 nm. The tempformed steel exhibited the ultimate tensile strength of 1110 MPa and the impact toughness, KCV, above 450 J/cm 2 at a temperature of 293 K, and KCV of 109 J/cm 2 at liquid nitrogen temperature for impact direction perpendicular to rolling plane. In contrast, KCV of the ausformed steel was 180 and 10 J/cm 2 at 293 and 77 K, respectively. The enhancement of toughness was associated with delamination cracks which occurred in the ultrafine elongated grain structure with anisotropic properties.

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Effect of deformation temperature on the ductile–brittle transition behavior of a modified 9Cr–1Mo steel

Cited by 52 publications

References 39 publications

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

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

Effect of Normalizing Temperature on Microstructure and Mechanical Properties of 11Cr–3Co–2.3W Steel

Impact toughness of an S700MC-type steel: Tempforming vs ausforming

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