Effects of dynamic strain aging on mechanical properties of SA508 class 3 reactor pressure vessel steel

Xu, Shugen; Wu, Xiaohu; Han, En‐Hou; Ke, Wei

doi:10.1007/s10853-009-3381-3

Cited by 24 publications

(5 citation statements)

References 34 publications

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“…The load drop in most cases occurs soon after necking and its magnitude gradually increases to fracture. The observed serrations are similar to the reported [10][11][12] "Type-B serrations" which rise and fall about the general level of the stress-strain curve. This dynamic strain ageing phenomenon most likely involves the locking of dislocations followed by either unlocking of dislocations to allow them to move and/or the creation of new dislocations to allow the further deformation [13,14].…”

Section: Resultssupporting

confidence: 87%

The Effect of Microstructure on Stress-Strain Behaviour and Susceptibility to Cracking of Pipeline Steels

Mustapha

Charles

Hardie

2012

Journal of Metallurgy

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The effect of microstructure on the stress-strain behaviour of pipeline steels was studied. Slow strain rate (2×10-6 s-1) tests were conducted on grade X65 and X100 steels in silicone oil and hydrogen carbonate/carbonate solution. The as-received grade X100 steel at 75°C showed serrated stress-strain curves. The magnitude of the serrations depended upon the strain rate and test temperature. Annealing at 600°C or above removes the serrations, but this increased the susceptibility to transgranular cracking in hydrogen carbonate/carbonate solution at potentials below −800 mV (sce). The removal and reformation of banding in pipeline steels were also studied. Ferrite/pearlite becomes aligned during the hot rolling stage of pipe manufacture and causes directionality in crack propagation and mechanical properties. Heat treatments were carried out which show that banding in grade X65 and X100 can be removed above 900°C. This depends on homogenisation of carbon which also depends on temperature, time, and cooling rate.

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Section: Resultssupporting

confidence: 87%

The Effect of Microstructure on Stress-Strain Behaviour and Susceptibility to Cracking of Pipeline Steels

Mustapha

Charles

Hardie

2012

Journal of Metallurgy

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“…This is the reason that dynamic strain aging occurs in the range of 250 to 350°C, which can intensely promote the interactions of dislocation and point defect, resulting in a remarkable enhancement of deformation resistance. Xu et al [19] also have performed uniaxial tension tests on SA508-3 steel and found that the dynamic strain aging region was in the same temperature range of 250-350°C at a strain rate of 1.2 9 10 -3 s -1 . Similar phenomenon can also be observed in SS304 stainless steel from 400 to 600°C [8].…”

Section: Monotonic Tensile Testsmentioning

confidence: 99%

Ratcheting Behavior of SA508-3 Steel at Elevated Temperature: Experimental Observation and Simulation

Tian

Zhang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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A series of monotonic uniaxial tensile tests, strain-controlled and stress-controlled cyclic tests of SA508-3 steel were conducted from 25 to 350°C. Results showed that the steel exhibited temperature-dependent cyclic softening characteristic and obvious ratcheting behavior, and dynamic strain aging was observed in the range of 250-350°C. Based on experimental observations, a temperature-dependent cyclic plastic constitutive model was proposed by introducing the nonlinear cyclic softening and kinematic hardening rules, and the dynamic strain aging was also considered into the constitutive model. Comparisons between experiments and simulations were carried out to validate the proposed model at elevated temperature.

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“…The onset of the secondary stage of ratcheting strain at 800 o C is at a somewhat smaller strain compared to that at 700 o C. However, fatigue life at 800 o C was reduced to one fifth of that at 700 o C. In our earlier study on the monotonic response of this alloy [15], it was shown that serrated flow prevailed at both 700 o C and 800 o C and that plastic strain to failure wasreduced in this temperature regime. These features in the monotonic tensile tests were attributed to dynamic strain aging [20] a phenomenon associated with the interaction of diffusingsolute atoms with mobile dislocations during plastic deformation and one that depends on deformation rate and temperature. In order to understand the effect of deformation rate on cyclic response within this regime, additional tests were conducted at 800°C using lower frequencies (6 Hz and 2 Hz).…”

Section: Cyclic Tensile Response Of Mo-27at %Rementioning

confidence: 99%

Cyclic tensile response of Mo-27 at% Re and Mo-0.3 at% Si solid solution alloys

Kumar

2016

Materials Science and Engineering: A

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Stress-controlled uniaxial cyclic tensile tests were conducted on binaryMo-27 at.% Reand Mo-0.3at.% Si solid solutions as a function of temperature and comparedagainst the previously reported cyclic response of pure Mo. The Mo-27at.%Re alloy with a recrystallized grain size of ~30 m was evaluated in the temperature range 25 o C to 800°Cat R=0.1 and stress range that was 80% of the ultimate tensile strength (UTS);a peak in fatigue life was observed between 300°C and 500°C. The decrease in fatigue life at the higher temperatures of 700°C and 800°C is attributed to dynamic strain aging.Transmission electron microscopy of the cyclically-deformed alloy revealed parallel bands of dislocation at room temperaturethat transitioned to a uniform cell structure at 500 o C and back to orthogonal planar arrays at800 o C. The as-extruded Mo-0.3at.%Si alloy was evaluated from 25 o C to 1200°C and showed superior fatigue life and ratcheting strain resistance as compared to pure Mo and the Mo-27at.% Re alloy(within the temperature range where data were available for comparison). The superior resistanceis attributed to the high density of dislocations within the material in this mostly unrecrystallized state rather than Si in solid solution. Above 800 o C, the ratcheting strain increases and fatigue lifedecreases rapidly with increasing temperature and is associated with dynamic recovery.

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Effects of dynamic strain aging on mechanical properties of SA508 class 3 reactor pressure vessel steel

Cited by 24 publications

References 34 publications

The Effect of Microstructure on Stress-Strain Behaviour and Susceptibility to Cracking of Pipeline Steels

The Effect of Microstructure on Stress-Strain Behaviour and Susceptibility to Cracking of Pipeline Steels

Ratcheting Behavior of SA508-3 Steel at Elevated Temperature: Experimental Observation and Simulation

Cyclic tensile response of Mo-27 at% Re and Mo-0.3 at% Si solid solution alloys

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