Dynamic strain aging in the high-temperature low-cycle fatigue of SA508 Cl. 3 forging steel

Lee, Byung Ho; Kim, In Sup

doi:10.1016/0022-3115(95)00092-5

Cited by 44 publications

(18 citation statements)

References 16 publications

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“…16), but even at a strain rate of 3.2 Â 10 À4 s À1 , the fatigue life is of the same order or higher at 200°C than at RT. This same trend has been observed by Lee and Kim [28] on a SA 508 Cl3 with 0.18% C (the N, Al and Mn contents are not given). From their results, this steel is less sensitive to DSA than our C-Mn steels (only at 300°C a secondary hardening appears).…”

Section: Dynamic Strain Aging Effect On the Fatigue Lifesupporting

confidence: 83%

“…As previously reported in the literature [28], the evolution of the maximum stress with the number of cycles presents a first hardening followed by a stabilization or a second hardening (Figs. 8 and 9).…”

Section: Influence Of the Temperaturementioning

confidence: 53%

“…From Lee [28], the first hardening is caused by cyclic strain hardening and the second hardening is due to dynamic strain aging. Mughrabi [36] reporting some literature results and more particularly those of Weisse [27] explains the DSA effect on the dislocation distribution during the fatigue tests on plain carbon and a-iron.…”

Section: Temperature Effectmentioning

confidence: 99%

“…The results of the DSA effect on LCF behavior in C-Mn and Low Alloyed steels reported in the literature are very confused and contradictory [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels

Huang

Wagner

Bathìas

2015

International Journal of Fatigue

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a b s t r a c tCarbon-Manganese steels and associated welds are commonly used, and sometimes to sustain loads in the Low Cycle Fatigue domain. Nevertheless, the metallurgy of these C-Mn steels is rather complex, due to the interaction of solute atoms (carbon and nitrogen) with dislocations during deformation which leads to metallurgical instabilities: Lüders strain, Static Strain Aging (SSA) and Dynamic Strain Aging (DSA). The DSA phenomenon is an interaction during the test between solute atoms and dislocations which are submitted to an supplementary anchorage if the temperature is sufficient to allow the diffusion of solute atoms leading to a discontinuous plastic deformation localized in bands associated with serrations on the stress-strain curve. In C-Mn, the temperature domain where the phenomenon is present is from 150°C to 300°C. If these metallurgical instabilities induce an increase in hardness, unfortunately they produce a decrease of ductility detrimental to components safety. The results of the DSA effect on LCF behavior in C-Mn and Low Alloyed steels reported in the literature are very confused and contradictories. In this study, two C-Mn steels with a different sensitivity to DSA are investigated in the Low Cycle fatigue domain. As reported from some authors, the fatigue life seems enhance or reduce in the temperature domain where the DSA is maximum, but the decrease of the strain rate always decreases the number of cycles to failure.

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Section: Dynamic Strain Aging Effect On the Fatigue Lifesupporting

confidence: 83%

Section: Influence Of the Temperaturementioning

confidence: 53%

Section: Temperature Effectmentioning

confidence: 99%

“…The results of the DSA effect on LCF behavior in C-Mn and Low Alloyed steels reported in the literature are very confused and contradictory [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels

Huang

Wagner

Bathìas

2015

International Journal of Fatigue

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“…However, the fatigue life of the steel may increase or decrease.32.34 The decreases in fatigue life have been explained on the basis that inhomogeneous plastic deformation results in heavy localized plastic strains, and that restricted plasticity retards blunting of propagating cracks and leads to higher crack growth rates.32 Increases in fatigue life have been attributed to retardation of crack growth rates due to crack branching and suppression of the plastic zone, although formation of cracks is easy in the presence of dynamic strain aging. 34 The data for A516-Gr 70 steel in air at 260°C show that the life of this steel is nearly an order of magnitude longer than that of other carbon steels.47 Significantly long lives at 260°C may be attributed to dynamic strain aging. The results for A302-Gr B steel (Fig.…”

Section: Air Environmentmentioning

confidence: 97%

Environmentally assisted cracking in light water reactors.

Chopra¹,

Chung²,

Clark³

et al. 2007

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The following documents In the NUREG series are available for purchase from the Government Printing Office:formal NRC staff and contractor reports, NRC-sponsored conference proceedings, international agreement reports, grantee reports, and NRC booklets and brochures. Also available a r e regulatory guides, NRC regula- Fatigue tests were conducted on ferritic steels in water that contained various concentrations of dissolved oxygen (DO) to determine whether a slow strain rate applied during different portions of a tensileloading cycle are equally effective in decreasing fatigue life. Crack-growth-rate tests were conducted on compact-tension specimens from several heats of Alloys 600 and 690 in simulated LWR environments. Effects of fluoride-ion contamination on susceptibility to intergranular cracking of high-and commercial-purity Type 304 SS specimens from controlblade absorber tubes irradiated in boiling water reactors were determined in slow-strain-ratetensile tests at 288OC. Microchemical changes in the specimens were studied by Auger electron spectroscopy and scanning electron microscopy to determine whether trace impurity elements may contribute to IASCC of these materials.

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Static and Cyclic Deformation Behavior of the Ferritic Steel 16Mo3 Under Monotonic and Cyclic Loading at High Temperatures

Hoffmann

Biermann

2012

steel research int.

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The ferritic steel 16Mo3 is commonly used for heat exchangers and steam generators. The temperature loading conditions for these applications range typically from 200 to 500°C. For a basic characterization of the steel 16Mo3, the properties were determined by means of tensile tests with different strain rates. At 200 and 300°C, a negative strain‐rate sensitivity was observed which is due to dynamic strain ageing (Portevin–LeChâtelier effect). To characterize the low cycle fatigue (LCF) behavior of this steel, isothermal strain‐controlled LCF tests were carried out at 200 and 500°C at different strain amplitudes. The cyclic stress response curves are showing principally different courses at the investigated temperatures. The stress relaxation behavior was obtained by cyclic load enhancement tests at various strain amplitudes with dwell times of 30 and 120 s.

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Dynamic strain aging in the high-temperature low-cycle fatigue of SA508 Cl. 3 forging steel

Cited by 44 publications

References 16 publications

Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels

Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels

Environmentally assisted cracking in light water reactors.

Static and Cyclic Deformation Behavior of the Ferritic Steel 16Mo3 Under Monotonic and Cyclic Loading at High Temperatures

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