History effects in metals during constant and variable amplitude testing I: Wavy dislocation glide behaviour

Christ, Hans‐Jürgen; Hoffmann, Gottfried; Öttinger, Oswin

doi:10.1016/0921-5093(95)09782-1

Cited by 34 publications

(15 citation statements)

References 22 publications

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“…Such a pronounced plateau is very infrequently observed (even in case of a single‐phase metal, e.g. copper) as a result of a continuous development in the microstructure 22 . The cyclic softening behaviour at Δɛ/2 = 6.0 × 10 −3 is of similar nature, but the saturation was observed only for a short duration compared to the previous strain amplitude.…”

Section: Resultsmentioning

confidence: 87%

Low cycle fatigue behaviour of duplex stainless steel: influence of isothermal aging treatment

Sahu

Ghosh

Christ

2010

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe low-cycle fatigue behaviour of a duplex stainless steel was comparatively studied in standard heat-treated and isothermally aged (at 475 • C for 100 h) conditions by mechanical testing, scanning and transmission electron microscopy. It was established that fatigue life is longer in the aged condition as compared to the annealed condition at lower values of total strain amplitude ε/2 ( ε/2 = 4.0 × 10 −3 and 6.0 × 10 −3 ) and becomes similar in annealed and aged conditions at ε/2 = 8.0 × 10 −3 . Fatigue resistance of the material converges with increase in ε/2 values as a result of rapid cyclic softening of the ferritic phase in the aged condition.Keywords cyclic softening; duplex stainless steel; 475 • C embrittlement; low-cycle fatigue. N O M E N C L A T U RE c [−] = fatigue ductility exponent K [MPa] = cyclic strength coefficient n [−] = cyclic strain hardening exponent R [−] = load ratio ε [−] = strain ε f [−] = fracture strain ε f [−] = fatigue ductility coefficient ε/2 [−] = total strain amplitude ε el /2 [−] = elastic strain amplitude ε pl /2 [−] = plastic strain amplitude σ [MPa] = stress σ ys(0.2%) [MPa] = 0.2% offset yield strength σ uts [MPa] = ultimate tensile strength σ [MPa] = stress range σ mean [MPa] = mean stress σ /2 [MPa] = stress amplitude ( σ /2) max [MPa] = maximum stress amplitude I N T R O D U C T I O NDuplex stainless steels (DSS) are increasingly used as structural material in oil, power and petrochemical industries. However, the use of these grades of steel is limited to temperatures below 280 • C as they experience embrittlement in the temperature range of 280-500 • C. The iron-chromium binary system has a miscibility gap in this temperature range, and the ferritic phase decomposes into Correspondence: J. K. Sahu.

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Section: Resultsmentioning

confidence: 87%

Low cycle fatigue behaviour of duplex stainless steel: influence of isothermal aging treatment

Sahu

Ghosh

Christ

2010

Fatigue Fract Eng Mat Struct

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“…The LCF specimens machined from the cold-rolled blanks with the exception of the stressrelieved one exhibit cyclic hardening. Hardening in the initial stage of cycling of the cold-deformed materials has been reported also earlier, [6][7][8][9][10] though the mechanisms of hardening have been claimed to be different. Cyclic hardening has generally been attributed to one or more of the following causes: (1) generation of dislocations and their mutual interactions, (2) precipitation of fine carbides during fatigue deformation to restrict the motion of dislocations, and (3) dislocation-solute atom interactions.…”

Section: Discussionmentioning

confidence: 89%

Effect of Cold Rolling on the Coffin–Manson Relationship in Low-Cycle Fatigue of Superalloy IN718

Kumar

Singh

2007

Metall Mater Trans A

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The age-hardenable Ni-Fe-based superalloy IN718 exhibits a dual-slope Coffin-Manson (C-M) relationship during low-cycle fatigue (LCF). Effort was made to eliminate the dual-slope C-M relationship by introducing prior deformation. Peak-aged (PA) material was subjected to different degrees of cold reduction, and its LCF behavior was examined. Cold rolling is found to be highly effective in eliminating the dual slope and enhancing the fatigue life at low strain amplitudes. Cold rolling coupled with stress relieving (SR) treatment is found to further improve the fatigue life. The role of texture on the observed LCF behavior is analyzed and found to have no significant effect.

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“…Christ et al (1995) showed the effect of dislocation arrangements on subsequent fatigue tests. Bocher et al (2001) showed that the over-strengthening due to non-proportional loadings is related to the development of heterogeneous substructures.…”

Section: Introductionmentioning

confidence: 99%

“…To explain the macroscopic deformation mechanisms from a microscopic point of view micro/meso scopic observations have been conducted in recent decades (Doong et al, 1990;Jiao et al, 1995;Christ et al, 1995;Feaugas, 1999;Bocher, L. et al, 2001;Gan et al, 2002;Zisman et al, 2002;El-Madhoun et al, 2003;Jia andFernandes, 2003, Lopes et al, 2003;Haddou et al, 2004;Trivedi et al, 2004, Zuev et al, 2004. Christ et al (1995) showed the effect of dislocation arrangements on subsequent fatigue tests.…”

Section: Introductionmentioning

confidence: 99%

Investigation of subsequent viscoplastic deformation of austenitic stainless steel subjected to cyclic preloading

Mayama

Sasaki

2006

International Journal of Plasticity

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This paper investigates the effects of cyclic preloading on the subsequent viscoplastic deformation. A series of experiments such as the subsequent creep, subsequent stress relaxation, and cyclic loading with strain rate changes after cyclic preloading were conducted with Type 304 stainless steel at room temperature. The cyclic proportional and non-proportional loadings were conducted as cyclic preloadings.Tension-compression loading was chosen as the cyclic proportional loading, and circular and cruciform loading as the cyclic non-proportional loading. The experimental results showed that the subsequent deformation changes with the number of cycles of cyclic preloading. The differences in the subsequent deformation were examined by transmission electron microscopy (TEM). The observations suggest that changes in the dislocation structure depending on the number of cycles of cyclic preloading affect the subsequent viscoplastic deformation.

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History effects in metals during constant and variable amplitude testing I: Wavy dislocation glide behaviour

Cited by 34 publications

References 22 publications

Low cycle fatigue behaviour of duplex stainless steel: influence of isothermal aging treatment

Low cycle fatigue behaviour of duplex stainless steel: influence of isothermal aging treatment

Effect of Cold Rolling on the Coffin–Manson Relationship in Low-Cycle Fatigue of Superalloy IN718

Investigation of subsequent viscoplastic deformation of austenitic stainless steel subjected to cyclic preloading

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