Measurement of sensitivity to dynamic strain aging in C–Mn steels by internal friction experiments

Wagner, Danièle; Roubier, Nicolas; Prioul, C.

doi:10.1179/174328406x86155

Cited by 32 publications

(20 citation statements)

References 21 publications

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“…Wagner et al [23] showed that a ferrito-pearlitic steel A48 (with 0.769% Mn, 0.198% C and 0.0083% N) has a higher tensile yield stress at 200 and 300 1C compared to 20 1C. These phenomena occur at the atomic scale and require special means of observations such as a TEM to observe the precipitates formed during deformation and internal friction tests (mechanical spectroscopy) to quantify the distribution of the atoms in solid solution [23]. For these reasons, very few microscopic investigations of ageing dynamics have been undertaken.…”

Section: Microstructural Changesmentioning

confidence: 99%

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

Hor

Morel

Lebrun

et al. 2013

International Journal of Mechanical Sciences

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. During forging and machining manufacturing processes, the material is subject to large strains at high strain rates which provoke local heating and microstructural changes. Modelling of these phenomena requires precise knowledge of the stress-strain constitutive equations for a large range of strains, strain rates and temperatures. An experimental study of the rheology of both hyper-and hypo-eutectoid steels (with different microstructures) over a temperature range from 20 1C to 1000 1C and with strain rates from 10 À2 to 10 5 s À1 has been undertaken. These tests were performed in compression on cylindrical specimens and in shear using hat-shaped specimens. Both a GLEEBLE 3500 thermomechanical testing machine and a Split-Hopkinson Pressure Bar apparatus were used. From these tests, three deformation domains have been identified as a function of the material behaviour and of the changes in the deformed microstructure. Each domain was characterized by its behaviour, including the competition between hardening and softening, strain rate sensitivity on the flow stress and the softening phenomenon (i.e. recrystallisation or recovery, etc.). Finally, based on thermodynamical considerations, the conditions of thermoplastic instability (i.e. shear bands, twinning, heterogeneities, etc.) and microstructural changes are highlighted using process maps of the dissipated power repartition.

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Section: Microstructural Changesmentioning

confidence: 99%

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

Hor

Morel

Lebrun

et al. 2013

International Journal of Mechanical Sciences

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“…The maximum UTS in tensile is located at 265°C. With the evolution of their UTS with temperature, it seems that this steel is not very sensitive to DSA phenomenon [23] (UTS max -UTS min % 80 MPa) compared to our A48 steel (UTS max -UTS min % 150 MPa). The shown results (Fig.…”

Section: Dynamic Strain Aging Effect On the Fatigue Lifementioning

confidence: 88%

“…It seems that solute atoms in ''Cottrell atmospheres'' are responsible for the Lüders strain and Static Strain Aging. On the other hand, it has been demonstrated that in C-Mn steels, it is the free carbon and nitrogen in the interstitial sites which are responsible for Dynamic Strain Aging phenomenon [23] in the majority of the cases.…”

Section: Methodsmentioning

confidence: 98%

“…In C-Mn steels [22], the DSA phenomenon occurs for common strain rate (10 À4 -10 À1 s À1 ) in a temperature range of 150-300°C which makes the observation difficult [9,10]. To measure the sensitivity to DSA, tensile tests and more accurate strain rate sensitivity tests are needed [23] in the temperature domain where DSA occurs. Indeed, inside the DSA domain (in temperature and strain rate), there exists a more restricted domain where the strain rate sensitivity coefficient S ¼ Dr DLog _ e is negative.…”

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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“…A48 steel is a kind of low carbon manganese steel (AFNOR NFA 36205 French Standard) 4 which is used in the feed water line of French nuclear power plants [17]. A 40 mm thick plate undergoes a prior normalization and austenitising heat treatment at 870 followed by air cooling.…”

Section: Materials and Testingmentioning

confidence: 99%

A low cycle fatigue model for low carbon manganese steel including the effect of dynamic strain aging

Zhi

Wagner

Wang

et al. 2016

Materials Science and Engineering: A

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Carbon-manganese steel A48 (French standards) is used in steam generator pipes of the nuclear power plant where it is subjected to the cyclic thermal load. The Dynamic Strain Aging (DSA) influences the mechanical behavior of the steel in low cycle fatigue (LCF) at favorable temperature and strain rate. The peak stress of A48 steel experiences hardening-softening-hardening (HSH) evolution at 200°C and 0.4%s -1 strain rate in fatigue loading. In this study, isotropic and kinematic hardening rules with DSA effect have been modified. The HSH evolution of cyclic stress associated with cumulative plastic deformation has also been estimated.

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Measurement of sensitivity to dynamic strain aging in C–Mn steels by internal friction experiments

Cited by 32 publications

References 21 publications

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

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

A low cycle fatigue model for low carbon manganese steel including the effect of dynamic strain aging

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