On the evaluation of the Bauschinger effect in an austenitic stainless steel—The role of multi-scale residual stresses

Hu, Jianan; Chen, Bo; Smith, David J.; Flewitt, Peter E J; Cocks, A.C.F.

doi:10.1016/j.ijplas.2016.05.009

Cited by 59 publications

(53 citation statements)

References 62 publications

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“…Internal resistance is essentially a property, referring to the intrinsic resistance to dislocation motion and thereby the inelastic deformation, thus is not "stress" but "strength". In contrast, internal stress is the residual stress which maintains the material internal self-equilibrium [3,5].…”

Section: Thermodynamicsmentioning

confidence: 99%

“…Multi-scale crystal plasticity self-consistent models [5,6], developed from the length-scale of elementary slip systems to predict the bulk response, characterise the internal resistance in terms of the critical resolved shear strength (CRSS) on the individual slip systems, and the residual stress as a consequence of plastic mismatch (anisotropy) between grains at the meso-scale, as well as interactions between the matrix, dislocations and precipitates at the micro-scale [5]. The model takes into account forest dislocation hardening described by the evolution of the number density of forest dislocation junctions (or dislocation segments between junctions), as well as additional strengthening effects arising from solid solution elements and precipitates.…”

Section: Thermodynamicsmentioning

confidence: 99%

“…Dislocation multiplication during deformation introduces more segments and junctions, leading to a decrease of mean spacing and an increase of CRSS on a slip plane. Details of the model can be found in [5][6][7][8].…”

Section: Thermodynamicsmentioning

confidence: 99%

“…The model has provided a physical interpretation of room temperature experiments of lattice deformation measured by in-situ neutron diffraction [6,9] and the macroscopic Bauschinger effect of plastically pre-strained Type 316H F.C.C. polycrystalline stainless steel [5,10]. As the temperature increases, the kinematics of inelastic deformation may change, where dislocations can recover by climb-controlled network coarsening, a process whereby long segments grow at the expense of shorter ones, leading to a reduction of segments/junctions and an increase in mean spacing, opposite to the multiplication process.…”

Section: Thermodynamicsmentioning

confidence: 99%

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Effect of creep on the Bauschinger effect in a polycrystalline austenitic stainless steel

Cocks

2017

Scripta Materialia

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A combined thermodynamic/kinetic approach is adopted to derive the climbcontrolled recovery of dislocation junctions on individual slip planes in a material during creep when dislocation core diffusion is the rate controlling kinetic process. The model is used in an integrated multi-scale crystal plasticity/creep self-consistent framework to evaluate the effect of creep pre-strain on the Bauschinger effect in a polycrystalline austenitic stainless steel. The model predictions are in good agreement with experimental findings of the effect of tensile creep on the subsequent low temperature response in tension and compression and on the development of residual stresses determined from neutron diffraction studies.

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Section: Thermodynamicsmentioning

confidence: 99%

Section: Thermodynamicsmentioning

confidence: 99%

Section: Thermodynamicsmentioning

confidence: 99%

Section: Thermodynamicsmentioning

confidence: 99%

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Effect of creep on the Bauschinger effect in a polycrystalline austenitic stainless steel

Cocks

2017

Scripta Materialia

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“…It is well evidenced that formation of dislocation cell type structures induces internal stress in the material [13][14][15], and a number of investigations [12,[16][17][18] have been conducted correlating such stresses with the Bauschinger effect. Moreover, a number of semiphenomenological theories [16,[18][19][20][21][22][23][24][25][26] Recently, the contribution of residual lattice stress (also termed type II residual stress, intergranular stress, internal stress, micro residual stress and misfit stress) to the Bauschinger effect has been discussed [32] [33,34]. Lattice residual stress/strain originates due to a combination of elastic and plastic anisotropy of deformation at the grain scale.…”

Section: Many Investigations Have Been Conducted Exploring the Originmentioning

confidence: 99%

Origin of the Bauschinger effect in a polycrystalline material

Mamun

Moat

Kelleher

et al. 2017

Materials Science and Engineering: A

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There is a long and lively debate in the literature about the origin of the Bauschinger effect in polycrystalline materials, the most widely accepted explanation being the easier movement of dislocations during reverse loading causing the reduction of the yield stress. Other explanations include incompatible deformation at the grain scale and change of dislocation cell structures during forward and reverse loading, but recent publications show these phenomenological explanations of the Bauschinger effect are not holistic. In the experimental work presented here, we have investigated the role of micro residual lattice strain on the origin of the Bauschinger effect in type 316H austenitic stainless steel using in-situ neutron diffraction. Standard cylindrical specimens were tensioncompression load cycled at room temperature with the loading interrupted at incrementally larger compressive and tensile strains followed by reloading to the tensile loop peak strain. Mirror symmetric cyclic tests were also performed with tensile and compressive load interruptions followed by compressive reloading to the compressive 2 loop peak strain. A strong correlation is demonstrated between the evolution of residual lattice strain in the grain families and the change in magnitude in macroscopic yield stress, peak stress and the shape of the yielding part of the stress-strain curve for both the cyclic tension yield and compression yield tests. This implies that the residual lattice strain generated by grain scale elastic and plastic deformation anisotropy is the primary source of the Bauschinger kinematic hardening effect observed in type 316H austenitic stainless steel.

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Residual stresses in hot bulk formed parts: microscopic stress analysis for austenite-to-martensite phase transformation

et al. 2021

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In this contribution, the two-scale analysis of residual stress states in a hot bulk formed part with subsequent cooling in the framework of the $$\hbox {FE}^2$$ FE 2 -method is presented. The induction of specific residual stress states in order to improve a component’s properties is an area of current research. In general, residual stresses can be induced inside a component in different ways, e.g., quenching, phase transformation in hot forming processes or dislocation movements. It is widely known that different types of residual stresses can be characterized based on the scale the type acts on. In addition to the macroscopic residual stress analysis, in which residual stresses of first type are considered, this contribution specifically analyzes the microscopic residual stress evolution as a consequence of the cooling of the component.

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On the evaluation of the Bauschinger effect in an austenitic stainless steel—The role of multi-scale residual stresses

Abstract: who died as the result of a tragic climbing accident during the period this paper was in preparation. On the evaluation of the Bauschinger effect in an austenitic stainless steel-The role of multiscale residual stresses

Cited by 59 publications

References 62 publications

Effect of creep on the Bauschinger effect in a polycrystalline austenitic stainless steel

Effect of creep on the Bauschinger effect in a polycrystalline austenitic stainless steel

Origin of the Bauschinger effect in a polycrystalline material

Residual stresses in hot bulk formed parts: microscopic stress analysis for austenite-to-martensite phase transformation

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