2 edition of formation of sub-grain structure by alternating plastic strain. found in the catalog.
formation of sub-grain structure by alternating plastic strain.
by National Engineering Laboratory,Mechanics and Materials Division in East Kilbride
Written in English
|Series||AB Div. No 23/60|
|Contributions||National Engineering Laboratory. Mechanics and Materials Division.|
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The formation of sub-grain Structure by alternating plastic strain. PM (). Google Scholar A study of slip lines, strain lines and cracks in metals under repeated stress. Univ. of Illinois Bull. Vol. 27 () No. Hertel H. () Entstehung des Ermüdungsschadens. In: Ermüdungsfestigkeit der Author: Heinrich Hertel.
of plastic deformation. The formation of misorientations and physical origin. leads toa structure ofcrystallites within thedeforming grains The present article addresses two questions.
One is the that are bounded by dislocation networks in the form of question for the physical origin of the misorientations.
The. Historical Studies by Polish Scientist on Ultra ﬁ ne-Grained Materials by Severe Plastic Deformation strains around ¤ = 10 With further increase in the strain.
The effect of strain reversal on intensity of grain refinement under severe plastic deformation was studied. The strain reversal did not affect significantly grain refinement and final grain size, but significantly retarded the formation of high angle boundaries in comparison with monotonic by: The formation of subgrains in the course of plastic deformation is explained as a result of a trend to make the deformation easier by locally reducing the number of active slip systems.
Local preference of one slip system changes the crystal orientation with respect to stress (Schmid factor), thus leading to geometrical softening or hardening. The trend to Cited by: To cite this article: J.
Kr atochvíl & M. Kružík () A crystal plasticity model of a formation of a deformation band structure, Philosophical Magazine, DOI: Mechanism of the formation of peripheral coarse grain structure in hot extrusion of AlZn-1Mg A.
Eivani, J. Zhou & J. Duszczyk Philosophical Magazine 96 (12) ()Cited by: 6. This paper is concerned with cyclic stress-strain response of single crystals compared with those of bicrystals and polycrystals under constant plastic strain amplitudes at room temperature.
The cyclic hardening, the cyclic stress-strain curve (CSS curve), the shape change of crystal and the asymmetry of stress have been studied. All journal articles featured in The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics vol 6 issue The phase-field-crystal (PFC) method is used to investigate migration of grain boundary dislocation and dynamic of strain-driven nucleation and growth of deformed grain in two dimensions.
The simulated results show that the deformed grain nucleates through forming a gap with higher strain energy between the two sub-grain boundaries (SGB) which is split from Cited by: 4. The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the s and has shown significant advantages over traditional heat treatment in many aspects.
However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on Cited by: The influence of precipitate state and annealing temperature on the recrystallization of a Mgwt.%Nd alloy has been investigated.
Precipitation kinetics at °C, °C and °C were studied in order to understand precipitate evolution during recrystallization. Precipitation was studied primarily through electrical resistivity measurements, and modelled using a mean Cited by: 1.
PWHT was observed to result in grain coarsening, sub-grain structure formation and decrease of the dislocation density. The increase of impact toughness is attributed to the relieved thermal stress, the inclusions and precipitations, softening of the structure, dislocation recovery and sub-grain structure.
This banner text can have markup. web; books; video; audio; software; images; Toggle navigation. These methods were the elastic-plastic finite-element method (FEM), the Dugdale-type mode, the BCS (Bilby, Cottrell and Swinden) model, and a discrete-dislocation model.
Applications: Nine papers address applications of threshold concepts and endurance limits to aerospace and structural materials. leaving a strain-free recrystallized region behind.
The boundary moves into the grain which contains the high dislocation density in the local region in the second nucleation mechanism, new grain boundaries are formed in region of sharp lattice curvature through sub-grain growth (1).
The mechanism seems to predominate at high. The development of sub-grain microstructures ultimately controls the way in which both steels respond to strain-controlled cyclic plastic loading, but in very different ways. In the case of the 2CrMoNiWV steel at °C, continuous cyclic softening from the first load reversal is the consequence of progressive dynamic recovery and sub-grain growth.
The Basics Of Crystallography And Diffraction - ID:5c14ba8f5af3c. I N T E R N A T I O N A L U N I O N O F C RY S TA L L O G R A P H Y T E X T S O N. LCF Behavior. The cyclic stress response of the 10% Cr steel at °C shown in Fig.
2(a) is strongly dependent on the strain amplitude. The number of cycles to failure decreases from ×10 4 to 2×10 2 as the strain amplitude increases from ± to ±1% (), which is typical for martensitic heat-resistant steels. 10) As with other martensitic steels, 7) the 10% Cr steel Cited by: Full text of "Fundamental aspects of dislocation theory" See other formats.
In this chapter we present an overview of some important concepts related to the processes and microstructural mechanisms that produce the deformation of hysteresis loops and the loss of their symmetry characteristics in ferroelectric, ferroelastic and ferromagnetic systems.
The most discussed themes include: aging and fatigue as primary mechanisms of biased hysteresis Cited by: 5.Metallographic characterization was performed on wrought depleted uranium (DU) samples taken from the longitudinal and transverse orientations from specific locations on two specimens.
Characterization of the samples included general microstructure, inclusion analysis, grain size analysis, and microhardness testing.sub-grain structures to form in the UO 2 grains.
These sub-grain structures appear more readily during high stress and high strain creep tests and form new low angle grain boundaries in the UO 2 [60, 61].
Formation of Gas Bubbles in Materials In nuclear fuel gas atoms from form two sources. The first being the alpha decay of the uraniumFile Size: 4MB.