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microstructural aspects of intergranular and transgranular

(PDF) Fractography of sintered iron and steels Eva

The microfractography of the fracture surface by SEM allows to analyze the exact ductile and brittle failure modes on micro-level as following - ductile fractures (under tensile, shear and bending overload), brittle intergranular fracture mechanism (stress corrosion cracking, liquid metal embrittlement, creep, grain-boundary embrittlement) and brittle transgranular

Aluminum Alloy 7075:The Relation between Microstructure

There is a transition from predominantly transgranular fracture to predominantly intergranular fracture with increasing aging time. Both transgranular and intergranular fracture proceed by dimple rupture processes. The transgranular dimples are nucleated at the interfaces of chromium-rich dispersed particles. Author's personal copy ARTICLE IN PRESSintergranular and transgranular fracture. Results considering both modes of propagation, i.e., a transgranular and intergranular path, reveal that crack-tip shielding is a natural outcome of the cohesive zone approach to fracture. Cohesive zone growth in one mode shields the opposing mode from the stresses required for cohesive zone initiation

Effect of cold drawing ratio on precipitation in

Oct 15, 2014 · Microstructural aspects in Inconel X-750 Thesis/Dissertation Sinha, A K The precipitation hardened Inconel X-750 is extensively used in both PWR and BWR as bolts, pins, spring components, etc., mainly because of this alloy's excellent high temperature strength and good oxidation and corrosion resistance. Effects of RareEarth (RE) Intergranular Adsorption on the Jul 08, 2008 · Silicon nitride powders most often consist primarily of the phase, which transforms into the phase during the densification and microstructural evolution of Si 3 N 4 ceramics. The temperature at which the transformation initiates in the presence of a combination of MgO and RE 2 O 3 densification additives is found to decrease with increasing atomic

Materials Free Full-Text Molecular Dynamics Studies of

In the current study, the effect of hydrogen atoms on the intergranular failure of -iron is examined by a molecular dynamics (MD) simulation. The effect of hydrogen embrittlement on the grain boundary (GB) is investigated by diffusing hydrogen atoms into the grain boundaries using a bicrystal body-centered cubic (BCC) model and then deforming the model with a uniaxial tension. Mechanisms of brittle intergranular fracture in Al-Li This article addresses the microstructural aspects of strengthening a metal together with improving its trade-off properties of ductility, formability and conductivity. transgranular and

Micromechanical Boundary Element Modelling of

In this paper a cohesive formulation is proposed for modelling intergranular and transgranular damage and microcracking evolution in brittle polycrystalline materials. The model uses a multi region boundary element approach combined with a dual boundary element formulation. Polycrystalline microstructures are created through a Voronoi tessellation algorithm. Microstructural Modeling of CSL Grain-Boundary Effects and The combined effects of GB misorientation, structure and geometry, strain hardening, localized plastic shear slip, intensive regions of crystal lattice rotation and the evolution, interaction and accumulation of dislocation densities on the nucleation and growth of intergranular and transgranular failure modes in f.c.c. polycrystalline

Microstructural effects and crack closure during near

A transgranular planar slip during the inception of a microstructure sensitive crack growth is essential to promote intergranular and faceted fracture. The occurrence of a maximum in the fraction of intergranular fracture during threshold crack growth corresponds to the K value at which the cyclic plastic zone size becomes equal to the prior austenitic grain size. Microstructural effects on the tensile and fracture The tensile properties and fracture behavior of cast aluminum alloys A356 and A357 strongly depend on secondary dendrite arm spacing (SDAS), Mg content, and, in particular, the size and shape of eutectic silicon particles and Fe-rich intermetallics. In the unmodified alloys, increasing the cooling rate during solidification refines both the dendrites and eutectic particles and

Microstructural model of intergranular fracture during

Jun 15, 1996 · A microstructural model of intergranular fracture in textured materials is presented. In this model, the material is represented by a two-dimensional microstructure with non-regular polygonal grains which represents material's texture and grain shape measured in experiments or calculated from Monte Carlo simulations. Microstructure and Properties of Direct-Aged Alloy 625Fracture surfaces contained significant amounts of both intergranular and transgranular fracture. The transgranular regions had a faceted appearance suggesting that hydrogen promotes planar slip and localized cracking along planar slip bands. Facets often extend across a single grain, such that their appearance resembles an intergranular morphology.

Mohsen SANAYEI Master of Science

Microstructural aspects of intergranular and transgranular crack propagation in an API X65 steel pipeline related to fatigue failure we investigated microstructural aspects of intergranular On the toughening of brittle materials by grain bridging intergranular and transgranular fracture. Results considering both modes of propa-gation, i.e., a transgranular and intergranular path, reveal that crack-tip shielding is a natural outcome of the cohesive zone approach to fracture. Cohesive zone growth in one mode shields the opposing mode from the stresses required for cohesive zone initiation.

On the toughening of brittle materials by grain bridging

intergranular and transgranular fracture. Results considering both modes of propagation, i.e., a transgranular and intergranular path, reveal that crack-tip shielding is a natural outcome of the cohesive zone approach to fracture. Cohesive zone growth in one mode shields the opposing mode from the stresses required for cohesive zone initiation Phenomenological aspects of fatigue crack initiation and Apr 01, 1996 · Intergranular cracking was the dominant mode of failure in the potential range from {minus}350 mV to {minus}150 mV, while transgranular cracking took place at potentials > {minus}150 mV.}, doi = {10.5006/1.3293638}, journal = {Corrosion}, number = 4, volume = 52, place = {United States}, year = {Mon Apr 01 00:00:00 EST 1996}, month = {Mon Apr

The Role of Oxygen-Grain-Boundary Diffusion During

cases transgranular crack propagation (Fig. 4c and d). a) b) Fig. 4:Fracture surfaces of the fatigue tests at 650°C in air (a) without hold time, showing striations and (b) with 300s hold time showing deformation-less grain-boundary facets (intergranular fracture), in vacuum testing (p=10-5mbar) showing transgranular fracture mode with Validation of the K and J Parameters in a Compact Tension Methods have been examined to evaluate the fracture mechanics parameters J and K in finite element (FE) analyses on a compact tension, C(T), geometry using a mesh appropriate for the evaluation of both intergranular and transgranular microstructural damage processes. Realistic grain and grain boundary microstructures were modelled using ABAQUS.

of the Mechanics and of

reduction in the strength of interatomic bonds at crack tips is the underlying cause for this intergranular failure process. Nagumo and Matsuda (2002) examined the effect of hydrogen on intergranular fracture of lath martensitic steels, with ten- sile strengths from 1240 to 1260 MPa and differing manganese contents from 0.47 to 1.42 mass%.Micromechanical Aspects of Transgranular and Intergranular Micromechanical Aspects of Transgranular and Intergranular change in the fractal dimension of the fracture surface demonstrates a wavy character and dispersion depending on the microstructural

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