Fracture of High-Strength Materials

Tetelman, A. S.; McEvily, A.J.

doi:10.1016/b978-0-12-449706-1.50008-1

Cited by 107 publications

(132 citation statements)

References 10 publications

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“…The degree of brittleness of a material is intimately connected with the relaxation process that occurs at the crack-tip. When hard non-metallic particles, such as carbides or precipitates along the PPB, which tend to lead to interface decohesion, are dispersed in HIPed superalloys 27) , the process of crack nucleation at the grain boundary takes place more easily at 650 C. Due to the interface between incoherent particles and matrix, the interface becomes a preferred site for crack initiation 28) . Furthermore, these brittle particles do not permit enough relaxation at the tip of the crack as a result of dislocation slip so that the relaxation process that occurs in crack nucleation is limited 27) .…”

Section: The Effects Of Ppb On the Mechanical Properties Ofmentioning

confidence: 99%

Effect of the Prior Particle Boundary on the Microstructure and Mechanical Properties of Hot-Isostatic-Pressed IN718 Alloy

Kuo

Kakehi

2017

Mater. Trans.

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The effects of particle surface contamination and of the prior particle boundary on the microstructure and mechanical properties of hot-isostatic-pressed IN718 alloy were investigated in this study. A thermal-plasma-droplet-re ning technique was conducted to reduce the surface contamination; i.e., oxygen and carbon contents in the gas-atomized IN718 powder. The tensile ductility of hot-isostatic-pressed materials was comparable to those of conventionally wrought materials at room temperature and at 650 C. At 650 C, the hot-isostatic-pressed and heat-treated specimens exhibited worse ductility than the conventionally wrought specimen because of the increased number of brittle precipitates, such as oxides, oxy-carbides and δ phases in the heat-treated specimens. The process of crack nucleation and propagation along the prior particle boundary will take place more easily at high temperatures.

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Section: The Effects Of Ppb On the Mechanical Properties Ofmentioning

confidence: 99%

Effect of the Prior Particle Boundary on the Microstructure and Mechanical Properties of Hot-Isostatic-Pressed IN718 Alloy

Kuo

Kakehi

2017

Mater. Trans.

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“…On assuming that γ ext = 0, the use of the relations (17), (26), (31), and (33) in the microforce balance (13) yields that…”

Section: Yield Criterion and The Plastic Orientation Tensormentioning

confidence: 99%

A phase-field/gradient damage model for brittle fracture in elastic–plastic solids

Duda

Ciarbonetti

Sánchez

et al. 2015

International Journal of Plasticity

206

106

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The formulation of a phase-field continuum theory for brittle fracture in elastic-plastic solids and its computational implementation are presented in this contribution. The theory is based on a virtual-power formulation in which two additional and independent kinematical descriptors are introduced, namely the phase-field and the accumulated plastic strain. Further, it incorporates irreversibility of both phase-field and plastic strain evolutions by introducing suitable constraints and by carefully heeding the influence of those constraints on the kinetics underlying microstructural changes associated with plasticity and fracture.The numerical implementation employs the finite-element method for spatial discretization and a splitting scheme with sub-stepping for the time integration. To illustrate its potential utility, we apply the model to a number of well known linear, as well as non-linear, fracture mechanics problems.The described phase-field model, coupled with plasticity, provides a feasible technique to analyzing crack initiation and the subsequent crack growth resistance only if the length scale parameter included in the phase-field model is finite and treated as a material parameter which should be properly characterized.

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“…4 The effect of stress state on the failure strain. the work required to initiate fracture is lowered by the high yield stress compared with the ultimate tensile strength and by the relatively low work-hardening rate in the specimen (20). The mechanical properties of this alloy are dependent on the thermomechanical processing and final heat treatment.…”

Section: Discussionmentioning

confidence: 99%

Penny-shaped Central Bursting Defect in the Cold Drawing of High Chromium Ferritic Stainless Steel

Shimura

1978

Trans. JIM

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The phenomenon of central bursting during cold drawing of a high-purity high-chromium ferritic stainless steel has been investigated, and it is well established that the defect forms periodically in the drawing direction and does not have the usual chevron or arrow shape but a penny shape. The defect is generated by cleavage fracture at the centerline of the billet, depending on the stress state when plastically deformed during drawing. In drawing the hydrostatic stresses are most tensile in the slipline field analysis, and the damage at a critical tensile stress is most severe at the centerline despite the small amounts of deformation and strain-hardening. The growth of defects takes places in a direction perpendicular to the highest tensile stress by discontinuous cleavage propagation to form the penny shape. Blunting of the crack tip occurs in the region directly under the die and then the crack propagation rate is retarded to stop. Mechanical properties of the high-purity highchromium stainless steel play a very important role in the damage formation process.

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Fracture of High-Strength Materials

Cited by 107 publications

References 10 publications

Effect of the Prior Particle Boundary on the Microstructure and Mechanical Properties of Hot-Isostatic-Pressed IN718 Alloy

Effect of the Prior Particle Boundary on the Microstructure and Mechanical Properties of Hot-Isostatic-Pressed IN718 Alloy

A phase-field/gradient damage model for brittle fracture in elastic–plastic solids

Penny-shaped Central Bursting Defect in the Cold Drawing of High Chromium Ferritic Stainless Steel

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