The effect of the irregular interface geometry in deformation and fracture of a steel substrate–boride coating composite

The interfacial mechanisms of the stress-strain localization in non-homogeneous media are investigated, using a steel substrate - iron boride coating composition subjected to tension as an example. A dynamic boundary-value problem in a plane-strain formulation is solved numerically by the finite-difference method. The curvilinear substrate-coating interface geometry is assigned explicitly in calculations and is in agreement with experiment. Constitutive relations accounting for an elastic-plastic response of the isotropically-hardened substrate and for a brittle fracture of the coating are employed. Three stages of the plastic strain localization in the steel substrate are found to occur due to the irregular interface geometry. Distributions of the stress concentration regions in the coating are shown to be different at different stages. The stress concentration in the coating is demonstrated to increase nonlinearly during the third stage. The location of fracture is found to depend on the strength of the coating.

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A mesoscopic analysis of a localized shear band propagation effect on the deformation and fracture of coated materials

Reports in Mechanical Engineering ◽

10.31181/rme200102006b ◽

2021 ◽

Vol 2 (1) ◽

pp. 6-22

Author(s):

Ruslan Balokhonov ◽

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Varvara Romanova ◽

Aleksandr Zemlianov ◽

◽

...

Keyword(s):

Shear Band ◽

Complex Geometry ◽

Steel Substrate ◽

Front Propagation ◽

Front Velocity ◽

Boride Coating ◽

Iron Boride ◽

Coated Materials ◽

Deformation And Fracture ◽

Cracking Pattern

The numerical simulations of the deformation and fracture in an iron boride coating – steel substrate composition are presented. The dynamic boundary-value problem is solved numerically by the finite-difference method. A complex geometry of the borided coating – steel substrate interface is taken into account explicitly. To simulate the mechanical behavior of the steel substrate, use is made of an isotropic strain hardening model including a relation for shear band propagation. Local regions of bulk tension are shown to arise near the interface even under simple uniaxial compression of the composition and in so doing they determine the mesoscale mechanisms of fracture. The interrelation between plastic deformation in the steel substrate and cracking of the borided coating is studied. Stages of shear band front propagation attributable to the interface complex geometry have been revealed. The coating cracking pattern, location of the fracture onset regions and the total crack length are found to depend on the front velocity in the steel substrate.

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Deformation and fracture of TiN and TiAlN coatings on a steel substrate during nanoindentation

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2004.09.034 ◽

2006 ◽

Vol 200 (11) ◽

pp. 3518-3526 ◽

Cited By ~ 39

Author(s):

L.W. Ma ◽

J.M. Cairney ◽

M.J. Hoffman ◽

P.R. Munroe

Keyword(s):

Steel Substrate ◽

Deformation And Fracture

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The influence of the irregular interface geometry on fracture of EB-PVD yttria-stabilized zirconia coatings

10.1063/1.5083469 ◽

2018 ◽

Author(s):

Alexey Panin ◽

Marina Kazachenok ◽

Sergey Martynov ◽

Andrey Rusyaev

Keyword(s):

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Irregular Interface ◽

Interface Geometry

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Simulation of deformation and fracture of coated material with account for propagation of a Lüders-Chernov band in the steel substrate

Physical Mesomechanics ◽

10.1134/s1029959913020045 ◽

2013 ◽

Vol 16 (2) ◽

pp. 133-140 ◽

Cited By ~ 8

Author(s):

R. R. Balokhonov ◽

V. A. Romanova ◽

S. A. Martynov ◽

E. A. Schwab

Keyword(s):

Steel Substrate ◽

Coated Material ◽

Deformation And Fracture

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Environmental cell studies of deformation and fracture

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100175715 ◽

1990 ◽

Vol 48 (4) ◽

pp. 516-517

Author(s):

H. K. Birnbaum ◽

I. M. Robertson

Keyword(s):

National Laboratory ◽

Argonne National Laboratory ◽

Damage Threshold ◽

Chromatic Aberration ◽

Good Choice ◽

Point Of View ◽

Deformation And Fracture ◽

Environmental Cell ◽

Gas Molecules ◽

The University

Studies of the effects of hydrogen environments on the deformation and fracture of fcc, bcc and hep metals and alloys have been carried out in a TEM environmental cell. The initial experiments were performed in the environmental cell of the HVEM facility at Argonne National Laboratory. More recently, a dedicated environmental cell facility has been constructed at the University of Illinois using a JEOL 4000EX and has been used for these studies. In the present paper we will describe the general design features of the JEOL environmental cell and some of the observations we have made on hydrogen effects on deformation and fracture.The JEOL environmental cell is designed to operate at 400 keV and below; in part because of the available accelerating voltage of the microscope and in part because the damage threshold of most materials is below 400 keV. The gas pressure at which chromatic aberration due to electron scattering from the gas molecules becomes excessive does not increase rapidly with with accelerating voltage making 400 keV a good choice from that point of view as well. A series of apertures were placed above and below the cell to control the pressures in various parts of the column.

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Deformation and fracture behavior of an Al-Li-Cu-Mg-Zr alloy 8090

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178008 ◽

1990 ◽

Vol 48 (4) ◽

pp. 974-975

Author(s):

D.M. Jiang ◽

B.D. Hong

Keyword(s):

High Strength ◽

Deformation And Fracture ◽

Fracture Behaviors ◽

Aluminum Lithium ◽

Carbon Fiber Reinforced Composites ◽

Peak Aged ◽

Aluminum Lithium Alloys ◽

High Strength Aluminum Alloys ◽

Lithium Alloys ◽

Zr Alloy

Aluminum-lithium alloys have been recently got strong interests especially in the aircraft industry. Compared to conventional high strength aluminum alloys of the 2000 or 7000 series it is anticipated that these alloys offer a 10% increase in the stiffness and a 10% decrease in density, thus making them rather competitive to new up-coming non-metallic materials like carbon fiber reinforced composites.The object of the present paper is to evaluate the inluence of various microstructural features on the monotonic and cyclic deformation and fracture behaviors of Al-Li based alloy. The material used was 8090 alloy. After solution treated and waster quenched, the alloy was underaged (190°Clh), peak-aged (190°C24h) and overaged (150°C4h+230°C16h). The alloy in different aging condition was tensile and fatigue tested, the resultant fractures were observed in SEM. The deformation behavior was studied in TEM.

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