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

2021 ◽  
Vol 2 (1) ◽  
pp. 6-22
Author(s):  
Ruslan Balokhonov ◽  
◽  
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.

Mechanical Behavior of Iron Boride Formed in the Surface of an AISI W2

2015 ◽  
Vol 365 ◽  
pp. 142-147 ◽  
Author(s):  
T. de la Mora-Ramírez ◽  
D. Sánchez Huerta ◽  
N. López-Perrusquia ◽  
M.A. Doñu Ruiz ◽  
E.A. Cerrillo-Moreno ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Steel Substrate ◽  
Boride Layer ◽  
Test Method ◽  
X Ray Diffraction ◽  
Iron Boride ◽  
Different Temperatures ◽  
Steel Aisi ◽  
Constant Distance ◽  
Boriding Process

The present study reports the growth of layers formed in the surface of the boride steel AISI W2; by the application of the dehydrated paste-pack boriding process and using three different temperatures at 1173, 1223 and 1273 K, with 2, 4, 6 and 8 h of exposure. The substrate and the boride Fe2B were analysed quantitatively and qualitatively. The growth of the boride layer Fe2B was examined using optical microscopy (OM), scanning electron microscopy (SEM-EDS) and X-ray diffraction (XRD). The properties were mechanically evaluated, using a Vickers indenter with loads of 0.5 and 1 N, with a constant distance of 15 μm and 30 μm. To determine the fracture toughness (Kc) and the adherence of the boride layer Fe2B, the Rockwell C test method (VDI 3198) was used. The morphology present in the boride Fe2B layer showed a smooth flat, whit ranged thickness from 13.96 ± 1.61 μm to 79.86 ± 4.13 μm. The presence of boride Fe2B layers of steel substrate was confirmed by XRD and the distribution of alloying elements by Energy Disperses for Spectroscopy (EDS). The hardness of the boride layers Fe2B ranged from 157 9± 17 to 1875 ± 25 HV. The fracture toughness of boride Fe2B layer observed ranged from 4.15 to 4.75 MPam1/2. The boride layer has a scale delamination H3 to H6. The boride layers formed in the surface have the function to increase the service life of W2 steels used in the industry.

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

2006 ◽  
Vol 200 (11) ◽  
pp. 3518-3526 ◽  
Author(s):  
L.W. Ma ◽  
J.M. Cairney ◽  
M.J. Hoffman ◽  
P.R. Munroe
Keyword(s):  
Steel Substrate ◽  
Deformation And Fracture

Wear behavior of iron boride coating on AISI 4140

2016 ◽  
Vol 52 (1) ◽  
pp. 119-127 ◽  
Author(s):  
S. Osman Yilmaz ◽  
Tanju Teker ◽  
Selçuk Karataş
Keyword(s):  
Wear Behavior ◽  
Boride Coating ◽  
Iron Boride ◽  
Aisi 4140

Neutron Diffraction Residual Stress Evaluation and Numerical Modeling of Coating Obtained by PTA Process

2010 ◽  
Vol 638-642 ◽  
pp. 594-599
Author(s):  
Abdeljalil Nady ◽  
Herve Bonnefoy ◽  
Vincent Klosek ◽  
Marie Helene Mathon ◽  
Alain Lodini
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Complex Geometry ◽  
Steel Substrate ◽  
Diffraction Method ◽  
Stress Evaluation ◽  
Physical Conditions ◽  
Abaqus Code ◽  
Neutron Diffraction Method ◽  
Good Agreement

The Stellite 6 hardfacing alloys have been deposited on steel substrate using a Plasma Transferred Arc (PTA) with complex geometry. The residual strain of the PTA technology at the surface of coating layer and the interface were determined by neutron diffraction method. In the present work, a numerical model for the residual stresses formed during the PTA process with physical conditions and mechanical properties using the Abaqus code is analysed. The result reveals that the residual stresses obtained by the numerical simulation are in very good agreement with experimental results by the neutron diffraction.

scholarly journals Microstructure-Based Computational Analysis of Deformation and Fracture in Composite and Coated Materials Across Multiple Spatial Scales

2020 ◽  
pp. 377-419
Author(s):  
Ruslan R. Balokhonov ◽  
Varvara A. Romanova
Keyword(s):  
Strain Rate ◽  
Initial Conditions ◽  
Spatial Scales ◽  
Aluminum Matrix ◽  
Multiple Spatial Scales ◽  
Coated Materials ◽  
Deformation And Fracture ◽  
Physically Based ◽  
The Matrix ◽  
Strain Formulation

AbstractA multiscale analysis is performed to investigate deformation and fracture in the aluminum-alumina composite and steel with a boride coating as an example. Model microstructure of the composite materials with irregular geometry of the matrix-particle and substrate-coating interfaces correspondent to the experimentally observed microstructure is taken into account explicitly as initial conditions of the boundary value problem that allows introducing multiple spatial scales. The problem in a plane strain formulation is solved numerically by the finite-difference method. Physically-based constitutive models are developed to describe isotropic strain hardening, strain rate and temperature effects, Luders band propagation and jerky flow, and fracture. Local regions experiencing bulk tension are found to occur during compression that control cracking of composites. Interrelated plastic strain localization in the steel substrate and aluminum matrix and crack origination and growth in the ceramic coating and particles are shown to depend on the strain rate, particle size and arrangement, as well as on the loading direction: tension or compression.

Deformation and fracture behavior of tungsten fiber-reinforced bulk metallic glass composite subjected to transverse loading

2006 ◽  
Vol 21 (6) ◽  
pp. 1375-1384 ◽  
Author(s):  
H. Zhang ◽  
L.Z. Liu ◽  
Z.F. Zhang ◽  
K.Q. Qiu ◽  
X.F. Pan ◽  
...  
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fracture Behavior ◽  
Glassy Matrix ◽  
Glass Composite ◽  
Tungsten Fiber ◽  
Aspect Ratios ◽  
Deformation And Fracture ◽  
Bulk Metallic Glass Composite

Deformation and fracture behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass and its composite containing transverse tungsten fibers in compression were investigated. The monolithic metallic glass and the tungsten fiber composite specimens with aspect ratios of 2 and 1 are shown to have essentially the same ultimate strength under compression. The damage processes in the bulk metallic glass composite consisted of fiber cracking, followed by initiation of shear band in the glassy matrix mainly from the impingement of the fiber crack on the fiber/matrix interface. The site of the shear band initiation in the matrix is consistent with the prediction of finite element modeling. Evidence is present that the tungsten fiber can resist the propagation of the shear band in the glassy matrix. However, the compressive strain to failure substantially decreased in the present composite compared with the composites containing longitudinal tungsten fibers. Finally, the two composite specimens fractured in a shear mode and almost all the tungsten fibers contained cracks.

scholarly journals Dynamic ESPI Evaluation of Deformation and Fracture Mechanism of 7075 Aluminum Alloy

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1530
Author(s):  
Shun Takahashi ◽  
Sanichiro Yoshida ◽  
Tomohiro Sasaki ◽  
Tyler Hughes
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Shear Band ◽  
Fracture Mechanism ◽  
Shear Force ◽  
Annealed Specimen ◽  
7075 Aluminum Alloy ◽  
Uniform Deformation ◽  
Deformation And Fracture ◽  
Peak Aged

The deformation and fracture mechanism in 7075 aluminum alloy is discussed based on a field theoretical approach. A pair of peak-aged and overaged plate specimens are prepared under the respective precipitation conditions, and their plastic deformation behaviors are visualized with two-dimensional electronic speckle pattern interferometry (ESPI). The in-plane velocity field caused by monotonic tensile loading is monitored continuously via the contour analysis method of ESPI. In the plastic regime, the peak-aged specimen exhibits a macroscopically uniform deformation behavior, while the annealed specimen exhibits non-uniform deformation characterized by a localized shear band. The occurrence of the shear band is explained by the transition of the material’s elastic resistive mechanism from the longitudinal force dominant to shear force dominant mode. The shear force is interpreted as the frictional force that drives mobile dislocations along the shear band. The dynamic behavior of the shear band is explained as representing the motion of a solitary wave. The observed decrease in the solitary wave’s velocity is accounted for by the change in the acoustic impedance with the advancement of plastic deformation.

Influence of Strain Rate on Shear Localization during Deformation and Fracture of 5754 and 5182 Aluminium Alloy

2006 ◽  
Vol 519-521 ◽  
pp. 1047-1052 ◽  
Author(s):  
Mohammad Jaffar Hadianfard ◽  
Michael J. Worswick
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Strain Rate ◽  
Shear Bands ◽  
Tensile Tests ◽  
Material Behavior ◽  
Damage Development ◽  
Band Formation ◽  
Deformation And Fracture ◽  
Localized Plastic Deformation

The effect of strain rate in the range of 10-4 to 10-1 s-1 on localization of deformation and fracture behavior of 5754 and 5182 aluminum alloys is investigated. For this study, tensile tests, interrupted tensile tests, shear band decoration, fractography and image analysis has been used. This investigation is based on experimental work and observation of the material behavior. Results show that strain rate has some effect on the mechanical properties and deformation stability of the alloys. The area of localized plastic deformation and thickness of the shear bands were found to be sensitive to the strain rate. It was also observed that localization of plastic deformation and shear band formation is an important step in the damage propagation and final fracture of the alloys. Detail of damage development, based upon micrographs of samples interrupted at different stages of straining is presented

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