Fracture Indentation on AISI 1018 Borided Steels

2010 ◽  
Vol 449 ◽  
pp. 9-14 ◽  
Author(s):  
Ivan Campos-Silva ◽  
M. Ortíz-Domínguez ◽  
E. Hernández-Sánchez ◽  
D. Bravo-Bárcenas ◽  
O. Bravo-Bárcenas ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Exposure Time ◽  
Boride Layer ◽  
Crack Model ◽  
Iron Boride ◽  
Fracture Testing ◽  
Experimental Parameters ◽  
Two Temperatures ◽  
Boriding Process ◽  
Palmqvist Crack

Fracture indentation was applied to estimate the fracture toughness of AISI 1018 borided steels. The Fe2B hard layers were formed using the powder-pack boriding process for two temperatures with 4 and 8 h of exposure times. The fracture toughness of the iron boride layer of the AISI 1018 borided steels was estimated using a Vickers microindentation induced-fracture testing at distances of 15 and 30 m from the surface, applying four loads (0.49, 0.98, 1.96 and 2.9 N). The microcracks generated at the corners of the Vickers microindentation were considered as experimental parameters, which are introduced in a Palmqvist crack model to determine their corresponding fracture toughness KC. As a result, the experimental parameters, such as exposure time and boriding temperature are compared with the resulting fracture toughness of the borided phase.

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.

Fracture Toughness of Iron Boride Layers Obtained by Paste Boriding Process

2007 ◽  
Vol 553 ◽  
pp. 21-26 ◽  
Author(s):  
G. Ramírez ◽  
Ivan Campos-Silva ◽  
Alexander S. Balankin
Keyword(s):  
Fracture Toughness ◽  
Boride Layer ◽  
Critical Stress Intensity Factor ◽  
Iron Boride ◽  
Linear Elastic ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Fe2b Phase ◽  
Boriding Process ◽  
1045 Steel

The fracture toughness of the Fe2B phase was evaluated in this study. Formation of the Fe2B boride is carried out though paste boriding process applied on AISI 1045 steel surface. The treatment was carried out at temperatures of 1193, 1223 and 1273 K for 6 h using a 5 mm thick boron paste. A Vickers microhardness tester was used to generate microcracks at a load of 200g. The indentations were made across the thickness of the iron boride layer at four different distances from the substrate. The experimental results show that the critical stress intensity factor KIC for the Fe2B phase shows a potential law dependence on crack length; this contradicts the concepts of Linear Elastic Fracture Mechanics, which establish that the fracture toughness value is a constant of the material.

Formation of Hard Layers in Tool Steels

2013 ◽  
Vol 690-693 ◽  
pp. 2059-2062 ◽  
Author(s):  
N. Lopez-Perrusquia ◽  
M. A. Doñu-Ruiz ◽  
S. Rodríguez-González ◽  
D. L. Rosado Cruz ◽  
Frumencio Vasquez-Ramírez
Keyword(s):  
Fracture Toughness ◽  
Crack Model ◽  
Tool Steels ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Aisi 4140 ◽  
Steel Aisi ◽  
Boriding Process ◽  
Palmqvist Crack

In the present study, identify the fracture toughness and strength adhesion of borided layers on grade tools steels by Boronizing, two commonly used steel AISI 4140 and AISI 9840 are considered, the steels contain 1.0 - 0.8 wt% Cr and 0.20 - 0.25 wt% Mo, respectively. The formation of the borided layers was carried out by the powder pack boriding process at a temperature range of 1273 K for 4, 6 and 8 h. X-ray diffraction analysis revealed peak of FeB, Fe2B and CrB, the Fracture toughness of the layers is estimated at 15 and 30 um from surface using four different Vickers indentation loads, using Palmqvist crack model, the adherence of the layer/substrate was evaluate in qualitative form though the Rockwell C. The fracture toughness of the borides depends strongly on temperature and time bronzing. Also, good adhesion is obtained around the Rockwell C indentation prints on the borided layer-substrate-interface.

Fracture Toughness of Iron Boride Layers Obtained by Paste Boriding Process

2007 ◽  
pp. 21-26
Author(s):  
G. Ramírez ◽  
I. Campos ◽  
A. Balankin
Keyword(s):  
Fracture Toughness ◽  
Iron Boride ◽  
Boriding Process

Characterization and Fracture Toughness on AISI 8620 with Hard Coatings

2016 ◽  
Vol 369 ◽  
pp. 89-94
Author(s):  
M.A. Doñu Ruiz ◽  
N. López Perrusquia ◽  
D. Sanchez Huerta ◽  
C.R. Torres San Miguel ◽  
V.J. Cortés Suárez
Keyword(s):  
Fracture Toughness ◽  
Experimental Parameter ◽  
Hard Coatings ◽  
Crack Model ◽  
X Ray Diffraction ◽  
Tree Model ◽  
X Ray ◽  
Metallographic Technique ◽  
Palmqvist Crack ◽  
Scanning Electron

The present studies characterize and evaluate the fracture toughness at the surface AISI 8620 with hard coating. The hard coatings FeB and Fe2B were formed using the boriding dehydrated paste at temperatures 1223 and 1273 K with 6 and 8 h exposure time, respectively. The presence of hard coatings formed on the surface AISI 8620 were confirmed by the classical metallographic technique combined with X-ray diffraction analysis. The distribution of alloying elements was determined by Energy Dispersive Spectroscopy (EDS). The fracture toughness of the hard coatings on AISI 8620 was estimated using a Vicker microindentation induced fracture testing of 15 and 35 μm from the surface, applying four load (0.49, 0.98,1.96 and N). The microcrack generated at the corner of the microindentation was considered as an experimental parameter and the tree model Palmqvist crack model was employed to determine the fracture toughness. The adherence of the hard coatings/substrate was evaluate in qualitative form though the VDI 3198 by testing Rockwell C and observed by Scanning Electron Microscopy (SEM). The formation of hard layers was obtained in the range of 100-130 μm, results of XRD present phases FeB, Fe2B, CrB and MnB, the values obtained of Kc are in the range of 2.3 to 4.1 MPam1⁄2 and results of acceptable adhesion HF4 patterns for conditions 6 h of treatment

Evaluation of Brittle Layers Obtained by Boriding on AISI H13 Steels

2009 ◽  
Vol 65 ◽  
pp. 47-52 ◽  
Author(s):  
N. López-Perrusquia ◽  
Ivan Campos-Silva ◽  
José Martínez-Trinidad ◽  
A. Avilés ◽  
E. Alvárez-Castañeda ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Boride Layer ◽  
Vickers Indentation ◽  
Indentation Technique ◽  
Substrate Interface ◽  
Aisi H13 ◽  
Boriding Process ◽  
Brittle Layers ◽  
Poor Adhesion ◽  
Borided Steel

The fracture toughness of AISI H13 borided steel and the strength adhesion of the coated system were estimated in the present work. The formation of the layers was carried out by the powder pack boriding process at 1273 K with 8 h of treatment. The fracture toughness (KC) of the layer is estimated at 25 and 45 m from the surface using four different Vickers indentation loads. The KC values were estimated by the extension of Palmqvist cracks parallel and perpendicular to the surface obtained at the indentation corners. The adherence of the layer/substrate was evaluated in qualitative form through the Rockwell-C indentation technique. The results obtained by both techniques, show, in first instance, that the fracture toughness of the boride layer can be expressed in the form (KC) (π/2) > (KC) > (KC) (0). Also, high delamination is obtained around the Rockwell-C indentation prints that denote poor adhesion in the coating-substrate interface.

scholarly journals A Study on the Effect of the Boron Potential on the Mechanical Properties of the Borided Layers Obtained by Boron Diffusion at the Surface of AISI 316L Steel

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
E. Hernández-Sánchez ◽  
Y. M. Domínguez-Galicia ◽  
C. Orozco-Álvarez ◽  
R. Carrera-Espinoza ◽  
H. Herrera-Hernández ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Exposure Time ◽  
Control Volume ◽  
Aisi 316L ◽  
Boron Diffusion ◽  
Instrumented Indentation ◽  
316L Steel ◽  
Inner Diameter ◽  
Boriding Process

The effect of the boron potential on the thickness and the mechanical properties of borided layers was evaluated. The boron potential was established by means of the available atoms of boron contained in a control volume inside a cylinder. The cylinders were manufactured from AISI 316L steel, and the boriding treatment was performed using the powder pack technique at a temperature of 1273 K over an exposure time of 6 h. Four different internal diameters of the cylinders were evaluated (3.17, 4.76, 6.35, and 7.93 mm). The mechanical properties were evaluated using the Berkovich instrumented indentation technique. The results showed a clear influence of the boron potential on the mechanical properties of the layers. The hardness of the layers was stablished in the range of 16.22 to 21.16 GPa. Young’s modulus values were stablished in the range of 255.96 to 341.37 GPa. Also the fracture toughness and brittleness of the layers reflected the influence of the boron potential supplied during the boriding process. Finally, the influence of the boron potential on the constant of parabolic growth (K) was also established as a function of the inner diameter of the cylinders.

Formation and Characterization of Hard Coatings on Ductile Iron Grade 100-70-03

2016 ◽  
Vol 367 ◽  
pp. 52-59
Author(s):  
N. López-Perrusquia ◽  
M.A. Doñu Ruiz ◽  
D. Sánchez Huerta ◽  
J. Noriega-Zenteno ◽  
J.V. Cortés-Suarez
Keyword(s):  
Fracture Toughness ◽  
Ductile Iron ◽  
Thermochemical Treatment ◽  
Boride Layer ◽  
Hard Coatings ◽  
Iron Boride ◽  
Iron Grade ◽  
Kinetics Of ◽  
Xrd Method

This paper studies the formation of iron boride on the surface in ductile iron 100-70-03 class exposed to a thermochemical treatment boron dehydrated paste. The formation of iron boride layers Fe2B/FeB-type were obtained at temperatures of 1173 K, 1223 K and 1273 K, with exposure times of 8 hours of treatment. The study consisted in evaluating the growth kinetics of the boride layer on the surface of ductile iron boriding. Also the boride layers were determined by the XRD method, EDS. Also evaluated fracture toughness technique Vickers microindentation 15 and 30 microns from the surface with different loadings of iron boride microindentation formed on the surface.

Evaluation Hard Layers in Steel AISI 8620

2013 ◽  
Vol 690-693 ◽  
pp. 2055-2058 ◽  
Author(s):  
N. Lopez-Perrusquia ◽  
M. A. Doñu-Ruiz ◽  
Victor Cortes Suarez ◽  
D. Sánchez-Huitron ◽  
E.Y. Vargas-Oliva ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Diffraction Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Crack Model ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Borided Layer ◽  
Steel Aisi ◽  
Palmqvist Crack

In the present study, identify the fracture toughness and strength adhesion of borided layers in Steel AISI 8620 by boriding dehydrated paste. The formation of the borided at a temperature range of 1173, 1223 and 1273 K for 4, 6 and 8 h. X-ray diffraction analysis revealed peak of FeB, Fe2B, MoB and CrB and The distribution of alloying elements was detected by means of energy dispersive Spectroscopy (EDS), the Fracture toughness of the layers is estimated at 15 and 30 um from surface using different loads indentation Vickers, using Palmqvist crack model, the adherence of the layer/substrate was evaluate in qualitative form though the Rockwell C. The fracture toughness of the borides depends strongly on temperature and time boriding. Also, good adhesion is obtained around the Rockwell C indentation prints on the borided layer-substrate-interface.

Measurement of Fracture Toughness in AISI 1018 Borided Steels by Vickers Indentation

2009 ◽  
Vol 283-286 ◽  
pp. 675-680
Author(s):  
Ivan Campos-Silva ◽  
N. López-Perrusquia ◽  
M. Ortíz-Domínguez ◽  
U. Figueroa-López ◽  
E. Hernández-Sánchez
Keyword(s):  
Fracture Toughness ◽  
Boron Carbide ◽  
Exposure Time ◽  
Steel Surface ◽  
Applied Load ◽  
Vickers Indentation ◽  
Mean Values ◽  
Thermochemical Process ◽  
Experimental Parameters ◽  
The Mean

This study evaluates the fracture toughness of Fe2B boride layers formed by the paste boriding thermochemical process on an AISI 1018 steel surface. The samples were placed in acrylic molds for the impregnation of boron carbide paste with thickness of 4mm over the sample surfaces to produce the diffusion into the steel. The aforementioned treatment considered one temperature, T= 1273 K, and three exposure times t=5, 6 and 8 h. Later, the borided samples were prepared metallographically to determine the mean values of the layer thicknesses and to produce Vickers microindentations at 45 m from the surface, applying four loads (1.9, 2.9, 4.9 and 9.8 N). The microcracks generated at the corners of the Vickers microindentation were considered as experimental parameters, which are introduced into two Palmqvist cracks models to determine their corresponding fracture toughness KC. As a result, the experimental parameters, such as exposure time and applied load are compared with the resulting fracture toughness of the borided phase.

Sign in / Sign up

Export Citation Format

Share Document