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.

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 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.

scholarly journals Characterization of bilayer (FeB/Fe2B) on AISI H13 work tool steel

2021 ◽  
Vol 65 (2) ◽  
pp. 40-48
Author(s):  
B. Boumaali ◽  
Abdellah Z. Nait ◽  
M. Keddam
Keyword(s):  
Transition Zone ◽  
Boride Layer ◽  
Dual Phase ◽  
H13 Steel ◽  
Aisi H13 Steel ◽  
Reduced Modulus ◽  
Aisi H13 ◽  
Xrd Studies ◽  
Kinetics Of

Abstract In this work, the borided layers were produced on AISI H13 steel via solid boriding with a powders mixture containing 90 wt.% B4C and 10 wt.% NaBF4 for treatment times of 2-6 h at 900, 950 and 1000 °C. The microscopic observations revealed a less pronounced toothed interface between the borided layer and the transition zone. The XRD studies indicated the presence of a dual phase boride layer (FeB/Fe2B) besides the chromium and vanadium borides as precipitates inside it. The boronizing kinetics of AISI H13 steel was investigated by using the classical parabolic growth law. The obtained value of boron activation energy in the entire boride layer (FeB + + Fe2B) was found to be 236.34 kJ mol-1. Furthermore, this value of energy has been compared to the literature data. Finally, the nanohardness and reduced modulus of elasticity were measured for FeB, Fe2B and transition zone.

scholarly journals Microcracks Reduction in Laser Hardened Layers of Ductile Iron

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 368
Author(s):  
Eduardo Hurtado-Delgado ◽  
Lizbeth Huerta-Larumbe ◽  
Argelia Miranda-Pérez ◽  
Álvaro Aguirre-Sánchez
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Surface Hardening ◽  
Microstructural Characterization ◽  
The Core ◽  
Critical Areas ◽  
Heat Treated ◽  
Iron Grade ◽  
Hardened Surface

A study of surface hardening of Ductile Iron (DI) with and without austempering heat treatment was developed. The chemical composition of the material contains alloying elements such as Cu and Ni, that allow to obtain a Ductile Iron Grade 120-90-02, based on ASTM A536, which was heat treated to be transformed to Austempered Ductile Iron (ADI). Specimens of 10 × 10 × 5 mm3 were obtained for application of surface hardening by Nd:YAG UR laser of 150 W maximum power. The parameters used were advance speed of 0.2 and 0.3 mm/s and power at 105, 120, 135 and 144 W; the departure microstructures were fully pearlitic in the samples without heat treatment, and ausferrite for austempered samples. Microstructural characterization of hardened samples was performed were analyzed and martensite and undissolved carbides were identified in the pearlitic samples, while in ausferrite samples it was found finer martensite without carbides. The depth of hardened surface to different conditions and their respective microhardness were measured. The results indicate that the surface hardening via laser is a suitable method for improving wear resistance by means of hardness increment in critical areas without compromising the core ductility of DI components, but the surface ductility is enhanced when the DI is austempered before the laser hardening, by the reduction of surface microcracks.

scholarly journals The Effect of the Number of Eutectic Grains on Coating Growth During Hot Dip Galvanising of Ductile Iron Castings

2014 ◽  
Vol 14 (1) ◽  
pp. 67-70
Author(s):  
D. Kopyciński ◽  
E. Guzik ◽  
A. Szczęsny
Keyword(s):  
Cross Sections ◽  
Ductile Iron ◽  
Metal Matrix ◽  
Zinc Coating ◽  
Annealing Treatment ◽  
Test Results ◽  
Iron Castings ◽  
Iron Grade ◽  
Kinetics Of ◽  
Coating Growth

Abstract Studies were conducted on a zinc coating produced on the surface of ductile iron grade EN-GJS-500-7 to determine the eutectic grain effect. For this purpose, castings with a wall thickness of 5 to 30 mm were made and the resulting structure was examined. To obtain a homogeneous metal matrix, samples were subjected to a ferritising annealing treatment. To enlarge the reaction surface, the top layer was removed from casting by machining. Then hot dip galvanising treatment was performed at 450°C to capture the kinetics of growth of the zinc coating (in the period from 60 to 600 seconds). Analysing the test results it was found that within the same time of hot dip galvanising, the differences in the resulting zinc coating thickness on samples taken from castings with different wall cross-sections were small but could, particularly for shorter times of treatment, reduce the continuity of the alloyed layer of the zinc coating.

Effect of Hard Coatings on Surface Gray Iron on Fracture Toughness

2014 ◽  
Vol 353 ◽  
pp. 248-253 ◽  
Author(s):  
L.D. Rosado Cruz ◽  
Marco Antonio Doñu-Ruíz ◽  
N. López Perrusquia ◽  
V.J. Cortés Suárez ◽  
C.R. Torres San Miguel ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Gray Iron ◽  
Boride Layer ◽  
Hard Coatings ◽  
Gray Cast ◽  
X Ray Diffraction ◽  
Cast Irons ◽  
Three Point Bending ◽  
Boriding Process ◽  
Gray Cast Irons

The characterization and fracture toughness with hard coatings formed at the surface of gray cast irons class 30 is evaluated in the present study. The formation of hard coatings was obtained out means of the pack boriding process; the treatment was carried out at temperatures of 1173 and 1223 K during 6 hours. The layers were evaluated by the techniques of X-ray diffraction (XRD), energy dispersive spectrometry (EDS) and microindentation across the thickness of the iron boride layer. Three-point bending tests are carried out to examine the fracture toughness of gray cast irons boriding according to the ASTM 399 standard. Consequently, the stress intensity factor was evaluated by means of the finite element method (FEM) using the package ANSYS 11. 0 creating a two-dimensional model with elements of singularity around the tip crack. The results were compared with the experiments and have been found to be in good correlation.

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.

Characterization of Adherence Steels Hardened Superficially

2014 ◽  
Vol 1616 ◽  
Author(s):  
D. Sanchez-Huerta ◽  
T. De la Mora-Ramírez ◽  
M.A. Doñu-Ruiz ◽  
N. López-Perrusquia ◽  
J. V. Cortés-Suarez
Keyword(s):  
Manufacturing Industry ◽  
Impact Test ◽  
Thermochemical Treatment ◽  
Processing Temperature ◽  
X Ray Diffraction ◽  
Iron Boride ◽  
X Ray ◽  
German Standard ◽  
Aisi 316

ABSTRACTThis study evaluates the behavior of the adherence layers - sawn flat iron boride formed on the surface of steels used in manufacturing industry in Mexico. In steels AISI 1018, AISI 8620 and AISI 316 was characterized this behavior, boriding thermochemical treatment with box technique, with a processing temperature of 1273 °K, with an exposure time of 8 hours. Furthermore the adherence is assessed by the Rockwell C hardness technique prescribed by the German standard VDI 3198 of traction, this impact test qualitatively determine the type of adherence formed three thermochemical steels treated by the technique of boriding. Moreover optical microscopy determines the type of film morphology FeB/ Fe2B of each of the materials exposed to a boriding, also shows the thicknesses of the phases generated in the surface type in all three steels boriding. Phase presence boride FeB/Fe2B was determined by X -ray diffraction (XRD). Technique for scanning electron microscopy (EDS) was evaluated qualitatively the presence of FeB/Fe2B of boronizing. Otherwise determines the hardness and elastic modulus by nanoindentation technique of the phases present in the three steels. Lastly, AISI 1018 and AISI 8620 are bounding scale H1 to H3, the AISI 316 steel has an adherence of H3 to H6 under German standard VDI 3198.

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