Kinetic study of boron diffusion in the paste-boriding process

Campos, Irma Manrique; Oseguera, J.; Figueroa, U.; García, Jesús Alonso; Bautista, O.; Kelemenis, G

doi:10.1016/s0921-5093(02)00910-3

Cited by 131 publications

(81 citation statements)

References 6 publications

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“…The simulations of these situation is in a good agreement with each condition of experimental works, 9) which is around 40 mm for 1223 K, between 50-60 mm for temperature of 1253 K and around 70 mm for temperature of 1273 K as shown in the Fig. 7.…”

Section: Simulation Results and Discussionsupporting

confidence: 82%

“…Among them, study on the pack boronizing process 1,3,[5][6][7] took the most interest since this process offers a simpler way to produce boride layer. One of the progressive researches on the pack boronizing process have been done by Keddam 3,8) who works on the simulation of the growth kinetic of Fe 2 B, taking into account the thermodynamic properties of the Fe-B phase diagram and adopting diffusivity of boron by Campos et al 9) In the present study, phase-field method was applied to simulate the growth of single Fe 2 B boride from the austenite phase and taking several important experimental data for the pack boronizing of ARMCO iron by Campos et al, 9) which is also used as the input data for the simulation of boronizing process by Keddam. 3) Different with the previous simulations work on boronizing process 3,8,9) that use the mass balance equation as the basic model, phase-field model for the growth of boride phase is derived from Ginzburg-Landau free energy functional that consider the free energy value from thermochemical database and related physical parameters of materials such as interface energy and interface thickness of the corresponding material. This method has been well proved to simulate many kinds of phase transformations, such as austenite-ferrite transformation in steel.…”

Section: Introductionmentioning

confidence: 99%

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Free Energy Problem for the Simulations of the Growth of Fe<SUB>2</SUB>B Phase Using Phase-Field Method

2008

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The present simulation works develop phase-field method to replicate the growth of Fe 2 B boride from austenite phase. The present works also give a major concern on the free energy driving force problem for this transformation. In order to enhance the reliability of this study, free energy driving force is left as the only variable parameter to be optimized while other parameters were taken from experimental data. Several sets of free energy have been established based on the thermo-chemical database and the assumption that there is a parabolic relationship between free energy of boride/austenite and boron concentration. On the other hand, in order to allow the growth of single Fe 2 B phase, temperature of 1223 K has been chosen as the evaluated temperature. Based on the comparison of the present numerical results and available experimental data, one set of free energy has been considered to give the appropriate condition that approaching the experimental condition for the growth of Fe 2 B from austenite phase.

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Section: Simulation Results and Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Free Energy Problem for the Simulations of the Growth of Fe<SUB>2</SUB>B Phase Using Phase-Field Method

2008

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“…The surface treatments allows to meet a wider range of parts requirements, such as increased hardness in combination with good toughness 8 . The boriding is a thermochemical treatment technique used in many areas of engineering processes of metals, where the boron atoms are diffused in the surface to form borides with the base metal [8][9][10] . The boron atoms owing to its relatively small size and high mobility can diffuse into the substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

et al. 2017

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Herein, it was conducted a study in order to examine the main fracture characteristics in the transverse rupture strength test (TRS) of a high speed steel (HSS) AISI M2 produced by powder metallurgy (PM) and with boriding treatment. Four conditions have been studied: as-sintered, borided, normalized and borided + TiN. The TRS tests were conducted in accordance with ASTM B528-12 standard. Density, Vickers hardness and transverse rupture strength properties were evaluated. Fractography was observed by scanning electron microscope (SEM). TRS test in the as-sintered condition had the best performance. The fractography of samples showed very irregular appearance, with interconnected porosity for the matrix of the samples and the boride layer had a smooth surface with low porosity. It was observed on the boride layer, the growth of boride layers inside the pores, filling them, which is a positive factor on the TRS. However, cracks were observed in the FeB/Fe 2 B interface of boride layer, which embrittle the material and reduce the TRS. In fractography of borided samples, it is observed that two fracture modes occur, mode I and mode II. This should be explained owing to the difference between the elasticity modulus of FeB and Fe 2 B interface.

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“…Hard coatings with carbides, borides and nitrides have been successfully utilised for engineering applications where specific properties at particular locations are required without compromising the bulk material strengths [1][2][3][4][5]. In particular, resistant layers of borides are produced in ferrous and non-ferrous materials through the well-developed process of boriding.…”

Section: Introductionmentioning

confidence: 99%

Boro-nitriding coating on pure iron by powder-pack boriding and nitriding processes

et al. 2016

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To alleviate spallation and crack difficulties exhibited by a borided metallic surface when it is subjected to a normal, heavy and sliding load under dry conditions, a boron nitride coating was produced on pure iron in two stages: boriding the iron surface at 950 °C for 6 h and then nitriding the pre-borided iron at 550 °C for 6h. The powder-pack technique was used in both stages. XRD measurements confirmed that the grown layers were nitrides and duplex borides. The produced diffusion of the layers reached 240 µm in depth as measured by SEM images. The measured microhardness across the case favoured the interphase cohesion between the iron nitrides and iron borides layers.Consequently, the multicomponent coating exhibited superior wear resistance to an applied normal load under dry sliding contact conditions in comparison to borided iron.

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Kinetic study of boron diffusion in the paste-boriding process

Cited by 131 publications

References 6 publications

Free Energy Problem for the Simulations of the Growth of Fe<SUB>2</SUB>B Phase Using Phase-Field Method

Free Energy Problem for the Simulations of the Growth of Fe<SUB>2</SUB>B Phase Using Phase-Field Method

Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

Boro-nitriding coating on pure iron by powder-pack boriding and nitriding processes

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