Properties and Growth Kinetics of the Boride Layer of a Boriding-Strengthened Fe-Based Powder Metallurgical Material

Fang, Hui; Zhang, G. S.; Xia, Liansen

doi:10.1007/s11223-021-00261-7

Cited by 3 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equation (26) coincides with Equation (7); this result implies the equivalence between both diffusion models. Table 2 shows different values of boron activation energies (the minimum boron energy value) in some steels [ 9 , 13 , 38 , 39 , 40 ] taken from the literature. The observed differences in the values of activation energies are related to various factors including the chemical compositions of steels, the nature of the boriding process, the selected boriding parameters, the approach used for the calculation, the physical state of the boron source, and the chemical reactions governing the supply of active boron.…”

Section: Discussionmentioning

confidence: 99%

“…Via this technique, it is feasible to adjust the duty cycle for a fixed current density to produce the Fe 2 B layer instead of a dual phase boride layer (FeB + Fe 2 B). The advantage of this boriding method over all the other processes [ 9 , 13 , 38 , 40 , 41 , 42 , 44 , 45 ] is the shortening of time duration to a few minutes. Therefore, the diminution of energy has a positive impact on the reduction of activation energy of this process (=39 kJ mol −1 ).…”

Section: Discussionmentioning

confidence: 99%

“…They found that the presence of Nd 2 O 3 oxide as a chemical catalyst accelerates the diffusivity rate of boron atoms (B) by reducing the required minimum boron energy value for the process by approximately 70%. Fang et al [ 40 ] used the pack-boriding for a synthetic powder metallurgy (PM) iron alloy containing 3 wt.% of carbon. The boriding agent used was composed of 10 wt.% B 4 C, 80 wt.% SiC, 5 wt.% KBF 4 , and 5 wt.% C to form the bilayer (FeB + Fe 2 B) with the occurrence of some porosity.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison and Analysis of Diffusion Models: Growth Kinetics of Diiron Boride Layers on ASTM A283 Steel

et al. 2022

View full text Add to dashboard Cite

Hard-coated surfacing of a few micrometers is widely applied to increase the efficiency of tools, e.g., for cutting, forming, and casting applications. Therefore, the base thermodiffusion surface treatment is a practical solution to these issues by hardening surface layers with interstitial elements such as carbon, nitrogen, and boron. In particular, within this study, the growth kinetics of an iron boride layer on ASTM 283 steel were investigated with two diffusion models of the powder-pack boriding technique in the temperature range of 1123–1273 K with different treatment periods. The first model, called the steady-state diffusion model, used the modified version of the mass balance equations at the Fe2B/substrate growth interface, the parabolic growth law, and the solution of Fick’s second law without time dependence. At the same time, the second diffusion model was based on Goodman’s method, also called the integral heat balance method. Afterward, the diffusion coefficient of boron in the Fe2B phase was calculated by fitting the experimental data to the models. Nevertheless, the estimated value for the activation energy of ASTM A238 steel in both diffusion models was coincident (168.2 kJ∙mol−1). A mathematical analysis was implemented by means of a power series (Taylor series) to explain this similarity. The SEM examinations showed a solid tendency to saw-tooth morphology at the growth interface with the formation of the Fe2B layer, whose presence was verified by XRD analysis. The tribological characterizations, including the tests of Rockwell-C indentation, pin-on-disc, and Vickers hardness test method, were used to analyze the antiwear features of the Fe2B layers. Finally, this value of energy was compared to the literature for its experimental validation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison and Analysis of Diffusion Models: Growth Kinetics of Diiron Boride Layers on ASTM A283 Steel

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The boronizing is a surface-hardening process used to harden the surfaces of ferrous alloys [1][2][3][4][5] and non-ferrous alloys [6][7][8][9][10][11][12] to get hard coatings on them. It is based on thermodiffusion of boron atoms through the surfaces of metallic substrates generally in the interval of 800-1050 • C for the holding times of 0.5-10 h [13].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Boron Diffusivities in Nickel Borides by Two Mathematical Approaches

Кеддам

Jurči

2022

Materials

View full text Add to dashboard Cite

In the work of this contribution, two kinetics models have been employed to assess the boron diffusivities in nickel borides in case of Inconel 718 alloy. The first approach, named the alternative diffusion model (ADM), used the modified version of mass conservation equations for a three-phase system whilst the second one employed the mean diffusion coefficient (MDC) method. The boron diffusivities in nickel borides were firstly evaluated in the interval of 1123 to 1223 K for an upper boron concentration of 11.654 wt% in Ni4B3. The boron activation energies in the three phases (Ni4B3, Ni2B and Ni3B) were secondly deduced by fitting the values of boron diffusivities with Arrhenius relations. Finally, these values of energy were compared with the results from the literature for their experimental validation.

show abstract

Diffusion Kinetics and Characterization of Fe2B Coatings Grown Thermochemically on Steel ASTM A709

Ortiz-Dominguez,

Keddam

2024

Met Sci Heat Treat

View full text Add to dashboard Cite

Properties and Growth Kinetics of the Boride Layer of a Boriding-Strengthened Fe-Based Powder Metallurgical Material

Cited by 3 publications

References 21 publications

Comparison and Analysis of Diffusion Models: Growth Kinetics of Diiron Boride Layers on ASTM A283 Steel

Comparison and Analysis of Diffusion Models: Growth Kinetics of Diiron Boride Layers on ASTM A283 Steel

Assessment of Boron Diffusivities in Nickel Borides by Two Mathematical Approaches

Diffusion Kinetics and Characterization of Fe2B Coatings Grown Thermochemically on Steel ASTM A709

Contact Info

Product

Resources

About